concrete VOLUME 55 ISSUE 4 AUGUST 2012 Concrete magazine Skills Maintenance Approved (1 point)
Concrete Futures Damage Resistant Design Using Concrete Systems
Residential Retro-Fit INTRODUCE CONCRETE’S MASS FOR COMFORTABLE HOMES
Concrete Tanks NZ Manufacturers Demonstrate Performance Excellence
THE MAGAZINE OF THE CEMENT AND CONCRETE ASSOCIATION OF NEW ZEALAND
UPFRONT
concrete MAGAZINE
With the first six months of 2012 well and truly behind us it is only now that the first signs of the Canterbury rebuild can be cautiously verified. Recent building consent figures for new homes and apartments indicate a 28% increase from June 2011 to June 2012. In the six months to June 2012 7,740 new homes and apartments had been consented, with Canterbury exhibiting high levels of growth within a general pattern of improvement nation-wide.
Editor/Advertising: Adam Leach +64 4 915 0383 adam@ccanz.org.nz Subscriptions: Kylie Henderson +64 4 499 8820 admin@ccanz.org.nz
With the residential construction market experiencing steady growth, the CCANZ Coming Home to Concrete campaign, which featured heavily in the previous issue of Concrete, will be maintained for another twelve months. Using film, print, radio and online media to convey the benefits of residential concrete construction the campaign will target the consumer looking to build, rebuild or renovate in the Canterbury region.
concrete is published quarterly by CCANZ (Cement & Concrete Association of New Zealand)
Within the commercial multi-storey space recent CCANZ activity has revolved around raising awareness of damage resistant design using concrete systems. Specifically, the Concrete Futures campaign (see pages 8-11) demonstrates how PREcast Seismic Structural Systems (PRESSS), base isolation and non-tearing joints (slotted beams) represent new approaches to structural design in seismically prone regions, approaches which embrace “building survivability”, not just “life safety”, to achieve low damage buildings for a more resilient built environment. Key to Concrete Futures is a series of short films featuring New Zealand case studies, such as the Southern Cross Endoscopy Building in Christchurch and Christchurch Women’s hospital, along with commentary from some of our leading structural engineers, to highlight how damage resistant design is an affordable option for the next generation of multi-storey buildings in New Zealand. The Concrete Futures campaign has already aligned with a successful damage resistant design seminar series throughout the main centres (see page 4), and will roll out a range of activities over the next twelve months to ensure influencers and decision makers within the building and construction industry, along with local and central government, are aware of what is rapidly becoming best practice in designing high-rise structures. Another exciting development here at CCANZ has been the recent appointment of Dr Joe Gamman to the newly created position of Education and Development Manager. Tasked with advancing CCANZ’s connections with tertiary institutions, investigating research openings for concrete, and establishing a more comprehensive understanding of market trends, Joe has already, in the short time since his arrival, become an important member of the CCANZ team. As the second half of 2012 gathers momentum, I anticipate no let-up in the pace of change across the building and construction sector. A key driver will undoubtedly be outcomes from the Canterbury earthquakes, with the recently released Christchurch Central Recovery Plan and the Canterbury Earthquakes Royal Commission’s Final Report (due 12 November) framing the second half of 2012.
PO Box 448 Level 6, 142 Featherston St Wellington NEW ZEALAND Tel: +64 4 499 8820 Fax: +64 4 499 7760. Email: admin@ccanz.org.nz Website: www.ccanz.org.nz ISSN: 1174-8540 ISSN: 1179-9374 (online) Disclaimer: The views expressed in concrete are not necessarily those of the Cement & Concrete Association of New Zealand. While the information contained in the magazine is printed in good faith, its contents are not intended to replace the services of professional consultants on particular projects. The Association accepts no legal responsibility of any kind for the correctness of the contents of this magazine, including advertisements. © Copyright 2012 CCANZ (Cement & Concrete Association of New Zealand)
Taking into consideration what will most likely be a watershed 12-month period, the 201213 CCANZ Business Plan has been drafted in consultation with key stakeholders groups. Maintaining continuity with recent years, while adapting to emerging circumstances, the Business Plan prioritises key strategic areas within which to protect and advance concrete interests. Through carrying out ‘business as usual’, along with successful project execution, CCANZ will once again seek to ensure that industry decision makers realise the full potential of concrete. Rob Gaimster CCANZ, CEO
2 concrete
||
volume 55 issue 4 AUGUST 2012
Cover photo: Southern Cross Endoscopy Building, Christchurch.
NEWS
NEWS NEW ROLE FILLED AT CCANZ Dr Joe Gamman has been appointed at CCANZ to the position of Education and Development Manager. Joe brings substantial scientific and commercial experience, focussing most recently on research management in both the university and commercial sectors. In his new role Joe will seek to develop Dr Joe Gamman closer relationships between the concrete industry and tertiary institutions, explore concrete research opportunities, and develop a broader understanding of market trends.
GOLDEN BAY CEMENT WINS EECA AWARD Gaining further recognition after having won the Excellence in Concrete for the Community at the 2011 CCANZ Concrete3 Sustainability Awards, Golden Bay Cement has again been hailed as an industry leader for its use of bioenergy to reduce CO2 emissions, winning the Renewable Energy category in the 2012 EECA Awards in the process. The company has cut CO2 emissions by a huge 58,000 tonnes per year and is saving $3m every year in energy costs, as a result of substituting nearly a third of the coal burned in its kiln for wood fuel, sourced from demolition and construction waste. The project makes Golden Bay Cement New Zealand’s largest known user of renewable wood energy outside the wood processing sector. Its CO2 savings are the highest of any award finalist except Supreme Award winner Air New Zealand, which is avoiding 142,000 tonnes of CO2 per year. EECA Chief Executive Mike Underhill said Golden Bay Cement was setting the bar for other energy-intensive industries. “It’s inspiring to see a big industrial user like Golden Bay Cement take a leap of faith and start switching to renewable bioenergy, particularly sourced from wood waste. It demonstrates very clearly that large process heat users don’t necessarily need to rely on fossil fuels. We hope this will be an example for other energyintensive industries like dairy. Industrial heat accounts for more than 30% of our national energy use - and along with transport, it has the most scope for improvement in terms of efficiency and increasing use of renewable energy.” The project has enabled Golden Bay Cement to meet the strict Environmental Choice criteria. It’s also helping Northland industry, generating jobs and revenue for local wood suppliers.
Energy Efficient Our Insulated Masonry System incorporates 40/60 or 80mm insulation board to concrete structures providing a complete thermal envelope. This System provides for the premium Rockcote flashing suite, and plaster coatings to provide a durable, low maintenance, and most importantly energy efficient structure now and into the future.
www.rockcote.co.nz 0800 50 70 40
volume 55 issue 4 AUGUST 2012
||
concrete 3
NEWS
DAMAGE RESISTANT DESIGN SEMINAR TIMELY AND WELL ATTENDED
Alistair Cattanach, Rob Gaimster, Stefano Pampanin, Andrew Charleson and Des Bull
Along with Precast NZ and Sika, CCANZ recently sponsored a nationwide New Zealand Concrete Society seminar series on the topic of low damage design. Under the heading Damage Resistant Design – Conceptual Design & Practical Implementation the half-day seminar, endorsed by the New Zealand Society of Earthquake Engineering (NZSEE) and the Society of Structural Engineers (SESOC), discussed motivations, issues and cost-effective engineering solutions to help design reinforced concrete buildings capable of sustaining low-levels of damage, and in turn limit business interruption after a moderate to severe seismic event. The presentations, listed to the right, were based on real New Zealand applications and extensive research / development of such building technologies, and incorporated conceptual design and detailing, including constructability and architectural aspects.
• Stefano Pampanin (University of Canterbury) - Revisiting Performance-Based Seismic Design: Issues and Solutions • Des Bull (Holmes Consulting) - Practical Aspects in Designing and Building a Low-Damage Seismic Resisting System • Alistair Cattanach (Dunning Thornton) - The Importance of Conceptual Design and Detailing: Three Completed Buildings • Andrew Charleson (Victoria University of Wellington) Architectural Implications and Control of Non-Structural Damage Those professional engineers and architects who attended the seminars were presented with copies of the CCANZ Concrete Futures DVD (featured on pages 8-11) which tours a number of New Zealand buildings to demonstrate the advantages of damage resistant design using concrete systems.
steel fibres for warehouse and industrial floors
For more information contact: Steve Skidmore 0800 60 60 20 sskidmore@maccaferri.co.nz www.maccaferri.co.nz
4 concrete
||
volume 55 issue 4 AUGUST 2012
When it comes to specifying concrete durability, waterproofing, and protection products, Xypex crystalline technology has no equivalent. Xypex Admix C Series is accepted by Auckland City Environments as compliant with NZ Building Code Clauses B2 and E2, and by Good Environmental Choice Australia as compliant with GECA 08-2007 Environmentally Innovative Products Standard.
Call 07 575 5410 or visit: www.demden.co.nz
Concrete solutions
Endorsed by:
29 & 30 October 2012, Amora Hotel, Wellington
Connecting bridge professionals with the latest updates, lessons and innovations Engage with leading experts from across the industry including: NZTA | KiwiRail | HERA | NZ Steel | Beca
• Seismic design and innovation • Investigation and construction • Policy and standards update • Asset management • Case studies and more With keynote presentation from Nigel Priestley, Professor Emeritus, University of California at San Diego
www.conferenz.co.nz/nzbridges CF097-ad.indd 1
30/07/12 3:55 PM volume 55 issue 4 AUGUST 2012
||
concrete 5
Sustainability Awards CCANZ is delighted to announce that the 2012 Concrete3 Sustainability Awards ARE now open for entries. The AwardS provide architects, designers, engineers and/or industry with the opportunity to submit a concrete based product, project or initiative, substantially completed within the past three years, that demonstrates sustainability in either the production or use of concrete. Previous winners have included The Pride, Lion Nathan’s new integrated manufacturing and warehousing facility in East Tamaki, which made extensive use of recycled glass as aggregate in concrete, and the Northern Gateway Toll Road, of which every aspect, from design through to operation, considered ways in which to contribute to New Zealand’s sustainable development. In 2010 the Fletcher Construction Company took home the Award for the Tauranga Harbour Link’s “Mix M”, while in 2011 Peddle Thorp Architects’ conversion of 21 Queen Street into a modern and vibrant office/retail complex received the highest honour. Sustainability embraces environmental, economic and social considerations. Each concrete based product, project or initiative entered may relate to any of the following areas: • Lean production less waste • Managing natural resources
Award categories The 2012 Concrete3 Sustainability Supreme Award winner will be selected from the following categories: • Excellence in Residential Concrete Construction • Excellence in Commercial Concrete Construction • Excellence in Civil Concrete Construction • Excellence in Concrete Innovation • Excellence in Concrete for the Community
How to enter & closing date For entry information and an entry form visit www.sustainableconcrete.org.nz. You have until Friday 31 August 2012 to submit your entry.
• Minimising energy use
Announcement of results
• Protecting against pollution
The winners will be announced at a presentation at the New Zealand Concrete Conference, October 2012. The December 2012 issue of Concrete magazine will include a detailed report on the award, based on the material submitted by the entrants. The winner of the Concrete3 Sustainability Supreme Award will be presented with the 2012 Concrete3 Sustainability Award trophy.
• Respect for people • Setting performance targets
How will entries be judged? Within each Award category entries will be judged by a panel of New Zealand and international industry experts, using an environmental, economic and social sustainability set of criteria. Extra credit will be given to unique factors and entries that cover more than one facet of sustainability (e.g. both environmental and social sustainability).
SPONSORED BY
6 concrete
||
volume 55 issue 4 AUGUST 2012
N E W F E AT U R E
products AND PRACTICE
Concrete’s new Products and Practice page provides manufacturers, agents and consultants with an alternative option to showcase the features and benefits of their goods and services. See pages 29-30 of this issue for the Concrete ratecard, and discover how to take advantage of the cost competitive opportunities offered through advertising in Concrete.
System protects costly polished concrete floors Costly polished concrete floors can now be protected from superficial damage during building activities by a system that has won several awards. Designed to give effective temporary protection to valuable, high quality floors of concrete, tile, marble, granite and timber, the system resists sand, dirt, plaster, spills, tools and machinery. Last year the system won the World of Concrete Most Innovative Product Award, in the USA. The Skudo system comprises a liquid coating over which is rolled a mat to form a convenient protective layer that will not move or bunch up, so workers cannot trip on it. When no longer needed, the whole layer peels off cleanly. There are versions designed to cope with light indoor traffic, medium traffic, and heavy outdoor traffic and weather. Sole New Zealand agents Demden Ltd can supply limited quantities ex-stock. Demden Ltd www.demden.co.nz
NEW COLOUR COLLECTION SAMPLE BOXES NOW AVAILABLE Featuring the Special Colour range and the new Premium Colour range, Peter Fell Ltd’s recently released Colour Collection samples box supersedes the existing three sample box-sets to more effectively showcase the rich range of colours available. The samples have themselves been made bigger, and are also arranged in a more accessible, less cluttered manner. Each sample can be easily removed from the case to allow for colour comparison. The samples are packaged in a compact and robust scrapbooking style case that fits comfortably on any office shelf, and which also protects the samples, keeping them safe and secure if you are out and about. Email cameron@peterfell.co.nz to receive your own Colour Collection, free! Peter Fell Ltd www.peterfell.co.nz
ROCKCOTE MULTISTOP Rockcote’s MultiStop range of premium construction mortars are designed for ease of use as sandable or non sandable patch, repair, and finishing plasters to achieve the best result over concrete substrates. Ideal for use as a skimming plaster to new or existing prepared concrete or other masonry substrates. • Easy transport and low mess for small jobs • Self contained • Patch, repair and finish in simple steps
• Easy to mix • Easy to use and apply • Good build up
For further information contact: Rockcote Ltd www.rockcote.co.nz or 0800 50 70 40
volume 55 issue 4 AUGUST 2012
||
concrete 7
ALAN MACDIARMID BUILDING, VICTORIA UNIVERSITY, WELLINGTON
CONCRETE FUTURES DAMAGE RESISTANT DESIGN Damage resistant design, also referred to as damage avoidance or damage control design, represents a new seismic design philosophy gaining acceptance amongst structural engineers the world over. Modern approaches to seismic design have generally emphasised ductile building behaviour during earthquakes that prevents building collapse and loss of life but at the expense of controlled damage. Following severe shaking this damage can potentially render the building beyond economic repair. The limitations of this approach are clearly evident in the aftermath of the 22 February 2012 earthquake. Christchurch experienced a seismic event of a severity even its modern buildings were not necessarily designed for, and which produced unprecedented soil liquefaction and lateral spreading. While moderately aged reinforced concrete and reinforced concrete masonry buildings generally suffered structural damage they did not collapse (with two tragic exceptions). However, for a considerable number the damage meant demolition was inevitable. Damage resistant design using concrete systems offers a means to design buildings that go beyond “life safety” to also allow for “building survivability”.
8 concrete
||
volume 55 issue 4 AUGUST 2012
Through the use of post-tensioned rocking walls or rocking column/beam joints in the form of PREcast Seismic Structural System (PRESSS) and the recently developed non-tearing joints (slotted beam) design, or elastomeric and sliding bearings in the form of base isolation, damage resistant design is an increasingly affordable option for structural engineers to create the next generation of New Zealand buildings. ALAN MACDIARMID BUILDING, VICTORIA UNIVERSITY, WELLINGTON Completed in 2010, long-term property owner Victoria University of Wellington selected PRESSS for this multi-storey building to ensure minimal structural damage and need for subsequent repair in the event of an earthquake, and to provide superior protection for its valuable scientific equipment. “Professionally its really important that we exhibit best practice all the time, and I believe this [damage resistant design] is becoming best practice.” Alistair Cattanach Dunning Thornton Consultants
SOUTHERN CROSS HOSPITAL ENDOSCOPY BUILDING, CHRISTCHURCH
CONCRETE
FUTURES
ON FILM PRECAST SEISMIC STRUCTURAL SYSTEM (PRESSS) Pushing earthquake engineering into new territory is a damage resistant design system based around concrete structural elements. Referred to as PRESSS, this seismic design solution was developed at the University of California in San Diego during the 1990s under the leadership of New Zealand structural engineer Nigel Priestley. Key to PRESSS is its use of un-bonded post tensioning cables within a precast wall, beam and column structure, which along with specially designed ductile joints, allow for a controlled rocking mechanism that returns the building to upright without significant structural damage, even after a major seismic event. Specifically, PRESSS reduces movements under small earthquakes through its pre-rocking stiffness, while for larger seismic events the yield action of its ductile joints combine with the un-bonded post tensioning cables to spring the building back to its original vertical position.
NT DESIGN DAMAGE RESISTA SYSTEMS E USING CONCRET
PRESSS offers enhanced performance during a seismic event and in turn minimal repair requirements, as well as being efficient and economical to construct through the use of precast concrete. SOUTHERN CROSS HOSPITAL ENDOSCOPY BUILDING, CHRISTCHURCH The theoretical principles of PRESSS performance during a seismic event were verified by the September 2010 and February 2011 Canterbury earthquakes, with this 5 storey medical facility emerging structurally unscathed and available for immediate reoccupation. “As we head towards the future in terms of rebuilding Christchurch we would like to think there would be a strong push towards more PRESSS technology buildings.” GARY HAVERLAND STRUCTEX
volume 55 issue 4 AUGUST 2012
||
concrete 9
CHRISTCHURCH WOMEN’S HOSPITAL
BASE ISOLATION Base isolator bearings were pioneered in New Zealand by Dr Bill Robinson during the 1970s, and have enjoyed widespread adoption as a damage resistant seismic design solution for new and retro-fitted concrete buildings. Base isolation works by separating (“isolating”) the structure from the ground, and therefore the lateral forces of an earthquake. There are two types of base isolation – elastomeric and sliding – both of which are designed to take the weight of the building and let the foundations move sideways during an earthquake. Flexible elastomeric bearings consist of layers of bonded rubber and steel with a central lead core. The lead core softens when under pressure absorbing energy that would otherwise be transferred to the building. With a sliding system there is no energy absorption, just deflection through the bearing. With both types of base isolation, building movement during an earthquake is greatly reduced, meaning less risk of damage or injury.
10 concrete
||
volume 55 issue 4 AUGUST 2012
Opened in 1982, the William Clayton building in Wellington uses about 80 lead rubber bearings, while Te Papa, opened in 1998, has 152 bearings. During the early 1990s the New Zealand House of Representatives, also in Wellington, was retro-fitted with 417 isolator bearings. CHRISTCHURCH WOMEN’S HOSPITAL This 10 storey base isolated building opened in 2005, and is a dedicated essential services facility, selected to provide on-going recovery facilities immediately following a major natural disaster. Testament to the base isolation system is that the hospital remained fully operational following both the September 2010 and February 2011 earthquakes. “We must keep pushing for the best technology in reinforced concrete design and construction, and the best concrete material amongst a growing number of options that reflect advances in engineering.” STEFANO PAMPANIN UNIVERSITY OF CANTERBURY
NON-TEARING JOINTS (SLOTTED BEAMS) research project university of chrIstchurch
Image: C. Muir, University of Canterbury
CONCRETE
FUTURES
NT DESIGN DAMAGE RESISTA SYSTEMS E USING CONCRET
NON-TEARING JOINTS (SLOTTED BEAMS) As part of the Future Building Programme, researchers at the University of Canterbury have developed an inexpensive detail, based on the original Japanese “slotted beam” concept, and in so doing have improved the way reinforced concrete buildings perform in earthquakes. Tests at the university on a 60-tonne, two-thirds scale model of the lower two storeys of a seven-storey reinforced concrete building have found that creating a slot about three-quarters of the way up a beam / column joint reduces damage to the building and increases performance during an earthquake. The slotted beam allows the building to flex and prevents the concrete beams from increasing in length, lessening damage to the frame and floors, and resulting in a much safer building. The technique is subtle, inexpensive and simple to incorporate into building designs.
It is anticipated that as an example of damage resistant design using concrete systems the “slotted beam” will be included in the New Zealand Concrete Structures Standard, and utilised in rebuilding Christchurch, as well as the retrofit of existing buildings.
“This form of system [non-tearing joints / slotted beams] or something like it is what we want to use to rebuild Christchurch.” DES BULL HOLMES CONSULTING
To request a copy of the CCANZ Concrete Futures DVD, and discover how “damage resistant design” using concrete systems can help to ensure a new multi-storey building stock that offers enhanced levels of safety and damage minimisation, email admin@ccanz.org.nz or call 04 499 7760.
volume 55 issue 4 AUGUST 2012
||
concrete 11
“Another important benefit rated highly by customers is that the visual impact of large-capacity tanks can be managed through their ability to be discreetly buried.� David Hepburn, Business Development Manager, Duracrete Ltd 12 concrete
||
volume 55 issue 4 AUGUST 2012
CONCRETE TANKS COMPETE STRONGLY ON PERFORMANCE BENEFITS Standing tall against the marketing tactics of their competitors, New Zealand’s precast concrete tank manufacturers point to important benefits in their latest range of products for domestic, agricultural and industrial applications. Specifiers and property owners are now able to choose modern concrete tanks from a selection of capacities and designs for storing, diverting and treating liquids ranging from potable water to commercial sewage. There are residential rainwater tanks, septic tanks, storage bunkers, effluent sumps and stone traps. Some tanks are designed to be completely buried, others to be surface standing. PERCEPTIONS Leading manufacturers are keen to address common misconceptions about concrete tanks. “Some customers initially think their cost is prohibitive,” says David Hepburn, business development manager at Duracrete Products, in Kamo. “But product-for-product the price difference with other types of tank is negligible, and customers get to enjoy all the benefits offered by concrete.” “Sometimes the cleanliness of concrete versus alternative materials is also queried,” he says. “However, concerns around water quality in concrete tanks are not as pressing as with other types of tanks, within which for instance natural rainwater can remain so acidic that it strips copper tubing, cylinders, wetbacks and brass fittings.”
“Another important benefit rated highly by customers is that the visual impact of large-capacity tanks can be managed through their ability to be discreetly buried,” adds Hepburn. “This is particularly important in the life-style block market.” Leigh Burford, managing director of Burford Concrete Tanks, in Winton, highlights the watertight characteristics of his industry’s product. “We manufacture our potable water tanks so that they self-heal,” he says. “A bonding agent is carefully applied between coats to ensure optimal water retention.” “While the weight of concrete tanks may pose some handling and positioning challenges during installation, we personally manage that process,” adds Burford. “It must be remembered however, that this weight makes the tanks very strong and stable. I’ve known other types of tank to flex in the wind so much that ballcocks won’t shut off and water is wasted.”
volume 55 issue 4 AUGUST 2012
||
concrete 13
Adrian Hynds, managing director of Hynds Pipe Systems, of East Tamaki, is also quick to point out the strength advantages of concrete tanks. “While people occasionally question the aesthetics of concrete tanks, they must keep in mind that when manufactured and installed correctly, some concrete tanks can be fully buried just below the surface,” he says. “The fact that concrete tanks are heavy gives them the benefit that they won’t blow over on exposed sites or wash away in a storm when they are empty.”
and increase strength and durability. Their tanks can come with an engineer’s Producer Statement that permits burying 900 mm below the surface. This is achieved through a specially-reinforced roof cast on the tanks at the factory. The alternative is a concrete dome roof fitted into a recess without sealants. Burford also offer customers a tank cleaning service, and suggest that rural customers maintain two concrete water tanks: one for drinking, the other in case of fire. The latter can be allowed to stagnate.
Hynds also notes that the insulating properties of concrete tanks enable them to maintain a cooler water temperature, which translates into health benefits.
Hynds make round and elliptical tanks to meet a civil engineer’s Water Tank Standard Specification. Their precast water tanks are built from a homogenous pour to maximise performance in holding water. Other models are built by the traditional plastered multi-layer method. All are water tested.
BENEFITS In basic terms, precast concrete tanks have a range of advantages: • The first-up cost is the last cost. • They can be sited strategically to divert flood flows. • No protection is needed from stock animals, and they resist wilful damage. • They are suited to earthquake zones as they ride with the seismic wave movements. • Cool water in concrete tanks does not promote algae growth. • They permanently retain the look of natural materials. • No expensive treatment is needed to lower the pH of rainwater to an optimum level. • They resist fire - though placement at least 3 metres from a building is recommended. • They offer the flexibility of surface or below-ground installation to suit specific requirements – allowing optimum use of valuable space. Leading manufacturers make their concrete tanks to NZS 3109:1997 Concrete Construction, and some are quality-certified to ISO 9001. To assist with the promotion of quality across material selection, design and production, a group of manufacturers established and help administer the New Zealand Concrete Tank Manufacturers’ Association. INNOVATION Advancements across the industry have recently been implemented. For instance, Burford, who have made concrete tanks since 1958, use internationally developed fibre reinforcing to minimise cracking,
Duracrete have made concrete tanks since 1965 and won the 2003 Concrete Technology Award for innovation. They have installed a special batching plant to give a very accurate 80 MPa mix and incorporate galvanised steel fibres to enhance strength. Their tanks have 65 mm thick walls and come with a 10-year warranty when new. Duracrete point out that while cast-in-situ tanks have merit where site access is poor, they should not be compared with hi-tech precast tanks made with accurate automated batching and self-compacting concrete. “European manufacturers favour selfcompacting concrete for its superior results and faster production,” says David Hepburn. “I understand that precast concrete tanks manufactured using methods such as ours offer many benefits from a whole-of-life perspective.” Duracrete recommend a floating outlet and provide for four positions around the top. An outlet boss and drain are provided at the bottom. Customers can paint the tanks using a straightforward system if they wish. CONCLUSION With strong manufacturing traditions developed over a 60 year period and sustained levels of innovation, combined with the inherent beneficial properties of their primary building material, concrete water tanks have an assured future. They remain a viable option for natural, clean and healthy water storage. “The Romans built aqueducts and other water retaining structures from similar natural resources to those found in modern concrete,” concludes David Hepburn, “and they are still functioning today, 2000 years later.” Text by Tom Evison, Technical Press Service
14 concrete
||
volume 55 issue 4 AUGUST 2012
“We designed moulds to pour the concrete flume in sections that could then be easily transported to Rotorua and slotted into place.” Trevor Barfoote, Managing Director, Barfoote Group
Kiwi ingenuity speeds up construction of Big Splash Construction of the concrete flume section of Rainbow Springs new Big Splash water ride broke all records thanks to the Barfoote Group, an innovative Northland based company. With 400 kilometres of road separating their Whangarei base and the construction site in Rotorua, the company decided to take an innovative approach to building the 431 metre concrete flume section of the ride. After being told by Swiss based ride design company Intamin, that the flume had to be poured on site as there was barely a couple of millimetres leeway allowable in the finished flume size, Kiwi ingenuity came to the fore. Barfoote Group, Managing Director Trevor Barfoote says, “We knew we could do it, so we designed moulds to pour the concrete flume
in sections that could then be easily transported to Rotorua and slotted into place. We poured the first one, put it on the back of the ute and drove to Rainbow Springs, and that’s how we won the contract.” Ever since then a steady flow of concrete flume sections arrived on site from Whangarei. This innovative method sped up construction of the ride eliminating the need to pour the concrete on site, which was a weather dependent job with the potential to delay a time critical project. Due to the success of pre-casting the flume Intamin is considering using this construction method for future rides it builds around the world. The nine-minute long Big Splash ride is a journey through time that will feature an informative narrative, state-of-the-art animation bringing to life dinosaurs, moa and the haast eagle, with an adrenalin boosting plunge at the end. Rainbow Springs Kiwi Wildlife Park, General Manager Michelle Caldwell says, “The ride is designed to inform park visitors, as well as entertain, and is a highly interactive experience. It will make people sit up and take a reflective look about how precious our environment is and the wildlife that inhabits it. Conservation is a key message.” Big Splash is a fitting addition to Rainbow Springs wildlife park, which has a strong conservation role as a tuatara breeder and New Zealand’s largest hatcher of brown kiwi chicks. The ride is expected to be a major draw-card for Rotorua, giving international and local visitors an exciting and unique insight into New Zealand history and culture.
volume 55 issue 4 AUGUST 2012
||
concrete 15
Peddle Thorp Architects Zurich House, 21 Queen Street, Auckland 2011 Supreme Winner
Fletcher Construction Company Tauranga Harbour Link Stage 2 2010 Supreme Winner
Entering its 5th year, the Concrete3 Sustainability Awards is an opportunity to show how your concrete-based product, project or initiative has contributed to New Zealand’s sustainable built environment. 16 concrete
||
volume 55 issue 4 AUGUST 2012
2012 Sustainability Awards Celebrating 5 Years of Excellence
Northern Gateway Alliance The Northern Gateway Toll Road 2009 Supreme Winner
Mainzeal Property & Construction/ Holcim (New Zealand) Limited Lion Nathan’s The Pride 2008 Supreme Winner
EntER now volume 55 issue 4 AUGUST 2012
||
concrete 17
CCANZ supported research demonstrates that when combined with enhanced insulation and draft exclusion, the retrofitting of New Zealand’s existing housing stock to take advantage of concrete’s thermal mass can help achieve energy savings and a more healthy living environment.
RESEARCH UPDATE
Thermal Mass Retrofit of New Zealand Dwellings Morten Gjerde – Senior Lecturer in the Victoria University School of Architecture
PREVIEWED IN THE MARCH 2012 ISSUE OF CONCRETE, AN INVESTIGATION OF HOW RETROFITTING THERMAL MASS INTO EXISTING NEW ZEALAND HOUSES MIGHT HELP IMPROVE ENERGY EFFICIENCY AND INDOOR THERMAL COMFORT WAS RECENTLY UNDERTAKEN BY VICTORIA UNIVERSITY’S MORTEN GJERDE, WITH THE HELP OF MASTER’S STUDENT JADEN CAIRNCROSS. Background The desktop study has generated a set of cases that can inform designers and homeowners of potential costs and benefits of retrofitting their lightweight timber-framed houses to include thermal mass. The study was jointly funded by CCANZ and Victoria University through the Summer Scholar Scheme, a programme that facilitates collaboration between the university and industry partners on research that is relevant to both. Indoor temperatures over 24°C in existing New Zealand dwellings are not common; however, conditions below 18°C are frequent. When the temperature falls below 16°C for sustained periods there is an increased risk of poor health for residents. With knowledge
18 concrete
||
volume 55 issue 4 AUGUST 2012
gained from previous research it was considered that thermal mass could be introduced in ways that could reduce the periods during which indoor temperatures fell below 16°C. In addition to investigating the potential benefits of concrete’s thermal mass, the project assessed performance of stored water and phase change materials embedded in plasterboard. Methodology The research reviewed literature on the characteristics of the existing New Zealand housing stock, how energy is used in New Zealand dwellings, passive solar design and material technologies to inform the design of appropriate interventions. Six distinct typologies of timber framed housing were defined,
Villa
Bungalow
State House
Pre-Insulation
Post-Insulation
Recent Housing
linked mainly to the periods in which each was most popular. Examples of each typology were identified within the Wellington region which enabled the research team to source original drawings of the construction from the City Archives. On the basis of this information computer models were developed for testing. The house types were modelled in CAD software and using the thermal simulation programme IES VE. The software was kindly provided by the developer, who have recently adapted it to New Zealand conditions on behalf of CCANZ. Different combinations of thermal mass retrofits were assigned to each house typology on a speculative basis. The modifications were investigated to identify the level of improvements in living room temperatures that could be expected for a whole calendar year. Variations using heat pumps were also investigated to simulate potential energy savings. The investigation produced data for 72 different scenarios. results Results were grouped by location to produce comparable figures for maximum, minimum and average temperatures. Changes in the hours indoor temperatures fell within thermal comfort bands before and after making the retrofits would suggest how much more comfortable a dwelling would be and could be linked to potential health benefits through other research. Energy use and cost of applied heating were investigated as part of the overall cost-benefit analysis. General trends indicated that thermal mass retrofits are more effective in older houses, with more recent dwellings generating little improvement on average annual living room temperatures.
This is most likely a consequence of the higher insulation levels found in more recent dwellings as well as improved construction techniques that lead to lower infiltration rates. Despite the small improvements, considerable reductions (between 2.0°C and 4.3°C) in the maximum temperature experienced in the living rooms of dwellings is seen with a 2.0°C to 4.8°C increase in the minimum temperature in the Auckland climate. Some unexpected results were also found. One such result reveals that thermal mass retrofits can cause reductions in average indoor temperatures, particularly when heat pumps are utilised with a thermostatic setting preventing room temperatures falling below 18°C. This was found to occur more often in post-1978 housing, the point at which minimum insulation requirements were introduced. Conclusions These results conclude that while thermal mass is an integral part of passive solar design, insulation is more important in those dwellings where appropriate areas of glazing are not available to heat the mass. Furthermore, the results indicate that savings and improved internal conditions are possible through purely passive retrofits, but significant improvements require efficient heating devices to improve minimum conditions to healthy levels which are most important in older houses located in cold climates. Overall, retrofitting of thermal mass into an existing lightweight dwelling should be considered within an overall strategy that also includes insulation improvements, draft-stopping and higher efficiencies of heating appliances.
volume 55 issue 4 AUGUST 2012
||
concrete 19
CONCRETE AND RECYCLED MATERIALS: GROWING ACCEPTANCE The use of recycled materials has become accepted throughout the ready mixed concrete industry in response to an increasing environmental focus and the growing cost of disposing of waste material. To assist with the continuation of this trend CCANZ has released Technical Report 14: Best Practice Guide for the Use of Recycled Aggregates and Materials in New Concrete – a resource for optimising the performance and engineering properties of recycled aggregate in concrete.
concrete aggregate), or from leftover fresh concrete which is purposefully left to harden (leftover concrete aggregate).
BACKGROUND
In addition, waste materials such as crushed glass can be used as secondary aggregates in concrete.
Concrete is the most widely used construction material on earth, with an estimated 25 billion tonnes manufactured each year. As such, issues have arisen around the management of waste concrete. In New Zealand 27% of the total waste generated is construction and demolition waste, and of this, concrete represents 25%, i.e. 7% of the total waste generated. The development of recycling schemes, and in turn the use of recycled aggregate in concrete, has been given impetus by the increasing scarcity of landfill sites and the recent introduction of a $10 per tonne landfill levy.
Alternatively, the aggregate from fresh concrete, which is leftover or surplus to requirements, can be recovered for reuse in concrete manufacture (recovered concrete aggregate).
All these processes avoid dumping to landfill whilst conserving natural aggregate resources. BENEFITS OF RECYCLING CONCRETE Recycling or recovering concrete materials has two main advantages - it conserves the use of natural aggregate and the associated environmental costs of exploitation and transportation, and it preserves the use of landfill for materials which cannot be recycled.
RECYCLED CONCRETE OPTIONS
While crushed concrete can be used as a sub-base material for pavements and civil engineering projects, it can also be used as a higher grade resource, such as aggregate in new concrete.
The reuse of hardened concrete as aggregate is a proven technology. It can be crushed and reused as a partial replacement for natural aggregate in new concrete.
The Nest, Wellington Zoo’s recently opened animal hospital, is one example where recycled concrete aggregate has been used in structural concrete.
Hardened concrete aggregate can be sourced either from the demolition of concrete structures at the end of their life (recycled
Schemes such as Green Star New Zealand recognise construction and demolition waste reuse and provide credits accordingly.
20 concrete
||
volume 55 issue 4 AUGUST 2012
GLOBAL AWARENESS Extensive investigations have been carried out in the UK, North America and across Europe on the use of recycled aggregate in concrete. Globally the concrete construction industry has taken a responsible attitude to ensuring its natural resources are not overexploited. In some cases the preservation of dwindling natural aggregate sources is a significant issue driving the use of recycled aggregates. Reducing the financial and environmental impact of aggregate cartage is also a factor. Using portable aggregate plant, material can be processed onsite during demolition and then reused on the same site during construction. This is a better option than transporting natural aggregates from distant quarries. Landfill levies, waste dumping taxes and imported aggregate taxes have also made recycled concrete a viable option overseas. This has predominantly taken the form of ‘low-grade’ road-base material, however the UK, Belgium, Switzerland, Germany and the Netherlands regularly use recycled aggregate in new concrete. DEVELOPING A MARKET The key to recycling is to achieve a balance between economic pressures and ecologically sound practices. Several market constraints and technical challenges exist when developing markets for secondary products. These include consumer uncertainty about the quality and consistency of products. In addition, there can be a lack of practical performance and engineering data on recycled materials. Developing and adopting performance requirements specifically for secondary and recycled products will promote their specification, and also ensure that externally verified quality certification and compliance systems are adopted.
TH
1987 - 20 12
Concrete Solutions Our Rockcote’s MultiStop range of premium construction mortars are designed for ease of use as sandable or non sandable patch, repair, & finishing plasters to achieve the best result over concrete substrates.
CCANZ TECHNicAL REPORT To this end, CCANZ in partnership with BRANZ and supported by the Aggregate & Quarry Association of New Zealand (AQA) has written Technical Report 14. TR 14 outlines the processes involved in the use of recycled materials as aggregate in concrete and the effects of these materials on the fresh and hardened properties of concrete made from them. It is intended to act as a resource to optimise the practical performance and engineering properties of recycled and secondary waste materials as aggregate in concrete supplied in accordance with NZS 3104:2003 Specification for Concrete Production, as well as act as the basis for future revisions of NZS 3104 and NZS 3121 Specification for Water and Aggregate for Concrete to potentially incorporate recycled materials.
Always Start with a Better Finish
TR 14 is also designed to raise awareness of the need for concrete recycling in New Zealand, and presents technical guidelines to specifiers, contractors, aggregate suppliers, and concrete manufacturers on the use of recycled aggregate in concrete, and on the recovery of concrete aggregate and fines from left over fresh concrete. By providing a general overview of recycled concrete in construction, TR 14 will also be of interest to regulatory bodies offering information on the suitability of recycled material for use in construction projects.
www.rockcote.co.nz 0800 50 70 40
A copy of TR 14 is available for download from www.ccanz.org.nz volume 55 issue 4 AUGUST 2012
||
concrete 21
PREFAB CONCRETE HOME INNOVATIVE DEVELOPMENT WORK PIONEERED BY FALCON CONSTRUCTION AND ALLIED CONCRETE IN THEIR PREFABRICATED CONCRETE CUBE HOUSE HAS PAID OFF JUDGING BY THE LEVELS OF PUBLIC INTEREST AND ENTHUSIASM AT THE HIVE home innovation village. Built on site in five weeks without a hitch from start to finish, the first CUBE show home went on display to the public in Christchurch on 21 April. Around two thousand visitors, including many quake-hit Cantabrians and some from overseas, looked through the first weekend. David Reid, director of Falcon Construction, outlines the opportunities presented by the HIVE initiative. “We were invited by Prefab NZ to showcase our CUBE construction method at the HIVE, located at the Canterbury Agricultural Park (Curletts Road entrance) in Christchurch. It was an excellent chance to educate people not only on our prefab building methods but also on the benefits of building with concrete.” Billed as an incubator for prefab innovation, Prefab NZ has focused the HIVE on residential construction, though the organisation’s interests also cover commercial and industrial construction. A non-profit, Prefab NZ has well over 200 members, and the HIVE drew 25 partners including Christchurch City Council, Meridian Energy, Winstone Wallboards and Resene. Using precast, steel reinforced, concrete walls, the CUBE was one of the first four homes built at the HIVE. When the remaining six are completed by the end of this year, the CUBE will be the only one featuring concrete modules with compressed timber infill walls. 22 concrete
||
volume 55 issue 4 AUGUST 2012
MODERN AESTHETICS CEO of Prefab NZ, Pamela Bell, says the public has responded positively to the CUBE. “It’s very good looking with modern aesthetics. It’s also the most conventional and easy to understand. According to many visitors to the HIVE it looks right and feels most like a home,” she says. David Reid agrees. “Looking back to the opening day crowd and the five hundred visitors per week we’ve had ever since, people have been intrigued by concrete construction and pleasantly surprised at how architectural a prefab concrete home can look. We’ve also received an overwhelming amount of positive feedback on our floor plan,” he says. The structure of the CUBE allows support for a decking or balcony on each section. “This is what we call our CUBE face. Essentially it’s our strong aesthetic design signature,” explains Reid. Partnering with Falcon Construction in the development of the CUBE was a straight forward choice explains Allied Concrete’s national sales manager Glen Paterson. “We’re a national player in ready mixed concrete, and we needed a marketing partner to get us into concrete housing and meet the growing demand for it.”
DRAWS BIG CROWDS “We saw the demand for concrete cladding stem from the leaky home disaster, and besides, concrete is now well recognised for its thermal benefits,” he says. “The modular CUBE design brings concrete down from the high end to the mid-price range. It also has the great benefit of fastbuild to meet the social needs of Christchurch – and it’s easily re-locatable if required,” adds Paterson. Adjacent modules have a weathertight vapour barrier between them achieved by installing a PEF backing rod which is then sealed with silicon. POPULAR PEBBLE FLOOR According to Paterson, one of the most talked-about features of the CUBE home at the HIVE is its polished concrete floor with an exposed Hyland River pebble mix throughout the kitchen and living areas. The floors were all poured by Lanyon & Le Compte, who also precast all the panels. The CUBE design has already been used for commercial premises in Christchurch, and there are plans for multi-storey construction, with retail at street level and apartments above. The CUBE is also ideally suited to meet the Department of Building and Housing’s interest in promoting social housing developments nationwide. David Reid says Ngai Tahu Properties have taken CUBE buildings as sales offices on three subdivisions: Wigram, Lincoln and Prestons Road. “They saw value in quick, strong and aesthetically
pleasing construction that allows for later transportation to each new stage of each subdivision,” he says. “The CUBE “Rakaia” design at the HIVE is complemented by many alternative designs from single to multi-level to suit the vision and preferences of clients,” says Reid. Pamela Bell reports interest from other regions, including Auckland, in sharing the HIVE experience. All featured designs combine prefab technology with high quality, sustainability, safety, rapid build and affordability. The slogan for the CUBE is “Structure the Future”, a sentiment that resonates deeply with David Reid. “We can design and build the modular prefabricated CUBE system for homes and other buildings of all sizes with minimal limitations. Concrete is the future of building in Canterbury, and now we are starting to see insurance companies release both remedial and rebuild work – which is great”. Text by Tom Evison, Technical Press Service
“The modular CUBE design brings concrete down from the high end to the mid-price range. It also has the great benefit of fast-build to meet the social needs of Christchurch – and it’s easily re-locatable if required.” Glen Paterson, National Sales Manager, Allied Concrete
volume 55 issue 4 AUGUST 2012
||
concrete 23
New Firth EcoPave system offers environmental edge Firth HAS launched a new improved permeable paver system, Firth EcoPave, in response to calls from local government for more of these eco-friendly systems to be used. Permeable pavements, roads and driveways are an alternative to traditional pavers, tarseal and concrete. They are beneficial to the environment because storm water is able to permeate the paver (or its surrounds) which can significantly reduce peak water flow during storms. Storm water run-off from traditional pavers and driveways can cause storm water systems to be overloaded in heavy downpours and pollute surrounding local waterway catchments. This is because storm water contains pollutants such as chemicals, fertilisers, sediment and oils, destroying the quality of water flowing into waterways. Firth has been researching and developing how to improve its permeable paving system for the past five years. Sales Engineer for Firth Auckland’s Masonry Division, Steve Crossland says, “When storm water pours down roadways it picks up copper and other contaminants which are extremely detrimental to aquatic life in a streams, rivers, beaches and harbours.” “Firth has developed its new EcoPave system in response to calls from local authorities to increase usage of permeable pavers as storm water run-off is a huge problem for councils around the country,” he says. “The system is more effective because of the sub-base support layer, made of either drainage aggregate or no fines concrete from Firth’s Enviro range, rather than the normal GAP types of aggregate.” Firth EcoPave has the potential to filter out some contaminants and releases cleaner run-off into the storm water system. Water that permeates the pavers is also released at a slower rate helping to prevent storm water systems overloading; and during periods of heavy rainfall in hot weather, warm water is retained longer in the system to enable it to cool rather than being released directly into catchment areas and impacting plant and aquatic life. “We wanted to take a more active involvement in what goes underneath the pavers and to create tighter controls around the way permeable paving systems are laid,” says Crossland. “To support the launch of the new Firth EcoPave system our website now offers a paving calculator and is able to provide contractors with good practice on how to install the system,” he says. The permeable pavers used in the system are available in two colours: either black or natural and fall into two types – porous or standard. The porous pavers absorb the water, whereas the standard pavers are laid with an enlarged gap around the paver and the water permeates the joints. The permeable pavers are currently available in 50, 60 and 80 mm thickness. Among their wide ranging uses, permeable pavers can be used for driveways, patios, footpaths, car parks, and cycle ways. They are also suitable for low traffic use such as car parks, access roads to townhouse developments and other low traffic commercial situations. Permeable paving systems also offer additional benefits; they are exempt from local authority definitions for impermeable surfaces which allow building size to be maximized within impermeable surface site restrictions. Permeable pavers can also play a part in reducing developers’ requirements for a sediment dams due to the pavers’ filtering properties.
24 concrete
||
volume 55 issue 4 AUGUST 2012
“Firth has developed its new EcoPave system in response to calls from local authorities to increase usage of permeable pavers as storm water run-off is a huge problem for councils around the country.� Steve Crossland, Sales Engineer - Masonry Division, Firth Industries
volume 55 issue 4 AUGUST 2012
||
concrete 25
Image. PCA
concrete testing basics – part 1
A simple method for determining the free moisture content of aggregates The importance of correct concrete testing cannot be overstated. In conjunction with individual New Zealand Standards it provides a safeguard for the final performance of concrete, that equally applies to residential construction as it does high-rise construction or bridges. Over the NEXT few issues Concrete magazine will feature selected concrete test methods to act as either an introduction or a refresher to this crucial area of operation.
26 concrete
||
volume 55 issue 4 AUGUST 2012
concrete testing basics – part 1
The moisture content of both coarse and fine aggregates used in concrete production is required to be known not only for control during batching but also when estimating the total batch water. The value that is used usually expresses the moisture content as a percentage by weight of the material in its saturated surface dry condition. Various methods are available to determine this amount of moisture. These methods will give either the free surface moisture in the material or the free plus total absorbed water, or a value somewhere in between these conditions. Some methods compare the weight loss before and after drying of a sample and may require a value for absorption to be known. When analysing concrete mixes the value for only the free surface moisture in aggregates is often all that is required. A simple method for measuring this free surface moisture content is described. For this method the specific gravity at the saturated surface dry condition must be accurately known. The method, and variations of it, has been described in the US Bureau of Reclamation’s Concrete Manual and in past reports published by the Cement and Concrete Association (UK).
3. Carefully shake and rotate the material within the measuring cylinder to remove any entrapped air bubbles and to wash all the sand into the water. 4. When the air bubbles are removed, carefully read the final water level. The moisture content of the material as a percentage of its saturated dry weight is determined from the following equation: = L-M/SG X 100% M-L L = difference in water levels in ml M = sample mass in grams SG = specific gravity at saturated surface dry condition. This equation can be modified, if required, to give the moisture content of the material as a percentage of its moist weight. 5. As, in the form shown above, the test has only two variables, reference can be made instead to a simple graph of final water level versus moisture content. Using the final level of the water in the measuring cylinder the moisture content of the same can be determined directly from the graph.
The method is based upon the displacement of water in a container by a known weight of the material under test. The container is usually a measuring cylinder showing divisions at 10 ml or 20 ml intervals. The measuring cylinder can be of any capacity but often one of 1000 ml is used.
The water levels in the measuring cylinder must be carefully read, as in the above examples a misreading of ± 10 ml will result in an error of ±1%. A similar error will occur if the mass of the sample is incorrectly weighed by ±20g.
The basic formula that gives the moisture content, utilises the initial and final levels of the water in the measuring cylinder, the mass of the moist sample that was tested, and the specific gravity of the material in its saturated surface dry condition.
To overcome these errors· refinements to the method can be made. The initial water can be weighed. After adding the sample of aggregate, extra water can be used to raise the water level to a known position on the measuring cylinder, such as its lip, and this can also be weighed.
The following description is based upon the use of a 1000 ml measuring cylinder. 1. Place 400 ml of water at room temperature into the measuring cylinder. 2. Weigh 1000 gm from a representative sample of the material to be tested and place it into the 400 ml of water. The level of the water will rise up the measuring cylinder.
Scales, that can be reset back to zero, and programmable pocket calculators are convenient devices that can assist with the calculations. The value that is obtained may not be exact but it is obtained quickly, and provides a reliable indication of the free moisture content.
volume 55 issue 4 AUGUST 2012
||
concrete 27
CCANZ Library Listed below is a small selection of recently acquired material by the CCANZ library. email library@ccanz.org.nz TO BORROW. CONCRETE PIPE DESIGN MANUAL BY AMERICAN CONCRETE PIPE ASSOCIATION Engineers responsible for the design and specification of precast concrete pipe drainage systems have relied on the Design Manual for many decades. It has been continually updated to provide current technical data and design aides needed in preparing efficient and cost-effective drainage solutions for sanitary sewer, storm drain and culvert applications. In addition to the tables and figures, the Design Manual now includes information on the new beddings for concrete pipe based on today’s methods of installation. This information provides engineers with the versatility to tailor any individual project to suit specific site conditions.
Designing Comfortable Homes
SELF CONSOLIDATING CONCRETE: APPLYING WHAT WE KNOW BY JOE DACZKO Self-consolidating, or self-compacting, concrete (SCC) uses a superplasticiser and a stabilizer to increase the ease and rate of flow, and in turn eliminate the need for vibration. Based on an understanding of SCC features and benefits, as well as the application variables of the technology, uptake has been swift in some segments of the concrete industry. This book presents a foundation for consistently producing and applying SCC in a production environment, and should be useful for both the new practitioner as well as those already familiar with SCC.
Using an appropriate combination of glass, thermal mass and insulation, New Zealand homes can be naturally warm in winter and cool in summer. Designing Comfortable Homes provides all the concrete answers to how passive solar design can enhance thermal comfort and reduce energy demands.
Library Quiz To go in the draw to win a copy of Self Consolidating Concrete: Applying What We Know by Joe Daczko answer the following simple question: Entries are now open for the 2012 CCANZ Concrete3 Sustainability Awards. What entry took home the Supreme Award in 2011? Email your answer to library@ccanz.org.nz. Entries close Friday 7 September 2012. Congratulations to Tiffany Lester of Opus International Consultants, who correctly answered the March 2012 Library Quiz to receive a copy of The Concrete House: Building Solid, Safe and Efficient With Insulating Concrete Forms by Pieter A. VanderWerf.
Request your FREE copy of Designing Comfortable Homes now
COMING HOME TO CONCRETE
www.ccanz.org.nz
Cement & Concrete Association of New Zealand
28 concrete
||
volume 55 issue 4 AUGUST 2012
concrete JOURNAL OF THE CEMENT & CONCRETE ASSOCIATION OF NEW ZEALAND (CCANZ)
2012–2013 Rate Card
IN CIRCULATION SINCE 1957, CONCRETE IS THE QUARTERLY INFORMATION SOURCE THAT PROVIDES SOLUTIONS AND INSPIRATION FOR A WIDE CROSS SECTION OF BUILDING PROFESSIONALS. Architects, engineers, builders and those in the concrete sector turn to Concrete for practical, technical and design information on how to maximise the potential of the world’s most widely used construction material. Drawing on the in-house resources of CCANZ along with expertise from within New Zealand and overseas, Concrete presents news and information on a diverse range of topics, including residential and commercial concrete systems, domestic and international projects, as well as regulatory developments. To reach the key decision makers within the building and construction industry consider the cost competitive opportunities offered through advertising in Concrete.
CIRCULATION ANALYSIS The total circulation of around 5,000 represents a targeted group of influencers within the building and construction industry. Circulation analysis reveals a percentage breakdown as follows: Architecture
34%
Engineering
31%
Building
20%
Cement & Concrete
9%
Government / Local Authorities
5%
Education Institutions
1%
ADVERTISEMENT SIZES Double page spread
Type Area 252mm H x 370mm W
Trim Size
297mm H x 420mm W
Bleed Size 303mm H x 426mm W
Full page
Type Area 252mm H x 170mm W
Trim Size
297mm H x 210mm W
Bleed Size 303mm H x 216mm W
Half page spread
Type Area 126mm H x 380mm W
Half page
Type Area 252mm H x 83mm W
Type Area 126mm H x 175mm W
Third page
Type Area 252mm H x 52mm W
Type Area 84mm H x 175mm W
Quarter page
Type Area 126mm H x 83mm W
ADVERTISEMENT RATES (EXCL GST) Advertisement size
4 colour casual
4 colour, 4 issue over 12 months
Double page spread
$3,000
$2,700
Full page
$1,500
$1,350
Half page spread
$1,500
$1,350
Half page
$1,000
$900
Third page
$700
$630
Quarter page
$500
$450
PUBLICATION DATES AND DEADLINES Publication dates
Booking deadlines
Complete material deadlines
Issue 1 – September 28, 2012
Noon, Friday 7 September
5pm Friday, 14 September
Issue 2 – December 7, 2012
Noon, Friday 2 November
5pm Friday, 16 November
Issue 3 – March 29, 2013
Noon, Friday 1 February
5pm Friday, 15 March
Issue 4 – June 28, 2013
Noon, Friday 31 May
5pm Friday, 14 June
ARTWORK SPECIFICATION All artwork to be supplied as high resolution pdf to the exact size of the advertisement booked. Minimum resolution for images is 300ppi and in cmyk. Double page spread and full page advertisements must include trim marks and a minimum of 3mm bleed.
PRODUCTS AND PRACTICE Those companies that place an advertisement in Concrete can also take advantage of the Products and Practice section, which provides a quarter page in which to describe the features and benefits of a product or service, alongside an image and website address. See page 7 of this issue. For further details please contact: Adam Leach Information & Communications Manager Level 6 / 142 Featherston Street PO Box 448 Wellington 6140 NEW ZEALAND
D +64 4 915 0383 F +64 4 499 7760 E adam@ccanz.org.nz
T +64 4 499 8820 M 027 5355 144 W www.ccanz.org.nz
$400 (Excl. GST)
CONTACTS New Zealand Ready Mixed Concrete Association Ph (04) 499 0041 Fax (04) 499 7760 Executive Officer: Rob Gaimster President: Jeff Burgess www.nzrmca.org.nz New Zealand Concrete Masonry Association Ph (04) 499 8820 Fax (04) 499 7760 Executive Officer: David Barnard President: Jason Savage www.nzcma.org.nz Precast NZ Inc. Ph (09) 638 9416 Fax (09) 638 9407 Email: ross.cato_precastnz@xtra.co.nz Executive Officer: Ross Cato President: Andrew Sinclair www.precastnz.org.nz New Zealand Concrete Society Ph (09) 536 5410 Fax (09) 536 5442 Email: concrete@bluepacificevents.com Secretary/Manager: Allan Bluett President: Jason Ingham www.concretesociety.org.nz New Zealand Master Concrete Placers Association Ph (06) 873 4428 Fax (06) 873 4429 Email: office@mcpa.org.nz www.mcpa.org.nz
News from the Associations NEW ZEALAND CONCRETE SOCIETY (NZCS) Conference Keynote Speaker for October Conference Announced The main keynote speaker at Concrete Conference 2012 will present a paper on The Shard, a tower being built in London which is set to become Europe’s tallest building. The industry conference is to be held from 11-13 October at the Claudelands Conference and Exhibition Centre in Hamilton. Chris Cable, a graduate of the University of Canterbury, is an Associate within the Exallos Group of the Robert Bird Group. The Exallos Group provided engineering consultancy services for The Shard, a 310m tower situated above London Bridge Station which will have a mixed use of commercial, hotel and residential space. It is being developed by Sellar Property Group and constructed by Mace. Among the site’s constraints were: a 25-storey existing RC tower, London Bridge Railway Station, underground tube lines, brittle masonry arches, underground services, and a single access route. Demolition of the existing structure and the potential for archaeology posed a risk of delay, hence a jump-start construction sequence was developed, whereby the basement was built in a top-down fashion while the core and steel structure was built off plunge columns above. This saved about four months and won the Institution of Civil Engineers Awards in 2010. The basement construction involved the UK’s largest single concrete pour while the superstructure posed challenges: appropriate cranage that could service the site and cope with the fast-track steel erection scheme and the tapering facades; an appropriate edge protection screen system to accommodate the tapering façade; replacement of the London Bridge Station concourse roof; and slipforming the core to 240m. Chris will discuss the development and the structural design, focusing on the construction challenges and solutions. To learn more (and be impressed) visit: http://the-shard.com Chris Cable – A Short Bio Having worked for the Exallos Group of Robert Bird Group, which provides specialist engineering consulting services, since 2008, Chris became London office team leader in 2010. As well as leading The Shard team for Exallos Group, Chris has led teams that worked on London Bridge Place, the Emirates Airline (AKA the London 2012 cable car), the 100 Bishopsgate development, and the Pinnacle. After graduating from the University of Canterbury in 2003 with a BE (Hons) in Civil Engineering, he worked with Connell Wagner in Christchurch before serving in the NZ Army Regular Force where he spent 14 months in the Engineering Office in Egypt. As a student, Chris was President of the University of Canterbury Engineering Society (ENSOC). Currently he and his family are based in Western Australia where he is developing the Exallos presence in the construction and resources sectors. For more information or to register for the 2012 conference visit www.theconcreteconference.com. Please note there is no hardcopy brochure this year, all registrations are via the website.
volume 55 issue 4 AUGUST 2012
||
concrete 31