concrete VOLUME 57 ISSUE 1
readinG concrete can contribute to your skills maintenance
Concrete3 Sustainability Awards REDEVELOPMENT OF HURSTMERE GREEN TAKEs 2013 TOP HONOUR
Penetrations in Suspended Slabs CCANZ OFFERS BEST PRACTICE ADVICE IN THIS IMPORTANT AREA
CCANZ CEO Recognised rob gaimster elected ICT honorary fellow
THE MAGAZINE OF THE CEMENT AND CONCRETE ASSOCIATION OF NEW ZEALAND
UPFRONT
concrete MAGAZINE
As the end of 2013 rapidly approaches the time to pause and reflect on the past 12 months is difficult to come by. However, this column is an opportunity to look back on achievements and contemplate the value CCANZ has provided its stakeholders.
Editor/Advertising: Adam Leach +64 4 915 0383 adam@ccanz.org.nz
In 2012-13 and 2013-14 CCANZ maintained a consistent work programme across all areas of strategic concern - see page 3 for Annual Report summary.
Subscriptions: Angelique Van Schaik
The promotion of Competitive (Concrete) Construction Systems continues to focus on damage resistant design. Under our Concrete Futures banner, the Base Isolation 101 and 201 seminars have been enthusiastically received during 2013.
+64 4 499 8820
CCANZ remains committed to investing resource in the area of Education, Training and Research. The 2013 ArchEng workshop and the development of a skills maintenance website (see pages 6 & 7) are two recent examples of how CCANZ is operating in this space.
by CCANZ (Cement & Concrete
The Concrete3 Sustainability Awards (see pages 14-21) is the vehicle for CCANZ to demonstrate concrete’s sustainability credentials. The winners in both the 2012 and 2013 Awards have included some of New Zealand’s foremost new construction projects.
PO Box 448
Monitoring the Legislative and Regulatory Environment continues to be a vital area of CCANZ activity. In addition to the Canterbury Earthquakes Royal Commission and numerous NZ Standards, CCANZ has represented the concrete industry view in response to MBIE’s many discussion documents.
NEW ZEALAND
Growth is always a priority, with CCANZ focussing efforts around the Canterbury rebuild, the Roads of National Significance and Auckland’s residential expansion. In terms of the latter, I was recently given the opportunity to express my views in the BRANZ Build magazine, and they are worth repeating here in summary.
Email: admin@ccanz.org.nz
admin@ccanz.org.nz concrete is published quarterly
Influenced by changing demographics, sky-rocketing property prices, scarcity of land for development and the relatively slow rate of residential construction, New Zealand must embrace inner-city living, and in turn commit to building quality apartment complexes that don’t compromise on appropriate materials. To assist, CCANZ recently developed the Apartment Design Guide, which sets out key considerations for designing New Zealand apartment buildings, their amenities and shared spaces. Also included are recommended minimum sizes, daylight and interior climate requirements, effective soundproofing and fire protection. Interest in the Guide has been encouraging, but beyond the number of copies distributed or downloaded how does CCANZ measure the value it has generated for stakeholders? This is a question that applies to all CCANZ activities throughout 2013. It has always been a problem to assign a value to organisations, such as CCANZ, that produce outcomes of common good. While the investment from individual stakeholders is easily assessed, the majority of the value generated lies beyond the balance sheet and is problematic to quantify.
Association of New Zealand)
Level 6, 142 Featherston St Wellington
Tel: +64 4 499 8820 Fax: +64 4 499 7760. 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 2013 CCANZ (Cement & Concrete Association of New Zealand)
Typical financial calculations such as Return on Investment and Benefit/Cost Ratio are difficult to apply to industry associations. As such, the alternative valuation methodologies of Value at Risk and Equivalent Redundancy can be used. It seems that when using these alternative valuation methodologies, even a quick calculation reveals that the value generated by CCANZ for the common good of the concrete industry in 2013 was, and will continue to be in 2014, extremely significant. I wish you all a very pleasant and safe Christmas and New Year break, and look forward to another busy and stimulating year in 2014. Rob Gaimster CCANZ, CEO
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Cover photo: Hurstmere Green in Takapuna. Simon Devitt Photography.
NEWS
NEWS 2012-13 CCANZ ANNUAL REPORT The 2012-13 CCANZ Annual Report was presented at the 2013 AGM held recently at the New Zealand Concrete Conference in Queenstown. Reporting against the strategic plan, the document outlines achievements within the following areas - Baseline Activity, Communications, and Projects - the latter grouped into the following strategic themes: • Growth • Competitive Construction System • Education, Training and Research • Sustainability • Legislative and Regulatory Framework The fulfilment of the CCANZ work programme during the 2012-13 year required a constructive and spirited attitude from all staff. Outcomes were designed to assist industry consolidate its current position and optimise future opportunities. The 2012-13 Annual Report can be downloaded from the CCANZ website – www.ccanz.org.nz
PORTRAIT OF A HOUSE WINS DINZ AWARD Simon Devitt’s photo essay Portrait of a House, proudly supported by CCANZ, has taken home a Gold Pin at the recent Designers Institute of New Zealand (DINZ) awards evening. Recognised in the category New Zealand’s Best Graphic Design - Editorial and Book, the judges commented that the book was a “beautifully crafted, quiet but comprehensive work, which got better in the reading. As much about the life that has been lived in the house, as the house itself.” CCANZ congratulates Simon and the Inhouse graphic design team - Arch MacDonnell, Toby Curnow and Sarah Gladwell.
STEEL FIBRE DOSING Take advantage of Maccaferri’s air blower equipment for your next steel bre project. Provides improved safety, speed of operation and excellent bre distribution. We make this equipment available for use to all NZ Ready Mix concrete producers.
To enquire for your next project CALL 0800 60 60 20 sales@maccaferri.co.nz www.maccaferri.co.nz
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NEWS
Fibre Reinforced Polymer (FRP) Systems – Design with Confidence Until recently the FRP industry in New Zealand has had no acceptance criteria or regularity body to comply with the New Zealand Building Code. The CodeMark™ Certificate of Conformity has been jointly developed by the New Zealand Department of Building and Housing and the Australian Building Codes Board.
W E N
What is CodeMark™? CodeMark™ is a building product certification scheme. The CodeMark™ scheme supports the use of new and innovative building products by providing a nationally and internationally accepted process for products to be assessed for compliance with the requirements of the building codes of Australia and New Zealand. The scheme provides confidence and certainty to regulatory authorities and the market through the issue of a Certificate of Conformity. To gain CodeMark™ Certification the products must meet strict manufacture, quality assurance, independent testing criteria and also meet the durability requirements of a minimum of 50 years as stipulated in the New Zealand Building Code. Tyfo® Fibrwrap® Systems are currently the only FRP system to have been CodeMark™ Certified in New Zealand. The CodeMark™ Certification of FRP Systems is being welcomed as a positive move within the industry by Structural Engineers in New Zealand, as they can now have confidence that the products they are specifying are fit for purpose and comply with essential sections of the New Zealand Building Code. For more information contact: Neil Chevalier, Building Chemical Supplies Ltd www.buidingchemicalsupplies.co.nz 4 concrete
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Aquapel infused lightweight concrete flooring super hydrophobic, with steel mesh reinforcing waterproof when cut easy handling, cost effective all weather installation
www.reseneconstruction.co.nz 0800 50 70 40
NEWS
DENE COOK APPOINTED CCANZ CHAIR At the October CCANZ AGM held in Queenstown Dene Cook, representative of the New Zealand Portland Cement Association (NZPCA), was appointed to the role of CCANZ Chair. Dene is familiar to many as a former CCANZ project manager, and more recently as the technical manager for Firth Industries and currently Fletcher Building.
CCANZ CEO Rob Gaimster was recently recognised by the Institute of Concrete Technology (ICT) in the UK as an Honorary Fellow. Dene Cook
Dene replaces Ross Pickworth, general manager cement at Holcim (New Zealand) Limited, who as a NZPCA representative occupied the Chair position from 2010. Ross will remain a CCANZ Board member. Ross Pickworth
NZ AUTHORS RECOGNISED BY PCI Rhys A. Rogers, Liam Wotherspoon, Allan Scott and Jason M. Ingham have been recognised by the Precast/Prestressed Concrete Institute (PCI) in America with the 2013 Martin P. Korn Award for their paper Residual Strength Assessment and Destructive Testing of Decommissioned Concrete Bridge Beams with Corroded Professor Pretensioned Reinforcement. The paper appeared in the Summer 2012 issue of the PCI Journal.
ROB GAIMSTER ELECTED ICT HONORARY FELLOW
Jason Ingham
The Award, named in honour of PCI’s first Executive Director, recognizes the paper offering the greatest contribution to the advancement of precast prestressed concrete technology in research and design. Copies of the paper can be obtained from the CCANZ library – library@ccanz.org.nz
Established in 1972, the ICT is the UK concrete sector’s professional development body. Operating Rob Gaimster throughout the world the ICT is an awarding body for qualifications in concrete technology – most notably the Diploma in Advanced Concrete Technology. The ICT has a long-established tradition, commencing in 1975, of awarding significant figures in the field the status of Honorary Fellow, in recognition of their contribution to the Institute or concrete technology in general. A selection of previous recipients of the honour includes Prof A.M. Neville, T.C. Powers, Dr V Malhotra, Sir F.M. Lea and Prof R.K. Dhir. Rob was President of the ICT from 2004 to 2006, and led the merger discussions with the UK Concrete Society.
CARL ASHBY ASSUMES CONCRETE SOCIETY PRESIDENCY Carl Ashby, a Wellington-based Structural Group Manager for Opus International Carl Ashby Consultants, has taken over from Professor Jason Ingham as the President of the New Zealand Concrete Society (NZCS). Carl has been involved at committee level with other professional institutions, including the Structural Engineering Society (SESOC) and the NZ Earthquake Engineering Society (NZSEE). Carl will replace Professor Ingham as the NZCS representative on the CCANZ board.
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NEWS
2013 ARCHENG STUDENT WORKSHOP Building on the inaugural 2012 proof-of-concept event in Wellington, the 2013 ArchEng student workshop was hosted by Auckland University’s School of Architecture. Once again the over-riding objective was to encourage aspiring architects and structural engineers to work together to incorporate the best insights and latest technology into a building design. Working in cross-disciplinary teams of two, the 20 students from across the country gained extra motivation through the $5,000 first prize. As a result, the quality of the team’s final design development on a Mt Eden site was outstanding.
Anthea and Lynette – The Winning Team
The 3-day ArchEng workshop is a large part of the CCANZ drive to engage with early career professionals, and assist in promoting concrete as a premium construction material to the next generation of designers and construction experts. CCANZ took the opportunity to invite the Auckland Council, PrefabNZ, the NZ Green Building Council and Darcy Polychrome to be part of this year’s event. The students were also lucky enough to be shown around Auckland’s Q Theatre by Pip Cheshire - NZIA’s architect of the year in 2012. See pages 20-21 for a quick look at the Q Theatre. Check out the short film on YouTube that illustrates what an invaluable annual event ArchEng is becoming for all those involved - www.youtube.com/user/cementconcrete
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NEWS
CCANZ SKILLS MAINTENANCE WEBSITE CCANZ has developed a Skills Maintenance website to assist both industry and early career professionals. The site can be accessed via www.construction.school.nz The site has been designed so that once admitted, the learner can enrol in any course they wish, and access the course material, but their course status will not register ‘complete’ until a grade of 9/10 in the quiz has been achieved. CCANZ expects this will be a key feature for lab managers to maintain their team’s skills. A collection of 8 videos covering the basics of fresh and hardened concrete testing comprises the content of the site’s launch course. This mirrors the CCANZ Concrete Technician’s Fresh and Hardened Concrete Testing day course (for the NZQA modules 26053 and 26063).
This was chosen for the launch for two reasons: 1. The testing videos developed can be used in the day course itself to help teach the attendees. 2. By using the site as a learning platform in isolation much of the practical benefit of the courses can be gained whenever and wherever the learner requires. This will be of immense value to labs that are not able to attend the annual CCANZ courses. The site is not a replacement for the in-person accreditation requirements to achieve the NZQA standards, but it is expected to be a complementary service for their existing training programmes. The testing videos can be accessed outside of the Skills Maintenance website on the CCANZ YouTube channel www.youtube.com/user/cementconcrete Additional modules for the Skills Maintenance website are currently under development by CCANZ.
CCANZ is eager to gauge industry feedback in response to both the ArchEng student workshop and the Skills Maintenance website. Specifically CCANZ is looking to talk to organisations interested in utilising and contributing to the Skills Maintenance website.
Dr Joe Gamman
Concrete Solutions Our Rockcote 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 masonry substrates.
www.reseneconstruction.co.nz 0800 50 70 40
Contact CCANZ Education & Development Manager Dr Joe Gamman to discuss the options available – joe@ccanz.org.nz or 027 286 7121.
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Figure 1. South Rangitikei Viaduct
NZ CONCRETE SOCIETY
preparING to cele THE NEW ZEALAND CONCRETE SOCIETY (NZCS), A GROUP OF LIKE-MINDED PROFESSIONALS DEDICATED TO ENSURING THAT THE USE OF CONCRETE IS OPTIMISED THROUGH FREE AND FRANK INFORMATION EXCHANGE, WILL CELEBRATE ITS 50TH ANNIVERSARY in 2014. NEW ZEALAND PRESTRESSED CONCRETE INSTITUTE The Society was established in 1963 as the New Zealand Prestressed Concrete Institute (NZPCI), under the guidance of founding President Sandy Cormack, a hugely important figure in the development of the New Zealand concrete industry. At that time economic conditions meant that the importation of construction materials into New Zealand, specifically structural steel, was virtually prohibitive. As such, prestressed concrete, with its efficient use of steel, offered a competitive edge. Financial incentives combined with the wave of prestressing advances coming out of Europe made this new technique extremely attractive to the New Zealand construction industry. As outlined at the 2002 concrete conference by Sandy’s son Gavin Cormack, then Executive Chairman of Beca Consultants, the NZPCI was formed to promote prestressing by “integrating the universities (teachers and researchers), the contractors, the suppliers of pre-stressing materials, and the consulting engineers with the Ministry of Works and local authorities.” NEW ZEALAND CONCRETE SOCIETY Over the ensuing decades the NZPCI maintained its focus on
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encouraging greater knowledge and understanding of all aspects of concrete technology and concrete construction in order to support their development and use where appropriate. However, in 1980 the Institute made the decision to change its name to the New Zealand Concrete Society to better reflect the wider range of matters it was involved with.
Sufficient progress had been made in the areas of prestressing and seismic engineering to allow the NZPCI to broaden its focus to include durability issues and new construction techniques - this combined range of objectives continue to direct the Society’s activities today. NOTABLE INDIVIDUALS In addition to his work with the NZPCI Sandy Cormack’s influence on the concrete industry is also illustrated by his work in the area of quality control. Also highlighted by Gavin Cormack in his 2002 presentation, the middle of the 20th century was a time when the vast majority of major construction projects in New Zealand were state controlled. While this environment enabled some truly outstanding achievements, it was not always conducive to innovation and was at times prone to overly conservative design. A key component of Sandy Cormack’s strategy to progress the concrete industry and place it on a robust commercial footing was to establish an independent, industry regulated, quality control mechanism, and at the same time promote it to purchasers and specifiers. His endeavours proved successful, with the NZRMCA Plant Audit Scheme still operating today.
celebrate 50 years Other key figures who influenced the NZPCI and the wider concrete industry in the early years included Bob Norman (second President 1966); Morley Sutherland (President 1970-71) an enthusiast with a passion for prestressed concrete; J.B.S. (Hans) Huizing who held senior posts in the Ministry of Works; and Rob Irwin, to mention just a few.
These activities will include a commemorative publication as well as a series of stories on the industry and its significant milestones.
Bob Park, a hugely influential figure in structural engineering both in New Zealand and internationally, was NZPCI President in 1975-6, bringing with him an emphasis on new concrete design philosophies.
Figure 1. View of the south pier of the Mangaweka Viaduct. Further negatives of the Evening Post newspaper. Ref: EP/1974/4481A/12-F. Alexander Turnbull Library, Wellington, New Zealand. http://natlib.govt.nz/ records/23254034
OUTSTANDING STRUCTURES
Figure 2. Construction of southern motorway viaduct, Newmarket, Auckland, including house used as site office. Whites Aviation Ltd :Photographs. Ref: WA-63227-F. Alexander Turnbull Library, Wellington, New Zealand. http://natlib.govt.nz/records/23221612
Over the past 50 years many outstanding concrete structures have been realised across New Zealand, with most, if not all, benefiting from the technical and collegial support offered by the Society. In some shape or form, members of the Society played a role in the original Newmarket Viaduct (first in-situ cantilever bridge), the South Rangitikei Viaduct (first base isolated bridge), the Ngauranga Interchange in Wellington (first push bridge) and the Sky Tower (tallest structure).
Celebrations will culminate with the 2014 New Zealand Concrete Industry Conference to be held in the Society’s spiritual home of Wairakei, the venue of the first conference - 50 years ago.
Figure 2. Newmarket Viaduct
Over more recent years the Waitakere Trusts Stadium, the Wellington Inner City Bypass, Victoria University’s Alan MacDiarmid building (first multi-storey PRESSS building) and the post-tensioned joint-less slab at K-Mart’s Manukau warehouse have all been realised in part through the expertise fostered by the Society. A CELEBRATION OF 50 YEARS A range of communication activities and events are planned over coming months and into 2014, which will celebrate the Society’s achievements, its distinguished members, as well as a number of the enduring concrete structures that grace the New Zealand landscape.
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Client Willis Bond & Co Ltd Architectural Team Nick BarrattBoyes, Daryl Calder, Karl Frost, Lianne Cox, Diana Chaney Structural Engineer Dunning Thornton Consultants (Adam Thornton) Services Engineer Beca
Images. Patrick Reynolds.
Contractor L.T. McGuinness
CAPITAL EARTHQUAKE STRENGTHENING PART II IN THE PREVIOUS ISSUE OF CONCRETE MAGAZINE THE 2013 EARTHQUAKE STRENGTHENING AWARDS WERE PROFILED ALONG WITH A RECENT EXAMPLE OF SUCH WORK ON THE ROYAL SOCIETY OF NEW ZEALAND BUILDING IN WELLINGTON. Taking the structural lead on that project was engineering practice Dunning Thornton Consultants, whose involvement with the redevelopment of the John Chambers Building (Xero House) and the Central Park Apartments, both in Wellington, was also acknowledged by the Awards. The specific concrete elements of these recently completed projects are outlined here. 10 concrete
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John Chambers Building / Xero House By Adam Thornton Constructed in 1918 this building is heritage listed by Wellington City Council for its prominent position, strong lines and materiality. Designed by Hoggard, Prouse and Gummer Architects, it celebrates a “no-nonsense” industrial aesthetic, with the heritage listing specifically mentioning the “technical value” of the early concrete construction. Damaged by the 1942 Wairarapa earthquakes, the building was strengthened soon after by the insertion of a number of diagonal concrete braces. The structure is founded on soft soil and the building was designated earthquake prone under the 2004 Building Act. In addition, the concrete facade had deteriorated with drummy
render and reinforcing spalling. Any refurbishment and strengthening needed to address the understrength structure, the lack of ductility/robustness, the façade issues and at the same time make use of the tall, modernist-style warehouse spaces. The seismic retrofit employs a combination of selective weakening, plus the insertion of stiff wall-frame elements to control movement of the old structure. The brittle, concentric 1942 braces were removed and the east boundary wall was saw-cut into panels to reduce potential torsional actions. Columns were separated from the spandrels by saw-cutting to prevent potential “short column” shear failure, and the spandrels were also strengthened to resist seismic face loads. New major shear wall-frames were inserted along with a new circulation core that with careful architectural planning does not diminish the large internal spaces. These walls needed to be long to add stiffness and to reduce the foundation overturning uplift loads. Deep concrete beams with multiple piles and anchors were constructed to provide the appropriate foundation strength. To add energy absorption, the wall-frames were coupled into a series of columns and short span beams. The ductile coupling beams provide ductility but also limit displacements to a level compatible with the existing structure. They also allow for access and servicing through the wall lines both now and in future reconfigurations. The existing facade was rehabilitated using a combination of
hydro and mechanical removal of poor concrete, treatment of the existing steel and concrete surfaces and specialist cementitious plaster rebuild. The parapets, both lightly reinforced concrete and in some areas incorporating brick, were vertically post-tensioned to provide the retained structures with sufficient strength. The redeveloped building retains its original modernist characteristics. The internal character spaces celebrate the aesthetics of concrete, and help provide a thermal inertia to the environmental control of the building. The building’s flexibility is expressed by its tenants’ different characters: from the formal top floor, to the industrialist Xero fit out, to Trade Me’s fun slide in the ground floor “nose” of the building. The redevelopment is a celebration of concrete at many levels. The style and durability of the 90-year old exterior has been preserved and prolonged, while the architectural merit of the industrial interior is celebrated and also assists to moderate the building’s internal temperature. At the same time, the carefully designed and installed modern concrete elements will help protect the building form any future earthquakes. It is however, the building’s demonstration of how good, original floor plates can be economically refurbished and strengthened, particularly at a time when New Zealand has lost, or is at risk of losing so many heritage buildings following the Canterbury Earthquakes, that elevates this project’s importance.
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Client Wellington City Council – Housing Upgrade Project Architects Novak + Middleton Project Manager RCP Structural Engineer Dunning Thornton Consultants Contractor L.T. McGuinness
Central Park APARTMENTS By Paul Brimer & John Cuthbert Social housing demands a building material that is robust, durable and provides good acoustic and fire separation characteristics, all while maintaining economy of construction. The concrete structure of Wellington City Council’s Central Park Apartments has fulfilled these requirements admirably for the past 45-years. During that time however, the original architectural planning which allowed public circulation throughout the whole complex caused unacceptable security issues. The publicly funded redevelopment looked to maximise and re-use the functioning aspects of the original design as much as practical as a cost saving measure. Interventions were limited to providing new circulation and associated amenities to create more secure areas of the building, grouped around remodelled stairs and cores with new atria. These elements, formed from a combination of precast and in-situ concrete carried on the “toughness” that was successful in the original design, but in a way that offers a softer, calmer aesthetic.
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Through analysis of the primary concrete structure in each of the five blocks, strengthening to in excess of 70% New Building Standard was achieved by targeted interventions so as to not disrupt the overall main structure. Additional walls were provided around the new atria, redundant doorways were in-filled, wall irregularities were removed, and composite fibre was bonded to the existing walls to locally improve in plane shear capacity. The building is founded in a valley on a thick layer of clay, so additional micropiles were added to meet the seismic demands of both new and existing concrete wall elements. These micropiles were drilled inside or near to the existing structure, and integrated with new foundation beams. The existing tower block was originally built inter-connected with a section of the lower blocks, causing a weakness at the structural discontinuity of the tower/podium interface. Concepts for extensive strengthening of this were an expensive aspect of the project. An alternative was conceived where by the tower was vertically separated from the podium. This rendered the structure more regular and
flexible, allowing for strengthening work to be concentrated around the new separations, infill walls around redundant circulation, and new micropiles to complement the existing foundations. Significant project savings were realised through this approach. By reducing the scope and scale of structural intervention and structurally isolating individual blocks, the retrofit could be carried out on a “block-by-block” basis with remaining tenants largely undisturbed. This was an important aspect for the client, as alternative accommodation space was limited. Careful propping of the existing two-way floor slabs around the new stair shafts and atria allowed machines to carry out the work as fast as practical. Reconstruction using precast concrete for the stair shafts and new “clip on” balconies aided the speed and reduced the noise of the build. The refurbished units continue to use exposed concrete to give them toughness and to moderate the internal environment with an improved external envelope. The new precast balconies continue this theme of raw concrete, the benefits of which include weathertightness, durability and simplicity of construction. Concrete landscaping elements flow out into the plazas to draw in the connection to the mature trees and Central Park itself. Overall the project has been extremely successful for the client and is a benchmark example of how, through the flexibility and unique characteristics of concrete, a social housing complex can be preserved and redeveloped economically to create a lasting asset for Wellington’s ratepayers and the community.
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Images: Simon Devitt
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Roshan Nauhria of Nauhria Precast accepts the 2013 Supreme Concrete3 Sustainability Award from CCANZ Chair Dene Cook
SUPREME AWARD & EXCELLENCE IN CONCRETE FOR THE COMMUNITY
NAUHRIA PRECAST FOR THE HURSTMERE GREEN REDEVELOPMENT IN TAKAPUNA Nauhria Precast has won the 2013 Supreme Concrete3 Sustainability Award for the redevelopment of Takapuna’s Hurstmere Green into a contemporary and vibrant public space. Sills Van Bohemen Architects were responsible for project design, while Kalmar Construction were the contractor. The Award, presented at the annual New Zealand Concrete Conference in Queenstown on 4 October, celebrated the rejuvenation of what had become an overgrown and under-utilised park into an attractive and accessible community facility that has helped breathe new life into the surrounding Takapuna shopping area. The judging panel applauded the quality of Nauhria Precast’s bespoke precast elements, manufactured using Monarc diamond processing technology, which provide the hard landscaping frame and retaining capability for Hurstmere Green, as well as a range of superbly finished concrete surfaces. “This project demonstrates a high degree of expertise across all areas. Modern, yet sensitive urban landscape design has been brought to life by astute material selection and outstanding skill during construction. The elegant hard concrete landscaping and organic shapes of the green areas combine with stunning effect to reinvigorate a community facility that proudly embodies the principles of sustainable concrete construction,” commented the judges.
The manufacturing process for the precast panels paid particular attention to environmentally responsible practices, with all process water recycled along with the slurry from the surface finish refinement process. Precast, pre-finished elements allowed for rapid and efficient assembly on-site, while the enhanced durability offered through concrete will ensure longevity and low maintenance throughout an extended service life for this much loved community space. On its way to the top prize, the Nauhria Precast team was also presented with the Excellence in Concrete for the Community category award. The judges recognised Whitireia Building Programme 1 submitted by CGM + Foster Architects Ltd as worthy of a Merit Award in this category.
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Images: Diederik Van Heyningen
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EXCELLENCE IN RESIDENTIAL CONCRETE CONSTRUCTION
SHEPPARD & ROUT ARCHITECTS FOR POYNDER AVENUE HOUSE IN CHRISTCHURCH This spectacular Fendalton home is based around two large cast in-situ concrete spine walls that give clear expression to the client’s brief for a sense of substance and permanence. The walls form a key element of the building, connecting the structure to the site as well as defining the planning and separation of living spaces. The quality of concrete finish achieved by the contractor is of a consistently high standard throughout the house, with the added complexity of the boarded formwork finish giving a raw material quality to building.
Along with architects Sheppard & Rout Architects the other project principals were Structex and Phil Benton Builders.
The concrete provides a key thermal mass to the house, with the intention to control fluctuations in base temperature, and assisting the efficiency of heating systems such as the hot water that runs through pipes cast in the concrete floor slab. The thick walls also conceal the services, as well as helping acoustic insulation to create a quiet, healthy and durable family home. The judges recognised Westmere House submitted by Bannan Construction as worthy of a Merit Award in this category.
David Sheppard of Sheppard & Rout Architects accepts the Excellence in Residential Concrete Construction Award from CCANZ Chair Dene Cook
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EXCELLENCE IN CONCRETE INNOVATION
ALLIED CONCRETE FOR THE WEATHER APP This smart-phone based forecasting program, available on different platforms, is designed to give concrete placers an indication of weather patterns over a 7-day timeframe, and in turn the potential influence they may have on the placing process. New Zealand weather conditions are unfortunately ideal for plastic or thermal cracking. Ready mixed concrete customers regularly find their concrete damaged as a result of an unwise decision to proceed with a pour in unsuitable conditions. This represents an immediate cost to the placer or builder, but is also a significant environmental cost as otherwise sound concrete is removed and replaced due to what are usually aesthetic, rather than structural issues. Along with a host of other features, the app provides a forecast for your location for the current day, with 3-hourly plastic cracking likelihoods. It also advises if overnight thermal cracking is likely or not. By using the weather app, customers can assess the likelihood of cracking due to potentially adverse weather conditions. Helping to avert a situation where concrete has to be removed and replaced means the weather app saves money and protects the environment.
Chris Munn of Allied Concrete accepts the Excellence in Concrete Innovation Award from CCANZ Chair Dene Cook
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EXCELLENCE IN COMMERCIAL CONCRETE CONSTRUCTION
CHESHIRE ARCHITECTS FOR THE Q THEATRE IN AUCKLAND Q Theatre, a new performing arts facility in Auckland, utilises concrete to help achieve its sustainability goals through the re-use of a concrete framed building on Queen Street. The effect is to unlock the evocative power of the existing heritage structure, carefully manipulate its configuration and ensure its long-term sustainable use. The designers created a new precast concrete clad auditorium building that extracts the maximum value from this material by utilising its structural capacity for shear walls, its mass for acoustic separation and its free form potential and texture to enliven the façade. The complex concrete cladding panels evolved in close collaboration with Nauhria Precast, project engineers and the theatre acoustician. The panels use naturally pigmented McCallum’s aggregate, ground and off form surfaces, tessellated geometry and applied dye to generate a dynamic surface. Diamond brushed precast panels provide a graffiti manageable and non-abrasive surface at busy pedestrian access routes, and the exposed aggregate references the base level stonework of the Town Hall.
Working on a tight site, with an even tighter budget, the project team, which also included Holmes Consulting and Naylor Love Construction, used concrete to deliver a commercial building of character and beauty that enriches its social setting, preserves resource through re-use and demonstrates its overall success through a regularly packed auditorium. The judges recognised the Geyser Building in Auckland submitted by Nauhria Precast as worthy of a Merit Award in this category.
For more information on the Concrete3 initiative visit www.sustainableconcrete.org.nz
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CCANZ STRUCTURAL ENGINEER ALISTAIR RUSSELL TAKES A QUICK LOOK AT THE NEW CCANZ INFORMATION BULLETIN IB 95 DRILLING, CUTTING OR FORMING HOLES IN SUSPENDED FLOOR SLABS.
WHAT ARE THE REQUIREMENTS FOR PENETRATIONS IN SUSPENDED CONCRETE FLOOR SLABS? PENETRATIONS ARE REQUIRED THROUGH FLOOR SLABS FOR VARIOUS REASONS, MOST COMMONLY FOR SERVICES OR ACCESS. WHERE PENETRATIONS ARE DETAILED ON THE STRUCTURAL DRAWINGS, THE ENGINEER WILL HAVE ALLOWED FOR THEM IN THE DESIGN AND THEY WILL NOT CONSTITUTE A PROBLEM. WHEN PENETRATIONS THAT ARE NOT DETAILED ON THE STRUCTURAL DRAWINGS ARE FORMED OR CUT THROUGH A SUSPENDED FLOOR SLAB THEY NEED PROPER CONSIDERATION. Moreover, penetrations which differ from those specified on the structural drawings, either through size or location, must be checked by the engineer responsible before being formed. Penetrations cut or formed through a suspended floor slab can seriously affect its structural capacity by reducing its bending or shear strength, or both. It is easy for one small hole to cut through a critical piece of reinforcing or to remove a section of concrete essential to the shear capacity. It is imperative that specialist advice is obtained prior to forming or cutting a penetration through a suspended floor where the penetration is not detailed on the structural drawings. Figure 1: Plumbing penetrations in hollowcore
capacity if reinforcing is cut. These limits on size, location and spacing of penetrations must be carefully specified in the design and adhered to by the constructor. This may involve only a small additional cost that is outweighed by the convenience, flexibility and by not having to obtain further approvals. No penetrations should be cut or formed through a floor slab unless they are either detailed on the structural drawings, or specific written approval has been obtained from the person responsible for the structural design of the floor prior to forming them. Issues to be considered when forming penetrations through floors include the effect on: • bending capacity • shear capacity, both vertical and horizontal (diaphragm action) • reinforcing cover • fire ratings or fire spread • acoustic separation • the additional protection required for outdoor or harsh environments Each item may require input from an appropriately qualified professional. The person responsible for structural design may only be able to comment on the first three of these considerations.
It is relatively simple to design a suspended floor to allow a number of penetrations to be cut after construction with limits on the size, location and spacing. This is done by providing additional reinforcing to ensure sufficient strength remains despite the loss of some
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The following comments are for general information only and do not override the requirement to obtain written approval from the person responsible for the structural design of the floor prior to forming any penetrations not detailed on the structural drawings.
HOLES FORMED PRIOR TO PLACING IN-SITU CONCRETE ON SITE Prior to placing in-situ concrete on site designers will determine the effect of proposed penetrations on the structural adequacy of the completed floor. For cast in-situ reinforced or post tensioned floors, or for metal decking floors, it is relatively easy, compared with precast elements, to identify the critical reinforcing. Thus the penetrations can be located so they will not affect the structural capacity of the completed floor or compromise the integrity of the reinforcing through reduced cover. Alternatively, additional reinforcing or supports can be provided. While floor slabs are generally located on the interior of a structure, special consideration needs to be given when making penetrations that reduce concrete cover in horizontal slabs which are exposed to the external environment. Where penetrations are needed, even in internal environments, specialist advice should be sought to determine if alternative corrosion protection is required, such as galvanizing or epoxy coating of the embedded reinforcement. For rib and infill floors the critical reinforcing is normally contained within the rib, and designers can locate penetrations in non-critical areas. Large penetrations between the ribs can reduce the bending capacity if they leave an insufficient compression zone. For floors incorporating precast double tees and precast single tees it is also relatively simple for designers to locate penetrations in
Fire collar
Expansion anchor
Light bracket
non-critical areas away from the tee down stand. The effect of large penetrations on bending capacity through reduction of compression zone requires consideration. The critical reinforcing in prestressed flat slab floors can be seen at the ends of the precast units. With hollowcore floor units the reinforcing can be seen at the ends of the units. Generally the vertical webs should remain intact and penetrations should not be drilled or cut that affect the vertical webs. Penetrations must not compromise prestressing strands. HOLES CUT AFTER THE FLOOR CONSTRUCTION HAS BEEN COMPLETED It is far more preferable to plan and make penetrations as part of the design of the floor prior to placing in-situ concrete, whether the insitu concrete is topping over the precast elements, or the floor itself. Cutting critical reinforcement or compromising stressing strands can render the floor unsound or unsafe, and must be fully appreciated at the installation stage. Once the in-situ concrete is in place it is very difficult to determine the location of critical reinforcing in the floor slab. For cast in-situ reinforced or post-tensioned floors, the original structural drawings will give an indication of the reinforcing size and spacing but cannot be relied upon to give the precise location. The
Heavy bracket
Hilti HCC anchor
Threaded rod
Hilti HTW twin anchor
Figure 2: Fixings to hollowcore
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effect of cutting or damage to reinforcing depends on its location. It is unlikely that any damage to post-tension ducts would be acceptable.
considered by the design engineer before being made. Some examples are:
Rib and infill floors, and floors incorporating precast tees should be examined from the exposed underside before any decision is made (by the engineer) regarding cutting penetrations.
• horizontal penetrations through ribs and single/double Tee downstands, which affect both the shear and flexural capacity of the support
Determining the precise location of critical reinforcing in precast flat slabs and hollowcore units is more difficult. The manufacturer of the precast units may be able to give some guidance but may not be able to give accurate locations. If possible, the infill sections between spaced hollowcore units are a more suitable location to accommodate penetrations and services than the units themselves. Holes should not be cut through existing floors incorporating precast units without consulting the original supplier where known, or a specialist with expertise in precast floor units. Drilling contractors should stop drilling or cutting where they encounter reinforcing steel. Structural engineering advice should be sought and if permitted to proceed, written confirmation should also be obtained. Penetrations are sometimes required as part of the floor installation, but are not detailed as part of the design, for example, hollowcore floor units that need to be cut to accommodate perimeter columns. This should be referred back to the engineer for advice before installation. There are penetrations in completed floors that do not directly affect floor reinforcement but can still be a problem, and must be
• horizontal penetrations across the hollow cores of floors; which could initiate a premature shear failure • penetrations that reduce seating of precast units • multiple small penetrations along diaphragm connections to perimeter frames or walls FURTHER READING • CCANZ Information Bulletin: IB 76 Precast Concrete Floors • CCANZ Information Bulletin: IB 72 Coring Concrete for Strength Assessment • NPCAA/CIA (2009). Precast Concrete Handbook. National Precast Concrete Association Australia/Concrete Institute of Australia. • NPCAA/CIA (2002). Precast Concrete Handbook. National Precast Concrete Association Australia/Concrete Institute of Australia. Commentary for New Zealand Users ACKNOWLEDGEMENTS • Rod Fulford of Precast NZ for Figure 1. • John Marshall of Stahlton NZ for Figure 2. IB 95 was compiled with the assistance of Precast New Zealand Inc. and can be downloaded from the CCANZ website - www.ccanz.org.nz
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.
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Concrete solutions
“The Holcim Awards is an amazing opportunity to contribute ideas, but also to learn from others and to celebrate those that win.” Maria Atkinson AM, Co-Founder Green Building Council of Australia. Member of the Global Holcim Awards jury 2012.
4th International Holcim Awards for sustainable construction projects. Prize money totals USD 2 million.
Renowned technical universities lead the independent juries in five regions of the world. They evaluate projects at an advanced stage of design against the “target issues” for sustainable construction and allocate additional prizes for visionary ideas of young professionals and students. Find out more about the competitions at www.holcimawards.org The Holcim Awards is an initiative of the Swiss based Holcim Foundation for Sustainable Construction. It is supported by Holcim and its Group companies and affiliates in around 70 countries, including Holcim New Zealand. Holcim Ltd is one of the world’s leading suppliers of cement and aggregates.
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P E R M E A B L E PAV I N G F E AT U R E
THE FOLLOWING IS AN INTRODUCTION TO CONCRETE BLOCK PERMEABLE PAVING (CBPP) FROM INTERPAVE (THE PRECAST CONCRETE PAVING AND KERB ASSOCIATION) IN THE UK. It is SUGGESTED that Interpave’s document Understanding Permeable Paving, which provides essential information on all aspects of permeable pavements, is also consulted – www.paving.org.uk
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P E R M E A B L E PAV I N G F E AT U R E
PRINCIPLES
PRODUCTS
CBPP has a dual role, acting as the drainage system as well as supporting traffic loads. CBPP allows water to pass through the surface – between each block – and into the underlying permeable sub-base where it is stored and released slowly, either into the ground, to the next SuDS management stage or to a drainage system. Unlike conventional road constructions, the permeable sub-base aggregate is specifically designed to accommodate water. At the same time, many pollutants are substantially removed and treated within the CBPP itself, unlike attenuation tanks.
There is a growing choice of concrete blocks and flags available from Interpave manufacturers, designed specifically for permeable paving. Essentially they have the same impressive performance as conventional precast concrete paving products, including slip and skid resistance, durability and strength. The difference with CBPP is enlarged joints created by larger than conventional spacer nibs on the sides of each unit. These joints are subsequently filled with a joint filling material specific to each product, which is an angular aggregate, water will continue to pass through the joints over the long-term.
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P E R M E A B L E PAV I N G F E AT U R E
SYSTEMS There are three different CBPP systems, described as Systems A, B and C in all Interpave guidance. These systems were initially identified by Interpave and their designations have now been adopted in British Standards, The SuDS Manual (CIRIA 2007) and elsewhere. There is no difference between the surface appearances of the different Systems but each has unique characteristics making it suitable for particular site conditions. SYSTEM A – FULL INFILTRATION
SYSTEM A – FULL INFILTRATION
Suitable for existing subgrade (ground) with good permeability, System A allows all the water falling onto the pavement to infiltrate down through the constructed layers below and eventually into the subgrade (ground). Some retention of the water will occur temporarily in the permeable sub-base layer allowing for initial storage before it eventually passes through. No water is discharged into conventional drainage systems, completely eliminating the need for pipes and gulleys, and making it a particularly economic solution. See page 29 for a case study demonstrating System A – Full Infiltration. SYSTEM B – PARTIAL INFILTRATION
SYSTEM B – PARTIAL INFILTRATION
Used where the existing subgrade (ground) may not be capable of absorbing all the water. A fixed amount of water is allowed to infiltrate – which, in practice, often represents a large percentage of the rainfall. Outlet pipes are connected to the permeable sub-base and allow the excess water to be drained, via a flowcontrol device, to other drainage devices, such as swales, ponds, watercourses or sewers. This is one way of achieving the requirement for reducing the volume and rate of runoff and will most likely remove the need for any long term storage. SYSTEM C – NO INFILTRATION Where the existing subgrade (ground) permeability is poor or contains pollutants, System C allows for the complete capture of the water. It uses an impermeable, flexible membrane placed on top of the subgrade (ground) level and up the sides of the permeable subbase to effectively form a storage tank. Outlet pipes are constructed through the impermeable membrane to transmit the water to other drainage devices, such as swales, ponds, watercourses or sewers. Importantly, the outlet pipes are designed to restrict flow so that water is temporarily stored within the pavement and discharge slowed.
SYSTEM C – NO INFILTRATION
David Barnard, Executive Officer for the New Zealand Concrete Masonry Association (NZCMA) comments that while this Interpave article presents an excellent example of using permeable paving, products manufactured by members of the NZCMA are available in New Zealand supported a ‘Firth Ecopave System – Installation Guide’ available from Firth Masonry. Other references to New Zealand applications can be found in the New Zealand Concrete Masonry Manual – www.nzcma.org.nz.
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P E R M E A B L E PAV I N G F E AT U R E
CASE STUDY
Designed by: Suffolk County Council Environment and Transport Architects: Mouchel Landscape Designers: The Landscape Partnership
PROJECT DESCRIPTION The Park and Ride facility at Martlesham was one of Suffolk County Council’s top priority transport schemes and the third park and ride to be built serving Ipswich, offering sustainable transport alternatives to the car. It was also the first large-scale concrete block permeable pavement (CBPP) project to be undertaken by the Authority. Following extensive public consultation the park and ride scheme formed part of Suffolk County Council and Ipswich Borough Council’s Transport Strategy, which included plans for five park and ride schemes around the town aiming to dramatically reduce the level of traffic congestion within Ipswich. The Martlesham site was chosen for its prime location on the eastern side of town and accessibility to the junction of the Ipswich eastern bypass. This choice followed extensive consultation and a detailed examination at a public enquiry. The location and access advantages of the site outweighed any potential adverse environmental effects that development might have had on the site and surrounding area: the site is part of a designated ‘Special Landscape Area’ and also part of a ‘County Wildlife Site’ with areas of acid grassland. Since completion, the number of people using the park and ride scheme is gradually rising and there is already a high level of regular customers. The local residents are pleased with the new service and have been extremely complimentary about the site design and facilities. DESIGN PHILOSOPHY The site occupies a total of 3.2ha with space for 530 cars. The key challenge for the project was to mitigate the adverse environmental and landscape effects of the development by incorporating SuDS techniques into the overall design to reflect the sustainability credentials of the Park and Ride concept. A complete paving solution was also required to create a surface of high industrial strength to withstand heavy vehicles, as well as attractive and accessible pedestrian areas. Overall design objectives included: • Visually attractive CBPP capable of full infiltration of rainwater to the ground • A terminal building with a green roof for low-impact on the landscape and rainwater attenuation, feeding a reedbed and pond to treat the water • Effective car park lighting with minimum impact on surrounding landscape and wildlife habitats, and optimised energy use
• Landscaping with extensive planting of indigenous trees to complement local flora and habitats, and a layout to accommodate the existing trees • Provision of bat and bird boxes to encourage colonisation within the site. The project utilised 14,000 square metres of CBPP for circulation, parking and pedestrian areas, and local conditions allowed for a ‘System A’ form of construction with total infiltration of surface water to the ground. Here, all rainwater falling on the CBPP, and adjacent impervious areas draining onto it, infiltrates through jointing material, the constructed layers below and eventually into the subgrade. This effectively eliminates the requirement for additional drainage systems whilst also recharging the natural groundwater. Recent performance tests at the Martlesham Park and Ride replicated a 20-year in-service lifespan and demonstrated that the stability of the surface remained with CBPP construction. In addition to the CBPP, some 1,400 square metres of impermeable block paving for bus access areas and 1,300 square metres of flag paving for pedestrian areas were also installed. KEY POINTS This is a substantial and impressive example of CBPP forming part of a completely sustainable facility aiming for minimal impact on the local environment. At the same time, the large area of total infiltration (System A) permeable pavement does not need to form part of a SuDS ‘management train’ and operates in isolation. The project clearly shows: • Elimination of traditional drainage components including pipes, gullies and soakaways • Potential for total cost savings over other pavement types, including asphalt with traditional drainage • Maintenance of stability of CBPPs under traffic and in different applications • Ability for CBPP to replicate original drainage before intervention, therefore minimising impact on the environment • Compliance with planning guidance (PPG25) and the Building Regulations, requiring local infiltration wherever possible. Material reproduced with kind permission of Interpave (The Precast Concrete Paving and Kerb Association) www.paving.org.uk
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CCANZ Library Listed below is a small selection of recently acquired material by the CCANZ library. email library@ccanz.org.nz TO BORROW. TADAO ANDO: HOUSES BY PHILIP JODIDIO The most complete and comprehensive collection of residential projects from the world’s most internationally recognized and renowned architect. Though prolific in civic and commercial work, Tadao Ando first gained recognition for his residential projects, which were constructed solidly of concrete but ingeniously imbued with light and air.
APARTMENT DESIGN GUIDE
This exhaustive study is a complete catalog of all his residential work to date, including two new homes just finished in 2013. It also features unseen and unpublished works presented through lavish and striking colour photographs as well as detailed architectural drawings and plans of over thirty years of Ando’s residential work. OPUS C – CONCRETE ARCHITECTURE & DESIGN 2014 Besides the many technical developments that have made concrete a high-tech material in the past few decades - ultra-high performance or self-compacting concrete, to name but two - concrete possesses an expressive and strong characteristic that particularly distinguishes it from other materials: its endless formability. This second volume 2014 edition of opus C - Concrete Architecture & Design presents a beautiful collection of fine new projects that demonstrate the creative and functional versatility of this most modern building material.
Library Quiz To go in the draw to win a copy of Tadao Ando: Houses by Philip Jodidio answer the following simple question: What architectural practice won the Excellence in Residential Concrete Construction category award at the 2013 Concrete3 Sustainability Awards? Email your answer to library@ccanz.org.nz. Entries close Friday 31 January 2014.
The CCANZ Apartment Design Guide sets out key considerations, and provides recommendations on size, daylight and interior climate requirements, along with effective soundproofing and fire protection. Email admin@ccanz.org.nz to request your FREE copy of the Apartment Design Guide
Congratulations to Nic Brooke of Compusoft Engineering Ltd, who correctly answered the Vol 56 Iss 3/4 Library Quiz to receive a copy of Concrete Planet: The Strange and Fascinating Story of the World’s Most Common Man-Made Material by Robert Courland.
www.ccanz.org.nz
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News from the Associations CONTACTS New Zealand Ready Mixed Concrete Association Ph (04) 499 0041 Fax (04) 499 7760 Executive Officer: Adam Leach 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: Mario Fontinha www.nzcma.org.nz Precast NZ Inc. Ph (09) 638 9416 Fax (09) 638 9407 Executive Director: Rod Fulford President: Paul Cane 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: Carl Ashby www.concretesociety.org.nz New Zealand Master Concrete Placers Association Ph (07) 575 3214 Fax (07) 575 3618 Email: office@mcpa.org.nz www.mcpa.org.nz
NEW ZEALAND CONCRETE SOCIETY (NZCS) A TRIUMPHANT 2013 CONFERENCE Attracting 320 delegates plus 70 partners the 2013 Concrete Industry Conference in Queenstown was a resounding success. The technical programme met a vast range of relevant topics, while Queenstown turned on excellent weather to ensure the social activities were well supported. The Concrete Society thanks patrons: Golden Bay Cement, Holcim (New Zealand) Ltd, and Sika (NZ) Ltd; the sponsors: Winstone Aggregates, Technical Welding Services, Complete Reinforcing, Firth Industries, Opus International Consultants Ltd, Gough Engineering, Grace Construction Products, and Pacific Steel Group, and acknowledges the support of businesses which chose to have trade exhibits. If you’d like to see more of the conference, photographs can be downloaded from http:// bluepacificevents.com/gallery NEWMARKET VIADUCT TAKES NZCS CONCRETE AWARD Announced at the gala conference dinner in Queenstown on Friday, 4 October, the complex deconstruction and reconstruction of Newmarket Viaduct won this year’s premiere Concrete Award. NGA Newmarket Alliance representative Ted Polley says working on the Newmarket Viaduct Replacement Project was a rewarding and technically challenging experience. “It is considered one of New Zealand’s premier projects and has been recognised internationally, winning at the World Demolition Awards in Amsterdam in 2012 and a merit at the FIDIC Awards which celebrated the best engineering achievements globally in the last century.” The judging panel said the NGA Newmarket Alliance, which included structural engineers Beca, URS, Tonkin & Taylor and Boffa Miskell, and contractors Leightons, Fulton Hogan and VSL, can be proud of their achievements. “The project involved significant and advantageous use of concrete – with a massive overhead launching gantry vital to both operations,” said the judges. “The focus was on replicating what was there with an enhanced structure with minimum disruption. This was achieved in spades – delivering world-firsts on the way.” Infrastructure Award - Commended: Lower Hatea River crossing in Whangarei. The 265m long road bridge is modelled on the Maori fish hook, and was acknowledged for its innovative design. Monte Craven Architectural Award: Point Resolution Taurarua footbridge in Auckland. This striking and memorable landmark, as much sculpture as structure, is elegant, clever and unobtrusive. Landscaping Award: Hurstmere Green in Takapuna. A community park in which concrete has been used in a variety of forms, textures and surface finishes creating a myriad of features. Residential Award: Firth RibRaft TC3 Flooring System. Developed following the Canterbury earthquakes this cost effective flooring system can be jacked and re-levelled after an earthquake. Residential Award - Commended: ‘Coming Home to Concrete’. This multi-media campaign raised awareness of the advantages of concrete in residential construction. Technology Award: Allied Concrete Weather App. This innovative smartphone tool can help manage the risks associated with deciding whether to proceed with a concrete pour. Technology Award - Commended: ArchEng Student Workshop. This initiative encourages aspiring construction specialists to work together to incorporate the best insights and latest technology into a concrete based design.
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