Double decker rehabilitation creates safety and jobs

The Johannesburg Roads Agency (JRS), in their commitment to provide quality roads that are accessible and safe, decided it was time for one of its major bridges to be rehabilitated. The M1 “double decker” is a highway bridge in Johannesburg, between Newton and Fordsburg, which posed a safety threat to motorists.

Sika

This R15 million rehabilitation project, with a bridgespan of 1.02 km, was no small task and required the expertise of many specialists. Khato Civils were appointed as the main contractor for the project and assisted by 17 small, medium and micro enterprises. A phenomenal number of 164 people were employed on this rehabilitation process.

A well-known construction chemicals supplier, Sika, reports that its product range was Khato Civils’ brand of choice because of its reliability and long life.

Trestle-like piers The bridge consists of two reinforced concrete deck superstructures, one directly above the other, that are supported on trestle-like piers. A variety of the company’s products were specified for structural repairs, structural strengthening and coatings. SikaTop Armatec-110 EpoCem was used as a rebar protective coating in the structural repairs as it is highly effective for corrosion prevention in concrete reinforcing. Also used in the repair process were the supplier’s user-friendly Monotop-615

HB, which is designed for thick layer concrete repairs, especially for overhead and vertical applications, as well as the SikaGrout-212.

For structural strengthening of reinforced concrete structures, and to increase sheer load capacity, SikaWrap-300 C was used. The concrete surface area was treated with Sikaguard-705 L silane water repellent and SikaTop Seal-107, a polymer modified cement waterproof and chloride and carbonation resistant, liquid applied membrane coating for concrete.

City of Johannesburg’s M1 bridge, repaired with smart construction chemicals.

On-site support To ensure that all product applications were executed correctly at every stage, all those involved in the project were provided with training and on-site support by the supplier’s support team. This included training in processes such as surface preparation, product mixing and product application.

A major challenge to all involved was that the motorway was used daily by traffic. As disruption to traffic had to remain limited, it was anticipated that it would be difficult to complete the task within the allotted 22-month time frame. However, with the use of superior, tailor-made products and the appointment of a committed contractor, the project was completed three months ahead of time.

The mayor of Johannesburg at the time, Herman Mashaba, expressed his main concern and priority was the safety of motorists. Mashaba visited the site during the works and was pleased with the progress.

Roads and bridges form a critical part of the transport infrastructure, especially in a growing city, so their maintenance and rehabilitation are important. Now complete, the mayor and all road users can rest assured that the best possible rehabilitation practices were employed on the project and that the “double-decker” has a firm foundation for the future.

Acryl-W - 2 in 1 gap fi ller and cornice adhesive

Acryl-W is an acrylic sealant for interior and exterior use with good adhesion to many materials. Paintable with emulsion paints, freeze resistant and not corrosive towards metals. Conforms to the SNJF-standard. Exterior application to be painted with a good quality synthetic paint. After curing Acryl-W is weather and rain resistant. Low VOC.

Colours: White, grey and beech

Cartridges of 280ml and 4kg bucket.

Application For sealing cracks and joints where moderate amounts of movement can occur (max.12,5%). Not suitable for joints exposed to continuous water immersion.

FireProtect ® FP Acrylic Sealant

FireProtect ® FP Acrylic Sealant is a one-component, low VOC, fully certifi ed acrylic based passive fi re retardant for creating compartments in constructions for the prevention of the spread of fi res, gases and smoke between compartments, to meet legal requirements. FireProtect ® is almost odour free and non-corrosive towards metals. Will show good adhesion without a primer on building materials like concrete, brickwork, painted wood, anodised aluminium and uPVC.

Cartridges of 310ml

Application FP Acrylic is designed for the fi re sealing of indoor joints in commercial buildings & offi ces, industrial warehouses, factories, hotel rooms, ships. Tested for fi re resistance until 240 min in 20mm joints, as per fi re test certifi cation EN 1366-4. Perimeter pointing around door and window frames, concrete and brickwork. Joints between walls and ceillings, and joints around pipes and cable work.

Silicone-1001U Professional

Silicone-1001U Professional is a high quality, low VOC, ready-to-use elastic sealant, based on acid curing with very good adhesion to many surfaces. Excellent UV and weather resistance.

Colours: Clear, white, grey, black, bronze, aluminium

Cartridges of 300ml

Application Sealing joints around buildings, industrial and fenestration applications.

Do it right... the fi rst time Do it right... the fi rst time Silicone-NO

Silicone-NO MF/T is a high quality, low VOC, neutral curing fungal resistant, durable and elastic sealant with excellent adhesion on many surfaces (without primer). Has good UV and weather resistance. Silicone-NO complies with international standards.

Colour: Black, white, grey,bronze,light bronze and clear as well as MT - matt transparent

Cartridges of 300ml

Application For sealing joints where mildew is undesirable. Suitable as a perimeter and weather sealant. For sealing joints in glazing systems, buildings and general construction industry. Not suitable for use on mirrors or natural stone.

Sili-Kill - Removes old sealant

FireProtect ® FP Silicone Sealant

FireProtect ® FP Silicone Sealant is a one-component, low modulus silicone sealant for creating fi re retardant joints to compartmentalize fi re zones to prevent the spread of fl ame, gases and smoke between compartments. FP Silicone Sealant is a neutral sealant which is almost odourless, forming a fi re resistant seal after application. May be used without primer to seal assemblies of glass, laminated glass, glazed surfaces, aluminium and many other metals, unplasticised plastics, polyester, polystyrene and most uPVC, painted wood, concrete and brickwork.

Cartridges of 310ml

Application Fire retardant expansion and joint sealing to precast concrete, brickwork and masonry. Fire retardant perimeter pointing and curtain wall sealing. Sealing fi re retarding glazing systems and cap beading. Sealing joints where spreading of fi re, smoke, or toxic gases is undesired. Suitable for fi re sealing of joints in commercial buildings, offi ces, industrial warehouses, factories, hotel rooms, shopping malls and ships. Tested for fi re resistance up to 240 minutes in joints up to 40mm wide. Tested to fi re test certifi cation EN 1366-4

Hybrifl ex-540

Hybrifl ex-540, a convenient one-component, non bubbling, moisture curing, low modulus sealant and adhesive. Free from isocyanates, silicones and solvents. Excellent adhesion to most substrates. Highly resistant to ageing and weathering. Hybrifl ex-540 is environmentally friendly, low VOC and easy to use.

Colours: White, beige, grey, black

Cartridges of 300ml and 600ml

Application As a specifi c sealant for expansion joints between building structures, and around uPVC window frames. For sealing joints (inside and outside) in concrete, natural stone, asbestos, wood, enamelled surfaces, steel and aluminium. For use with Polyethylene Backing Cord.

High-Tack - Instant high grip permanent adhesive

High Tack is a high quality, strong one component adhesive, with very high initial grip and tack based on MS Polymer. Will not stain natural stone products.

Cartridges of 290ml

Application Instant tack and gluing of panels, skirting boards,windowsills, natural stone, thresholds, mirrors and isolating materials. In coach-work and metal connecting joints. Gluing in shipbuilding industry and almost everything else. Instant grip of weights up to 20kg vertically - without mechanical support

Fix-O-Chem

Fix-O-Chem is a fast curing, single component, low VOC chemical fastener. It is ideal for use instead of plugs or expansion anchors. No pressure build up unlike expansion anchors. Not recommended for continuous water immersion. Temperature resistance of up to +80°C.

Cartridges of 300ml

Application As a chemical anchor for wire rods and screws in massive and hollow surfaces such as concrete, aerated concrete, brickwork and hollow stones. For solid fastening of window frames, roller blinds, banisters, hinges, etc. in building constructions. Also as a synthetic repair mortar for concrete.

Mirrorfi x-MS - The only adhesive specifi cally designed for use on mirrors

Mirrofi x-MS is a low VOC adhesive based on SPUR technology. For gluing mirrors. Consult our guide on gluing mirrors.

Cartridges of 310ml

Application For adhering mirrors.

Woodfl exWoodfl ex

Woodfl ex is a solvent-free sealant and fi ller for sealing and joining of parquet, cork, laminate as well as for wooden fl oors and joinery. Available in 6 different colours suitable on all typical woods. The sealant has excellent adhesion qualities, is fast drying and may be sanded and painted.

Colours: Oak, beech, pine, cherry, meranti, imbuia Cartridges of 300ml

All Round Sealant

All Round Sealant is a paintable, solvent based plastic elastic sealant and is fungal resistant. Universal sealant based on synthetic rubbers with good adhesion properties. Can be used on damp non-porous surfaces.

Colours: White, clear

Cartridges of 280ml

Application A versatile sealant for sealing joints, repairing small cracks and for bonding. Can be applied even under moist conditions.

PU Foam

Construction PU Foam is a one component fast curing construction foam based on moisture curing polyurethane. It has a strong dense cell structure with excellent gap fi lling capability. Precise application with the NBS applicator option. is a one component fast curing construction foam based on moisture curing polyurethane. It has a with excellent gap fi lling capability. Precise application with the NBS applicator option.

PU Foam Cleaner is a cleaner that dissolves uncured PU Foam and is required for cleaning out the NBS applicator. is a cleaner that dissolves uncured PU Foam and is required for cleaning out the NBS applicator.

FireProtect ® FP PU Foam is a fi re resistant, one component polyurethane foam curing by atmospheric moisture. For use in areas where fi re resistance is required.

Application PU-Foam can be used in joints between separation walls, ceilings and fl oors. Perimeter joints around window and door frames. Filling cavities carrying pipes, cables or transits in walls and ceilings. FP PU Foam offers fi re resistance up to 4 hours combined with other FP products. For use with Polyethylene Backing Cord. around window and door frames. Filling cavities carrying pipes, cables or transits in walls and ceilings.

The Den Braven difference!

Johannesburg - 2 High View Boulevard, High View Business Park Ferndale Ext 26, 2194 tel: 011 792 3830 fax: 011 793 4266

Durban - Unit 1, 22 Beechfi eld Crescent, Springfi eld Park, 4091 tel: 031 579 2375 fax: 031 579 4070

Cape Town - Unit 2, Linpark, 17 Longclaw Drive, Montague Gardens, 7441 tel: 021 552 9674 fax: 021 552 9678