Sika products were recently specified at an emergency restoration project on the Carlton Centre in Johannesburg.
Designed by the American architectural firm Skidmore, Owings and Merrill, Anglo American Properties began construction on the majestic Carlton Centre in Johannesburg’s central business district during the late 1960s by demolishing the old Carlton Hotel and closing the roads to form a city superblock. The 50-storey high building was officially opened in 1973 at a total cost of over R88 million. Forty years later, the centre is still the tallest building on the African continent.
In 2012, SMEC Vela VKE Consulting Engineers recommended that an emergency restoration project should be initiated after a single piece of debris had apparently fallen onto the roof of a steel-framed structure to the west of the Carlton Centre. Products from Sika’s Concrete Repair and Protection System were specified, given their durability and cost-effectiveness.
SikaTop-Armatec 110 EpoCem, a cement-based, epoxy-modified, three-component, anti-corrosion coating and bonding agent, was used in conjunction with Sika Rep LW, a one-component, non-sag, cement-based, multi-purpose patching and repair mortar.
Cracks in the concrete were repaired with Sikadur-31 CF Normal, a moisture-tolerant, thixotropic, structural two-part adhesive and repair mortar based on a combination of epoxy resins and special fillers.
Sika FerroGard-903+, the fourth product in the repair and protection system, was applied to treat the entire top ream of the Carlton Centre. This treated area, located on the 50th floor, covers the 360o observation deck, known as the “Top of Africa”.
Complying with principle 11 of EN 1504-9 method 11.3, Sika FerroGard-903+ protects both cathodic and anodic zones of reinforced steel. It does not change the appearance of the concrete structure and does not alter the water vapour diffusion properties of the concrete.
The efficient, quality and workable nature of the Sika products used in the concrete repair and protection programme ensured that, despite the often adverse weather conditions, contractors were able to complete the project within the specified time schedule.
Sika is justifiably proud to be chosen to supply its state-of-the-art products to restore and protect an important South African landmark.
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