Gateway Theatre of Shopping is situated in Umhlanga on the KwaZulu Natal coast just north of Durban. It has been described as both the largest shopping centre in South Africa and the largest in the southern hemisphere and it was here at a motoring showroom that Sika CarboDur BC Rods were used for the first time in South Africa. Sika’s Warren McDaniel advised on the product requirements.
Due to an expansion project at Hyundai Gateway, the building requirements had changed; additional structural strengthening on the existing slabs had become a necessity. Sutherland Consulting Engineers had no hesitation in specifying internationally approved Sika CarboDur Plates together with Sika CarboDur BC Rods.
Designed for strengthening concrete, timber and masonry, Sika CarboDur Plates are pultruded carbon fibre reinforced polymer (CFRP) laminates that are bonded onto the structure as external reinforcement. Manufactured in rolls of 100m, the product can be cut to varying lengths so that no joins are required. These laminates require minimal preparation while numerous sizes of high strength plates are available with three different modulus of elasticity: Standard, Medium and High.
Sika CarboDur BC Rods, also pultruded carbon fibre reinforced polymer (CFRP) laminates, with a circular cross section, are used as part of a Sika CarboDur system. They are bonded into slots as near-surface mounted reinforcement for concrete, timber and masonry. The rods are especially useful when a slab has poor surface quality, as the need for high surface tensile strength is negated by embedding the rods into the concrete. Sika CarboDur BC Rods are used to improve, increase or repair the performance and resistance of structures for flexural strengthening for positive and negative moments, flexural strengthening of columns under axial load, shear strengthening of beams and strengthening of masonry walls. Due to their confinement and bond, Sika CarboDur BC Rods are completely anchored with short anchorage lengths.
Warren McDaniel explains: “For this project, 164m of Sika CarboDur Plates S512 (50mm x 1.2mm) and 75m of Sika CarboDur Plates S1012 (100mm x 1.2mm) were bonded to the soffit of the slab while the Sika CarboDur BC Rods (35 x 3m) were bonded into the surface of the slab. The bonding agent used for both products was Sikadur-30, a thixotropic, structural two-part adhesive based on a combination of epoxy resins and special filler, and designed to be used at temperatures between 8oC and 35oC.” Freyssinet Mndeni was contracted for the application of these Sika products.
Both Sika CarboDur Plates and Sika CarboDur BC Rods are used in a wide variety of applications, e.g. for increased load bearing capacity, for repairs to structural damage, for service improvements or to rectify design or construction defects. These lightweight, non-corroding, products are highly durable with outstanding fatigue resistance and are very easy to install. Sika CarboDur BC Rods provide resistance to possible catastrophic events such as explosions and earthquakes.
Sika South Africa is confident that this project is the first of many more necessitating the application of world-renowned Sika CarboDur BC Rods.
For more information on Sika products and systems, visit www.sika.co.za