Having had minimal repairs carried out over the past 35 years, Stellenbosch University’s Faculty of Medicine and Health Science’s facilities on the Tygerberg Campus was in dire need of a facelift. The multi million rand renovation contract was awarded to Drake & Scull Facilities Management and works were carried out by The Construction Co.

Work on this Cape Town building commenced in July 2011 and Sika was top choice of the contractor to supply its innovative products for all concrete repairs and joint sealing. This specification was later extended to include all plaster repairs and dowelling epoxy applications.

SikaTop-Armatec 110 EpoCem, a cement-based, epoxy-modified, three-component product was applied as a coating and bonding agent. Providing excellent adhesion to steel and concrete this anti-corrosion coating results in a high degree of mechanical strength and provides an excellent bonding coat for subsequent applications of repair mortars.

Sika Monotop-615 HB, with its excellent workability characteristics and adjustable consistency, was used for all concrete repairs. This high build cementitious, polymer-modified repair and reprofiling mortar contains silica fume, and is designed for thick layer concrete repairs. Its excellent thixotropic behavior makes it ideal for overhead and vertical applications and it is sprayable by the wet spray method. It provides good mechanical strength as well as resistance to water and chloride penetration.

The sides of all expansion joints were prepared with Sika Primer-3N, a one-component, easy to apply, epoxy-polyurethane solvent based primer, suitable for use on all porous substrates. Sealing around windows and on expansion joints was accomplished by applying Sikaflex AT-Façade, a one-part, ready-to-use, high performance, elastic joint sealant based on silicone terminated polymers. Providing 25% movement capability, it is ideally suited for sealing movement and connection joints on porous and non-porous substrates and provides excellent weatherability with the highest UV resistance. To date, joint sealing on the project has required 7000 x 600ml sausages of Sikaflex AT-Façade.

The largest phase of the hospital rehabilitation entailed plaster repairs to the old Terrazzo. SikaLatex, a high quality, synthetic polymer emulsion for adding to cement mortars was used in this application. An excellent water resistant bonding agent, SikaLatex provides increased adhesion strengths, reduced shrinkage, and increased abrasion resistance.

However, once engineers realised that the repaired plaster was resulting in an extremely thick finish, the spec was altered to anchor the plaster onto each panel. Six stainless steel 120mm anchors were used per panel in conjunction with 2850 x 300ml cartridges of Sika Anchorfix-1, a solvent- and styrene-free, two-part, polyester-anchoring adhesive.

With Sika’s reliable and long lasting products being used on this extensive project, the Tygerberg Campus of the University of Stellenbosch Medicine and Health Science’s facilities will unlikely need another facelift for quite some time.