Two coal-storing silos at the Dishaba Platinum Mine in Limpopo were structurally strengthened using Sika’s carbon-fibre structural strengthening system, Carbodur.
Sika CarboDur M consists of pultruded carbon-fibre reinforced polymer (CFRP) laminates that are a combination of standard or high modulus (high stiffness), are non-corroding and provide excellent durability.
To bond these plates onto the silos, Sikadur-30, a structural two-part adhesive, was used. Designed for use at normal temperatures, it is easy to apply, with no primer required. It provides excellent adhesion, high creep resistance under permanent load, as well as high initial and ultimate mechanical resistance. It hardens without shrinkage and is impermeable to liquids and water vapour.
Upon completion, Teichmann Structures has bonded 950m of Sika CarboDur M614 (60mm wide x 1,4mm thick) laminates onto the silos.
As a final protective coating, Sikagard-550 W Elastic, which is available in various shades, was applied. Based on ultraviolet (UV) curing acrylic dispersion, with excellent crack-bridging properties, it provides high diffusion resistance against CO₂ as well as high resistance to weathering. Solvent-free and water-vapour permeable, Sikagard-550 W Elastic has a reduced tendency to dirt pick-up and contamination.
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Sika CarboDur M614 laminates were bonded onto two silos at the Dishaba Platinum Mine for structural strengthening.