Despite being in a remote bushveld environment called Koedoeskop in the Limpopo Province, Mamba Cement was the first cement company to implement a waste heat recovery system. The company needed maintenance on some of its silos late last year; and Teichmann Contractors and BSM Baker Consulting Engineers were selected to carry out the job, which was completed in only a month.
The main challenge that the project team had to overcome was extremely heavy rains during the project, which made site access and operations challenging at times. While this led to some delays, the use of Sika products to repair the silos was a good choice as these products can withstand bad weather.
Structural repairs were done using the Sika MonoTop®-412 NFG, which is suitable for structural repairs and preserving or restoring passivity to the rebar. A total of 94m of cold joints and cracks on the structure were repaired by means of crack injection, using a low viscosity epoxy Sikadur®-52 ZA. This epoxy has shrinkage-free hardening, which is suitable for both dry and damp conditions. It is also solvent free and can be used at low temperatures.
Lastly, the top of the silo was waterproofed with the reputable Sikalastic®-152 and a 4mm x 4mm alkali-resistant coated glass mesh fabric, to add resistance to moving cracks. This aesthetically pleasing waterproofing product affords an extremely easy application process and is flexible and durable.
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