n IMIESA - Five costly housing errors to avoid - cement & concrete

Volume 45 Number 1
  • ISSN : 0257-1978


Using the correct mix proportions and ensuring good site practice affect the strength, durability and economy of the finished concrete. “First, the quality of the cement is crucial,” stresses Bryan Perrie, managing director of The Concrete Institute (TCI). “This is particularly important at present, when tonnes of imported cement of questionable quality are arriving at our ports. “Building contractors should note that all producers and importers of cement must have a Letter of Authority (LoA) from the National Regulator for Compulsory Standards (NRCS) for each different cement type sold in South Africa. The NRCS issues an LoA only if the cement standard complies with the required South African standards,” he explains. The validity of an LoA can be checked with the NRCS.

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