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These are original scientific papers published in Concrete Beton, journal of the Concrete Society of Southern Africa. Note that full copyright of this publication belongs to the Concrete Society of Southern Africa NPC. Journal Contact Details: PO Box 75364 Lynnwood Ridge Pretoria, 0040 South Africa +27 12 348 5305 This email address is being protected from spambots. You need JavaScript enabled to view it., website www.concretesociety.co.za