Author(s) :

M. M. Garba, M. A. Tahir.

Volume/Issue :

Abstract :

This is a report on experiments carried out to compare the sulphate resistance of sand mortar made with five different pozzolanic Cements. The pozzolanic Cements were prepared by blending powdered burnt bricks from the Adamawa, Makurdi, Kano, Kaduna, and Niger brick factories with Ordinary Portland Cement in the ratio 1:4. Sand-pozzolanic Cement mortars of mix ratios of 1:6 and 1:3 with water-cement ratios of 0.65 and 0.4 respectively were used to prepare cubes and bars specimens. 150 mortar cubes of size 70mm x 70mm x 70mm and 32 mortar bars of 15mm x 15mm 100mm dimensions were cast and cured for 28 days. The cured specimens then immersed in the solutions of K2SO4, (NH4)2SO4 and water for 28 days and then tested. The compressive strengths of cubes in water increased by 34% while those in the sulphate solutions decreased. Strength decreases of the cubes, cracking and warping of bars immersed in K2SO4 were less than those in (NH4)2 SO4. Specimens made with Niger and Makurdi pulverized burnt bricks experienced less effect of the sulphates and can therefore be used as pozzolan in mortar and concrete to resist sulphate.

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