—Durability of mortar/concrete is a vital property that affects its serviceability. One of the factors that affect concrete durability is sulphate attack, which can result to expansion, cracking, deterioration, and deformation of concrete structures. The effect of a modified pozzolan (PWC) on the sulphate attack resistant of mortar was investigated in this study. The additive, a blend of selected alkaloids and zeolite, is commercially available and effectively used in soil stabilization for road construction. The additive pozzolanic behaviour had been observed in previous study in terms of strength and permeability. However, the present study focuses on its resistant to sulphate attack as a pozzolan. PWC additive was used in the proportions of 0 %, 0.4 %, 0.6 % and 2.5 % by weight of cement. Samples were subjected to both internal and external sulphate attack tests, according to ASTM C1038 and ASTM C1012 respectively, after being cured for 14, 28, 60, 90, 120, 180, and 295 days. The results showed that PWC additive when used at low dosages of 0.4 % and 0.6 % PWC causes reduction in expansion due to external sulphate attack. At higher dosages of PWC additive, greater external expansion occurs when compared to control samples.
—Durability, expansion, modified pozzolan, mortar, resistant, sulphate attack.
Durability, expansion, modified pozzolan, mortar, resistant, sulphate attack.
Cite: Bolanle D. Ikotun and Adeshina G. Ikotun, "Effect of a Modified Pozzolan on the Sulphate Attack Resistant of Mortar," International Journal of Engineering and Technology vol. 6, no. 1, pp. 55-59, 2014.