Effect of Some Industrial Wastes on The Physico-Chemical and Mechanical Properties of Hardened Cement Pastes

Abstract

Blended cement are made by the partial replacement of ordinary Portland cement by siliceous materials such as silica fume, blast furnace slag and CKD such blending materials modify the strength, pore structure and permeability of the hardened cement pastes. Sulphate attack on hardened cement pastes causes a serious deterioration. The damage usually starts at edges and followed by cracking of cubes. Magnesium sulphate has a more damage effect than other sulphates because it leads to the decomposition of the hydrated calcium silicate as and hydrated calcium aluminates. Therefore, the aim of this investigation is to study the physicochemical and mechanical properties of some hardened blended cement pastes by examining the hydration characteristics of various mixes as well as magnesium sulphate attack. The effect of the additives such as silica fume, blast furnace slag and CKD was examined. Different mixes were prepared with various ratios of additives and cured in water for various times (1-7-28-180-360 days) of