Abstract
Effect of CaCl 2 on the hydration characteristics of the different cement pastes using ordinary Portland cement (OPC) and blended Portland cement with ground clay bricks (GCB) was studied. Various mixes were prepared using a water/solid ratio (W/S) of 0.25 (by weight). Three percentages of CaCl 2 (0.25, 0.5 and 0.75%) are used; the CaCl 2 used was dissolved in the mixing water. The hydration characteristics were tested via the determination of the combined water content, phase composition, compressive strength, total porosity ( P %) and X-ray diffraction analysis (XRD) at different time intervals up to 180 days. The results showed that calcium chloride accelerates cement hydration in all systems studied. Ten % GCB in the presence of 0.50% CaCl 2 is the optimum ratio which has the higher compressive strength.
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