Calcined clay pozzolan, produced by CSIR-BRRI, class 32.5R Portland limestone cement (PLC) manufactured by Ghana Cement Company Limited (GHACEM) were used for the research. To satisfy the conditions for the occurrence of ASR, silica glass, a known reactive aggregate [21] [22] , obtained from crushed pyrex laboratory glassware were used for the research. Particle size of the silica glass ranged between 0.15 - 0.60 mm. The chemical composition of the pozzolan and PLC were evaluated using a SpectroXlab 2000 X-Ray Fluorescence spectrophotometer. Bulk densities of the pozzolan and PLC were determined according to methods in BS 1377 [23] whilst the respective Blaine indices were obtained according to ASTM C 204 [24] .