Abstract
The effect of different concentrations of alkali metal hydroxide and sulphate solutions on the setting behaviour of ordinary Portland cement (OPC) and the compressive strength of mortars aged up to three months is studied. Potassium hydroxide solution has the greatest negative effect on the properties studied; around 35% reduction in the final setting time and late strength are attained by mixing with 1 M KOH. Solutions of potassium sulphate also cause a greater strength lowering than the sodium salt. The mechanism of setting is interpreted on the basis of the results obtained from the hydration reaction of pure cement system.
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