Abstract
Kaolins with fairly well crystallized kaolinite as the main component were calcined at respectively 550, 650, 800 and 950°C for 100 minutes. Both the raw and calcined samples, before and after being mixed with either ordinary Portland cement or with Ca(OH) 2 or after extended immersion in the simulated cement paste pore solution saturated with Ca(OH) 2, were studied by DTA (for raw kaolin), XRD, SEM and EMPA. The compressive strength, chemical shrinkage and alkali and acid solubility of samples were also investigated. The optimum calcination temperature from the combined scientific and economic standpoint is 550°C, corresponding to the culminating point of kaolinite dehydroxylation.
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