Abstract
In anticipation of forthcoming European standards the early hydration behaviour of cements containing 5% mineral additions has been studied at 20°C using conduction calorimetry. The separate additions by blending of 5% pfa, slag and the clay minerals, kaolinite and illite have no significant effect on the time of appearance of the main heat evolution peak. Variations are obserbed in the hydration of the Portland cements with different calcite additions. The addition of 5% lias to OPC can retart the main heat evolution peak. However, the addition of cement rawmeal by intergrinding accelerates the hydration of the Portland cement and increases the peak rate of heat evolution. Rawmeal and kaolinite additions when introduced by blending reduce the peak rate. Differences in the behaviour of the two rawmeal additions are briefly discussed.
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