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Heat of Hydration (IS 4031-1968) of Cement
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Heat of Hydration (IS 4031-1968) of Cement

Hydration of cement is chemical reaction and it produce heat . In very massive construction this effect can rise the temperature of concrete as much as 50°C . In such cases , we should use low heat cements or adopt cooling method.

The test is carried out by calorimeter. Low heat cement should satisfy following criteria

In 7 days, heat generated should not be more than 65 calories/gm of cement.
In 28 days, heat generated should not be more than 75 calories/gm of cement.
Cements do not generate heat at constant rate as illustrated in Figure for a typical Portland cement.

[Image: heat.jpg]
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