08-08-2014, 11:11 AM
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]](http://www.frontdesk.co.in/big/cm/heat.jpg)
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.