What is the effect of concrete placing temperature on early thermal movement?

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The rate of hydration of cement paste is related to the placing temperature of concrete. The rate of heat production is given by the empirical Rastrup function:

H= H_ox 2^r(T-T1)

H_o = Rate of heat production at a reference temperature
T = Temperature where rate of heat production H
T1 = Temperature where rate of heat production H_o
r = 0.084

An 12^oC increase in placing temperature doubles the rate of reaction of hydration. Hence, concrete placed at a higher temperature experiences a higher rise in temperature. For instance, concrete placed at 32^oC produces heat of hydration twice as fast when compared with concrete placing at 20^oC. Hence, high concrete placing temperature has significant effect to the problem of early thermal movement.

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