Can you quote a reliable general figure for the specific heat of concrete? This is required to assist in calculating the temperature needed for mixing water to raise the temperature of concrete during cold-weather placing.
Accepted coefficients for specific heat (that is the amount of heat required to raise the temperature of 1 gram of concrete by 1 degree C.) range from 0.20 to 0.25 calories per gram, the lower figure being for concrete in the just-hardened state. It must be pointed out however that the precise figure for specific heat will mainly be dependent on the type of aggregate used; other factors having a lesser significant influence are the mix proportions, density, water/cement ratio, type of cement, and the initial temperature of the concrete.