Surface Evaporation

 

Listed below is a graph from ACI 305 R which calculates the rate of evaporation. The primary cause of shrinkage cracks in concrete is when the rate of evaporation approaches 0.20 lb./sq.ft./hr or higher. Wind velocity, relative humidity, air temperature, and concrete temperature can be plotted on this graph to predict when plastic shrinkage cracking will occur and when EVRT should be employed.

EVRT EVRT-C