Plastic Shrinkage Cracking

Plastic shrinkage cracks usually occur in exposed concrete where the evaporation rates approach 0.20 lbs./square foot/hour. This computer program determines the rate of evaporation when air temperature, relative humidity, concrete temperature, and wind velocity are inputted. Once the rate of evaporation is known, the program recommends if precautions against plastic shrinkage cracking are necessary on this particular day with these circumstances.

Rate of Surface Evaporation Today:

Precautions against plastic shrinkage cracking are