Plastic shrinkage cracks occur when the surface of the concrete dries rapidly and shrinks before it can gain sufficient tensile strength to resist cracking.
When ambient conditions & temperatures combine to produce conditions that create a high evaporation rate; the chances of the surface drying and shrinkage cracks forming increases.

Using this tool, you can quickly calculate the evaporation rate based on
• concrete temperature
• air temperature
• relative humidity
• wind velocity