Cement pavement is not based on 20 plus or minus 2 degrees, but the temperature is not lower than 0 degrees and will not freeze. If it freezes, it is easy to expand and destroy the pavement, because the concrete label is not up to standard, it is not completely dry, and there is enough water in it. However, if the temperature is too high and the hydration speed of cement is too fast, the surface will lose water in an instant or in a short time, which is easy to produce shrinkage cracks. Generally, the cement will be completely solidified after one day, and the temperature is high, so it needs to be cured by spraying water.