Steam curing of concrete can be divided into four stages: static stop, heating, constant temperature and cooling. The principle of concrete steam curing is as follows:

1. During the static stop, the ambient temperature should be kept at not less than 5 degrees Celsius, and the temperature of concrete can only be raised after pouring for 4 to 6 hours.

2, the heating rate should not be greater than 65438+/-00 degrees Celsius per hour.

3. During constant temperature, the internal temperature of concrete shall not exceed 60 degrees Celsius, and the maximum temperature shall not exceed 65 degrees Celsius. Constant temperature curing time should be determined by experiments according to the demoulding strength requirements of components, concrete mixture ratio and environmental conditions.

Steam curing concrete is a kind of lining curing which is realized by covering the lining surface of fresh concrete with steam prepared by boiler. The temperature and humidity required for the hardening of concrete materials are mainly provided by hot steam, which is suitable for the lining construction of holes and necks in cold regions in winter.