1. Static stop stage: refers to that the concrete is placed at normal temperature for a period of time from the completion of pouring to the heating stage, mainly to enhance the ability of concrete to resist structural damage during the heating stage, and the temperature needs 2~6h.

2. Heating stage: that is, the initial temperature of concrete rises to a constant temperature stage. Due to the rapid volume expansion, the rapid temperature rise will lead to cracks on the concrete surface. Therefore, the heating rate must be controlled, and the temperature should be10 ~ 25℃/h.

3. Constant temperature stage: it is the fastest growing stage of concrete strength. The constant temperature time should be different for different cement varieties. The curing temperature of ordinary cement should not exceed 80℃, and slag cement and pozzolanic cement can be increased to 85~90℃. The relative humidity of 90% ~ 100% should be maintained during the constant temperature heating stage.

4. Cooling stage: In the cooling stage, the concrete has hardened. If the temperature rises too fast, surface cracks will appear in concrete, so the cooling speed should be controlled. In general, when the thickness of the component is about 65438±00cm, the cooling rate shall not exceed 20~30℃ per hour.