1. Covering curing method is to cover the concrete surface with straw mats and quilts. So as to keep warm and restrain temperature loss. It is usually used in combination with other curing methods. Of course, this method is not effective. If the temperature is too low, the purpose of maintenance can not be achieved basically, which is a waste of time and manpower.

2, negative temperature curing method, this method refers to the concrete mixed with antifreeze, so that it continues to harden in the negative temperature environment, before the concrete temperature drops to the specified temperature of antifreeze, it reaches the critical strength of freezing. If the area is relatively large, the cost is also relatively large. Moreover, the proportion of antifreeze directly affects the periodic effect of hardening, which is difficult to control.

3, steam curing method, is to put the concrete member or structure being cured in the erection shed, if it is not easy to move the road, build a shed on it, and then use the high temperature steam generated by the concrete curing steam generator to introduce it into the shed to improve the internal temperature, so as to carry out concrete hardening operation.