How to deal with concrete after frosting?

1. If the extremely thin surface of concrete is frozen after freezing, the treatment method is to add heat preservation measures.

2. If the concrete is severely frozen, the free water in the concrete will freeze. When water freezes, the volume increases by about 10%, which will form ice beads in concrete. When the ice dissolves, there will be many tiny holes, such as frozen tofu frozen in winter in the north, and concrete has no strength.

3, winter construction of concrete, need to take thermal insulation measures to prevent concrete from freezing, can be covered with straw bags, rock wool insulation, plus plastic film windproof, thermal insulation maintenance for a period of time, until the concrete reaches the critical strength will not be frozen, and then remove the thermal insulation measures. The time of heat preservation and curing needs to be determined according to the strength grade of concrete, setting time and weather conditions. At present, the compressive strength test of concrete blocks cured under the same conditions is used to judge whether the critical strength is reached.