Concrete with a temperature of 10 degrees will freeze if the temperature drops to 0 degrees after two days.

After 24 hours of concrete pouring, the temperature will drop below zero, and it will take 3-7 days for concrete to reach 50%-70% strength in low temperature weather.

If the concrete is attacked by negative temperature during the setting process, the hydration of cement is blocked, in which the free water begins to freeze and the volume increases by 9%, which may cause the danger of concrete freezing and seriously affect the quality of concrete. Although the strength of concrete can still be improved after curing at room temperature in the early stage of freezing, it can not be restored to the level that has not been destroyed by freezing, and the earlier the freezing, the more difficult it is to restore the strength in the later stage.

Extended data:

Concrete is classified according to its function.

Structural concrete, thermal insulation concrete, decorative concrete, waterproof concrete, refractory concrete, hydraulic concrete, marine concrete, road concrete, radiation-proof concrete, etc.

Concrete is classified according to construction technology.

Centrifugal concrete, vacuum concrete, grouting concrete, shotcrete, roller compacted concrete, extruded concrete, pumping concrete, etc. According to the reinforcement methods, there are plain concrete, reinforced concrete, steel wire mesh cement, fiber concrete and prestressed concrete.

Concrete is classified according to the workability of mixture.

Hard concrete, semi-hard concrete, plastic concrete, flowing concrete, high fluidity concrete, flowing concrete, etc.