What are the methods to avoid expansion cracks in summer in winter construction?

Shrinkage cracks usually occur some time after concrete curing or about a week after concrete pouring. The evaporation of water in cement slurry will cause drying shrinkage, which is irreversible.

Main preventive measures of Xinxiang Zhongxin Chemical Industry;

First, choose cement with small shrinkage, generally use medium and low heat cement and fly ash cement to reduce the amount of cement.

Secondly, the drying shrinkage of concrete is greatly influenced by the water-cement ratio. The greater the water-cement ratio, the greater the drying shrinkage. Therefore, the selection of water-cement ratio should be controlled as much as possible in the design of concrete mixture ratio, and an appropriate amount of water reducer should be added at the same time.

Third, strictly control the mix proportion of concrete mixing and construction, and the water consumption of concrete shall not be greater than the water consumption given by the mix proportion design.

Fourth, strengthen the early curing of concrete and appropriately extend the curing time of concrete. In winter construction, it is necessary to appropriately extend the thermal insulation and covering time of concrete, and use curing agent for curing. Correct use of concrete antifreeze

Fifthly, proper contraction joints are set in concrete structures.