In modern concrete engineering, the application of concrete is developing in the direction of high strength and high fluidity. In order to increase, the strength and slump performance of concrete, the shrinking result, the shrinking result of this reason, shrink to is. stress, and risk of cracks and crack propagation during and after curing.

There are two types of cracks in concrete structures. One is called load cracks, which are caused by the direct stress of external load and structural secondary stress; the other is called deformation cracks (non-load cracks), The structure is caused by deformation changes due to factors such as temperature, expansion, contraction, creep, and uneven settlement. Most of the cracks in concrete structures are caused by deformation, and the probability is about 80%.