(2) concrete wall structure, due to the sudden reduction of environmental temperature, after the removal of the mold insulation measures are not in place, resulting in concrete cooling speed, cold shrinkage caused by internal and external temperature difference cracks;
(3) concrete surface structure, concrete slump too big, coupled with pouring process, excessive vibration so that concrete segregation and bleeding, the formation of cement content on the surface of the cement layer, due to the settlement of the mixture by the reinforcement block formed along the reinforcement crack;
(4) when the concrete mix ratio is designed, the ratio of slurry to bone and sand is too large, the concrete itself shrinks, the ability to resist cracking is weakened, and the probability of cracking is increased.
