In light of the hazard of cast-in-situ slab cracks and combined with their distributing condition in concrete construction,this paper analyzes the causes of slab crack from dry shrinkage of concrete,temperature influence,raw materials and construction management,and proposes relevant preventive measures to increase construction quality of cast-in-site concrete structure.

This article introduces the form and appearance of concrete slab crack,analyzes its causes from design,construction and the application of material,and illustrates its preventive measures and mending methods to ensure construction quality of concrete structure.

According to the category of concrete slab crack,the author analyzes the causes of crack appearance,introduces its prevention and control measures,and proposes treatment measures for existed crack,which to comfort utilizing function of building and to ensure security of its structure.