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.

Material cause and control measure of the cast-in-situ concrete floor crack;

From design,concrete performance,construction process,this article analyses the reasons of floor crack and introduces preventive measures.

But meanwhile, the cast-in-place reinforced concrete floor has a universal quality problem, floor crack.

This paper shows the causes of diagonal cracks in corners of concrete slab respectively by analysis of concrete materials,construction quality,structure and temperature stress as well as giving countermeasures for prevention.

Analysis and the focal point of supervision management of the concrete floor crack;