Study On Temperature Crack Control Of Mass Concrete Raft

With the rapid devolopment of our country economy, the various structures become more and more,meanwhile the demand of the design and the construction are improved. mass concrete is used in the industry and civil buildingThe question of mass concrete crack is inevitable in mass concrete's using.once the crack appears in the concrete,The stability and the durability would be affected,even become some danger.The study of mass concrete crack is very necessary.This paper starts from the definition of mass mass concrete, introduces types of mass concrete crack,then explains the mechanisation of production of mass concrete crack and major factors. It reveals that the main reason is heat of hydration and Internal and external temperature difference. So it should control the heat of hydration and cut down the temperature difference. Specific methods:1.Control from design side. The methods main have choice of concrete strength, using later concrete strength, ways of reinforcement .2.Action from choice of the material . choose from the cement, aggregate and admixture. to control the cracks.3.Control from construction and conservation.At last, the paper uses by lejuchang shantytowns project to introduce feasibility and operational of these control methods. By contrast theoretical calculation and practical measurement,and use MIDAS to prove rationality of these control methods and provide a reference for future projects.