General comments of shrinkage of concrete and the methods of crack resistance

Shrinkage types of concrete were discussed,including chemical shrinkage,plastic shrinkage,self-shrinkage,dry shrinkage and temperature shrinkage.Different methods of crack resistance were put forward,including the addition of expansive agent,MgO,shrinkage reduction agent,mineral admixture,polypropylene fiber and inner curing agent.Crack resistance of concrete is a system engineering,only all of the factors including design,material,structure and construction are considered,crack resistance can be decreased to a great extent.