Discussion on test methods and influence factors of concrete chemical shrinkage

Concrete shrinkage crack is the main cause for crack occurring and damage of concrete structure,accurately measuring concrete shrinkage value,researching shrinkage mechanism,preventing shrinkage crack are the keys to solve shrinkage crack problem.Producing mechanism,forecast model for concrete chemical shrinkage and its difference with autogenous shrinkage are described,and the test methods and the influence factors of chemical shrinkage at home and abroad,such as mineral composition of cement,fineness,admixture,water cement ratio and temperature,are discussed.The research on concrete shrinkage crack possesses very important meanings.