The test method of the coefficient of linear thermal expansion of hardened cement paste and the effect of temperature,moisture content and curing age on the coefficient of linear thermal expansion of hardened cement paste were investigated,which would provide basis for the structure design of large-scale concrete.

Based on the operation of VRLA batteries a series of experiments on linear expansion coefficient,charge under high temperature and high pressure and high-low temperature cycle were done to verify the sealed effect of terminals sealed with the glue,and solving the problem of the terminal leakage.