The electric flux of high-performance concrete(HPC) with fly ash,blast furnace slag and silica fume and normal concrete(NC) were tested by using ASTM C1202,the diffusion coefficient and threshold value of chloride for the corrosion of steel bar were analyzed and calculated.Accordingly the service life of the HPC and NC was evaluated for the first time by the boundary element method(BEM).The result shows that the theory of computing length and the model of BEM for chloride diffusion is suitable for predictio...