Diffusion concentration distribution and numerical simulation of sulfate ions in polypropylene fiber concrete

In order to analysis the sulfate diffusion process in polypropylene fiber concrete, influence of introduction on porosity was calculated at first based spatial distribution features which classified into three types, penetration type, half through type and embedded type. On basis Fick’s second law reaction kinetics equation, model ions concrete established. The numerical solution achieved with adoption finite difference method concentration any position can be calculated. At last, verified using results reinforced attack test. show that relative error between calculation actual test is less than 17.65 %, accuracy relatively high.