In this paper

the influences of different kinds and different amount of mineral admixture to Cl-penetration and diffusion in concrete are studied. The results of experiment show that separate addition of mineral admixture (ground fly ash

slag fines

silica fume) into concrete can improve its resistance to chloride ion penetration and diffusion. Furthermore

the effect of silica fume is the best

fly ash second

and then follows slag fines. Mechanism analysis shows that the pozzolanic effect of mineral admixture improves the interface between the cement and aggregate in concrete

reduces the total porosity

makes pores more smaller

on the other hand it increases the Cl-consolidation capability of concrete with low alkaline C-S-H gel produced. So the resistance to chloride ion penetration of concrete is improved.