Influence of the interfacial transition zone on the chloride migration coefficient of portland cement concrete

In the present study, experimental work and theoretical calculation were performed by taking into account the ITZ effect, the dilution effect and the tortuosity effect, to determine the relationship between ITZ and transport properties. Results indicate that the chloride migration coefficient varies as a function of the volume fraction of aggregate and that of the ITZ. The ITZ effect would dominate the effect of the blocking aggregate and the tortuosity matrix paste with high amount of aggregate addition. The porous ITZ tends to interconnect at higher aggregate content and exerts a significant influence on the transport properties