DIFFUSION OF CHLORIDE-IONS IN LIMESTONE FILLER BLENDED CEMENT PASTES AND MORTARS

The diffusion of chloride ions in neat cement pastes and mortars made with and without a limestone filler was investigated. In order to stud y the effect of the limestone filler, all mixtures were prepared at a fixed water/cement ratio (0,55). Test results indicate that the additi on of a limestone filler reduces the diffusion coefficient of chloride ions. This reduction is attributed to the effect of the limestone fil ler particles on the tortuosity of the system. Results also indicate t hat the presence of interfaces has only a limited effect on the diffus ion coefficient of chloride ions.