Effect of pore structure on the chloride-ion diffusivity of concrete

摘要

This study reveals that the effect of pore structure on chloride-ion migration into concretes dried at three different temperatures: 30 deg C, 50 deg C and 110 deg C. As the result, the pore size distribution of dried concrete could be approximated by Weibull distribution function. The shape parameter "m" of the distribution function is a drying temperature-dependent quantities, whereas the scale parameter "eta" of that is not so sensitive to the drying temperature. It was also made clear that the strongest correlation was observed between the capillary pore volume in the region of 50 nm approx 2 mu m in pore diameter and the chloride-ion diffusion coefficient. In addition, a simplified method, using the pore size distribution function, of predicting chloride-ion penetration into concrete, was developed that should lead to conservative results.