Influence of concentration change of calcium ions over time on their diffusion through sandstone

摘要

Diffusion is one of the most important salt transport mechanisms.The knowledge of the rate of transport of ions in the pore system of building materials is thus of primary importance for their service life prediction.In this paper, the transport of Ca~(2+)` in sandstone Msene was studied as a model system;two types of experiment were performed: a)without addition of Ca~(2+)ions for the achievement of original initial concentration and b)continuous addition of Ca~(2+)ions.The experiment was performed under laboratory conditions in a two-side plexiglass box at the ambient temperature of(20±2)°C for a period of 426 hours.Calcium concentrations were analyzed chelatometrically.