Abstract
Effect of chloride in liquid water on drying and wetting behavior of concrete was experimentally investigated. Experimental result showed that equilibrated water content increases and moisture transfer rate in concrete decreases with increasing of chloride content in concrete. Consequently, concrete tends to wet by the existence of chloride. Analytical method for coupled transport of water and chloride in concrete which effect of chloride on moisture transport is taken into account was proposed. Increasing of equilibrated water content due to chloride can be expressed by considering decreasing of saturated vapor pressure and change in physical property of liquid water. Decreasing of moisture transfer rate in concrete due to chloride can be expressed by considering decreasing in transfer rate of liquid water in accordance with chloride concentration.
