PERMEATION CHARACTERISTICS OF LIQUIDS IN MORTAR UNDER WETTING AND DRYING CYCLES

KANEUJI Yuya, GOTO Toshikazu, KURODA Tamotsu

doi:10.14250/cement.76.130

<p>Reinforced concrete structures are affected by the natural wetting and drying cycles, such as rainfall. Therefore, a closer investigation of the wetting and drying processes of concrete is required because the water and oxygen permeating the reinforced concrete structure leads to corrosion of the reinforcing steel. In this study, the degree of water saturation in the mortar was measured during the wetting process and the drying process, and the permeation characteristics of the mortar were experimentally considered in each process. Moreover, the permeation characteristics of mortar were considered experimentally under wetting and drying cycles. The results suggest that the velocities of liquid movement in the water absorption process and moisture diffusion in the drying process decrease in the case of a low water-cement ratio. The reduction in these velocities occurs primarily because the compactness of mortar enhances when the water-cement ratio is low. In the drying process, the liquid absorbed into the mortar in the water absorption process moves due to the moisture diffusion that depends on the moisture gradient in mortar. Additionally, the mortar under the wetting and drying cycles could have high permeability in case that initial moisture state of the mortar ranges from the absorption surface to the penetration front is in an unsaturation state.</p>

PERMEATION CHARACTERISTICS OF LIQUIDS IN MORTAR UNDER WETTING AND DRYING CYCLES

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