EFFECTS OF WETTING AND DRYING CYCLES REGULARITY ON MOISTURE TRANSPORT IN MORTAR

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  • KANEUJI Yuya
    TOTTORI UNIVERSITY, Graduate School of Engineering（4-101, Koyama-Minami Tottori-shi, Tottori 680-8552, Japan）
  • HARADA Ryoga
    ORIENTAL SHIRAISHI CORPORATION（5-6-52, Toyosu, Koto-ku, Tokyo 135-0061, Japan）
  • KURODA Tamotsu
    TOTTORI UNIVERSITY, Graduate School of Engineering（4-101, Koyama-Minami Tottori-shi, Tottori 680-8552, Japan）

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Other Title
  • 乾湿繰返しの規則性がモルタルの水分移動特性に与える影響

Abstract

<p>The corrosion of the reinforcing steel in the concrete structure under wetting and drying cycles occurs due to the action of permeated water and oxygen on the reinforcing steel. Therefore, the prediction of the occurrence and progress mechanisms of steel corrosion need to understand the moisture-transport properties of the concrete under wetting and drying cycles. In this study, the degree of water saturation and amount of water absorbed by mortar were measured during the wetting and drying process. Subsequently, the moisture-transport properties of the mortar under this process were investigated experimentally. Based on the experimental results, the liquid-infiltration front position moves with decreasing the degree of water saturation from boundary surface to infiltration front. As discontinuous pores, where liquid infiltration stops, randomly exist in porous media, the liquid in porous media infiltrates with this decrease in degree of water saturation. For the condition of constant accumulated absorption-period, the liquid-infiltration front positions for each condition were approximately same regardless of the wetting and drying cycles regularity. This can be occurred because the effect of drying process on the permeability of mortar is small as the drying period is short and the drying temperature is low in this study. Therefore, this suggests that the moisture-transport property for the wetting and drying cycles containing the short drying-period can be described by that property for wetting process.</p>

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