The vapor permeability, equilibrium moisture content, hydraulic conductivity, and thermal conductivity of concrete specimens with three different strengths were measured under various conditions of temperature and relative humidity. Based on the measured results, the relationship between hygrothermal properties and strength, and the relationship between hygrothermal properties, water content, and temperature were considered. The variability of measured hygrothermal properties was clarified. Then, to evaluate the influence that the variability of hygrothermal properties has on the hygrothermal behaviors of a concrete wall, a water absorption experiment using a small-scale concrete wall with tile finishing was carried out under constant temperature. The experimental result shows a significantly difference between three specimens in the hygrothermal behaviors, which is partly because of the variability of the hygrothermal properties.
In Japan, tile exfoliation from external walls is a serious problem that must be prevented. In our previous study, a tiled concrete sample was dried at a temperature of 105 1C for preconditioning. Then, tile exfoliation occurred. Since this seemed to indicate a relationship between tile exfoliation and moisture content, it was further pursued in this study. First, drying experiments on concrete samples just after tiling were carried out under different ambient air temperatures. The following results were obtained.Tile exfoliation occurs even at the lower drying temperatures. Tile exfoliation starts at corner tiles (seen in all experiments). When the average moisture content of the tiled concrete sample becomes lower than a certain value, tile exfoliation occurs. Next, the experiments were analyzed using a three-dimensional model of simultaneous heat and moisture transport. The calculated moisture content agreed well with the measured results. By comparing the measurement and simulation results, it is considered that the tiles are exfoliated when the moisture content of the mortar on the back side of the tile becomes lower than a certain value. Therefore, the moisture content can serve as an index for evaluating the occurrence of the tile exfoliation.
We developed thdnish concrete sur亀ce method with high accuracy for the reinfbrced concrete eondominium house , without " selfLleveling method work " . That was worked expenmentally , and aocomplished more than 80%of cQnstruction, the accuracy 1arget less than ± 2mm ・
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