EXPERIMENTAL STUDY ON THE BEHAVIOR OF BLEEDING WATER OCCURRING IN THE MOLD INTERFACE

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  • 型枠界面に生じるブリーディング水の挙動に関する実験的検討

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The occurrence of bleeding water at the interface between formwork and concrete is one cause of deterioration of the concrete surface layer. However, the bleeding water mechanism has not been fully examined. This study was carried out to better understand the bleeding water mechanism as affected by experimental factors such as powder type, powder concentration, the height of placing and mix proportions. It was found that that at least three locations had areas with different volumes of bleeding water present. In addition, the amount of bleeding water was the least in the area 0.5 cm from the mold surface, and the greatest in the area from 0.5 to 4.0 cm from the surface. It was understood that the change in bleeding amount in each region may be due to the convection phenomenon caused by the hydration reaction as well as changes in powder concentration, that the increasing rate of the bleeding amount is different with an increase in the placement height, and that the areas of bleeding water are different depending on the presence of aggregates.

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