Abstract
According to previous studies, they are reported that frost resistance of some low W/C concrete is decreased seriously by drying or alternating immersion. The cause are seemed the change of concrete organization. However, it is also pointed out that the drying affect only surface layer of concrete, it needs the mechanism on progress of decrease the frost resistance of concrete from the surface to inside. This paper reports the results of investigation on the moisture distribution in concrete affected drying under freezing and thawing, and the relationship between water content and frost resistance in concrete affected various drying conditions.
According to the results, it makes clear that the frozen water content in 10mm from surface of concrete affected drying is big. The part of 20mm from the concrete surface is affected by drying and water content of the part is decreased. On the other hand, the part of 100mm from concrete surface is affected by water absorption, and water content of the part was observed slight increase. It was observed the transportation of water from surface to inside of concrete under freezing and thawing, and the frost damage of concrete which is decreased the volume water content is big, frost damage is difference from the moisture distribution in concrete.
