2018 Volume 29 Pages 101-109
In the current surface water absorption test proposed by the authors, the surface water absorption rate at 10 minutes obtained from the measurement result is used as the criterion for evaluating cover concrete quality. In this study, it was experimentally confirmed that the surface water absorption rate at 10 minutes and the amount of absorption in 10 minutes are in a linear relationship for concretes with W/C of 55%, 65%, and 75% and with various extents of deterioration caused by accelerated freezing and thawing, and thus that evaluation of the extent of deterioration due to freezing and thawing of cover concrete with W/C in the range of 55% to 75% is possible with the current criteria. Shortening of the measurement time was also investigated and new evaluation criteria for measurement durations between 1 and 10 minutes were proposed. The evaluation results yielded by the newly proposed criteria are the same as the results achieved by the current criteria.
