2015 Volume 71 Issue 4 Pages 365-384
In the conventional repair method of honeycombing of RC structures, the repair boundary with sound concrete may cause delamination. In this study, we proposed a new repair method which injects the epoxy resin without removing the honeycombing and then performed cyclic loading tests of RC beam specimens repaired by the proposed and conventional methods, in order to investigate delamination behaviors. The experimental results showed that the specimen repaired by the proposed method increased cracking bending capacity and decreased crack width, compared to the sound concrete specimen. In addition, delamination at boundary was not observed. On the other hand, the specimen repaired by the conventional repair method showed delamination because of shrinkage before loading and the delamination width was increased by loading. It was also found that the cyclic loading accelerated delamination in the specimen repaired by the conventional method.
