The Loading Capacity of RC Beam Affected by ASR Deterioration and Internal Cracking Conditions

Abstract

In order to establish a safety evaluation technique for ASR-deteriorated structures, crack observation, observation of ASR expansion such as reinforcing bar strain and concrete strain, and loading tests were conducted on RC beam specimens with ASR deterioration to evaluate the effects of ASR deterioration on the RC beam members. In addition, X-ray computed tomography (CT) images of core concrete taken from these RC beam specimens were taken to evaluate the cracking conditions in the ASR concrete. The test results showed that the ASR cracks in the specimens without shear reinforcement opened further under loading and cracks were generated, leading to shear failure. In addition, many fine cracks parallel to the loaded cracks were observed in the cores taken from the ASR specimens.