Abstract
The test method for estimation of compressive strength of concrete structures by Impact elastic wave method is effective because it is able to evaluate directly and repeatedly the quality of structures. In this test method, the velocity of elastic wave is measured and the compressive strength of concrete is estimated from the relational expression which is calculated by relation between the velocity and the compressive strength. In this paper, firstly, to investigate the relation between the velocity and the compressive strength in case of different mix proportions, the velocity and the compressive strength of cylinder specimen were measured in 32 kinds concretes with different mix proportions. Secondly, to investigate the influence by reinforcing bar when the velocity of elastic wave is measured in reinforced concrete structures, various measurements were performed in concrete plate specimen. Thirdly, the measuring method for velocity of elastic wave which is applicable to deterioration assessments of established concrete structures was studied. From the results of above three experiments, the study for making the methodology and the applicable condition clear about this method was discussed. This paper reports on the results of this study.
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