Damage Evaluation of Heavily Cracked Concrete by Initial AE Energy Parameter

抄録

In recent years, the relationship between the durability and the corrosion of reinforced concrete structures has been discussed as a technical problem. In this study, the evaluation method of concrete's damages is proposed by acoustic emission (AE) energy under a process of compressive fracture. Concrete-core samples were the taken from a canal structure in Hokkaido, Japan, which freeze-thawed damages developed heavily. The samples were tested by the compression test with AE system. Prior to the compression test, micro-cracks of the samples were estimated by helical X-ray CT. Thus, Initial AE energy characteristics depended on the degree of damage. AE energy is an effective parameter for evaluating the degree of damage that is not fully understood by compressive strength. The damage parameter from X-ray CT images was correlated with the dynamic Young's modulus. This result suggests that the damage of concrete can be evaluated by non-destructive inspection method, such as dynamic Young's modulus.