Abstract
For detailed inspections of concrete damage, core samples are often drilled out and then mechanical properties are measured. In this chapter, damage estimation for concrete materials by the compression test of core samples is introduced, by applying acoustic emission (AE) measurement and the scalar damage parameter in damage mechanics. The procedure is named DeCAT (damage estimation of concrete by acoustic emission technique), which is based on estimating the intact modulus of elasticity in concrete. AE behavior of the concrete core under compression is analyzed by the rate-process theory, and mechanical behavior is approximated by the Loland model of damage mechanics. Then, the quantitative damage of the core concrete is evaluated as the relative damage by applying the DeCAT procedure. The estimated damage parameter is correlated with dynamic Young’s modulus, AE energy, and X-ray CT parameters.
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