Round-robin tests on damage evaluation of concrete based on the concept of acoustic emission rates

Making out a draft of a recommendation practice on damage evaluation of concrete by acoustic emission (AE) technique was postponed in RILEM TC 212-ACD (AE and related NDE techniques for crack detection and damage evaluation in concrete). A follow-up RILEM committee TC 239-MCM (On-Site Measurement of Concrete and Masonry Structures by Visualized NDT) was approved in March, 2010. In this committee, therefore, round-robin tests have been conducted and results are under examination for preparing the recommendation. Damage estimation of concrete by the compression test of core samples is developed, by applying AE measurement and the scalar damage parameter in damage mechanics. The procedure is named damage estimation of concrete by acoustic emission technique (DeCAT), which is based on estimating the intact modulus of elasticity in concrete from AE database. In addition to available data already published, results of the round-robin tests conducted by three groups are discussed.