Abstract
Recently, a number of concrete structures are approaching to their service limit in Japan. Therefore, testing techniques for evaluating durability and structural integrity are urgently required and should be established promptly. In this respect, nondestructive evaluation based on acoustic emission (AE) is one of promising candidates for diagnosing concrete structures. In the present report, research activity on diagnostic applications of AE to concrete structures is summarized. The investigation of crack characteristics by AE measurement, the estimation of crack configurations by AE and Ultrasonic testing (UT), and the predictions of crack propagation based on AE technique and fracture mechanics are discussed.
