FUNDAMENTAL STUDY ON CRACK D ETECTION OF CONCRETE WITH MECHANOLUMINESCENT SENSOR UNDER DARK-FIELD

Abstract

 This study reports the applicability of mechanoluminescent (ML) sensor to crack detection of concrete under dark-field. ML sensor could emit a visible light when the crack formed in concrete under dark-field. There was a linear relationship between the time-integra ted value of ML intensity and the energy required for the crack formation and propagation, which wa s estimated by load-CMOD curve obtained from bending tests on concrete beams. Based on fracture mechanics of concrete, the mechanism of luminescent of ML sensor was examined.