Abstract
The use of mechanoluminescent (ML) sensor in form of SrAl2O4:Eu (SAOE) film-coating to predict fracture in reinforced concrete structures is described. Four-point bending tests were performed, and strong and localized ML before cracking was found from the ML images of the SAOE film coated on the concrete surface. The location of the strong ML was in agreement with the location of the cracks caused by the increasing load. This indicates that crack formation can be predicted by using ML sensor. Along with loading, the real-time ML images also clearly showed crack growing on the concrete surface. The results show that the formation position, the propagation direction and the propagating process can be measured from the ML images directly and which crack is in developing can be judged by dynamic ML images. ML film sensor is available to predict fracture in reinforced concrete structures.
