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The usage of recycled coarse aggregate (RCA) in concrete seems a good solution for the environmental protection and resources reservation problems. In this study, fracture process of both natural aggregate concrete (NAC) and recycled aggregate concrete (RAC) beams under threepoint bending tests were analyzed with combined acoustic emission (AE) and digital image correlation (DIC) techniques. The influence of RCA on the amplitude distribution and the absolute energy evolution of AE events over the entire loading were studied and a more brittle behaviour of RAC has been found. To check the reliability of AE and DIC results, the corresponding internal and external fracture parameters were defined; there exists a good agreement of the two methods. The two parameters are also proved to be very effective to reveal the internal and external fracture characteristics of NAC and RAC.

Fracture Process Analysis of Recycled Aggregate Concrete with Combined Acoustic Emission and Digital Image Correlation Techniques