Fracture process zone in concrete tension specimen

摘要

Experiments were carried out with X-rays using contrast medium and three-dimensional (3D) Acoustic Emission (AE) techniques to investigate the behavior of the fracture process zone in concrete. The results show that, as the loading increases, a zone consisting of numerous microcracks accompanied by AE events develops ahead of the notch tip in the concrete compact tension specimen. The energy of each individual AE event was calculated and plotted on the (3D) map. The results obtained by the two methods were compared and related to provide a clear view of the fracture process zone of concrete.