Abstract
Recycling rubber aggregates from used grinded tires is a behavior of environmental protection. By performing cyclic flexural tests, this paper explores the effect of rubber aggregate content on the crack propagation of notched concrete beams containing waste rubber aggregates. The crack mouth opening displacement is tested. The acoustic emission technique is applied to detect the damage in the fracture process zone. The crack propagation is evaluated using the critical value of the mode I stress intensity factor. It was found that the crack length and stress intensity factor decrease with the increasing of rubber aggregates content. The crack length and stress intensity factor at failure under constant cyclic loading are larger than those at corresponding post-peak load level. It was observed that the damage evolution curves under cyclic envelope loading can be divided into three stages: initial-quick-stable stages. And they are S-shaped, quick-stable-accelerated curves under constant cyclic loading. Rubber aggregate reduces the acoustic emission activities in concrete specimens. Accumulations of acoustic emission hits, acoustic emission counts and acoustic emission energy are found in accordance with the damage evolution of concrete beam. The relation between damage and accumulative acoustic emission hits is quantified by fitting experimental data. The fitting curves agree well with test results.
Funding statement: This research is based upon work supported by the National Natural Science Foundation of China (Grant No. 51809227) granted to the first author Dr. Jingwu Bu.
About the authors
Jingwu Bu was born on April 5, 1988. She is a lecturer in the School of Hydraulic Science and Engineering at Yangzhou University, Yangzhou, China. She received her PhD at the College of Water Conservancy and Hydropower Engineering at Hohai University in 2017. Her research interests include the mechanical behavior of concrete materials by using nondestructive, destructive testing methods.
Xudong Chen was born on December 12, 1985. He is a Professor in the College of Civil and Transportation Engineering at Hohai University, Nanjing, China, where he received his PhD in 2014. His research interests include experimental and numerical simulation on mechanical behavior of cement-based materials under impact and earthquake loads.
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