Characterization of Crack Resistance Mechanism of Fiberglass Geogrid Reinforced Composite Beam Based on Acoustic Emission Characteristic Parameters
ZHOU Shengxiong1, WANG Weina1,2, QIN Yu1,3, LIU Jialiang1,2
1 School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400074, China 2 National and Local Joint Engineering Laboratory of Traffic Civil Engineering Materials, Chongqing Jiaotong University, Chongqing 400074, China 3 CREEC (Chongqing) Survey, Design and Research Co., Ltd, Chongqing 400023, China
Abstract: In order to reveal the crack resistance mechanism of the fiberglass geogrid on the bending cracking behavior of the composite beam, an experimental of three-point bending of the composite beam with cement overlay asphalt layer was applied. Study the bending and fracture process of the two types of composite beams with or without fiberglass geogrid interlayer through acoustic emission (AE) characteristic parameters, and explore the evolution characteristics of acoustic emission parameters in the process of specimen damage. The fracture of composite beam was analyzed by calculating the values of RA and AF. The effect of fiberglass geogrid on the bending and fracture characteristics of composite beams was studied through fractal theory. The research results show that the AE characteristic parameters can effectively identify the pe-riod of action of the fiberglass geogrid. The fiberglass geogrid gradually bears the bending and tensile load and delays the propagation of macro cracks, and it can obviously improve the ability of maintain load after peak of the composite beam. The load-bearing period of the fiberglass geogrid lags behind the asphalt overlay, which has no effect on the bending failure load. The fiberglass geogrid improves the orderliness of the bending process of the composite beam, making micro-cracks' change from the generation, development, and the integration of macro-cracks to the final bending failure become a more orderly and asymptotic process of the composite beam, which makes it with obvious fractal feature.
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2021, Vol. 35 
