基于声发射特征参数的玻纤格栅复合梁阻裂机理表征

doi:10.11896/cldb.20070170

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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.

Key words： composite beam acoustic emission overlay three-point bending fiberglass geogrid fracture work fractal

Published: 25 November 2021 Online: 2021-12-13

CLC number:

U416.2

Fund:National Natural Science Foundation of China (52078091,51978114) and Chongqing Natural Science Foundation (cstc2020jcyj-msxmX0624).

About author: Shengxiong Zhougraduated from the School of Civil Engineering of Chongqing Jiaotong University in July 2018. Now he is a postgraduate at college of Civil Engineering, in Chongqing Jiaotong University. He is engaged in the road structures.
Weina Wangreceived her B.E. degree from Highway College of Chang'an University in 2006 and received her Ph.D. degree in highway and railway engineering from Highway College of Chang'an University in 2014. During the period, she obtained the qualification of joint training of doctoral student to study at Georgia Institute of Technology. She is currently an associate professor and master advisor in Chongqing Jiaotong University. Her research interests are road materials and structures. In recent years, she has published more than 20 academic papers in related fields.

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	ZHOU Shengxiong
	WANG Weina
	QIN Yu
	LIU Jialiang

Cite this article:

ZHOU Shengxiong,WANG Weina,QIN Yu, et al. Characterization of Crack Resistance Mechanism of Fiberglass Geogrid Reinforced Composite Beam Based on Acoustic Emission Characteristic Parameters[J]. Materials Reports, 2021, 35(22): 22033-22038.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.20070170 OR http://www.mater-rep.com/EN/Y2021/V35/I22/22033

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