|Table of Contents|

Acoustic Emission Characteristics of Rubber Concrete in Axial Tension Process(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2022年02期
Page:
78-86
Research Field:
结构工程
Publishing date:

Info

Title:
Acoustic Emission Characteristics of Rubber Concrete in Axial Tension Process
Author(s):
BU Jing-wu;  XU Hui-ying;  QIANG Yu-jie;  ZHOU Xuan;  BAI Wen-jie;  XU Gong-huan
(College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, Jiangsu, China)
Keywords:
rubber concrete;  rubber content;  uniaxial tensile test;  fracture energy;  acoustic emission
PACS:
TU528
DOI:
10.19815/j.jace.2021.06061
Abstract:
In order to study the influence of rubber content on the fracture performance of concrete under monotonic force, the uniaxial tensile tests of notched concrete prisms with different volume rubber contents(0%,5%,10%,15%,20%)were carried out. Acoustic emission technology was used to monitor the failure process of rubber concrete. Based on the test results, the curve of stress-crack opening displacement, fracture energy and acoustic emission characteristic parameters were analyzed. The results show that with the increase of rubber content, the instability load of concrete decreases, and the peak crack opening displacement increases. The fracture energy of rubber concrete is greater than that of reference concrete, and reaches the maximum value when the rubber content is 15%. The curves of acoustic emission accumulate counts and hits can divide the concrete failure process into three stages. With the increase of rubber content, the acoustic emission activity decreases, and the peak frequency changes from high frequency to low frequency. The acoustic emission b value can well reflect the failure form of the concrete specimen. The failure process of concrete specimen can be divided into two stages. During the failure process of the specimen, the b value shows a downward trend. As the rubber content increases, the b value increases. During the main crack formation stage, the difference between the maximum and minimum values of b value is reduced. The strength reduction rate is high with the rubber content less than 20%, while the strength reduction rate is lower when it exceeds 20%.

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Last Update: 2022-03-20