Application of acoustic emission for monitoring shear behavior of bonded concrete-rock joints under direct shear test

被引:38
|
作者
Moradian, Z. A. [1 ]
Ballivy, G. [1 ]
Rivard, P. [1 ]
机构
[1] Univ Sherbrooke, Dept Civil Engn, Sherbrooke, PQ J1K 2R1, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
acoustic emission; bonding percentage; normal load; displacement rate; shear mechanism; adhesive bond; asperities; STIFFNESS DIRECT SHEAR;
D O I
10.1139/L2012-073
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Studying shear behavior and failure mechanism of concrete-rock interfaces between concrete structures and rock mass is highly important. To this end, laboratory direct shear tests were conducted on several bonded interfaces. The effect of normal stress, displacement rate, and bonding percentage on shear behavior of bonded joints were also evaluated. The results showed that the adhesive bond between concrete and rock has the most important effect on shear mechanism of concrete-rock interfaces. When the normal load is low, the asperities do not contribute in shear process, so the shear strength of the joints is governed by adhesive bond. The only contribution of the asperities is that they show a small peak after bond breaking peak. When the normal load is high, the asperities break simultaneously with adhesive bond and they show their contribution in the whole shear process. In a constant normal load, by decreasing bonding percentage, the brittle failure of the bonded joints is changed into softening failure because of less contribution of the adhesive bond and more contribution of the rough asperities in joint failure. Acoustic emission (AE) monitoring of bonded joints showed that for all different tested samples under various loading conditions, there has been no or very few AE activities before adhesive bond breaking point, indicating that other parameters (roughness, normal load, displacement rate) are impressed by adhesive bond and maximum shear strength is determined by this parameter.
引用
收藏
页码:887 / 896
页数:10
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