Effect of fatigue load on damage and fracture properties of rubber concrete

被引：0
|
作者：
Liu M. [1 ]
Lu J. [1 ,2 ]
Ming P. [1 ]
Liu J. [1 ]
机构：
[1] Institute of Materials Structure, Nanjing Hydraulic Research Institute, Nanjing
[2] State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing
来源：
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2021年 / 38卷 / 05期
关键词：
Acoustic emission cumulative energy; Damage variable; Fatigue; Maximum crack length; Rubber concrete;
D O I：
10.13801/j.cnki.fhclxb.20200723.004
中图分类号：
学科分类号：
摘要：
Although rubber concrete has better properties of plasticity and fatigue, due to the incorporation of rubber, its dispersion increases under fatigue load and the damage process and the ultimate fracture mechanism are not clear. In order to study the damage and fracture performance of rubber concrete under fatigue load, the three-point bending fatigue fracture test of concrete with different rubber contents under fatigue load based on acoustic emission was carried out. The effective crack length a was calculated and the change law of the crack length a of the rubber concrete with different rubber contents under the fatigue load was analyzed. The crack length ac and the acoustic emission cumulative energy EAE were used to define the damage variables Da and DAE.The variation law of the fracture energy GF of the rubber concrete with different rubber contents under the fatigue load and the law of the occurrence and propagation of cracks in the rubber concrete under the fatigue load were analyzed using the signal duration in the acoustic emission. The results show that the fracture energy of the concrete increases linearly with the increase of the rubber content. Under the fatigue load, both a and Da change in an inverted S-shaped law, while DAE shows a positive S-shaped law; The duration of the acoustic emission signal shows that the cracks in the rubber concrete always appear or expand when the load is small under the fatigue load. Copyright ©2021 Acta Materiae Compositae Sinica. All rights reserved.
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页码：1594 / 1603
页数：9
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