Uniaxial compression failure characteristics of 60-year-old bridge concrete under different loading rates

被引：1

作者：

Feng Z. ^{[1
]}

Chen X. ^{[1
]}

Feng L. ^{[1
]}

Ning Y. ^{[2
]}

Shi Z. ^{[1
]}

机构：

[1] College of Civil and Transportation Engineering, Hohai University, Jiangsu

[2] Zhejiang Communications Construction Group Co., Ltd, Zhejiang

来源：

Case Studies in Construction Materials | 2022年 / 17卷

基金：

中国国家自然科学基金;

关键词：

Acoustic emission; Digital image correlation; Loading rate; Old bridge concrete; Uniaxial compression;

D O I：

10.1016/j.cscm.2022.e01276

中图分类号：

学科分类号：

摘要：

In order to study the failure characteristics of old age concrete, five different loading rates (0.02 mm/min ~ 1.5 mm/min) were used to carry out uniaxial compression tests on 60-year-old bridge concrete cores. The Digital Image Correlation (DIC) method was used for non-contact full field deformation observation of crack evolution. At the same time, the cumulative counts, event number and amplitude were used as the characterization parameters of Acoustic Emission (AE) technology to monitor the concrete damage process. The results show that the ultimate strength, the number of cracks, and the severity of failure of aged concrete increased with the increase of loading rate, while the number of AE events decreased with the increasing loading rate. And the compressive strength of the old bridge concrete is 26.3 MPa, which is 24.5% lower than the design strength of 35 MPa.There is an obvious compaction stage of aged concrete under different loading rates compared with early age concrete, and the slope of the stress-strain curve in this stage increased continuously. When the specimen was damaged, the initial cracks developed vertically and then obliquely, the overall failure of the specimen is caused by tensile cracks. © 2022 The Authors

引用

共 30 条

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