Effect of Replacement Rate of Recycled Aggregate on Mechanical Properties of Concrete Under Uniaxial Compression

被引：0
|
作者：
Chen S. [1 ,2 ,3 ]
Bai W. [1 ,2 ]
Zheng Y. [4 ]
Guan J. [1 ]
Li W. [1 ]
机构：
[1] School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou
[2] Henan Key Laboratory of Water Environment Simulation and Treatment, Zhengzhou
[3] Academician Workstation of Water Environment Governance and Ecological Restoration, Zhengzhou
[4] China Construction Seventh Engineering Division. CORP. LTD, Zhengzhou
来源：
Yingyong Jichu yu Gongcheng Kexue Xuebao/Journal of Basic Science and Engineering | 2022年 / 30卷 / 03期
关键词：
Local failure; Mesoscopic damage mechanism; Recycled aggregate concrete; Replacement rate; Statistical damage theory; Stress-strain curve; Uniaxial compression;
D O I：
10.16058/j.issn.1005-0930.2022.03.019
中图分类号：
学科分类号：
摘要：
Uniaxial compression tests were carried out for recycled aggregate concrete with a designed water-cement ratio of 0.66, and the stress-strain curves were obtained with five kinds of replacement rates, respectively. The effects of replacement rates on the strength and deformation properties of recycled concrete were studied. The effects of aggregate replacement rates on the meso-damage evolution mechanism of recycled concrete were discussed by using the statistical damage theory, which considers the microscopic heterogeneity of materials. The results show that the replacement rate of recycled aggregate has a significant effect on the macroscopic stress-strain behavior of concrete.With the increase of replacement rate, the peak nominal stress decreases at first and then increases, while the peak strain increases monotonously. The whole deformation process shows two stages of distributed damage and local failure. The meso-damage evolution process of recycled concrete can be quantitatively analyzed by using the statistical damage model, and the fracture and yield damage modes are considered.With the increase of the replacement rate, the characteristic parameters that characterizing the heterogeneous evolution of meso-damage show obvious regular changes, which are in good agreement with the internal chemical and physical mechanism and macroscopic nonlinear stress-strain behavior.Yield damage mode plays a key role in the whole process. © 2022, The Editorial Board of Journal of Basic Science and Engineering. All right reserved.
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页码：764 / 775
页数：11
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