|Table of Contents|

Critical failure characteristics and uniaxial compression damage constitutive equation of recycled concrete(PDF)

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

Issue:
2023年06期
Page:
19-26
Research Field:
建筑材料
Publishing date:

Info

Title:
Critical failure characteristics and uniaxial compression damage constitutive equation of recycled concrete
Author(s):
LIN Pengjie1;  QIN Yongjun2;  YU Jiang2;  PI Yanjie2
(1.School of Civil Engineering, Xinjiang Institute of Engineering, Urumqi 830023, Xinjiang, China; 2. School of Civil Engineering and Architecture, Xinjiang University, Urumqi 830047, Xinjiang, China)
Keywords:
recycled concrete;  acoustic emission;  energy accelerated release;  damage constitutive equation
PACS:
TU528
DOI:
10.19815/j.jace.2022.01102
Abstract:
Five groups of recycled concrete prism specimens with different recycled coarse aggregate replacement rates were made and uniaxial compression tests were carried out. The acoustic emission(AE)parameters of the whole process of uniaxial compression of the prism specimens were collected, and the uniaxial compression stress-strain curves were drawn. By analyzing the acoustic emission energy parameters, the time-acoustic emission cumulative energy curve in the process of compression failure was drawn, and the curve was fitted by the power function Power formula. The test curve was compared with the fitting curve, and the energy release law of acoustic emission energy in the damage process of recycled concrete was analyzed by combining the energy accelerated release theory. The time when the cumulative energy of acoustic emission increased suddenly was regarded as the critical failure point, and the damage variable was defined by the acoustic emission ringing count collected in the whole process of compression, considering the initial damage caused by the amount of recycled coarse aggregate, the regeneration parameters were defined by the percentage of recycled coarse aggregate replacement rate. The acoustic emission damage evolution model was established by means of Weibull statistical method and damage theory. The acoustic emission damage constitutive equation considering the influence of initial defects of recycled coarse aggregate was established, and the stress-strain curve fitted by the new equation was compared with the test curve. The results show that the fitting curve is in good agreement with the experimental curve, and the new equation can better describe the damage evolution process of recycled concrete.

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Last Update: 2023-12-01