Mechanical Performance of RAC under True-Triaxial Compression after High Temperatures
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 8
Abstract
In recent years, the mechanical behavior of recycled aggregate concrete (RAC) under different condition has attracted great attention from researchers. As RAC can make full use of the concrete waste generated by the demolition of buildings, it can promote the development of green and sustainable construction technology. The true-triaxial compression tests of RAC with different replacement rates (0%, 50%, 100%) after high temperatures (200°C, 400°C) were carried out for the first time. Through the study, the triaxial compressive strength, deformation and stress-strain curve of RAC under different stress ratios are obtained. The improved failure criterion of concrete is established. It is found that the true-triaxial compressive strength and peak strain under high temperature are greater than those under uniaxial compressive strength and room temperature. The main failure modes of RAC specimens under true-triaxial test are sheet splitting and shear failure. The research results obtained in this work are the first to study the true-triaxial compression behavior of RAC after exposure to high temperatures.
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Acknowledgments
The authors greatly appreciate the editors and referees spending time in attentively reading and checking this article. This work is supported by grants from the National Natural Science Foundation of China (Grant Nos. 51868005, 51878672, and 11972379), Guangxi Natural Science Foundation (Grant Nos. 2013GXNSFAA019311 and 2018GXNSFAA050133), Guangxi Scientific Research Program (Grant No. AB17292060), Hunan 100talent plan, Hunan high-level talent plan (Grant No. 420030004), Foundation of Key Laboratory of Structures Dynamic Behavior and Control (Ministry of Education) in Harbin Institute of Technology (Grant No. LPQQ5780200319), and Central South University Research Project (Grant Nos. 202045006, 502390001, and 502501006). The findings and opinions expressed in this article are only those of the authors and do not necessarily reflect the views of the sponsors.
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©2020 American Society of Civil Engineers.
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Received: Oct 25, 2018
Accepted: Dec 16, 2019
Published online: May 19, 2020
Published in print: Aug 1, 2020
Discussion open until: Oct 19, 2020
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