The Biaxial Compressive Mechanical Properties and Strength Criterion of Recycled Aggregate Concrete Under Different Dyna
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RESEARCH PAPER
The Biaxial Compressive Mechanical Properties and Strength Criterion of Recycled Aggregate Concrete Under Different Dynamic Strain Rates Zhen‑jun He1 · Meng‑jia Ding2 · Xiao‑jie Zhang3 · Xue‑sheng Zhang4 Received: 30 January 2019 / Accepted: 5 October 2020 © Shiraz University 2020
Abstract In this paper, the tests under biaxial compression were conducted on five kinds of recycled aggregate concrete (RAC) by stress ratios (0:−1, −0.1:−1, −0.25:−1, −0.5:−1, −0.75:−1, and −1:−1) at the strain rates of 1 0–5/s, 10–4/s, 10–3/s, and 1 0–2/s. This study was accomplished in the servo-hydraulic multi-axial testing system, which was carried at Dalian University of Technology. The experimental phenomena of RAC under biaxial compression are described, and the experimental results of biaxial compressive strength of RAC are analyzed. The effects of strain rate, stress ratio, and substitution percentages of recycled coarse aggregate (RCA) on the biaxial compressive strength of RAC were studied. During the experiments, the failure modes of concrete have not been changed because of the increased impact of the RCA on RAC. The strength of RAC is improved with the increase in strain rates. With the increase in stress ratios, the biaxial compressive strength increases at first. However, the strength then decreases. Based on the strength theory of common concrete and analysis of experimental data, this paper built a new dynamic strength criterion. The biaxial compressive strength criterion describes the characteristics of structural RAC at different stress ratios and strain rates. This strength criterion can provide theoretical foundation for future concrete multi-axis dynamic tests and the design specification with the considerations of multi-axis dynamic strength and nonlinear analysis. The feature of the model is that it can take into account the influence of strain rates. Keywords Recycled aggregate concrete (RAC) · Biaxial compression · Stress ratios · Strain rates · Failure criterion List of Symbols RAC Recycled aggregate concrete RCA Recycled coarse aggregate RAC20 C20 strength grades of recycled aggregate concrete RAC40 C40 strength grades of recycled aggregate concrete RAC60 C60 strength grades of recycled aggregate concrete RCA-30% The replacement percentage of RCA is 30% RCA-50% The replacement percentage of RCA is 50% * Zhen‑jun He [email protected] 1
School of Civil Engineering, North China University of Technology, Beijing 100144, People’s Republic of China
2
College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, People’s Republic of China
3
College of Civil Engineering and Architecture, Dalian University, Dalian 116600, People’s Republic of China
4
Beijing Urban Construction Group Co., LTD, Beijing 100016, People’s Republic of China
fcu the uniaxial compression strength for 150 mm cubes of recycled aggregate concrete specimen ft the uniaxial tensile strength of the 100 mm × 100 mm × 100 mm cubes without friction-reducing pa
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