纳米SiO<sub>2</sub>-橡胶粉再生混凝土力学性能试验研究及数值模拟

doi:10.11896/cldb.20090209

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Abstract The influences of nano-SiO₂ (instead of cement) and rubber powder (instead of river sand) on the compressive strength, flexural strength and splitting tensile strength at 28 days of recycled concrete were studied by mass substitution method. The two-dimensional random aggregate release program was established by MATLAB software, and the mechanical properties of recycled concrete under uniaxial compression were numerically simulated by ABAQUS software. Results show that the compressive strength, splitting tensile strength and flexural strength of recycled concrete increased first and then decreased with the increasing amount of rubber powder. When the amount of rubber powder was constant, the compressive strength, splitting tensile strength and flexural strength of recycled concrete increased with the increasing amount of nano-SiO₂. Compared with the group without nano-SiO₂, the compressive strength, splitting tensile strength and flexural strength of recycled concrete incorporated 1.5% nano-SiO₂ were increased by 13.3%, 22.8% and 21%, respectively. The error between the simulation results under uniaxial compression test and the real test results on the reference group (nano-SiO₂ and rubber content is 0) and the test group (1.5% nano-SiO₂ and 5% rubber) was minor, which indicated that the calculated values obtained from the numerical simulation analysis were in good agreement with the experimental values.

Key words： recycled aggregate concrete rubber powder nano-SiO₂ mechanical property numerical simulations

Published: 10 December 2021 Online: 2021-12-23

CLC number:

TU528

Fund:Key R & D Plan Project of Hubei Province (2020BAB071), the National Natural Science Foundation of China (51908521) and Postgraduate Education Innovation Fund Project of Wuhan University of Engineering (CX2020109)

Corresponding Authors: wuqiaoyun@wit.edu.cn

About author: Xuyong Chen graduated from Huazhong University of Science and Technology majoring in bridge and tunnel enginee-ring in June 2010. He is now a professor in the School of Civil Engineering and Architecture, Wuhan University of Engineering. He is mainly engaged in the research of solid waste recycling and bridge reliability evaluation.
Qiaoyun Wu graduated from Huazhong University of Science and Technology majoring in structural enginee-ring in June 2012. She is now a professor at the School of Civil Engineering and Architecture, Wuhan University of Engineering, majoring in seismic resis-tance, vibration control and health monitoring of engineering structures,civil engineering materials (solid waste utilization, recycled concrete), etc.

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Cite this article:

CHEN Xuyong,CHENG Ziyang,ZHAN Xu, et al. Experimental and Numerical Research on Mechanical Properties of Recycled Concrete with Nano-SiO₂-Rubber Powder[J]. Materials Reports, 2021, 35(23): 23235-23240.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.20090209 OR http://www.mater-rep.com/EN/Y2021/V35/I23/23235

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