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Computers and Concrete Volume 28, Number 1, July 2021 , pages 1-12 DOI: https://doi.org/10.12989/cac.2021.28.1.001 |
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Experimental study and modeling on stress-strain curve of sulfate-corroded concrete |
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Guang-Ji Yin, Xiao-Bao Zuo, Xiao-Dong Wen and Yu-Juan Tang
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| Abstract | ||
| The stress-strain curve of concrete under a uniaxial compression can reflect much information about its mechanical properties. This paper performs an experimental study and modeling on the stress-strain curve of concrete subjected to external sulfate attack (ESA). To shorten the experimental period, cement mortar specimen (CMS) with a small size is selected as research objected, and is immersed into purified water, 2.5% and 5.0% Na2SO4 solution. First, an economic test equipment is designed by adding rigid elements to ordinary hydraulic testing machine. Second, the evolution of stress-strain curve and mechanical properties of sulfate-corroded CMS with immersion time is obtained. Based on least-square method, the expressions of two chemical damage parameters are determined to respectively characterize the time-varying elastic modulus and compression strength of CMS caused by ESA. Then, a coupling chemo-mechanical damage constitutive model for sulfatecorroded CMS is established by introducing the chemical damage parameters. Finally, the numerical solution of the model is presented, and is validated by the above experimental data of stress-strain curve of CMS. | ||
| Key Words | ||
| cement mortar; chemical damage; constitutive model; mechanical properties; stress-strain curve; sulfate attack | ||
| Address | ||
| Guang-Ji Yin: Department of Civil Engineering, School of Civil and Transportation Engineering, Ningbo University of Technology, Ningbo 315211, P.R. China Xiao-Bao Zuo: Department of Civil Engineering, School of Science, Nanjing University of Science & Technology, Nanjing 210094, P.R. China Xiao-Dong Wen: Department of Civil Engineering, School of Civil and Transportation Engineering, Ningbo University of Technology, Ningbo 315211, P.R. China Yu-Juan Tang: Department of Building Materials, School of Civil Engineering, Yangzhou Ploytechnic College, Yangzhou 225009, P.R. China | ||