Computers and Concrete

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Experimental study and modeling on stress-strain curve of sulfate-corroded concrete

  • Yin, Guang-Ji (Department of Civil Engineering, School of Civil and Transportation Engineering, Ningbo University of Technology) ;
  • Zuo, Xiao-Bao (Department of Civil Engineering, School of Science, Nanjing University of Science & Technology) ;
  • Wen, Xiao-Dong (Department of Civil Engineering, School of Civil and Transportation Engineering, Ningbo University of Technology) ;
  • Tang, Yu-Juan (Department of Building Materials, School of Civil Engineering, Yangzhou Ploytechnic College)
  • Received : 2020.09.08
  • Accepted : 2021.05.17
  • Published : 2021.07.25
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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 sulfate-corroded 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.

Keywords

Acknowledgement

This work was supported by Zhejiang Provincial Natural Science Foundation of China (LQ21E080008), Scientific Research Start-up Foundation of Ningbo University of Technology in 2020, Ningbo Scientific and Technological Innovation Major Project in 2025 (2018B10091), National Natural Science Foundation of China (51778297) and Natural Science Foundation of the Jiangsu Higher Education Institutions of China (20KJB430030).

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