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http://dx.doi.org/10.12989/cac.2021.28.1.001

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)
Publication Information
Computers and Concrete / v.28, no.1, 2021 , pp. 1-12 More about this Journal
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
cement mortar; chemical damage; constitutive model; mechanical properties; stress-strain curve; sulfate attack;
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