Experimental Study on Chloride Ion Diffusion in Concrete under Uniaxial and Biaxial Sustained Stress
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School of Civil Engineering, Changsha University of Science & Technology, Changsha 410114, China
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Department of Civil & Environmental Engineering, Louisiana State University, Baton Rouge, LA 70803, USA
*
Author to whom correspondence should be addressed.
Materials 2020, 13(24), 5717; https://doi.org/10.3390/ma13245717
Received: 22 November 2020
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Revised: 8 December 2020
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Accepted: 9 December 2020
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Published: 15 December 2020
(This article belongs to the Special Issue Corrosion Behaviour in Concrete)
The existence of axial and lateral compressive stress affect the diffusion of chloride ions in concrete will lead to the performance degradation of concrete structure. This paper experimentally studied the chloride diffusivity properties of uniaxial and biaxial sustained compressive stress under one-dimensional chloride solution erosion. The influence of different sustained compressive stress states on chloride ion diffusivity is evaluated by testing chloride concentration in concrete. The experiment results show that the existence of sustained compressive stress does not always inhibit the diffusion of chloride ions in concrete, and the numerical value of sustained compressive stress level can affect the diffusion law of chloride ions in concrete. It is found that the chloride concentration decreases most when the lateral compressive stress level is close to 0.15 times the compressive strength of concrete. In addition, the sustained compressive stress has a significant effect on chloride ion diffusion of concrete with high water/cement ratio. Then, the chloride diffusion coefficient model under uniaxial and biaxial sustained compressive stress is established based on the apparent chloride diffusion coefficient. Finally, the results demonstrate that the chloride diffusion coefficient model is reasonable and feasible by comparing the experimental data in the opening literature with the calculated values from the developed model.
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Keywords:
concrete; uniaxial/biaxial sustained compressive stress; chloride concentration; chloride diffusion coefficient; stress level
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MDPI and ACS Style
Cheng, X.; Peng, J.; Cai, C.S.; Zhang, J. Experimental Study on Chloride Ion Diffusion in Concrete under Uniaxial and Biaxial Sustained Stress. Materials 2020, 13, 5717. https://doi.org/10.3390/ma13245717
AMA Style
Cheng X, Peng J, Cai CS, Zhang J. Experimental Study on Chloride Ion Diffusion in Concrete under Uniaxial and Biaxial Sustained Stress. Materials. 2020; 13(24):5717. https://doi.org/10.3390/ma13245717
Chicago/Turabian StyleCheng, Xiaokang, Jianxin Peng, C.S. Cai, and Jianren Zhang. 2020. "Experimental Study on Chloride Ion Diffusion in Concrete under Uniaxial and Biaxial Sustained Stress" Materials 13, no. 24: 5717. https://doi.org/10.3390/ma13245717
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