Study on Concrete Deterioration in Different NaCl-Na2SO4 Solutions and the Mechanism of Cl− Diffusion
The diffusion of sulfate (SO42−) and chloride (Cl−) ions from rivers, salt lakes and saline soil into reinforced concrete is one of the main factors that contributes to the corrosion of steel reinforcing bars, thus reducing their mechanical properties. This work experimentally investigated the corro...
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Published in | Materials Vol. 14; no. 17; p. 5054 |
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Abstract | The diffusion of sulfate (SO42−) and chloride (Cl−) ions from rivers, salt lakes and saline soil into reinforced concrete is one of the main factors that contributes to the corrosion of steel reinforcing bars, thus reducing their mechanical properties. This work experimentally investigated the corrosion process involving various concentrations of NaCl-Na2SO4 leading to the coupled erosion of concrete. The appearance, weight, and mechanical properties of the concrete were measured throughout the erosion process, and the Cl− and SO42− contents in concrete were determined using Cl− rapid testing and spectrophotometry, respectively. Scanning electron microscopy, energy spectrometry, X-ray diffractometry, and mercury porosimetry were also employed to analyze microstructural changes and complex mineral combinations in these samples. The results showed that with higher Na2SO4 concentration and longer exposure time, the mass, compressive strength, and relative dynamic elastic modulus gradually increased and large pores gradually transitioned to medium and small pores. When the Na2SO4 mass fraction in the salt solution was ≥10 wt%, there was a downward trend in the mechanical properties after exposure for a certain period of time. The Cl− diffusion rate was thus related to Na2SO4 concentration. When the Na2SO4 mass fraction in solution was ≤5 wt% and exposure time short, SO42− and cement hydration/corrosion products hindered Cl− migration. In a concentrated Na2SO4 environment (≥10 wt%), the Cl− diffusion rate was accelerated in the later stages of exposure. These experiments further revealed that the Cl− migration rate was higher than that of SO42−. |
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AbstractList | The diffusion of sulfate (SO42−) and chloride (Cl−) ions from rivers, salt lakes and saline soil into reinforced concrete is one of the main factors that contributes to the corrosion of steel reinforcing bars, thus reducing their mechanical properties. This work experimentally investigated the corrosion process involving various concentrations of NaCl-Na2SO4 leading to the coupled erosion of concrete. The appearance, weight, and mechanical properties of the concrete were measured throughout the erosion process, and the Cl− and SO42− contents in concrete were determined using Cl− rapid testing and spectrophotometry, respectively. Scanning electron microscopy, energy spectrometry, X-ray diffractometry, and mercury porosimetry were also employed to analyze microstructural changes and complex mineral combinations in these samples. The results showed that with higher Na2SO4 concentration and longer exposure time, the mass, compressive strength, and relative dynamic elastic modulus gradually increased and large pores gradually transitioned to medium and small pores. When the Na2SO4 mass fraction in the salt solution was ≥10 wt%, there was a downward trend in the mechanical properties after exposure for a certain period of time. The Cl− diffusion rate was thus related to Na2SO4 concentration. When the Na2SO4 mass fraction in solution was ≤5 wt% and exposure time short, SO42− and cement hydration/corrosion products hindered Cl− migration. In a concentrated Na2SO4 environment (≥10 wt%), the Cl− diffusion rate was accelerated in the later stages of exposure. These experiments further revealed that the Cl− migration rate was higher than that of SO42−. The diffusion of sulfate (SO 4 2− ) and chloride (Cl − ) ions from rivers, salt lakes and saline soil into reinforced concrete is one of the main factors that contributes to the corrosion of steel reinforcing bars, thus reducing their mechanical properties. This work experimentally investigated the corrosion process involving various concentrations of NaCl-Na 2 SO 4 leading to the coupled erosion of concrete. The appearance, weight, and mechanical properties of the concrete were measured throughout the erosion process, and the Cl − and SO 4 2− contents in concrete were determined using Cl − rapid testing and spectrophotometry, respectively. Scanning electron microscopy, energy spectrometry, X-ray diffractometry, and mercury porosimetry were also employed to analyze microstructural changes and complex mineral combinations in these samples. The results showed that with higher Na 2 SO 4 concentration and longer exposure time, the mass, compressive strength, and relative dynamic elastic modulus gradually increased and large pores gradually transitioned to medium and small pores. When the Na 2 SO 4 mass fraction in the salt solution was ≥10 wt%, there was a downward trend in the mechanical properties after exposure for a certain period of time. The Cl − diffusion rate was thus related to Na 2 SO 4 concentration. When the Na 2 SO 4 mass fraction in solution was ≤5 wt% and exposure time short, SO 4 2− and cement hydration/corrosion products hindered Cl − migration. In a concentrated Na 2 SO 4 environment (≥10 wt%), the Cl − diffusion rate was accelerated in the later stages of exposure. These experiments further revealed that the Cl − migration rate was higher than that of SO 4 2− . |
Author | Dai, Li Wen, Xin Li, Xiaoguang Zhang, Fei Wei, Feng Liu, Long Hu, Zhiping |
AuthorAffiliation | 1 Department of Civil Engineering, School of Civil Engineering, Chang’an University, Xi’an 710064, China; zhangfei@yulinu.edu.cn (F.Z.); 2017028001@chd.edu.cn (X.W.); gxleee@chd.edu.cn (X.L.); 2019128040@chd.edu.cn (L.D.); liulong9158@163.com (L.L.) 3 Department of Civil Engineering, School of Civil Engineering, Yulin University, Yulin 719000, China; wf_889@163.com 2 Department of Safety Engineering, School of Energy Engineering, Yulin University, Yulin 719000, China |
AuthorAffiliation_xml | – name: 2 Department of Safety Engineering, School of Energy Engineering, Yulin University, Yulin 719000, China – name: 3 Department of Civil Engineering, School of Civil Engineering, Yulin University, Yulin 719000, China; wf_889@163.com – name: 1 Department of Civil Engineering, School of Civil Engineering, Chang’an University, Xi’an 710064, China; zhangfei@yulinu.edu.cn (F.Z.); 2017028001@chd.edu.cn (X.W.); gxleee@chd.edu.cn (X.L.); 2019128040@chd.edu.cn (L.D.); liulong9158@163.com (L.L.) |
Author_xml | – sequence: 1 givenname: Fei orcidid: 0000-0002-9513-6255 surname: Zhang fullname: Zhang, Fei – sequence: 2 givenname: Zhiping surname: Hu fullname: Hu, Zhiping – sequence: 3 givenname: Feng surname: Wei fullname: Wei, Feng – sequence: 4 givenname: Xin surname: Wen fullname: Wen, Xin – sequence: 5 givenname: Xiaoguang surname: Li fullname: Li, Xiaoguang – sequence: 6 givenname: Li surname: Dai fullname: Dai, Li – sequence: 7 givenname: Long surname: Liu fullname: Liu, Long |
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Snippet | The diffusion of sulfate (SO42−) and chloride (Cl−) ions from rivers, salt lakes and saline soil into reinforced concrete is one of the main factors that... The diffusion of sulfate (SO 4 2− ) and chloride (Cl − ) ions from rivers, salt lakes and saline soil into reinforced concrete is one of the main factors that... |
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SubjectTerms | Cement hydration Chloride Compressive strength Concrete Concrete deterioration Corrosion products Corrosion tests Diffusion rate Exposure interfacial transition zone Mechanical properties mechanical property microstructure pore structure Rebar Reinforced concrete Reinforcing steels Rivers Saline soils Saline solutions Salt Salt lakes Scanning electron microscopy Soil erosion Spectrophotometry Storage modulus |
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Title | Study on Concrete Deterioration in Different NaCl-Na2SO4 Solutions and the Mechanism of Cl− Diffusion |
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