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Effects of applied voltage on chloride binding and microstructure of cement pastes subjected to chloride solutions

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Abstract

In this paper, the effects of applied voltage on cement paste subjected to chloride solutions were studied by comparing the microstructure and chloride binding of hardened cement pastes after bulk diffusion and rapid chloride migration (RCM) tests. The chloride concentration index, chloride binding, chemical composition and morphology of hydration products, pore structure and zeta potential of cement pastes after the bulk diffusion and RCM tests were measured. The results showed that the microstructure of cement paste was densified by the chloride binding; the applied voltage of 10 V increased the Ca/Si of C–S–H gel and modified the morphology of Friedel’s salt. The chloride content of the expressed pore solution and the C–S–H bound chloride content increased when external voltage was applied, while no difference was observed for Friedel’s salt bound chloride. The applied voltage increased the total chloride content in cement paste mainly by increasing the free chloride and C–S–H bound chloride.

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Acknowledgements

The financial support of the National Science Foundation of China (Project Nos. 51378196 and U1305243) are gratefully acknowledged.

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Authors and Affiliations

  1. Key Laboratory for Green and Advanced Civil Engineering Materials and Application Technology of Hunan Province, College of Civil Engineering, Hunan University, Changsha, 410082, China

    Xiang Hu, Caijun Shi & Nima Farzadnia

  2. Magnel Laboratory for Concrete Research, Department of Structural Engineering, Ghent University, 9052, Ghent, Belgium

    Xiang Hu & Geert de Schutter

  3. School of Civil Engineering, National Engineering Laboratory for High Speed Railway Construction, Central South University, Changsha, 410075, China

    Qiang Yuan

Authors
  1. Xiang Hu
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  2. Caijun Shi
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  3. Qiang Yuan
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  4. Nima Farzadnia
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Correspondence to Caijun Shi or Qiang Yuan.

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Hu, X., Shi, C., Yuan, Q. et al. Effects of applied voltage on chloride binding and microstructure of cement pastes subjected to chloride solutions. Mater Struct 52, 105 (2019). https://doi.org/10.1617/s11527-019-1401-6

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