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Changes of pore structure and chloride content in cement pastes after pore solution expression

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Abstract
Pore solution expression is a widely accepted approach to extract pore solution of cement-based materials by appllying high pressure. In this study, the variations of pore solution distribution and chloride content in cement pastes before and after pore solution expression were examined. The results showed that the value of chloride concentration index N-c were mostly higher than 1.0 for cement pastes immersed in NaCl solution, and decreased with the chloride concentration of soaking solution and water-to-binder (w/b) ratio. During the pore solution expression, the pores larger than 40 nm were totally removed and the porosity of smaller pore was decreased. Based on a proposed physical model on structure of cement paste, the value of N-c was calculated according to the variations of pore structure and chloride content during pore solution expression. The calculated results showed similar trend as the experimental results obtained by pore solution expression method.
Keywords
BINDING, SALT, ION, METAKAOLIN, CONCRETE, STEEL, Pore solution expression, Chloride concentration index, Chloride ion, Pore structure

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MLA
Hu, Xiang, et al. “Changes of Pore Structure and Chloride Content in Cement Pastes after Pore Solution Expression.” CEMENT & CONCRETE COMPOSITES, vol. 106, 2020, doi:10.1016/j.cemconcomp.2019.103465.
APA
Hu, X., Shi, C., Yuan, Q., Zhang, J., & De Schutter, G. (2020). Changes of pore structure and chloride content in cement pastes after pore solution expression. CEMENT & CONCRETE COMPOSITES, 106. https://doi.org/10.1016/j.cemconcomp.2019.103465
Chicago author-date
Hu, Xiang, Caijun Shi, Qiang Yuan, Jian Zhang, and Geert De Schutter. 2020. “Changes of Pore Structure and Chloride Content in Cement Pastes after Pore Solution Expression.” CEMENT & CONCRETE COMPOSITES 106. https://doi.org/10.1016/j.cemconcomp.2019.103465.
Chicago author-date (all authors)
Hu, Xiang, Caijun Shi, Qiang Yuan, Jian Zhang, and Geert De Schutter. 2020. “Changes of Pore Structure and Chloride Content in Cement Pastes after Pore Solution Expression.” CEMENT & CONCRETE COMPOSITES 106. doi:10.1016/j.cemconcomp.2019.103465.
Vancouver
1.
Hu X, Shi C, Yuan Q, Zhang J, De Schutter G. Changes of pore structure and chloride content in cement pastes after pore solution expression. CEMENT & CONCRETE COMPOSITES. 2020;106.
IEEE
[1]
X. Hu, C. Shi, Q. Yuan, J. Zhang, and G. De Schutter, “Changes of pore structure and chloride content in cement pastes after pore solution expression,” CEMENT & CONCRETE COMPOSITES, vol. 106, 2020.
@article{8659786,
  abstract     = {{Pore solution expression is a widely accepted approach to extract pore solution of cement-based materials by appllying high pressure. In this study, the variations of pore solution distribution and chloride content in cement pastes before and after pore solution expression were examined. The results showed that the value of chloride concentration index N-c were mostly higher than 1.0 for cement pastes immersed in NaCl solution, and decreased with the chloride concentration of soaking solution and water-to-binder (w/b) ratio. During the pore solution expression, the pores larger than 40 nm were totally removed and the porosity of smaller pore was decreased. Based on a proposed physical model on structure of cement paste, the value of N-c was calculated according to the variations of pore structure and chloride content during pore solution expression. The calculated results showed similar trend as the experimental results obtained by pore solution expression method.}},
  articleno    = {{103465}},
  author       = {{Hu, Xiang and Shi, Caijun and Yuan, Qiang and Zhang, Jian and De Schutter, Geert}},
  issn         = {{0958-9465}},
  journal      = {{CEMENT & CONCRETE COMPOSITES}},
  keywords     = {{BINDING,SALT,ION,METAKAOLIN,CONCRETE,STEEL,Pore solution expression,Chloride concentration index,Chloride ion,Pore structure}},
  language     = {{eng}},
  pages        = {{9}},
  title        = {{Changes of pore structure and chloride content in cement pastes after pore solution expression}},
  url          = {{http://dx.doi.org/10.1016/j.cemconcomp.2019.103465}},
  volume       = {{106}},
  year         = {{2020}},
}

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