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Chloride binding behaviors of alumina-rich pozzolan-lime mixtures

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Abstract

This work studied ARP-lime mixtures to understand the mechanisms of chloride binding capacity by alumina-rich pozzolan (ARP) in cementitious materials. Three ARPs including metakaolin (MK), fly ash (FA) and blast-furnace slag (SG) were evaluated. The chloride binding capacity, hydration products, chemically bound water, residual calcium hydroxide and alkali in pore solution were investigated. Results show that chloride binding capacity of ARP-lime mixture significantly depends on CaO to Al2O3 (C/A) ratio of the mixture. Friedel’s salt is formed at the expense of stratlingite and carboaluminate, accompanied with obvious improvement of alkali content in pore solution and consumption of calcium hydroxide. The additional alkali can improve the reaction of ARP and result in more bound water. Moreover, MK shows overwhelmingly higher chloride binding capacity than FA and SG.

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Acknowledgements

The authors acknowledge the financial supports of “Nature Science Foundation Project of China (No.51679179)”, “Open research project of Advanced Engineering Technology Research Institute of Wuhan University of technology in Zhongshan city (WUT202004)” and “Sanya Science and Education Innovation Park of Wuhan University of Technology (2020KF0008)”.

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Guizhou University, Guiyang, 550025, China

    Rui Yang, Rengui Xiao & Zhiyang Wang

  2. School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, China

    Xu Gao & Qian Gu

  3. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China

    Rui Yang, Yunyao Wang, Zhonghe Shui & Rui Yu

  4. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China

    Rui Yang & Yunyao Wang

  5. The R&D Center & Lab, Huaxin Cement Co., Ltd, Wuhan, 430070, China

    Yunyao Wang

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  1. Rui Yang
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  2. Yunyao Wang
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  3. Zhonghe Shui
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  4. Xu Gao
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  7. Zhiyang Wang
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Correspondence to Xu Gao or Qian Gu.

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Yang, R., Wang, Y., Shui, Z. et al. Chloride binding behaviors of alumina-rich pozzolan-lime mixtures. Mater Struct 55, 47 (2022). https://doi.org/10.1617/s11527-022-01878-z

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  • DOI: https://doi.org/10.1617/s11527-022-01878-z

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