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Binding materials of dehydrated phases of waste hardened cement paste and pozzolanic admixture

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Abstract

Fly ash (FA) and ground granulated blast-furnace slag (GGBFS) were added to improve the performances of regenerated binding materials (RBM) which refer to dehydrated phases with rebinding ability of waste hardened cement paste. Flowability tests, compressive strength tests, SEM, TG-DSC, and non-evaporable water content tests were employed to study the performances of the combined binding materials and the interactions between RBM, FA, and GGBFS. Results show that adding FA or GGBFS can improve the workability of RBM paste, and GGBFS has positive effects on strength of RBM. Pozzolanic reactions happen between RBM, FA, and GGBFS. And the activation effect of RBM to FA and GGBFS is superior to that of P.O grade-32.5 cement, especially at earlier ages, because of the high reactive f-CaO existing in RBM. On the advantages of the synergetic effects of RBM and pozzolanic admixtures such as FA and GGBFS, new combined binding materials can be prepared by blending them together.

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Authors and Affiliations

  1. School of Science, Wuhan University of Technology, Wuhan, 430070, China

    Linnu Lu  (吕林女)

  2. Key Laboratory for Silicate Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China

    Yongjia He & Shuguang Hu

Authors
  1. Linnu Lu  (吕林女)
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  2. Yongjia He
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  3. Shuguang Hu
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Correspondence to Linnu Lu  (吕林女).

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Funded by the National Science Foundation of China(No. 50508034)

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Lu, L., He, Y. & Hu, S. Binding materials of dehydrated phases of waste hardened cement paste and pozzolanic admixture. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 24, 140–144 (2009). https://doi.org/10.1007/s11595-009-1140-6

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  • DOI: https://doi.org/10.1007/s11595-009-1140-6

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