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Thermal Behavior of Portland Cement and Fly Ash–Metakaolin-Based Geopolymer Cement Pastes

  • Research Article - Civil Engineering
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Abstract

Geopolymer specimens were prepared by combination of fly ash and metakaolin activated by sodium silicate (\({{\rm Na}_{2}{\rm SiO}_{3}}\)) and sodium hydroxide (NaOH) solutions. The effect of high temperature on the compressive strength, mass loss and shrinkage of geopolymer cement pastes and ordinary portland cement (OPC) pastes were assessed experimentally. Microstructure formation and development were characterized in terms of pore structure by mercury intrusion porosimetry. The results reveal that at temperatures exceeding \({400\,^{\circ}{\rm C}}\) geopolymer cement paste is superior to OPC paste. Firstly, the compressive strength drops rapidly for the OPC paste to practically zero strength at \({600\,^{\circ}{\rm C}}\) , while it drops slowly for the fly ash–metakaolin-based geopolymer cement paste to 46 MPa at \({1000\,^{\circ}{\rm C}}\) . Secondly, while the mass loss increases for the OPC paste, it is maintained at a constant, lower value for the geopolymer cement paste. Thirdly, shrinkage of geopolymer cement paste is at least three times smaller than that of OPC paste.

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Authors and Affiliations

  1. Faculty of Materials Science and Chemistry, China University of Geosciences, Wuhan, 430074, China

    Ping Duan, Chunjie Yan, Wei Zhou & Wenjun Luo

  2. Engineering Research Center of Nano-Geomaterials of Ministry of Education, China University of Geosciences, Wuhan, 430074, China

    Ping Duan, Chunjie Yan, Wei Zhou & Wenjun Luo

  3. Zhejiang Research Institute, China University of Geosciences, Hangzhou, 311305, China

    Ping Duan & Chunjie Yan

Authors
  1. Ping Duan
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  2. Chunjie Yan
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  3. Wei Zhou
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  4. Wenjun Luo
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Correspondence to Chunjie Yan.

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Duan, P., Yan, C., Zhou, W. et al. Thermal Behavior of Portland Cement and Fly Ash–Metakaolin-Based Geopolymer Cement Pastes. Arab J Sci Eng 40, 2261–2269 (2015). https://doi.org/10.1007/s13369-015-1748-0

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  • DOI: https://doi.org/10.1007/s13369-015-1748-0

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