Partial replacement of metakaolin with thermally treated rice husk ash in metakaolin-based geopolymer

Zhu, Huajun and Liang, Guangwei and Zhang, Zuhua and Wu, Qisheng and Du, Jianzhou (2019) Partial replacement of metakaolin with thermally treated rice husk ash in metakaolin-based geopolymer. Construction and Building Materials, 221. pp. 527-538. ISSN 0950-0618


Abstract

The influences of rice husk ash (RHA) on the reaction kinetics, mechanical property, and microstructure of metakaolin-based geopolymer (MG) were investigated. Geopolymer pastes containing different contents of RHA were prepared by sodium silicate activation. Analysis results show that both metakaolin and rice husk ash are involved in the geopolymerization, contributing to the development of mechanical properties and formation of compact microstructure. The longer reaction duration of setting time in the group incorporated RHA was ascribed to the procedure of SiO2 dissolution. The geopolymers added with RHA have a compact pore structure, which show a relatively high compressive strength. The replacement of metakaolin by RHA did not cut the total quantity of gel phase formation, but changed the form of partial gels existence and an optimal mixed point was reached at the 20% replacement level. The abundant in gel along with the pore channel and secondary filling effects make a significant contribution to the development for refinement of pore and improvement of strength. This study can be used as an indicator for the application of RHA in geopolymer, which is of great value in urging RHA towards realization in recycling.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Files associated with this item cannot be displayed due to copyright restrictions.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Future Materials (1 Jan 2017 -)
Date Deposited: 20 Jan 2020 04:36
Last Modified: 30 Jan 2020 02:42
Uncontrolled Keywords: Partial replacement, Metakaolin, Rice husk, ash, Geopolymer Compressive strength, Microstructure
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
Socio-Economic Objective: B Economic Development > 87 Construction > 8703 Construction Materials Performance and Processes > 870301 Cement and Concrete Materials
Identification Number or DOI: doi: 10.1016/j.conbuildmat.2019.06.112
URI: http://eprints.usq.edu.au/id/eprint/37685

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