Borges, P.H.R., Nunes, V.A., Panzera, T.H. et al. (2 more authors) (2016) The Influence of Rice Husk Ash Addition on the Properties of Metakaolin-Based Geopolymers. The Open Construction and Building Technology Journal, 10 (Suppl 3: M4). pp. 406-417. ISSN 1874-8368
Abstract
This paper investigates the replacement of metakaolin (MK) with rice husk ash (RHA) in the production of alkali-activated binders or geopolymers. The influence of the RHA addition on compressive and flexural strength, as well as water absorption and apparent porosity were determined, in terms of the percentage of RHA in the mixture and molar ratios of the mixes. Fourier Transform Infrared (FTIR) spectroscopy and Energy Dispersive spectroscopy (EDS) were carried out to assess the changes in the microstructure of the geopolymer matrices with the RHA addition. Results have shown that RHA may be a supplementary precursor for geopolymers. The composition of the geopolymer matrices containing 0-40% RHA is very similar, which indicates that the additional Si provided by RHA is not incorporated to the geopolymer matrix. In addition, geopolymers with RHA content higher than 40% present a plastic behavior, characterized by extremely low strength and high deformation, which can be attributed to the formation of silica gel in formulations containing variable Si/Al ratio.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © Borges et al.; Licensee Bentham Open. Open-Access License: This is an open access article licensed under the terms of the Creative Commons Attribution-Non-Commercial 4.0 International Public License (CC BY-NC 4.0) (https://creativecommons.org/licenses/by-nc/4.0/legalcode), which permits unrestricted, non-commercial use, distribution and reproduction in any medium, provided the work is properly cited. |
Keywords: | Alkali-activated materials; Geopolymer; Metakaolin; Rice husk ash |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Materials Science and Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 13 Apr 2017 11:12 |
Last Modified: | 13 Apr 2017 11:12 |
Published Version: | https://doi.org/10.2174/1874836801610010406 |
Status: | Published |
Publisher: | Bentham Open |
Refereed: | Yes |
Identification Number: | 10.2174/1874836801610010406 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:114913 |