The influence of rice husk ash addition on the properties of metakaolin-based geopolymers

BORGES, Paulo H. R., NUNES, Vitor A., PANZERA, Tulio H., SCHILEO, Giorgio and FETEIRA, Antonio (2016). The influence of rice husk ash addition on the properties of metakaolin-based geopolymers. The Open Construction and Building Technology Journal, 10 (S.3:M4), 406-417. (In Press)

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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.

Item Type: Article
Additional Information: Publisher Id: TOBCTJ-10-406
Research Institute, Centre or Group: Materials and Engineering Research Institute > Structural Materials and Integrity Research Centre > Centre for Infrastructure Management
Identification Number: 10.2174/1874836801610010406
Depositing User: Margaret Boot
Date Deposited: 19 Sep 2016 15:01
Last Modified: 19 Oct 2016 20:42

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