Using fly ash to partially substitute metakaolin in geopolymer synthesis

Zhang, Zuhua and Wang, Hao and Zhu, Yingcan and Reid, Andrew and Provis, John L. and Bullen, Frank (2014) Using fly ash to partially substitute metakaolin in geopolymer synthesis. Applied Clay Science, 88-89. pp. 194-201. ISSN 0169-1317


Metakaolin-based geopolymers containing between 0 and 40% fly ash were prepared, to study the influence of fly ash substitution on the reaction process and products. At constant liquid/solid ratio, the partial replacement of metakaolin by fly ash reduces the rate of reaction, but the reaction continues for an extended duration and so is still able to achieve a relatively high extent of reaction and provide a comparable 28-day compressive strength when the replacement is less than 30%. The replacement of 10% of the metakaolin by fly ash gives an increased reaction extent (as measured by isothermal conduction calorimetry), and also a higher 28-day compressive strength, by 15%. The porosity of the geopolymer increases with the level of fly ash replacement, and pore refinement and ongoing reaction of fly ash particles during the first month of curing are also apparent.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: © 2013 Elsevier B.V. Permanent restricted access to published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering
Date Deposited: 04 Aug 2014 02:06
Last Modified: 16 Mar 2015 04:04
Uncontrolled Keywords: geopolymer; fly ash; metakaolin; microstructure; calorimetry
Fields of Research : 09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
09 Engineering > 0912 Materials Engineering > 091201 Ceramics
Socio-Economic Objective: B Economic Development > 87 Construction > 8703 Construction Materials Performance and Processes > 870301 Cement and Concrete Materials
Identification Number or DOI: 10.1016/j.clay.2013.12.025

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