Journal
CEMENT & CONCRETE COMPOSITES
Volume 31, Issue 10, Pages 762-768Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2009.07.006
Keywords
Geopolymer; Fly ash; Zeolite; Alkali-activation
Funding
- Test Fund of the Key Laboratory of Nuclear Resources and Environment (East China Institute of Technology)
- Ministry of Education, and the Analysis Test Center of Nanchang University
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Geopolymers were synthesized by using fly ash as the main starting material, zeolite or bentonite as supplementary materials, and NaOH and CaO together as activator. An orthogonal array testing protocol was used to analyze the influence of the mix proportion on the properties of the geopolymers. The results indicate that the concentration of NaOH solution and the CaO content play an important role on the strength of the materials. Especially, with zeolite as additive, the fly ash-based geopolymer shows the highest strength and the best sulfate resistance. Infrared spectroscopy, X-ray, and SEM-EDX demonstrate that supplementary zeolite may involve the process of geopolymerization to form a stable zeolitic structure and improve the properties of the geopolymer. Bentonite simply acts as a filler to make the geopolymer more compact, but shows no improvement on the compositions and the microstructures of the geopolymer. (C) 2009 Elsevier Ltd. All rights reserved.
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