Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 30, Issue -, Pages 80-91Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2011.12.011
Keywords
Characterization; Curing; Geopolymer; Metakaolin; Microstructure; Red mud; Strength
Categories
Funding
- Louisiana Board of Regents Industrial Ties
- National Basic Research Program of China [2010CB7321031]
- State Key Laboratory of Hydroscience and Engineering [2010-TC-2]
- LSU Graduate School
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The effects of source materials on the microstructure and mechanical properties were studied by comparing two types of geopolymers synthesized from metakaolin, a non-waste material, and the admixture of two wastes, red mud and fly ash. Unconfined compression testing was conducted to assess their curing time and mechanical properties, while X-ray diffraction and scanning electron microscopy employed to examine geopolymerization reactions and the composition and microstructure of the end products. For a given Si/Al ratio, the metakaolin-derived geopolymer exhibits higher compressive strength than the waste-based one. Both geopolymers contain a significant amount of voids and unreacted phases as inactive fillers within the geopolymer binder, resulting in complexity and variability in their mechanical behavior. The difference in strength and microstructure between the two geopolymers is attributed to the different reactivity of source materials, percentage of nonreactive fillers, and alkalinity for geopolymerization reactions. (C) 2011 Elsevier Ltd. All rights reserved.
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