Journal
CERAMICS INTERNATIONAL
Volume 42, Issue 5, Pages 6288-6295Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2016.01.014
Keywords
Geopolymer; Compressive strength; High calcium fly ash; Basalt fibers; Calcium-Silicate-Hydrate (C-S-H) phase
Categories
Funding
- National Metal and Materials Technology Center, National Science and Technology Development Agency, Ministry of Science and Technology, Kingdom of Thailand [P1300133, P1550118]
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In this study, ASTM Class C fly ash used as an alumino-silicate source was activated by metal alkali and cured at low temperature. Basalt fibers which have excellent physical and mechanical properties were added to fly ash-based geopolymers for 10-30% solid content to act as a reinforced material, and its influence on the compressive strength of geopolymer composites has been investigated. XRD study of synthesized geopolymers showed an amorphous phase of geopolymeric gel in the 2 theta region of 23 degrees-38 degrees including calcium-silicate-hydrate (C-S-H) phase, some crystalline phases of magnesioferrite, and un-reacted quartz. The microstructure investigation illustrated fly ash particles and basalt fibers were embedded in a dense alumino-silicate matrix, though there was some un-reacted phase occurred. The compressive strength of fly ash-based geopolymer matrix without basalt fibers added samples aged 28 days was 35 MPa which significantly increased 37% when the 10 wt%. basalt fibers were added. However, the addition of basalt fibers from 15 to 30 wt% has not shown a major improvement in compressive strength. In addition, it was found that the compressive strength was strong relevant to the Ca/Si ratio and the C-S-H phase in the geopolymer matrix as high compressive strength was found in the samples with high Ca/Si ratio. It is suggested that basalt fibers are one of the potential candidates as reinforcements for geopolymer composites development. (C) 2016 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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