Improving compressive strength of fly ash-based geopolymer composites by basalt fibers addition
Ceramics International, ISSN: 0272-8842, Vol: 42, Issue: 5, Page: 6288-6295
2016
- 132Citations
- 128Captures
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Article Description
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 θ region of 23°–38° 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.
Bibliographic Details
http://www.sciencedirect.com/science/article/pii/S0272884216000420; http://dx.doi.org/10.1016/j.ceramint.2016.01.014; http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84954341789&origin=inward; https://linkinghub.elsevier.com/retrieve/pii/S0272884216000420; https://dx.doi.org/10.1016/j.ceramint.2016.01.014
Elsevier BV
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