Journal
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
Volume 99, Issue 4, Pages 1192-1199Publisher
WILEY
DOI: 10.1111/jace.14079
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Funding
- U.S Air Force Office of Scientific Research (AFOSR), Tyndall Air Force Base, Florida [FA 9550-06-1-0221]
- Sumicol-Corona S.A Company
- National Learning Service of Colombia (SENA)
- US Department of Energy [DE-FG02-07-ER46453, DE-FG02-07-ER46471]
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Geopolymers or polysialates are inorganic polymeric, ceramic-like materials composed of alumina, silica, and alkali metal oxides that can be made without any thermal treatment. Additions of reinforcing phases vastly improve the mechanical properties and high-temperature stability of the geopolymer. The processing and mechanical properties of both chopped strand mat as well as 2-D woven fabric-reinforced potassium geopolymer composites have been evaluated. Hand lay-up and hydraulic press processing methods were used to produce composite panels. The room-temperature tensile and flexural strength of chopped strand mat composites was 21.0 +/- 3.1 and 31.7 +/- 4.4 MPa, respectively, while those of basalt weave-reinforced geopolymer composites reached 40.0 +/- 5.9 and 45.2 +/- 9.3 MPa, respectively. Composite microstructures were examined using optical microscopy as well as scanning electron microscopy (SEM). Mass, volume, and porosity fractions were also determined. The effect of high-temperature treatments at 25 degrees C, 300 degrees C, 600 degrees C, and 800 degrees C were analyzed. Finally, Weibull statistical analysis was performed, which showed an increase in reliability when a reinforcement phase was added to K-geopolymer.
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