Factors affecting the performance of metakaolin geopolymers exposed to elevated temperatures

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Factors affecting the performance of metakaolin geopolymers exposed to elevated temperatures

Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.3/95612

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Title: Factors affecting the performance of metakaolin geopolymers exposed to elevated temperatures
Author(s): Kong, Daniel L. Y.; Sanjayan, Jay G.; Sagoe-Crentsil, Kwesi
Abstract: The effects of geopolymer binder systems exposed to elevated temperatures are examined. Geopolymers investigated were synthesized from metakaolin, activated by combinations of sodium/potassium silicate and sodium/potassium hydroxide. The specimens were then exposed to temperatures of 800 °C. The factors studied were: (1) calcining temperatures of kaolin; (2) Si/Al ratio of the geopolymer; (3) activator/metakaolin ratio; (4) curing temperature; and (5) alkali cation type. Altogether 30 geopolymer formulations were studied. The samples were subjected to compressive strength, thermogravimetry, and scanning electron microscopy tests. Results showed that Si/Al ratio has a significant influence on elevated temperature exposure deterioration. Lesser strength loss due to elevated temperature exposures were observed in geopolymer with high Si/Al ratios (>1.5). The geopolymer binders activated by potassium-based activators showed an enhanced post-elevated temperature exposure performance compared to sodium-based systems. The optimum calcining temperature of kaolin and curing temperatures for improved temperature performance are also reported.
Publication type: Journal article
Source: Journal of Materials Science, Vol. 43, no. 3 (Feb 2008), pp. 824-831
Publication year: 2008
FOR Code(s): 0910 Manufacturing Engineering; 0912 Materials Engineering; 0913 Mechanical Engineering
Keyword(s): Binder systems; Binders; Chemical activation; Compressive strength; Curing; Curing temperature; Geopolymers; Inorganic polymers; Metakaolin; Scanning electron microscopy; Thermal effects
Publisher: Springer
ISSN: 0022-2461
Publisher URL: http://dx.doi.org/10.1007/s10853-007-2205-6
Peer reviewed