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New Cementitious Materials Based on Alkali-Activated Fly Ash: Performance at High Temperatures

AutorFernández-Jiménez, Ana; Palomo, Ángel; Pastor, José Y.; Martín, Antonia
Fecha de publicación26-ago-2008
EditorAmerican Ceramic Society
CitaciónJournal of the American Ceramic Society 91(10): 3308 - 3314
ResumenThis paper reports on a comparative study of the mechanical performance at different temperatures of a commercial Portland cement, used as a control, and a new cementitious material made from an 8M-NaOH activated fly ash and containing no OPC. Two types of mechanical tests were conducted: (i) high temperature mechanical tests, to determine the strength and fracture toughness of the two materials between 25° and 600°C, and (ii) post-thermal treatment tests, to evaluate the residual strength after 1 h of exposure to different temperatures (200°, 400°, 600°, 800°, and 1000°C). In both cases, the results showed that the new cementitious material performed significantly better at high temperatures than the Portland cement control. Differential thermogravimetry (DTG)/TG, Fourier transform infrared (FTIR), and X-ray diffraction analyses were also conducted to analyze the mineralogical and microstructural variations taking place in the material as a result of high temperature exposure. The results of these tests were correlated with the mechanical behaviour observed.
Versión del editorhttp://dx.doi.org/10.1111/j.1551-2916.2008.02625.x
ISSN1551-2916 (Online)
0002-7820 (Print)
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