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Título: | Activation of pozzolanic reaction of hydrated portland cement fly ash pastes in sulfate solution |
Autor: | Lorenzo García, M.ª Paz CSIC; Goñi Elizalde, Sara CSIC ; Guerrero Bustos, Ana María | Palabras clave: | Portland cement Fly ash Sulfur |
Fecha de publicación: | 2002 | Editor: | American Ceramic Society | Citación: | Journal of the American Ceramic Society 85(12): 3071-3075 (2002) | Resumen: | The activation of the pozzolanic reaction of fly ash in portland cement paste immersed in sulfate solution has been studied. Mixtures of two Spanish fly ashes (ASTM class F) with 0%, 15%, and 35% replacement of portland cement by fly ash were immersed in Na2SO4 solution, of 2880 ppm SO4 2- concentration, for a period of 90 days. The resistance of the different mixtures to the sulfate attack was evaluated using the Koch-Steinegger test. The results showed that all of the mixtures were sulfate resistant, despite the high Al2O3 content of the fly ash. The diffusion of SO4 2- and Na+ ions through the pore solution activated the pozzolanic reactivity of the fly ashes, causing microstructural changes, which were characterized by X-ray diffraction (XRD), mercury intrusion porosimetry (MIP), and scanning electron microscopy (SEM). As a result, the flexural strength of the mixtures increased, principally for the fly ash of a lower particle size and 35% of addition. | Versión del editor: | https://doi.org/10.1111/j.1151-2916.2002.tb00581.x | URI: | http://hdl.handle.net/10261/215505 | DOI: | 10.1111/j.1151-2916.2002.tb00581.x | Identificadores: | doi: 10.1111/j.1151-2916.2002.tb00581.x issn: 0002-7820 e-issn: 1551-2916 |
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