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Activation of pozzolanic reaction of hydrated portland cement fly ash pastes in sulfate solution

AuthorsLorenzo García, M.ª Paz; Goñi Elizalde, Sara CSIC ; Guerrero Bustos, Ana María
KeywordsPortland cement
Fly ash
Issue Date2002
PublisherAmerican Ceramic Society
CitationJournal of the American Ceramic Society 85(12): 3071-3075 (2002)
AbstractThe 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.
Publisher version (URL)
Identifiersdoi: 10.1111/j.1151-2916.2002.tb00581.x
issn: 0002-7820
e-issn: 1551-2916
Appears in Collections:(IETCC) Artículos

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