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Characterization of Belgian fly ashes and their behavior in cement paste

par Tenoutasse, Nemath ;Marion, Anne-Marie
Référence Publication SP, SP-091, page (51-76)
Publication Publié, 1986-02

Article révisé par les pairs

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Résumé :

Physical and mineralogical characterization of Belgian powder fly ashes (PFA'S) are performed. In order to have a better understanding of the favourable effect of the PFA on workability of fresh mortars and concrete, the Zeta potential of PFA particles is measured in different conditions. The release of sulfates and alkali oxides from PFA in water, HC1, HF, blended cement, and lime-saturated solution is discussed. The pozzolanic activity of PFA was investigated by microcalorimetry and free lime determination of the mixture. A significant pozzolanic activity was observed after 14 days. The examination of hydrated blended cement by SEM coupled with EDAX has yielded some interesting information concerning the pozzolanic reaction between the PFA particles and the calcium hydroxide generated by cement hydration.