Abstract
Reactions of hydrated fly ash with SiO 2 fume and/or portland cement addition were studied on paste and mortar samples. Composition of hydrated fly ash: Ca(OH) 2, approx. 50; CaSO 4, approx. 9; CaCO 3, approx. 5; free CaO, approx. 5 wt%; the rest is glass composed of Ca, Al, Fe, Si, Mg, Na and K oxides. Strength development in all mixes resulted from C-S-H gel and ettringite formation. Hydrated pastes contained also calcium carbonate; Ca(OH) 2 was present only in samples with portland cement addition. The sample with portland cement addition had the highest 3-day compressive strength (3.3 MPa); 90-day compressive strength was highest in the sample with SiO 2 addition (31.7 MPa).
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