Ceramics-Silikáty 40 (3) 115-120 (1996)

ALKALINITY CHANGE DURING HYDRATION OF THE BLAST FURNACE SLAG - FLY ASH COMPOSITES

V. Tomková, J. Majling

The alkalinity change of the alkaline activated blast furnace slag alone (a dose of 3 wt.% of Na₂O) and of the composites containing up to 20 wt.% of the fly ash component is nearly the same and ranges from the pH value 11.43 after 3 days of hydration to the value of approx. 11.2 after 42 days of hydration. An increase of the fly ash content (up to 60 wt.%) decreases the internal pH values approx. by 0.2 at each respective time of hydration.

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