Ceramics-Silikáty 40, (3) 115 - 120 (1996) |
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ALKALINITY CHANGE DURING HYDRATION OF THE BLAST FURNACE SLAG - FLY ASH COMPOSITES
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Tomková Václava 1, Majling Ján 2
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1 Department of Thermal Engineering,
VŠB-Technical University of Ostrava, 708 33 Ostrava
2 Department of Ceramics, Glass and Cement,
Slovak Technical University, 812 37 Bratislava, Slovak Republic
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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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