ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 34, (1) 25 - 39 (1990)


THE EFFECT OF NaNO₃ AND Ca(HCOO)₂ ADDITION ON THE HYDRATION OF VIBRATORY REGROUND CEMENT AT ⁻6 °C AND ⁺20 °C
 
Janotka Ivan 1, Frťalová Dana 1, Števula Ladislav 2
 
1 Research Institute of Civil Engineering, Lamačská 8, 817 14 Bratislava
2 Institute of Inorganic Chemistry, Centre of Chemical Research, Slovak Academy of Sciences, Dúbravska cesta 5, 842 36 Bratislava

Vibratory regrinding of cement and that of cement with an antifreeze admixture aceelerate the growth of early compressive strength of cement pastes kept at ⁻6 °C. A major proportion of the mix water remains in the form of unfrozen solution in vibratory reground pastes. Both the hydraulic activity of the cement and the efficiency of the antifreeze admixture are increased. The X-ray phase composition, thermal analysis and hahitus of the hydration product formed are indicative of a higher degree of hydration of cement in vihratory reground pastes cured at ⁻6 °C and at ⁺ 20 °C.


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