Effect of Cement Kiln Bypass Dust on Properties and Hydration of Akali-Activated Slag Mixtures

article in a collection out of WoS and Scopus

English

During recent decades, alkali-activated slag (AAS) systems have attracted great scientific interest around the world. Despite many efforts its severe shrinkage and cracking is still a delicate issue. The aim of this work was to partially replace slag by cement kiln bypass dust (CBPD) which, on the basis of its mineralogical composition, would act as an expansive agent (EA) and thus compensate AAS shrinkage. It was observed that volume changes of AAS/CBPD mixtures strongly depended on CBPD dose since low slag replacement levels did not significantly reduce autogenous shrinkage while around 50% of CBPD or more led to severe expansion. Based on X-ray diffraction, this expansion is related to hydrocalumite-type phase formation. The presence of CBPD also totally modified calorimetric response of AAS pastes.

Cement kiln bypass dust; alkaline activation; hydration; calorimetry; X-ray diffraction; volume change

BÍLEK Jr., V.; KALINA, L.; NOVOTNÝ, R.; MÁSILKO, J.; ŠOUKAL, F.

16. 9. 2019

Research Institute of Binding Materials Prague

Prague

2523-935X

5th International Congress on the Chemistry of Cement (ICCC 2019) Congress proceedings – Papers and Posters Proceedings

Czech Republic

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