A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Alkali release characteristics of blended cements
This paper presents results of an experimental program conducted to investigate the capacity of hydration products of different cementing materials to retain "bound" alkalis when the alkalinity of the surrounding solution drops. The study covered paste samples containing high-alkali Portland cement and various levels of silica fume and/or fly ash. The results showed that the ability of the hydration products of cement-fly ash systems to bind alkalis is a function of the CaO content of the fly ash, the binding increasing as the calcium content decreases. High-alkali fly ashes (Na2Oe > 5.0% and CaO in the range of 15% to 20%) showed considerable amounts of alkali contributed to the test solutions. Silica fume does not have a high capacity to retain alkalis in its hydration products; however, ternary blends containing silica fume and fly ash have excellent capacity to bind and retain alkalis.
Alkali release characteristics of blended cements
This paper presents results of an experimental program conducted to investigate the capacity of hydration products of different cementing materials to retain "bound" alkalis when the alkalinity of the surrounding solution drops. The study covered paste samples containing high-alkali Portland cement and various levels of silica fume and/or fly ash. The results showed that the ability of the hydration products of cement-fly ash systems to bind alkalis is a function of the CaO content of the fly ash, the binding increasing as the calcium content decreases. High-alkali fly ashes (Na2Oe > 5.0% and CaO in the range of 15% to 20%) showed considerable amounts of alkali contributed to the test solutions. Silica fume does not have a high capacity to retain alkalis in its hydration products; however, ternary blends containing silica fume and fly ash have excellent capacity to bind and retain alkalis.
Alkali release characteristics of blended cements
Shehata, Medhat H. (author) / Thomas, Michael D.A. (author)
Cement and Concrete Research ; 36 ; 1166-1175
2006
10 Seiten, 27 Quellen
Article (Journal)
English
Alkali release characteristics of blended cements
| Online Contents | 2006
Alkali release characteristics of blended cements
| British Library Online Contents | 2006
| British Library Conference Proceedings | 1993
Alkali activation of blended cements containing oil shale ash
| Online Contents | 2013
Recent advances in blended alkali-activated cements: a review
| Taylor & Francis Verlag | 2022