A calorimetric study of early hydration of alkali-slag cements

Autor:	Robert L. Day, Caijun Shi
Rok vydání:	1995
Předmět:	Heat evolution Sodium Inorganic chemistry chemistry.chemical_element Slag Building and Construction Calorimetry Alkali metal Ion chemistry visual_art visual_art.visual_art_medium General Materials Science Hydration kinetics Dissolution
Zdroj:	Cement and Concrete Research. 25:1333-1346
ISSN:	0008-8846
DOI:	10.1016/0008-8846(95)00126-w
Popis:	This paper examines the early hydration of alkali-slag cements activated by different sodium compounds, such as NaOH, Na2CO3, Na2SiO3.5H2O, Na3PO4, Na2HPO4 and NaF, at 25 and 50 °C. A conduction calorimeter was used to monitor hydration kinetics. It was found that the initial pH of activator solution has an important role in dissolving the slag and in promoting the early formation of some hydration products. However, further hydration of alkali-slag cements is dominated by the reaction of the anion or anion group of activator and the Ca2+ dissolved from slag rather than the initial pH of the activator solution. Finally, three models were proposed to describe the early hydration of alkali-slag cements based on heat evolution measurements.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::fa8d07914c66b72f84d4ff430f74a83b https://doi.org/10.1016/0008-8846(95)00126-w Zobrazit plný text záznamu Full Text from ScienceDirect