Hydration reactions in autoclaved DSP cements

Autor:	J. F. Young, G. K. Sun
Rok vydání:	1993
Předmět:	Cement Materials science Silica fume Metallurgy Mineralogy General Materials Science Building and Construction Small particles White Portland cement
Zdroj:	Advances in Cement Research. 5:163-169
ISSN:	1751-7605 0951-7197
Popis:	DSP (densified with small particles) cement pastes, made from white Portland cement and silica fume, were autoclaved at temperatures of up to 240°C. The hydration products were characterized using X-ray powder diffraction, 29Si nuclear magnetic resonance spectroscopy and scanning electron microscopy. The influences ofCaO/SiO2 ratio, autoclave temperature and time of reaction were studied. Semi-crystalline calcium silicate hydrate was the major product at low temperatures, with xonotlite, tobermorite, gyrolite, kilchoanite and 8CaO·5SiO2 present at higher temperatures. The nature of the crystalline phase depends on the initial CaO/SiO2 molar ratio; at 240°C, a distinct change in chemistry appears to occur between CaO/SiO2 ratios of 1·3 and 1·1. NMR spectroscopy has proved to be an effective means of studying the polymerization of silicates.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::82cdf3fb39b828c0cf02494699acc6f2 https://doi.org/10.1680/adcr.1993.5.20.163 Zobrazit plný text záznamu