Highly Reactive β‐Dicalcium Silicate: II, Hydration Behavior at 25°C Followed by29Si Nuclear Magnetic Resonance
作者:
Hideki Ishida,
Yoshihiko Okada,
Takeshi Mitsuda,
期刊:
Journal of the American Ceramic Society
(WILEY Available online 1992)
卷期:
Volume 75,
issue 2
页码: 359-363
ISSN:0002-7820
年代: 1992
DOI:10.1111/j.1151-2916.1992.tb08187.x
出版商: Blackwell Publishing Ltd
关键词: cement;calcium silicate;nuclear magnetic resonance;calcium silicate hydrate;hydration
数据来源: WILEY
摘要:
The hydration behavior at 25°C of highly reactive β‐dicalcium silicate synthesized from hillebrandite (Ca2(SiO3)(OH)2) was studied over a period of 7 to 224 d using29Si magic‐angle spinning nuclear magnetic resonance (MAS NMR). The hydration product, C‐S‐H, contains Q2and Q1silicate tetrahedra, the chemical shifts of which are independent of the water/solid (w/s) ratio and curing time. Until the reaction is completed, the amounts of Q1and Q2formed are independent of the w/s ratio, being determined only by the degree of reaction. The ratio Q2/Q1increases as the reaction progresses and as the curing time becomes longer. From the values of Q2/Q1, it appears that the hydrate is a mixture of dimers and short single‐chain polymers. The Ca/Si ratio of the hydrate is high, taking values close to 2.0, but the Ca/Si ratio does not influence the Q2/Q1ratio. It was also found that the NMR peak intensities allow quantitative assessment sim
点击下载:
PDF
(433KB)
返 回