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Highly Reactive β‐Dicalcium Silicate: V, Influence of Specific Surface Area on Hydration
Author(s) -
Sasaki Kaori,
Ishida Hideki,
Okada Yoshihiko,
Mitsuda Takeshi
Publication year - 1993
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1993.tb05308.x
Subject(s) - calcium silicate hydrate , specific surface area , hydrate , hydration reaction , chemistry , silicate , dissociation (chemistry) , reaction rate , chemical engineering , kinetics , mineralogy , calcium silicate , chemical reaction , inorganic chemistry , materials science , cement , metallurgy , organic chemistry , catalysis , engineering , physics , quantum mechanics
The hydration of β‐C 2 S prepared from hillebrandite [Ca 2 (SiO 3 )(OH) 2 ] and having specific surface areas of 6.8, 5.5, and 3.1 m 2 /g was investigated. Different specific areas were obtained by varying the dissociation temperature of hillebrandite. In addition, the hydration of β‐C 2 S synthesized from high‐temperature solid‐state reaction was also studied as a comparison. The specific surface area exerts a strong influence on the hydration rate, which increases as the surface area increases. The degree of influence changes with the reaction, becoming greater as hydration progresses. There is initially a linear relationship between specific area and the time required to complete a specific reaction. The specific surface area also affects the reaction mechanism. In the case of specific areas of 5.5 m 2 /g or less, the reaction changes from a chemical reaction to a diffusion‐controlled one, and the degree of reaction comes almost to a halt at 80% to 85%. The Ca/Si ratios of hydrate and the silicate anion structures were also investigated in this study.