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Compositional Model for Calcium Silicate Hydrate (C‐S‐H) Gels, Their Solubilities, and Free Energies of Formation
Author(s) -
GLASSER FREDRIK P.,
LACHOWSKI ERIC E.,
MACPHEE DONALD E.
Publication year - 1987
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.1151-2916.1987.tb05680.x
Subject(s) - calcium silicate hydrate , silicate , solubility , calcium silicate , amorphous solid , hydrate , calcium , solid solution , mineralogy , composition (language) , chemistry , thermodynamics , crystallography , materials science , physics , metallurgy , organic chemistry , linguistics , philosophy , cement , composite material
A compositional model based on available structural evidence is proposed for amorphous calcium silicate hydrogel. It is applicable to gels in the (Ca/Si), solid range 1.0 to 1.4 and is formulated to take account of dimeric silicate species in the solid. Its composition is represented by Ca x H 6−2 x Si 2 O 7 · z Ca(OH) 2 · n H 2 O where x and z are not independently obtainable; x + z , however, is evaluated from the Ca/Si ratio. The model is applied to representative solubility data; K sp and free energies of formation for C‐S‐H's in this composition range are evaluated.