6533b7d3fe1ef96bd1261635

RESEARCH PRODUCT

Calcium silicate hydrates: Solid and liquid phase composition

Barbara LothenbachAndré Nonat

subject

inorganic chemicalsMaterials scienceSiliconInorganic chemistry0211 other engineering and technologieschemistry.chemical_elementTobermorite02 engineering and technologyBuilding and Constructionrespiratory systemCalcium021001 nanoscience & nanotechnologyAlkali metalcomplex mixtureschemistry.chemical_compoundchemistryAluminium021105 building & constructionCalcium silicateGeneral Materials ScienceCalcium silicate hydrateSolubility0210 nano-technology

description

© 2015 Elsevier Ltd. This paper presents a review on the relationship between the composition the structure and the solution in which calcium silicate hydrate (C S H) is equilibrated. The silica chain length in C S H increases with the silicon concentration and the calcium content in the interlayer space with the calcium concentrations. Sodium and potassium are taken up in the interlayer space preferentially at low calcium concentrations and thus by low Ca/Si C S H. Aluminium uptake in C S H increases strongly at higher aluminium concentrations in the solution. At low Ca/Si aluminium substitutes silica in the bridging position at Ca/Si. > 1 aluminium is bound in TAH. Recently developed thermodynamic models are closely related to the structure of C S H and tobermorite and able to model not only the solubility and the chemical composition of the C S H but also to predict the mean silica chain length and the uptake of aluminium.

yearjournalcountryeditionlanguage
2015-12-01Cement and Concrete Research
https://doi.org/10.1016/j.cemconres.2015.03.019