Abstract
This review relates to the CSH formed in pastes of portland or C3S hydrated under ordinary conditions. Pastes containing fly ash, slag, or other mineral additions are included. Some models of the structure at the nanometer or “crystal-chemical” level are described. Relevant data on chemical compositions obtained by X-ray microanalyses and on size distributions of the silicate anions are reviewed. Local chemical compositions are considered as well as averages for the CHH as a whole. A very disordered layer structure, approximating in some regions to jennite and in others to 1.4 nm tobermorite, satisfactorily explains the data. The regions are probably ill-defined and need not be complete layers. There is some substitution in the CSz.sbnd;H, at least by Al, but much of the Al and other ions apparently present as substituents probably occur in closely admixed phases.
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