Tobermorite, jennite, and cement gel

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Abstract
The discovery in 1954 by Dornberger-Schiff, Liebau and Thilo of the dreierkette (chain repeating at intervals of three tetrahedra), and Liebau's recognition of its significance for the structures of calcium silicates, laid a basis for understanding the most important of the local structures in the nearly amorphous gel which is the principal hydration product of Portland cement. They appear to be related to the structures of two crystalline hydrated calcium silicates, tobermorite and jennite. Knowledge and hypotheses concerning these structures and that of the gel are discussed.

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