Proposed Structure for Calcium Silicate Hydrate Gel

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Abstract
Calcium silicate hydrate gel is a very poorly crystalline material that is the main product of reaction of portland cement with water. Evidence is presented for a disordered layer structure, in which most of the layers are structurally imperfect ones of jennite (Ca9Si6O32H22), and others are similarly related to 1.4‐nm tobermorite (Ca5Si6O26H18), both structures being modified by omission of many of their silicate tetrahedra. The evidence comprises conditions of formation, silicate anion type, Ca/Si ratio, H2O/Ca ratios and densities for various drying conditions, thermogravimetric curve, X‐ray powder and selected‐area electron diffraction patterns, and results of analytical electron microfcopy.

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