content, and the presence of an oxide ion in the lattice. During clinker grinding, first step of partial dissolution of C₃S involves hydration of superficial oxide ions and leads to a hydroxylated C₃S surface.

It reacts with water (roughly) according to the reaction:

Which can also be written in the cement chemist notation as:

: + C-S-H +

The main hydrate is referred to as the calcium silicate hydrate

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