✦ LIBER ✦

The composition of the C-S-H phases in portland cement pastes

✍ Scribed by D.L. Rayment; A.J. Majumdar

Publisher: Elsevier Science
Year: 1982
Tongue: English
Weight: 718 KB
Volume: 12
Category: Article
ISSN: 0008-8846
DOI: 10.1016/0008-8846(82)90039-4

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✦ Synopsis

The composition of the calcium silicate hydrate (C-S-H) present in Portland cement pastes from eight days to five years old, and in concrete samples ten years old, has been determined by electron probe mlcro-analysis.

The dependence of C-S-H composition on water/cement ratios has also been studied. When the cement is only partially hydrated inner and outer hydrate layers are seen around alite grains.

These hydrates have different chemical compositions.

With progressive hydration it becomes impossible to distinguish the Innner from outer hydrates without a reference alite grain. At this stage two distinct C-S-H compositions can still be found by mlcroanalysis.

After further hydration a single CSH composition predominates.

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