We agree with all Dr. Bensted's comments, with one minor exception : the carbonation that he mentioned probably occurred largely during preparation, as Brunauer and Greenberg's (I) original analysis showed 0.6% C02, and this would probably have been sufficient to have produced the infrared band obs
Calcium silicate hydrate (II) (“C-S-H(II)”)
✍ Scribed by J.A. Gard; H.F.W. Taylor
- Book ID
- 102995033
- Publisher
- Elsevier Science
- Year
- 1976
- Tongue
- English
- Weight
- 659 KB
- Volume
- 6
- Category
- Article
- ISSN
- 0008-8846
No coin nor oath required. For personal study only.
✦ Synopsis
This semicrystalline phase, originally named 'calcium silicate hydrate(II)' by Taylor (1950), has been studied with X-rays, electron optics, chemical investigation of silicate anion type, infrared spectra, and thermal methods.
It is structurally related to jennite (C9S6H11) and probably also to the fibrous C-S-H of cement pastes, the three phases forming a sequence of decreasing crystallinity.
The specimen studied had approximate composition C2SH3. 2 after standing over saturated CaC6 2 at about 15°C. C-S-H(II) contains metasilicate chains and pyrosilicate groups and has a disordered layer structure. Much of the water can be lost reversibly without significant change in lattice parameters.
Diese halbkristalline
Phase, zuerst yon Taylor (1950) Calcium Silikat Hydrat(II) genannt, wurde mit I! Rontgenstrahlen, Elektronoptik, chemischer Untersuchung des Types der Silikatanionen, Infrarotspektren, und thermischen Methoden untersucht. Sic ist mit Jennit (C9S6Hll) sowie wahrscheinlich auch mit dem faserigen C-S-H in Zementpasten strukturverwandt; die drei Phasen bilden eine Sequenz yon abnehmender Kristallinit~t. Die verwendete Probe hatte eine Z I! . usammensetzung von ungef~hr C2SHq 2 nach dem sic If ! uber ges~ttigtem CaC62 bei ungef~r 15°C gestanden --tt • .
hatte. C-S-H(II) enthalt Metas111katketten und Pyrosilikatgruppen und hat eine ungeordnete Schichtstruktur.
Das meiste Wasser kann ohne nennenswerte Ver~nderung der Kristallgitterparameter reversibel abgegeben werden.
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