Journal ArticleDOI
Proposed Structure for Calcium Silicate Hydrate Gel
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TLDR
In this article, a disordered layer structure of Calcium silicate hydrate gel is presented, in which most of the layers are structurally imperfect ones of jennite (Ca9Si6O32H22), and others are similarly related to 1.4-nm tobermorite, both structures being modified by omission of many of their silicate tetrahedra.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.read more
Citations
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Journal ArticleDOI
Structure of Calcium Silicate Hydrate (C‐S‐H): Near‐, Mid‐, and Far‐Infrared Spectroscopy
TL;DR: In this paper, the mid-, near-, and far-infrared (IR) spectra of synthetic, single-phase calcium silicate hydrates (C-S-H) with Ca/Si ratios (C/S) of 0.41-1.2 were analyzed.
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The calcium silicate hydrates
TL;DR: In this article, a number of models for the nanostructure of C-S-H are summarized and compared and it is shown that there is much more of a consensus than might seem apparent at first sight.
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Tobermorite/jennite- and tobermorite/calcium hydroxide-based models for the structure of C-S-H: applicability to hardened pastes of tricalcium silicate, β-dicalcium silicate, Portland cement, and blends of Portland cement with blast-furnace slag, metakaolin, or silica fume
TL;DR: In this article, the applicability of the tobermorite-jennite (T/J) and T/CH viewpoints for the nanostructure of C-S-H present in real cement pastes is discussed.
Journal ArticleDOI
The nature of C-S-H in hardened cements
TL;DR: In this paper, the morphology, composition, and nanostructure of C-S-H in a range of hardened cements were investigated. But the authors focused on the inner product (Ip) of a slag-based mixture of Portland cement and slag.
Journal ArticleDOI
A model for the microstructure of calcium silicate hydrate in cement paste
TL;DR: In this paper, a model for the structure of calcium silicate hydrate (C-S-H) as it is formed during the hydration of Portland cement is proposed, which is a simplified representation of the microstructure within the size range of about 1 to 100 nm.
References
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Journal ArticleDOI
The crystal structure of the 11 a natural tobermorite ca2.25-(si3o7.5(oh)1.5).1h2o
Journal ArticleDOI
Crystal Structure of Tobermorite
H. D. Megaw,C. H. Kelsey +1 more
TL;DR: The authors examined the crystal structure of tobermorite, using crystals given to us by Mr. J. D. C. McConnell, who has published a preliminary description of them1.
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ESCA and SEM studies on early C3S hydration
TL;DR: In this article, high-resolution Scanning Electron Microscopy (SEM) was used to explore the phenomena occuring on the C3S ∗ surface in the very early stages of hydration.
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The hydrated calcium, silicates riversideite, tobermorite, and plombierite.
TL;DR: Taylor et al. as discussed by the authors showed that three distinct hydration levels exist within the "calcium silicate hydrate (l)" group of artificial preparations and showed that the individual hydrates may be distinguished from the position of the 002 reflection in X-ray powder photographs.
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Calcium silicate hydrate (II) (“C-S-H(II)”)
J.A. Gard,H. F. W. Taylor +1 more
TL;DR: 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 as discussed by the authors.