The Structure, Stoichiometry and Properties of C-S-H Prepared by C3S Hydration Under Controlled Condition

Nonat, André; Lecoq, X.

doi:10.1007/978-3-642-80432-8_14

Cited by 44 publications

(53 citation statements)

References 15 publications

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“…However, reported values vary considerably, ranging from as low as 1.3 to as high as 2, those between 1.5 and 1.7-1.8 generally considered the most probably correct. Nonat and Lecoq [53] have attributed the higher values to a phase change in C-S-H at 20 mM Ca. However, other than this suggestion or the possibility of non-equilibrium conditions [46], no explanation for the variability in Ca/Si ratios at saturation in CH has been proposed.…”

Section: Unsettled Issuesmentioning

confidence: 99%

Solubility and structure of calcium silicate hydrate

Chen

Thomas

Taylor³

et al. 2004

Cement and Concrete Research

721

414

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C-S-H, the poorly crystalline calcium silicate hydrate formed in cement paste and aqueous suspension, is characterized by extensive disorder and structural variations at the nanometer scale. An analysis of new and published solubility data for C-S-H formed by different preparation methods and with a broad range of compositions illustrates a previously unrecognized family of solubility curves in the CaO-SiO 2 -H 2 O system at room temperature. As demonstrated by 29 Si magic-angle spinning (MAS) NMR data and by charge balance calculations, the observed differences in solubility arise from systematic variations in Ca/Si ratio, silicate structure, and Ca-OH content. Based on this evidence, the family of solubility curves are interpreted to represent a spectrum of metastable C-S-H phases whose structures range from purely tobermorite-like to largely jennite-like. These findings give an improved understanding of the structure of these phases and reconcile some of the discrepancies in the literature regarding the structure of C-S-H at high Ca/Si ratios.

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Section: Unsettled Issuesmentioning

confidence: 99%

Solubility and structure of calcium silicate hydrate

Chen

Thomas

Taylor³

et al. 2004

Cement and Concrete Research

721

414

View full text Add to dashboard Cite

show abstract

“…In fact, several models have been proposed so far [1,[3][4][5][6] that draw structural analogies with tobermorite and jennite crystals. Schematic representations of both crystals are depicted in Fig.…”

Section: Introductionmentioning

confidence: 99%

On the formation of cementitious C–S–H nanoparticles

Manzano

Ayuela

Dolado

2007

J Computer-Aided Mater Des

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This work explores from a theoretical viewpoint the underlying growth mechanisms which govern the formation of the most important hydration product present in cementitious environments, the so called C-S-H (calcium-silicate-hydrate) gel. Aiming at identifying the basic building blocks which make up the cementitious C-S-H gel, we have performed ab-initio calculations at the Hartree Fock (HF) level. Two different growth mechanisms have been identified depending on the amount of Si and Ca ions, which naturally lead to the appearance of tobermorite-like and jennite-like nano-crystals.

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“…29 Si magic angle spinning nuclear magnetic resonance (MAS NMR) and Raman spectroscopic studies of synthetic C-S-H with varying Ca/Si ratios have shown that samples with low Ca/Si ratios have, on average, long silicate chains and the silicate structure is dominated by Q 2 tetrahedra, while samples with high Ca/Si have, on average, shorter chains and their silicate structures are predominantly formed by Q 1 tetrahedra. 8,9,[16][17][18][19][20][21] The percentage of Q 1 becomes greater than the percentage of Q 2 when 1vCa/Siv1.2. 8,[16][17][18] A recent model for C-(A)-S-H(I) 7 has shown constraints for Ca/Si and the average silicate chain length in terms of the fraction of vacant tetra-hedral sites.…”

mentioning

confidence: 99%

Composition, silicate anion structure and morphology of calcium silicate hydrates (C-S-H) synthesised by silica-lime reaction and by controlled hydration of tricalcium silicate (C₃S)

Rodriguez

Richardson

Black

et al. 2015

Advances in Applied Ceramics

110

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The main product of Portland cement hydration is C-S-H. Despite constituting more than half of the volume of hydrated pastes and having an important role in strength development, very little is known about the factors that determine its morphology. To investigate the relationship between the chemical composition, silicate anion structure and morphology of C-S-H, samples were synthesised via silica-lime reactions and by the hydration of C 3 S under controlled lime concentrations and with/without accelerators. The silicate anion structure of the samples was studied by A relationship between the silicate anion structure and the morphology of C-S-H was found for the samples fabricated with accelerators.

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The Structure, Stoichiometry and Properties of C-S-H Prepared by C3S Hydration Under Controlled Condition

Cited by 44 publications

References 15 publications

Solubility and structure of calcium silicate hydrate

Solubility and structure of calcium silicate hydrate

On the formation of cementitious C–S–H nanoparticles

Composition, silicate anion structure and morphology of calcium silicate hydrates (C-S-H) synthesised by silica-lime reaction and by controlled hydration of tricalcium silicate (C₃S)

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The Structure, Stoichiometry and Properties of C-S-H Prepared by C3S Hydration Under Controlled Condition

Cited by 44 publications

References 15 publications

Solubility and structure of calcium silicate hydrate

Solubility and structure of calcium silicate hydrate

On the formation of cementitious C–S–H nanoparticles

Composition, silicate anion structure and morphology of calcium silicate hydrates (C-S-H) synthesised by silica-lime reaction and by controlled hydration of tricalcium silicate (C3S)

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Product

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Composition, silicate anion structure and morphology of calcium silicate hydrates (C-S-H) synthesised by silica-lime reaction and by controlled hydration of tricalcium silicate (C₃S)