A high resolution 29Si NMR study of the hydration of tricalciumsilicate

Lippmaa, É.; Mägi, Μ.; Tarmak, M.; Wieker, W.; Grimmer, A.‐R.

doi:10.1016/0008-8846(82)90020-5

Cited by 139 publications

(39 citation statements)

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“…Several contributions to the hydration and hardening of cement pastes as determined by using 27 Al and 29 Si NMR methods are available in the literature [19][20][21][22][25][26][27][28]. Here, we extend these to organically modified systems to monitor the influence of the organic components on the cement paste at the molecular level.…”

Section: Introductionmentioning

confidence: 97%

Solid state NMR investigations on the role of organic admixtures on the hydration of cement pastes

Rottstegge

Wilhelm

Spiess

2006

Cement and Concrete Composites

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Section: Introductionmentioning

confidence: 97%

Solid state NMR investigations on the role of organic admixtures on the hydration of cement pastes

Rottstegge

Wilhelm

Spiess

2006

Cement and Concrete Composites

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“…The literature suggests an even lower degree of polymerization in solids equilibrated on curve A. For example, Brown et al [77] measured solubility during the first 4h of C 3 S hydration and produced data exclusively on curve A; since 29 Si NMR studies [50,[85][86][87] have shown that the first C-S-H product after the induction period is dimeric, the mean chain lengths associated with solids equilibrated on curve A must be low, most likely reaching a minimum value of 2 at CH saturation. This conclusion is supported from a 29 Si NMR study [88], which showed that the mean silicate chain lengths in double decomposition-derived C-S-H specimens with nominal Ca/Si ratios of 0.79-1.5 were 2.8-2.2.…”

Section: Hypothesis For Structural Variations In C-s-h At High Ca/si mentioning

confidence: 99%

Solubility and structure of calcium silicate hydrate

Chen

Thomas

Taylor³

et al. 2004

Cement and Concrete Research

737

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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“…If the reference sample were normalized to the density of the water adhered one by multiplying its bending strength by 1.192 [as a result of (1.86/1.78) 4 ] even though its new bending strength (3.5 MPa) would be inferior to that of a water adhered sample (8.0 MPa). This result reinforces the role of water in the adhesion of cementitious surfaces.…”

Section: Resultsmentioning

confidence: 99%

“…Thereafter, this slightly moistened cement powder was sieved (Tyler #30, <500µm) and then allowed to hydrate in a loose way inside a sealed plastic bag. Hydration was attested by nuclear magnetic resonance ( 29 Si MAS-NMR, see [4] as a reference for NMR measurements) after 7 days, as shown in Figs. 1a and 1b.…”

Section: Methodsmentioning

confidence: 99%

Adesão assistida por ligação de hidrogênio em materiais à base de cimento Portland

Rossetto

Pandolfelli²

2011

Cerâmica

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Adhesion is a physical-chemical parameter able to render innovations to Portland cement-based materials. However, this concept still lacks experimental evidence to underlie further developments in this subject. This work has demonstrated how distinct substances can impart different adhesion forces after evaluating the hydration degree and the mechanical strength of non-reactive cementitious materials. The substances capable of making tridimensional hydrogen bonds, such as water, for instance, were the most effective in providing cementitious samples with improved bending strength. It implies that water is not only important because of its role in cement hydration, but also because it develops adhesion between hydrated cementitious surfaces. More than speculating the fundamental understanding on adhesion in Portland cement-based materials, the present paper intends to stimulate thinking on how to take the benefits of the water confined between the hydrated cementitious surfaces as an in-built nanoadhesive, so far little explored, but at the same time so prone to yield high performance materials.

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A high resolution 29Si NMR study of the hydration of tricalciumsilicate

Cited by 139 publications

References 1 publication

Solid state NMR investigations on the role of organic admixtures on the hydration of cement pastes

Solid state NMR investigations on the role of organic admixtures on the hydration of cement pastes

Solubility and structure of calcium silicate hydrate

Adesão assistida por ligação de hidrogênio em materiais à base de cimento Portland

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