Results 251 to 260 of about 45,573,897 (286)
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Effects of the temperature and relative humidity on the structure of CSH gel
Cement and Concrete Research, 1995Abstract This paper describes the structural changes of CSH caused by curing at different relative humidities (R. H.) and temperatures using XRD, 29Si NMR and thermal analysis. The results show that within the relative humidity range studied (9%–100%), the polymerization of CSH does not change, but that the local structure becomes more disordered
Xiandong Cong, R.James Kirkpatrick
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Dissolution kinetics of C–S–H gel: Flow-through experiments
Physics and Chemistry of the Earth, Parts A/B/C, 2014Abstract C–S–H gel dissolution kinetics was studied by means of flow-through experiments under CO2-free atmosphere at room temperature (23 ± 2 °C). The starting C–S–H gel was obtained by hydration of commercial C3S (3CaO·SiO2) and consisted of 67 wt% C–S–H with a Ca/Si ratio of 1.7 ± 0.1 and 33 wt% portlandite.
Ana Trapote-Barreira +2 more
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Nanopore in C-S-H Gel Stability Analysis of Hardened Cement Pastes
Key Engineering Materials, 2015Based on capillary tension, surface free energy and elasticity theory, a collapse model of nanopore in C-S-H gel was created in hardened cement pastes. The stability of pore was analyzed by Gibbs free energy theory. The results show that, the capillary is more stable while the capillary is grater and rounder in the case of the aperture changing in the ...
Lang Wu, Na Xiong, Fang Yan Yu
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Effect Investigation of Nanofillers on C-S-H Gel Structure with Si NMR
Journal of Materials in Civil Engineering, 2019AbstractThis paper aims to use Si29 nuclear magnetic resonance (NMR) for investigating the effect of nanofillers on the C-S-H gel structure of hardened cement paste, analyze the modification mechan...
Jialiang Wang +4 more
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Micromechanics of Hydrating Cement Pastes Considering C-S-H Gel Densification
CONCREEP 10, 2015Calcium-silicate-hydrate (C-S-H) gel densifies progressively during hydration. Considering that the available precipitation space may be the key parameter driving gel densification, the authors here use NMR relaxometry data in combination with basic stoichiometric relations of hydration chemistry, in order to develop a model for the evolution of C-S-H ...
M. Königsberger +2 more
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physica status solidi (a), 2007
AbstractThis work explores from a theoretical viewpoint the mechanical properties of the most important hydration product present in cementitious environments, the so called C‐S‐H (calcium‐silicate‐hydrate) gel. The dependence of the bulk (K), shear (G) and Young's (E) modulus for the C‐S‐H crystals respect to its composition and the length of its ...
Manzano, Hegoi +3 more
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AbstractThis work explores from a theoretical viewpoint the mechanical properties of the most important hydration product present in cementitious environments, the so called C‐S‐H (calcium‐silicate‐hydrate) gel. The dependence of the bulk (K), shear (G) and Young's (E) modulus for the C‐S‐H crystals respect to its composition and the length of its ...
Manzano, Hegoi +3 more
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Estimate the relative electrical conductivity of C–S–H gel from experimental results
Construction and Building Materials, 2014A general effective media (GEM) equation-based scheme is proposed to estimate the relative electrical conductivity of C–S–H gel in this study. It is highlighted that the relative electrical conductivity of the solid phase in cement paste can be treated as a constant only on the iso-degree of hydration basis.
Ma, Hongyan CIVL +3 more
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Hydration Activity of Silica Fume and its Effect on the Structure of C-S-H Gel
Applied Mechanics and Materials, 2013Hydration activity of silica fume(SF) and its effect on the structure of C-S-H gel in silica fume-cement (SFC)pastes was studied by FTIR and 29Si MAS NMR combined with deconvoluton technique, respectively. The experimental results indicate that the cement of 48% and the SF of 41% can react in the paste with SF replacement for cement was 10% by weight ...
Lei Wang, Zhen He, Jianjun Yan
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Mechanical Properties and Microstructure Characterization of Calcium Silicate Hydrate (C-S-H) Gel
Materials Science Forum, 2010The complex behavior of concrete is largely related to the mechanical response of calcium silicate hydrate (C-S-H) gel. During the past two decades, a great deal of efforts has been devoted to the structure of C-S-H at the nanoscale level, including both experiment investigation and molecular simulation.
Ling Qiao +3 more
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Molecular simulation on the calcium silicate hydrate (C-S-H) gel
2014Calcium silicate hydrate (C-S-H) gel, the important composition of the cement hydrate, contributes the most to the mechanical properties and durability of the cement-based materials. Due to the complex compositional and morphological nature of the gel, the intrinsic structure of the C-S-H gel has not been comprehensively understood yet. In this thesis,
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