Structural characterization of C-S-H gel through an improved deconvolution analysis of NMR spectra

The structure of the C-S-H gel in hydrated cement samples prepared with and without the addition of silica nanoparticles is studied in this work through the deconvolution of 29 Si MAS-NMR spectra. X-ray diffraction and energy dispersive X-ray microanalysis are also considered for the analysis. A met...

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Bibliographic Details
Published in:Journal of materials science 2014, Vol.49 (1), p.142-152
Main Authors: Pérez, Gloria, Guerrero, Ana, Gaitero, Juan J., Goñi, Sara
Format: Article
Language:English
Subjects:
Aluminum
Calcium silicate hydrate
Characterization and Evaluation of Materials
Chemical properties
Chemistry and Materials Science
Classical Mechanics
Component reliability
Crystallography and Scattering Methods
Deconvolution
Diffraction
Materials Science
Nanocomposites
Nanomaterials
Nanoparticles
Nanostructure
NMR
Nuclear magnetic resonance
Nuclear magnetic resonance spectroscopy
Polymer Sciences
Reliability analysis
Silicates
Silicon dioxide
Solid Mechanics
Spectra
Structural analysis
X-rays
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Summary:The structure of the C-S-H gel in hydrated cement samples prepared with and without the addition of silica nanoparticles is studied in this work through the deconvolution of 29 Si MAS-NMR spectra. X-ray diffraction and energy dispersive X-ray microanalysis are also considered for the analysis. A method with improved sensitivity and reliability is proposed for the deconvolution of the spectra into elementary components involving a good fitting of both the spectral curve and its second derivative. The increased sensitivity of the deconvolution proves to be especially interesting for the characterization of low concentration components in the NMR spectra, and the high reliability allows properly defining the effect of nanosilica addition on the C-S-H gel nanostructure. In fact, the addition of nanosilica is found to produce a pozzolanic reaction that results in an increase of the mean silicate chain length and an enhancement of the aluminum incorporation into the C-S-H gel phase.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-013-7688-8