{sup 17}O MAS NMR investigation of the structure of calcium silicate hydrate gel

Journal Article · Sat Jun 01 00:00:00 EDT 1996 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/j.1151-2916.1996.tb08768.x· OSTI ID:271671

Cong, X; Kirkpatrick, R J ^[1]

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1. Univ. of Illinois, Urbana, IL (United States)

This paper presents the results of a systematic investigation of the structure of hydrothermally synthesized calcium silicate hydrate gel using {sup 17}O MAS NMR at 11.7 T and MAS frequencies up to 12 kHz. The results support the previously proposed defect-tobermorite structural model for C-S-H. At least six O-sites have been identified, two NBO, BO, Ca-OH, Si-OH, and H{sub 2}O. The compositional variation of the relative intensities of the signal for different sites measured by {sup 17}O NMR is consistent with that calculated from {sup 29}Si NMR results for the same samples. The chemical shifts of the NBO and BO sites become more deshielded (more positive) with increasing C/S ratio.

• Sponsoring Organization: USDOE
• OSTI ID: 271671
• Journal Information: Journal of the American Ceramic Society, Vol. 79, Issue 6; Other Information: PBD: Jun 1996
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CALCIUM SILICATES
CRYSTAL STRUCTURE
HYDRATES
NUCLEAR MAGNETIC RESONANCE
QUADRUPOLE MOMENTS
ELECTRIC FIELDS
MAGNETIC FIELDS
FREQUENCY DEPENDENCE
X-RAY DIFFRACTION
PROBES
ISOTOPIC EXCHANGE
CRYSTAL MODELS