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Application of Selective 29 Si Isotopic Enrichment to Studies of the Structure of Calcium Silicate Hydrate (C‐S‐H) Gels
Author(s) -
Brough Adrian R.,
Dobson Christopher M.,
Richardson Ian G.,
Groves Geoffrey W.
Publication year - 1994
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1994.tb07034.x
Subject(s) - carbonation , calcium silicate hydrate , silicate , calcium silicate , chemistry , hydrate , phase (matter) , solid state , mineralogy , analytical chemistry (journal) , inorganic chemistry , crystallography , chemical engineering , materials science , organic chemistry , cement , metallurgy , engineering
Selective isotopic enrichment of SiO 2 with 29 Si in a mixture with tricalcium silicate (C 3 S) has allowed the Si from this phase to be effectively labeled during the course of the hydration reaction, thus isolating its contribution to the reaction. A double Q 2 signal has been observed in 29 SI solid‐state MAS NMR spectroscopy of C‐S‐H gels of relatively low Ca/Si ratio, prepared by hydration or by carbonation of a C 3 S paste. The origin of the weaker, downfield peak is discussed and tentatively attributed to bridging tetrahedra of a dreierkette silicate chain structure.