Hydrogen cluster/network in tobermorite as studied by multiple-quantum spin counting 1H NMR

Proton multiple-quantum (MQ) spin-counting experiment has been employed to study arrangement of hydrogen atoms in 9Å/11Å natural/synthetic tobermorites. Even though all tobermorite samples give similar characterless, broad static-powder 1H NMR spectra, their MQ spin-counting spectra are markedly dif...

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Bibliographic Details
Published in:Cement and concrete research 2014-12, Vol.66, p.115-120
Main Authors: Mogami, Yuuki, Yamazaki, Satoru, Matsuno, Shinya, Matsui, Kunio, Noda, Yasuto, Takegoshi, K.
Format: Article
Language:English
Subjects:
Calcium-silicate-hydrate (C-S-H) (B)
Characterization (B)
Microstructure (B)
Spectroscopy (B)
Thermal treatment (A)
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Summary:Proton multiple-quantum (MQ) spin-counting experiment has been employed to study arrangement of hydrogen atoms in 9Å/11Å natural/synthetic tobermorites. Even though all tobermorite samples give similar characterless, broad static-powder 1H NMR spectra, their MQ spin-counting spectra are markedly different; higher quanta in 11Å tobermorite do not grow with the MQ excitation time, while those in 9Å one do. A statistical analysis of the MQ results recently proposed [26] is applied to show that hydrogens align in 9Å tobermorite one dimensionally, while in 11Å tobermorite they exist as a cluster of 5–8 hydrogen atoms.
ISSN:0008-8846
1873-3948
DOI:10.1016/j.cemconres.2014.07.023