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States of water in hydrated C3S (tricalcium silicate) as a function of relative humidity

Published online by Cambridge University Press:  03 March 2011

Norbert M. Nemes ,
Dan A. Neumann  and
Richard A. Livingston
Norbert M. Nemes
Affiliation:
Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742; and NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8562
Dan A. Neumann*
Affiliation:
NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-8562
Richard A. Livingston
Affiliation:
Office of Infrastructure R&D, Federal Highway Administration, McLean, Virginia 22101
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

Quasi-elastic neutron spectroscopy was used to study the changes in the water content of hydrated tricalcium silicate cement paste with decreasing relative humidity (RH). The structurally bound water was divided into water bound in Ca(OH)2 and in calcium-silicate hydrate, or C–S–H-gel, utilizing the inelastic vibrational modes of Ca(OH)2. The quasi-elastic line was analyzed in terms of free and constrained water, and both were observed to decrease as the pores empty of pore-water with drying. An inelastic line related to translational vibrations of immobile water molecules was also extracted from the spectra, and its intensity was found to decrease with lower RH.

Keywords

Neutron scattering
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 10 , October 2006 , pp. 2516 - 2523
Copyright
Copyright © Materials Research Society 2006

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References

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