Surface magnetic relaxation in cement pastes

Kenneth S. Mendelson; William P. Halperin; Jyh Yuar Jehng; Yi Qiao Song

doi:10.1016/0730-725X(94)91517-2

Surface magnetic relaxation in cement pastes

Kenneth S. Mendelson^*, William P. Halperin, Jyh Yuar Jehng, Yi Qiao Song

^*Corresponding author for this work

Physics and Astronomy

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

Surface magnetic relaxation in porous media is usually attributed to hindered rotation or to paramagnetic impurities on the surface. In cement pastes, however, it seems reasonable to attribute surface relaxation to dipole interactions in water adsorbed as water of hydration on grain surfaces. The rate limiting factor would then be the exchange rate between mobile water in the pores and adsorbed water. The hydrate relaxation time is 17 μs while the measured surface relaxation time is 30-40 μs. This difference is explained if the exchange time between mobile and adsorbed water is about the same as the relaxation time of the water of hydration. The exchange model also suggests that the surface relaxation time should decrease with temperature. Measurements testing this theory are now being prepared.

Original language	English (US)
Pages (from-to)	207-208
Number of pages	2
Journal	Magnetic Resonance Imaging
Volume	12
Issue number	2
DOIs	https://doi.org/10.1016/0730-725X(94)91517-2
State	Published - 1994

Keywords

NMR
Surface relaxation

ASJC Scopus subject areas

Biophysics
Biomedical Engineering
Radiology Nuclear Medicine and imaging

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10.1016/0730-725X(94)91517-2

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abstract = "Surface magnetic relaxation in porous media is usually attributed to hindered rotation or to paramagnetic impurities on the surface. In cement pastes, however, it seems reasonable to attribute surface relaxation to dipole interactions in water adsorbed as water of hydration on grain surfaces. The rate limiting factor would then be the exchange rate between mobile water in the pores and adsorbed water. The hydrate relaxation time is 17 μs while the measured surface relaxation time is 30-40 μs. This difference is explained if the exchange time between mobile and adsorbed water is about the same as the relaxation time of the water of hydration. The exchange model also suggests that the surface relaxation time should decrease with temperature. Measurements testing this theory are now being prepared.",

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AU - Mendelson, Kenneth S.

AU - Halperin, William P.

AU - Jehng, Jyh Yuar

AU - Song, Yi Qiao

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Y1 - 1994

N2 - Surface magnetic relaxation in porous media is usually attributed to hindered rotation or to paramagnetic impurities on the surface. In cement pastes, however, it seems reasonable to attribute surface relaxation to dipole interactions in water adsorbed as water of hydration on grain surfaces. The rate limiting factor would then be the exchange rate between mobile water in the pores and adsorbed water. The hydrate relaxation time is 17 μs while the measured surface relaxation time is 30-40 μs. This difference is explained if the exchange time between mobile and adsorbed water is about the same as the relaxation time of the water of hydration. The exchange model also suggests that the surface relaxation time should decrease with temperature. Measurements testing this theory are now being prepared.

AB - Surface magnetic relaxation in porous media is usually attributed to hindered rotation or to paramagnetic impurities on the surface. In cement pastes, however, it seems reasonable to attribute surface relaxation to dipole interactions in water adsorbed as water of hydration on grain surfaces. The rate limiting factor would then be the exchange rate between mobile water in the pores and adsorbed water. The hydrate relaxation time is 17 μs while the measured surface relaxation time is 30-40 μs. This difference is explained if the exchange time between mobile and adsorbed water is about the same as the relaxation time of the water of hydration. The exchange model also suggests that the surface relaxation time should decrease with temperature. Measurements testing this theory are now being prepared.

KW - NMR

KW - Surface relaxation

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Surface magnetic relaxation in cement pastes

Abstract

Keywords

ASJC Scopus subject areas

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