FLR technique: Exchange kinetics of ethanol/fluorescent dye with water in water-saturated cement paste examined by 1H- and 2H-NMR

A water-saturated cement paste (water-to-cement, w/c=1.0) confined in a solution of ethanol saturated with a fluorescent dye showed complete exchange of water after 2 days. The exchange rates of water and ethanol were independent of the presence of dye and determined to be 42×10 −8 and 60×10 −8 cm 2...

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Bibliographic Details
Published in:Cement and concrete research 2002, Vol.32 (5), p.795-801
Main Authors: Hansen, Eddy W., Gran, Hans.Chr
Format: Article
Language:English
Subjects:
Applied sciences
Buildings. Public works
Cement concrete constituents
Cement paste
Cements
Diffusion
Exact sciences and technology
Exchange
Materials
Pore solution
Properties and test methods
Properties of anhydrous and hydrated cement, test methods
Spectroscopy
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Summary:A water-saturated cement paste (water-to-cement, w/c=1.0) confined in a solution of ethanol saturated with a fluorescent dye showed complete exchange of water after 2 days. The exchange rates of water and ethanol were independent of the presence of dye and determined to be 42×10 −8 and 60×10 −8 cm 2/s, respectively. The exchange rate of dye was significantly smaller, by a factor of two to three. The exchange process resulted in a partitioning of the concentration of dye in ethanol within cement and bulk of (0.46+0.20). 1H-NMR spectral analysis of the dye before and after exchange suggests the dye to be inert, i.e., it does not react with the cement paste. Furthermore, no indication of a reaction between ethanol and cement paste is observed.
ISSN:0008-8846
1873-3948
DOI:10.1016/S0008-8846(02)00708-1