Abstract
A water saturated cement paste (w/c = 0.7) confined in a solution of methanol saturated with a fluorescent dye showed complete exchange of water after 10 days. However, after exchange the concentration of dye within the cement paste was less than 50% compared to the expected equilibrium value. This result is rationalized by the much larger solubility of dye in methanol compared to water, by more than two orders of magnitude. The diffusion of dye into the cement paste is thus a rather complex process, likely to involve precipitation at the water/methanol interphase, followed by an increasing solubility as more methanol enters the cement paste. The 1H nuclear magnetic resonance spectral analysis suggests that methanol and/or dye reacts with the cement paste.
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