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- W2023942088 abstract "The dielectric behaviour of mature Portland cement pastes prepared at water/cement ratios 0·3 to 0·7, and pastes containing various percentages of silica fume at water/cement ratio 0·3 was investigated over a frequency range of 1 MHz to 1·5 GHz. The value of dielectric constant is water content dependent. A linear correspondence between dielectric constant and evaporable water was obtained for water-saturated pastes. Experimental results relating dielectric constants to porosity for Portland cement pastes hydrated jor one year were in good agreement with Sen s approximation for rock, e.g. ϵ′ e = 1·5ϵ′ cp + P 1·5 (ϵ′ e = 1·5ϵ′ cp ), where ϵ′ e = the real part of the effective dielectric constant, ϵ′ w = the real part of the dielectric constant of water, ϵ′ cp = the real part of the dielectric constant of cement paste and P is the porosity Addition of silica fume appears to have a small and indirect effect on the dielectric constant value of the paste. This is due to the pore size effects and evaporable water content." @default.
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- W2023942088 date "1997-01-01" @default.
- W2023942088 modified "2023-10-16" @default.
- W2023942088 title "Dielectric behaviour of hardened cementitious materials" @default.
- W2023942088 doi "https://doi.org/10.1680/adcr.1997.9.33.1" @default.
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