Abstract
The dielectric performance of alkali activated slag (AAS) cement paste was investigated in the frequency range of 1 to 1000 MHz. The experimental results showed the unstable dielectric properties of harden paste were mostly influenced by the fraction of free water in paste or absorbed water from ambient, but not including hydration water and microstructure. The free water was completely eliminated by heat treatment at 105 °C about 4 hours, and then its dielectric loss was depressed; but with the exposure time in air increasing, the free water adsorption in ambient air made the dielectric property of harden cement paste to be bad. The temperature and relative humidity of environment was the key factors of free water adsorption; hence, if the influence of free water on dielectric constant was measured or eliminated, the cement-based materials may be applied in humidity sensitive materials or dielectric materials domains.
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References
S D Wang, K L Scrivener. Hydration Products of Alkali Actived Slag Cement[J]. Cement and Concrete Research, 1995, 25: 561–571
A Berg, G A Niklasson, K Brantervik, et al. Dielectric Properties of Cement Motar as a Function of Water Content[J]. J. Appl. Phys., 1992, 71: 5897–5903
P Gu, J J Beaudoin. Dielectric Behavior of Hardened Cement Paste Systems[J]. J. Mater. Sci. Lett., 1996, 15: 182–183
N Miura, N Shinyashiki, S Yagihara, et al. Microwave Dielectric Study of Water Structure in the Hydration Process of Cement[J]. J. Am. Ceram. Soc., 1998, 81: 213–216
S Wen, D D L Chung. Pyroelectric Behavior of Cementbased Materials[J]. Cement and Concrete Research, 2003, 33: 1675–1679
V Janoo, C Korhonen, M Hovan. Measurement of Water Content in Portland Cement Concrete[J]. Journal of Transportation Engineering, 1999, 3: 245–249
D D L Chung. Review: Functional Properties of Cement-matrix Composites[J]. J. Mater. Sci., 2001, 36: 1315–1324
S Wen, D D L Chung. Cement-based Materials for Stress by Dielectric Measurement[J]. Cement and Concrete Research, 2002, 32: 1429–1433
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Li, J., Zhang, Y. & Cui, X. The influence of free water content on dielectric properties of alkali active slag cement paste. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 22, 774–777 (2007). https://doi.org/10.1007/s11595-006-4774-7
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DOI: https://doi.org/10.1007/s11595-006-4774-7