The influence of free water content on dielectric properties of alkali active slag cement paste

Jizhong Li; Yue Zhang; Xuemin Cui

doi:10.1007/s11595-006-4774-7

Journal of Wuhan University of Technology Materials Science Edition ›› 2007, Vol. 22 ›› Issue (4) : 774 -777. DOI: 10.1007/s11595-006-4774-7

Article

The influence of free water content on dielectric properties of alkali active slag cement paste

Jizhong Li ¹^,²^,^{^{^a}}
, Yue Zhang ¹
, Xuemin Cui ³

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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.

Keywords

alkali activated slag cement (AASC) / dielectric constant / dielectric loss / relative humidity / free water adsorption

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Jizhong Li, Yue Zhang, Xuemin Cui. The influence of free water content on dielectric properties of alkali active slag cement paste. Journal of Wuhan University of Technology Materials Science Edition, 2007, 22(4): 774-777 DOI:10.1007/s11595-006-4774-7

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References

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