Effect of water on dielectric performances of alkali active slag cement materials (I)

被引：0

作者：

Cui, Xuemin ^{[1
]}

Qiu, Shuheng ^{[1
]}

Cao, Deguang ^{[1
]}

Zhou, Ji ^{[2
]}

机构：

[1] School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China

[2] State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China

来源：

Kuei Suan Jen Hsueh Pao/ Journal of the Chinese Ceramic Society | 2007年 / 35卷 / 06期

关键词：

Absorption - Atmospheric humidity - Ceramic materials - Dielectric losses - Dielectric properties - Differential thermal analysis - Low temperature drying - Permittivity - Thermogravimetric analysis - Water vapor;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Dielectric performances of hardening alkali active slag cement (AASC) paste were studied. The experimental results show the drying method (100°C for 4 h) that could depress the effect of free-water on the dielectric performances of the AASC. The dielectric frequency also shows the dielectric constant (Εr) is 6-8 and the dielectric loss (tanδ) is 0.02-0.04 at high frequency. With the increase of deposition time in air with a relative humidity of about 40%, the AASC would absorb the water vapor in the air. The saturated absorption is about 1.2% in mass (the same below), so the Εr and tanδ increased rapidly. Therefore, the low temperature drying method could not completely eliminate the absorption of the AASC paste. In addition, the dried AASC paste still contained about 2% hydrate water of hydration that was proved by the differential thermal analysis and thermogravimetry analysis, so, the tanδ of the AASC paste was higher than ceramic material.

引用

页码：791 / 795