摘要
通过等温吸附法和热重分析法对黄土表面结合水的类型和界限进行了划分,并针对结合水相关的物理力学性质进行了研究。试验结果表明,黄土在相对湿度小于0.59的湿度环境下吸附水汽所形成的水为强结合水,在相对湿度为0.59~0.98的湿度环境下吸附水汽所形成的水为弱结合水;强结合水所对应的绝对含水率的界限为0~2.70%,弱结合水所对应的绝对含水率的界限为2.70%~6.61%;强结合水的热失重区间为125℃~245℃,弱结合水的热失重区间为65℃~125℃。黄土的水合比重、结合水的密度均随着绝对含水率的增加而减小,水合后黄土的体积、黄土所吸附的结合水的体积、结合水膜的厚度均随着绝对含水率的增加而增加。
The objective of this study is to divide the types and boundaries of bound water on loess particle surface and to investigate their related physical and mechanical properties using the isothermal adsorption and thermogravimetric analyses. The results indicate that the water formed from the water vapor adsorbed on a loess particle with the relative humidity less than 0.59 is the strong bound water, and the water formed from the water vapor adsorbed on a loess particle with the relative humidity of 0.59 ~ 0.98 is the weak bound water. The absolute water content boundaries of the strong bound water and weak bound water are 0~2.70%and 2.70%~6.61%respectively. The thermo-gravimetric intervals of the strong bound water and weak bound water are 125℃~245℃and 65℃~125℃respectively. The hydrous specific gravity of hydrated loess and the density of the bound water decrease with the increase of the absolute water content. The volume of hydrated loess, volume of the bound water and thickness of the combined water film increase with the increase of the absolute water content.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2014年第5期942-948,共7页
Chinese Journal of Geotechnical Engineering
基金
国家自然科学基金项目(51078309
51278397)
关键词
黄土
结合水
等温吸附法
热重分析法
相对湿度
loess
bound water
isothermal adsorption
thermogravimetric analysis
relative humidity
