黏土中结合水含量测试方法研究进展

State of the Art Review of Testing Methods of Bound Water Content in Clay

叙述了黏土中结合水的概念及特征,介绍了目前测量黏土中结合水含量的几种方法:容量瓶法、等温吸附法、热分析法、定性分析法、核磁共振法(NMR)和理论公式法,及这几种方法的优缺点、适用性、影响因素。综合不同测试方法总结发现,不同测量方法获得的结合水含量对比一般为:理论公式法<等温吸附法≈热分析法<容量瓶法,大量试验结果证明采用等温吸附法和热分析法的综合测量法获取的结果更准确。最后对影响黏土中结合水含量的因素进行了总结概况。可以预见,当前各类方法均存在一些局限性,而快速、准确测量黏土中结合水含量是未来发展的方向。

In this paper,the concept and characteristics of bound water in clayey soils are described.Representative methods of measuring the bound water content in clayey soils are introduced in detail.These methods are volumetric flask method;isothermal adsorption method;thermal analysis method;qualitative analysis method;nuclear magnetic resonance(NMR)method and theoretical formula method.Both advantages,disadvantages,characteristics and influencing factors of these methods are also discussed.It is found that the comparison of the bound water content obtained by different measurement methods is generally as follows:theoretical formula method<isothermal adsorption method≈thermal analysis method<volumetric flask method.A large number of test results prove that the results obtained by the comprehensive measurement methods using the isothermal adsorption method and the thermal analysis method are more accurate.Finally,the factors influencing the bound water content in clayey soils are summarized.It can be predicted that all methods have some limitations,and the rapid and accurate measurement of the bound water content in clayey soils is the future development direction.