岩土工程学报2012，Vol.34Issue(10)：1887-1895,9.
离子土固化剂对膨胀土结合水影响机制研究
Effect of ionic soil stabilizer on bound water of expansive soils
摘要
Abstract
The "water vapor adsorption isotherm - TG, DSC" method is proposed to define and investigate the type of bound water of typical Anyang weak expansive soils. A comparative analysis of the distribution characteristics and amount of bound water is made between the original soil and ISS-soil. From the perspective of water molecular structure vibration and based on the theory of Fourier transform infrared spectroscopy, the rationality of the proposed method is also qualitatively validated. Finally, the effect of ISS on the bound water is interpreted in terms of the change of the clay mineral composition and surface physicochemical property. The test results indicate that the distribution state and property of the boundwaer will alter at specific relative humidity interval. According to the TG - DSC curve, the bound water can be divided into three types at different elevated temperature ranges, i.e., strongly bound water, transitional bound water and weakly bound water. After modification, the strongly bound water remains consistent while the transitional and weakly bound water significantly decreases. The ISS weakens the capacity and ability of hydration of outer surface and interlayer of expansive clay mineral and hence effectively inhibits the swelling potential induced by the soil hydration.关键词
离子固化剂/膨胀土/水汽吸附/结合水/黏土矿物Key words
ionic soil stabilizer/expansive soil/water vapor adsorption/bound water/clay mineral分类
建筑与水利引用本文复制引用
刘清秉,项伟,崔德山..离子土固化剂对膨胀土结合水影响机制研究[J].岩土工程学报,2012,34(10):1887-1895,9.基金项目
国家自然科学基金项目 （）
中央高校基本科研业务费专项资金资助项目 （）
教育部高等学校博士学科专项科研基金项目 （）
