离子固化剂改性蒙脱土吸附水特性及持水模型研究

黄伟; 刘清秉; 项伟; 张云龙; 王臻华; DAOMinhHuan

doi:10.11779/CJGE201901013

离子固化剂改性蒙脱土吸附水特性及持水模型研究 English Version

1.中国地质大学（武汉）工程学院,湖北武汉 430074;
2.中国地质大学教育部长江三峡库区地质灾害研究中心,湖北武汉 430074

基金项目: 国家自然科学基金项目（41572286,41672297,41202199）;湖北省自然科学基金项目（2015CFB247）

详细信息

作者简介:
黄伟(1990- ),男,博士研究生,主要从事黏土物化性质及特殊土改良方面的研究工作。E-mail：22huangwei@163.com。

通讯作者:
刘清秉，E-mail：liuqingbing_1357@163.com

中图分类号: TU443
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出版历程
- 收稿日期: 2017-11-06
- 发布日期: 2019-01-24

Water adsorption characteristics and water retention model for montmorillonite modified by ionic soil stabilizer

1.Faculty of Engineering, China University of Geosciences, Wuhan 430074, China;
2.Three Gorges Research Center for Geo-hazard, Ministry of Education, China University of Geosciences, Wuhan 430074, China

摘要

摘要: 采用不同浓度离子固化剂对天然钙蒙脱土进行改性处理,开展素土与改性土在相对湿度（P/P₀）0.01~0.95区间的水汽等温吸—脱附试验,通过持水速率曲线、晶层d₀₀₁演化曲线及红外光谱特征峰解析蒙脱土吸附水进程中主控因素的演化规律,据此提出水合状态变化的界限相对湿度区间,在此基础上,分别从阳离子水化能和晶层表面水合能角度,建立了离子固化剂改性蒙脱土微观持水方程。试验结果表明：对于钙蒙脱土,在0<P/P₀<0.15~0.2,阳离子与水分子结合形成单层“水化壳”;在0.15~0.2<P/P₀<0.45~0.5,阳离子形成2层“水化壳”;当0.45~0.5<P/P₀<0.8~0.9,晶层基面进一步吸附水分子形成2层完整水化膜。在极高吸力段（ψ>200 MPa）,蒙脱土持水能力只受控于层间阳离子水化作用,而在中高吸力段（15 MPa<ψ<200 MPa）,晶层基面与水之间的分子作用力是影响蒙脱土表面水合能及持水性状的主要因素。在特定吸力范围内,离子固化剂通过改变相应的物化性质参数（阳离子交换量、比表面积）从而弱化蒙脱土持水能力。基于微观水合机制所构建的持水方程能够很好预测本次试验及文献报道的数据结果,不同吸力段的持水模型可量化表征离子固化剂对蒙脱土吸附水性状的调控机理。
- 离子固化剂 /
- 阳离子 /
- 晶层基面 /
- 水合机制 /
- 吸附水 /
- 持水模型
Abstract: The natural montmorillonite is modified by the ionic soil stabilizer (ISS) with different concentrations and the isothermal water vapor adsorption tests are conducted for both the raw and modified soils under the relative humidity (P/P₀) ranging from 0.01 to 0.95. The evolution of the dominated factors in the process of hydration of montmorillonite is interpreted by combining the analyses of variation of d₀₀₁ with P/P₀, water retention velocity curves and results of infrared spectroscopy (IR). Finally, the boundary values of P/P₀ in hydration sequences are proposed, and the water retention equations are derived through hydration energy of cations and surface of minerals, respectively. The results show that for the calcium montmorillonite, the exchangeable cations interact with water molecules to form monolayer of hydration shell at the range of 0<P/P₀<0.15~0.2 firstly and then form bilayer at 0.15~0.2<P/P₀<0.45~0.5, followed by hydration on basal surface of crystal layer at 0.45~0.5<P/P₀<0.8~0.9 to form the integrated bilayer water film. The water retention capacity is dominated by the hydratability of interlamellar cations merely at extremely high suction range (ψ>200 MPa), and mainly influenced by the Van der Waals force between basal surface and water molecules when suction is lower (15<ψ<200 MPa). At a certain suction range, ISS weakens the water retention capacity of montmorillonite by changing the specific physic-chemical parameters. The derived water retention equations can accurately predict the test results and also provide a quantitative insight into the mechanism of action by ISS.
- ionic soil stabilizer /
- cation /
- basal surface of crystal layer /
- hydration mechanism /
- adsorption water /
- water retention model

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