离子土壤稳定剂改性膨润土水化过程中孔隙特性的演化

IF 2.8 4区 工程技术 Q2 CHEMISTRY, APPLIED
Wei Huang, Zili Feng, Huanran Fu, W. Xiang
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引用次数: 3

摘要

离子土壤稳定剂(ISS)用于加固粘土,因为离子土壤稳定剂可以调节粘土的水化过程和微观结构。为了评价ISS的调节作用,本研究采用不同浓度的ISS对天然膨润土进行改性。通过水蒸气吸附和X射线衍射(XRD)分析了膨润土的水化机理。同时,通过不同相对湿度下孔隙特征测试的变化,对水化孔隙结构和水化机理进行了关联分析,以区分相应水化过程中水的多尺度孔隙吸附。此外,还通过XRD、氮气吸附和汞注入测试研究了孔隙特性。最后,讨论了添加ISS后吸附水和孔隙结构发生变化的原因。结果表明,对于钙基膨润土,阳离子在0.8~0.9范围内首先水合,扩散双层水不断进入大孔。ISS加入膨润土后,吸附水和多尺度孔径均减小。还原的起源是ISS对可交换阳离子和晶体层基面的调节。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evolution of Pore Characteristics for Bentonite Modified by an Ionic Soil Stabilizer during Hydration Processes
An ionic soil stabilizer (ISS) is used to reinforce clay soils because the ISS can regulate the hydration processes and microstructures of clays. To evaluate the regulation of ISS, natural bentonite was modified by ISS at different concentrations in this research. Water vapour adsorption and X-ray diffraction (XRD) were carried out to interpret the hydration mechanism of bentonite. Meanwhile, an associated analysis between hydration pore structures and hydration mechanisms was implemented through variation of pore characteristic tests at different relative humidities (RHs) to distinguish multiscale pore adsorption of water during the corresponding hydration process. In addition, the pore characteristics were studied via XRD, nitrogen adsorption, and mercury injection tests. Finally, the origins that adsorbed water and pore structures changed by adding ISS were discussed. The results showed that for calcium bentonite, the cations hydrated first in the range of 0 < RH < 0.45 ~ 0.55 , accompanied by the expansion of micropores. Then, adsorption occurred on the basal surface of the crystal layer in the range of 0.45 ~ 0.55 < RH < 0.8 ~ 0.9 , with water mainly adsorbed into the mesopores. With further hydration when RH > 0.8 ~ 0.9 , diffused double layer (DDL) water ceaselessly entered the macropores. Both adsorbed water and multiscale pore size decreased when ISS was added to bentonite. The origins of the reduction were the regulation of ISS to exchangeable cations and the basal surface of the crystal layer.
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来源期刊
Adsorption Science & Technology
Adsorption Science & Technology 工程技术-工程:化工
CiteScore
5.00
自引率
10.30%
发文量
181
审稿时长
4.5 months
期刊介绍: Adsorption Science & Technology is a peer-reviewed, open access journal devoted to studies of adsorption and desorption phenomena, which publishes original research papers and critical review articles, with occasional special issues relating to particular topics and symposia.
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