{"title":"离子土壤稳定剂改性膨润土水化过程中孔隙特性的演化","authors":"Wei Huang, Zili Feng, Huanran Fu, W. Xiang","doi":"10.1155/2021/7777091","DOIUrl":null,"url":null,"abstract":"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 \n \n 0\n <\n RH\n <\n 0.45\n ~\n 0.55\n \n , accompanied by the expansion of micropores. Then, adsorption occurred on the basal surface of the crystal layer in the range of \n \n 0.45\n ~\n 0.55\n <\n RH\n <\n 0.8\n ~\n 0.9\n \n , with water mainly adsorbed into the mesopores. With further hydration when \n \n RH\n >\n 0.8\n ~\n 0.9\n \n , 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.","PeriodicalId":7315,"journal":{"name":"Adsorption Science & Technology","volume":null,"pages":null},"PeriodicalIF":2.8000,"publicationDate":"2021-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"3","resultStr":"{\"title\":\"Evolution of Pore Characteristics for Bentonite Modified by an Ionic Soil Stabilizer during Hydration Processes\",\"authors\":\"Wei Huang, Zili Feng, Huanran Fu, W. Xiang\",\"doi\":\"10.1155/2021/7777091\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"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 \\n \\n 0\\n <\\n RH\\n <\\n 0.45\\n ~\\n 0.55\\n \\n , accompanied by the expansion of micropores. Then, adsorption occurred on the basal surface of the crystal layer in the range of \\n \\n 0.45\\n ~\\n 0.55\\n <\\n RH\\n <\\n 0.8\\n ~\\n 0.9\\n \\n , with water mainly adsorbed into the mesopores. With further hydration when \\n \\n RH\\n >\\n 0.8\\n ~\\n 0.9\\n \\n , 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.\",\"PeriodicalId\":7315,\"journal\":{\"name\":\"Adsorption Science & Technology\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":2.8000,\"publicationDate\":\"2021-10-04\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"3\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Adsorption Science & Technology\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://doi.org/10.1155/2021/7777091\",\"RegionNum\":4,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"CHEMISTRY, APPLIED\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Adsorption Science & Technology","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1155/2021/7777091","RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, APPLIED","Score":null,"Total":0}
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.
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.