Experimental Study on the Swelling Performance of Gaomiaozi Bentonite Buffer Material under Fe(II) Reducing Environment

Experimental Study on the Swelling Performance of Gaomiaozi Bentonite Buffer Material under Fe(II) Reducing Environment | Research Square window.SnipcartSettings = { analytics: { enabled: false } }; (function() { var accessVector = localStorage.getItem('access_vector') || ''; window.dataLayer = window.dataLayer || []; if (accessVector) { window.dataLayer.push({ user: { profile: { profileInfo: { snid: accessVector } } } }); } })(); (function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-K279D39R'); Browse Preprints In Review Journals COVID-19 Preprints AJE Video Bytes Research Tools Research Promotion AJE Professional Editing AJE Rubriq About Preprint Platform In Review Editorial Policies Our Team Advisory Board Help Center Sign In Submit a Preprint Cite Share Download PDF Article Experimental Study on the Swelling Performance of Gaomiaozi Bentonite Buffer Material under Fe(II) Reducing Environment Zhang Ming, Hu Dongke, Xie Jingli, Zhou Fangliang This is a preprint; it has not been peer reviewed by a journal. https://doi.org/ 10.21203/rs.3.rs-4525258/v1 This work is licensed under a CC BY 4.0 License Status: Posted Version 1 posted You are reading this latest preprint version Abstract The release of Fe(II) from iron-based disposal canisters during the operational period of high-level radioactive waste (HLW) repositories may affect the swelling behavior of the buffer barrier, consequently impacting repository safety and stability. In this study, we employed a self-made dilatometer to measure the swelling characteristics of GMZ24 bentonite under varying Fe(II) concentrations. Our test results indicate that with increasing Fe(II) concentration, the time required for GMZ24 bentonite to swell decreases, while the final swelling pressure and swelling ratio exhibit an exponential decline. Through hydrochemical detection and mineralogical analysis, it is found that the decrease of swelling performance of bentonite is mainly due to the cation exchange between Na+ and Fe(II) in bentonite and the isomorphic replacement of Montmorillonite crystal and Fe(II) to generate chlorite. Finally, based on the double electrical layer theory, we derived a functional relationship describing the variation in swelling pressure and swelling ratio of GMZ24 bentonite as a function of Fe(II) concentration. This study provides a scientific basis for predicting and controlling the swelling behavior of buffer backfill materials in HLW repositories. Physical sciences/Engineering/Civil engineering Earth and environmental sciences/Environmental sciences/Environmental chemistry/Pollution remediation high-level radioactive waste repository bentonite Fe(II) swelling performance mineral phase transformation Full Text Additional Declarations No competing interests reported. Cite Share Download PDF Status: Posted Version 1 posted You are reading this latest preprint version Research Square lets you share your work early, gain feedback from the community, and start making changes to your manuscript prior to peer review in a journal. As a division of Research Square Company, we’re committed to making research communication faster, fairer, and more useful. We do this by developing innovative software and high quality services for the global research community. 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Also discoverable on Platform About Our Team In Review Editorial Policies Advisory Board Help Center Resources Author Services Accessibility API Access RSS feed Manage Cookie Preferences © Research Square 2026 | ISSN 2693-5015 (online) Privacy Policy Terms of Service Do Not Sell My Personal Information {"props":{"pageProps":{"initialData":{"identity":"rs-4525258","acceptedTermsAndConditions":true,"allowDirectSubmit":true,"archivedVersions":[],"articleType":"Article","associatedPublications":[],"authors":[{"id":316125353,"identity":"30a7f9f9-e1f4-430d-9e3a-9bc030869ac6","order_by":0,"name":"Zhang Ming","email":"data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAZAAAAAyAQMAAABI0h/eAAAABlBMVEX///8AAABVwtN+AAAACXBIWXMAAA7EAAAOxAGVKw4bAAAA50lEQVRIiWNgGAWjYDACCRjJ3gBmMTYQr4XnAGlaQIwEIrXIz25+9vBrjkWefOTzZxI/GGxkNxxgfvYAnxbGOcfMjWW3SRQb3k5Ik+xhSDPecIDN3ACfFmaJBDNpyW0SiRtnJxyT4GE4nLjhAA+bBD4tbBLp3yBaZh5sk/zD8J+wFh6JHDPJj0At8yWY2aR5GA4Q1iIhkVMmzQjUsoEnjdlaxiDZeOZhNjO8WuRnpG+T/LmtLnF++/GHN99U2Mn2HW9+hlcLCDDzAAmDAyAmKKiYCakHAsYfIOsaiFA5CkbBKBgFIxMAAFJSRSjEVsUBAAAAAElFTkSuQmCC","orcid":"","institution":"Zhengzhou University of Aeronautics","correspondingAuthor":true,"prefix":"","firstName":"Zhang","middleName":"","lastName":"Ming","suffix":""},{"id":316125354,"identity":"aa1950b6-90e8-4040-b800-7a6f602e28e1","order_by":1,"name":"Hu Dongke","email":"","orcid":"","institution":"Zhengzhou University of Aeronautics","correspondingAuthor":false,"prefix":"","firstName":"Hu","middleName":"","lastName":"Dongke","suffix":""},{"id":316125355,"identity":"70f8a892-1808-46ff-8437-fd8a04068730","order_by":2,"name":"Xie Jingli","email":"","orcid":"","institution":"Beijing Research Institute of Uranium Geology","correspondingAuthor":false,"prefix":"","firstName":"Xie","middleName":"","lastName":"Jingli","suffix":""},{"id":316125356,"identity":"ab02678a-1f93-46f8-8fe1-599d7ebbff23","order_by":3,"name":"Zhou Fangliang","email":"","orcid":"","institution":"Zhengzhou University of Aeronautics","correspondingAuthor":false,"prefix":"","firstName":"Zhou","middleName":"","lastName":"Fangliang","suffix":""}],"badges":[],"createdAt":"2024-06-04 05:06:31","currentVersionCode":1,"declarations":"","doi":"10.21203/rs.3.rs-4525258/v1","doiUrl":"https://doi.org/10.21203/rs.3.rs-4525258/v1","draftVersion":[],"editorialEvents":[],"editorialNote":"","failedWorkflow":false,"files":[{"id":62837317,"identity":"f4e8a02f-b744-4b48-b829-9dbbf9fd4036","added_by":"auto","created_at":"2024-08-20 05:35:30","extension":"pdf","order_by":1,"title":"","display":"","copyAsset":false,"role":"manuscript-pdf","size":1096044,"visible":true,"origin":"","legend":"","description":"","filename":"manuscript.pdf","url":"https://assets-eu.researchsquare.com/files/rs-4525258/v1_covered_02cd72c2-9e8b-4fd2-88ad-3f4755f1a2ef.pdf"}],"financialInterests":"No competing interests reported.","formattedTitle":"Experimental Study on the Swelling Performance of Gaomiaozi Bentonite Buffer Material under Fe(II) Reducing Environment","fulltext":[],"fulltextSource":"","fullText":"","funders":[],"hasAdminPriorityOnWorkflow":false,"hasManuscriptDocX":false,"hasOptedInToPreprint":true,"hasPassedJournalQc":"","hasAnyPriority":false,"hideJournal":true,"highlight":"","institution":"","isAcceptedByJournal":false,"isAuthorSuppliedPdf":true,"isDeskRejected":"","isHiddenFromSearch":false,"isInQc":false,"isInWorkflow":false,"isPdf":true,"isPdfUpToDate":true,"isWithdrawnOrRetracted":false,"journal":{"display":true,"email":"[email protected]","identity":"researchsquare","isNatureJournal":false,"hasQc":true,"allowDirectSubmit":true,"externalIdentity":"","sideBox":"","snPcode":"","submissionUrl":"/submission","title":"Research Square","twitterHandle":"researchsquare","acdcEnabled":true,"dfaEnabled":false,"editorialSystem":"","reportingPortfolio":"","inReviewEnabled":false,"inReviewRevisionsEnabled":true},"keywords":"high-level radioactive waste repository; bentonite; Fe(II); swelling performance; mineral phase transformation","lastPublishedDoi":"10.21203/rs.3.rs-4525258/v1","lastPublishedDoiUrl":"https://doi.org/10.21203/rs.3.rs-4525258/v1","license":{"name":"CC BY 4.0","url":"https://creativecommons.org/licenses/by/4.0/"},"manuscriptAbstract":"The release of Fe(II) from iron-based disposal canisters during the operational period of high-level radioactive waste (HLW) repositories may affect the swelling behavior of the buffer barrier, consequently impacting repository safety and stability. 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