{"title":"Effect of alkaline solution on hydraulic and mechanical properties of MX80 granular bentonite","authors":"","doi":"10.1016/j.anucene.2024.110822","DOIUrl":null,"url":null,"abstract":"<div><p>Granular bentonite is commonly regarded as a preferred anti-seepage and plugging material for the joints in high-level radioactive waste (HLW) repository. This study investigated the swelling, compression, rebound and permeability properties of MX80 granular bentonite with alkaline solution (0–1.0 mol/L). Results showed that compared with the alkaline concentration, the final swelling strain, compression and rebound indexes were negligibly affected by the particle size distribution. The preconsolidation pressure and hydraulic conductivity increased with increasing the concentration. When concentration <em>c</em> < 0.3 mol/L, the hydraulic conductivity was less affected by alkaline solution. When <em>c ></em> 0.3 mol/L, large aggregates were dissolved and resulted in a higher hydraulic conductivity. Results of scanning electron microscope (SEM) and processed images showed that the complexity, roughness and the size of the pores increased as the concentration increased. The dissolution of montmorillonite affected the pore size distribution and the hydraulic and mechanical properties of granular bentonite.</p></div>","PeriodicalId":8006,"journal":{"name":"Annals of Nuclear Energy","volume":null,"pages":null},"PeriodicalIF":1.9000,"publicationDate":"2024-08-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Annals of Nuclear Energy","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0306454924004857","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"NUCLEAR SCIENCE & TECHNOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
Granular bentonite is commonly regarded as a preferred anti-seepage and plugging material for the joints in high-level radioactive waste (HLW) repository. This study investigated the swelling, compression, rebound and permeability properties of MX80 granular bentonite with alkaline solution (0–1.0 mol/L). Results showed that compared with the alkaline concentration, the final swelling strain, compression and rebound indexes were negligibly affected by the particle size distribution. The preconsolidation pressure and hydraulic conductivity increased with increasing the concentration. When concentration c < 0.3 mol/L, the hydraulic conductivity was less affected by alkaline solution. When c > 0.3 mol/L, large aggregates were dissolved and resulted in a higher hydraulic conductivity. Results of scanning electron microscope (SEM) and processed images showed that the complexity, roughness and the size of the pores increased as the concentration increased. The dissolution of montmorillonite affected the pore size distribution and the hydraulic and mechanical properties of granular bentonite.
期刊介绍:
Annals of Nuclear Energy provides an international medium for the communication of original research, ideas and developments in all areas of the field of nuclear energy science and technology. Its scope embraces nuclear fuel reserves, fuel cycles and cost, materials, processing, system and component technology (fission only), design and optimization, direct conversion of nuclear energy sources, environmental control, reactor physics, heat transfer and fluid dynamics, structural analysis, fuel management, future developments, nuclear fuel and safety, nuclear aerosol, neutron physics, computer technology (both software and hardware), risk assessment, radioactive waste disposal and reactor thermal hydraulics. Papers submitted to Annals need to demonstrate a clear link to nuclear power generation/nuclear engineering. Papers which deal with pure nuclear physics, pure health physics, imaging, or attenuation and shielding properties of concretes and various geological materials are not within the scope of the journal. Also, papers that deal with policy or economics are not within the scope of the journal.