典型文献
Swelling ability and behaviour of bentonite-based materials for deep repository engineered barrier systems:Influence of physical,chemical and thermal factors
文献摘要：
Compacted bentonite-sand(B/S)mixtures have been used as a barrier material in engineered barrier systems(EBSs)of deep geological repositories(DGR)to store nuclear wastes.This study investigates the individual and combined effects of different chemical compositions of deep groundwaters(chemical factor)at potential repository sites in Canada(the Trenton and Guelph regions in Ontario),heat gener-ated in DGRs(thermal factor),dry densities and mass ratios of bentonite and sand mixtures(physical factors)on the swelling behavior and ability of bentonite-based materials.In this study,swelling tests are conducted on B/S mixtures with different B/S mix ratios(20/80 to 70/30),compacted at different dry densities(ρd=1.6-2 g/cm3),saturated with different types of water(distilled water and simulated deep groundwater of Trenton and Guelph)and exposed to different temperatures(20℃-80℃).Moreover,scanning electron microscopy(SEM)analyses,mercury intrusion porosimetry(MIP)tests and X-ray diffractometry(XRD)analyses are carried out to evaluate the morphological,microstructural and mineralogical characteristics of the B/S mixtures.The test results indicate that the swelling potential of the B/S mixtures is significantly affected by these physical and chemical factors as well as the combined effects of the chemical and thermal factors.A significant decrease in the swelling capacity is observed when the B/S materials are exposed to the aforementioned groundwaters.A large decrease in the swelling capacity is observed for higher bentonite content in the mixtures.Moreover,higher tempera-tures intensify the chemically-induced reduction of the swelling capacity of the B/S barrier materials.This decrease in the swelling capacity is caused by the chemical and/or microstructural changes of the materials.The results from this research will help engineers to design and build EBSs for DGRs with similar groundwater and thermal conditions.
文献关键词：
中图分类号：
作者姓名：
Mohammed Alzamel;Mamadou Fall;Sada Haruna
作者机构：
Department of Civil Engineering,University of Ottawa,Ottawa,Ontario,K1N 6N5,Canada
文献出处：
引用格式：
[1]Mohammed Alzamel;Mamadou Fall;Sada Haruna-.Swelling ability and behaviour of bentonite-based materials for deep repository engineered barrier systems:Influence of physical,chemical and thermal factors)[J].岩石力学与岩土工程学报（英文版）,2022(03):689-702
A类：
Compacted,EBSs,repositories,groundwaters,Trenton,Guelph,DGRs
B类：
Swelling,ability,behaviour,bentonite,materials,deep,repository,engineered,barrier,systems,Influence,physical,thermal,factors,sand,mixtures,have,been,geological,store,nuclear,wastes,This,study,investigates,individual,combined,effects,different,compositions,potential,sites,Canada,regions,Ontario,heat,gener,dry,densities,mass,ratios,swelling,behavior,this,tests,are,conducted,compacted,cm3,saturated,types,distilled,simulated,exposed,temperatures,Moreover,scanning,electron,microscopy,analyses,mercury,intrusion,porosimetry,MIP,ray,diffractometry,carried,out,evaluate,morphological,microstructural,mineralogical,characteristics,results,indicate,that,significantly,affected,by,these,decrease,capacity,observed,when,aforementioned,large,higher,content,intensify,chemically,induced,reduction,caused,changes,from,research,will,help,engineers,design,build,similar,conditions
AB值：
0.399748
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