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Engineering properties of GMZ bentonite-sand as buffer/backfilling material for high-level waste disposal / Ming Zhang in European journal of environmental and civil engineering, Vol. 16 N° 10 (Novembre 2012) 

Public ISBD [article]  in European journal of environmental and civil engineering > Vol. 16 N° 10 (Novembre 2012) . - pp. 1216-1237 Titre : Engineering properties of GMZ bentonite-sand as buffer/backfilling material for high-level waste disposal Type de document : texte imprimé Auteurs : Ming Zhang, Auteur ; Huyuan Zhang, Auteur ; Suli Cui, Auteur Année de publication : 2012 Article en page(s) : pp. 1216-1237 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : High-level  waste  disposal  Buffer/backfilling  material  Bentonite-sand  mixtures  Engineering  property  Proportioning  design Résumé : This paper reports on the engineering properties of various mixtures of GMZ bentonite and sand, as regards their effectiveness as buffer/backfilling material. The sand ratio in the various test specimens was 0, 20, 30, 40 and 50%. Compaction tests were conducted to determine the optimum water content and maximum dry density of the bentonite-sand mixtures. A series of hydraulic and mechanical tests was conducted to assess Atterberg limits, the soil water characteristic curve, hydraulic conductivity, shear strength, swelling pressure and swelling strain of the bentonite-sand mixtures. The hydraulic conductivities of the mixtures, that had sand ratio varying from 0 to 30%, remained consistent and were low enough to prevent the flow of groundwater through the vitrified waste. The water holding capacity, shear strength and swelling capacity decreased slightly, but that could be partly offset by increasing the effective dry density and average dry density of the buffer/backfilling material. The Atterberg limits decreased by mixing in additional sand, which could offer improved the workability of buffer/backfilling material. It was suggested that the most effective sand ratio of GMZ bentonite-sand mixtures, which are available in China, should not be more than 30%. ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/full/10.1080/19648189.2012.690934 [article] Engineering properties of GMZ bentonite-sand as buffer/backfilling material for high-level waste disposal [texte imprimé] / Ming Zhang, Auteur ; Huyuan Zhang, Auteur ; Suli Cui, Auteur . - 2012 . - pp. 1216-1237. Génie Civil Langues : Anglais (eng) in European journal of environmental and civil engineering > Vol. 16 N° 10 (Novembre 2012) . - pp. 1216-1237 Mots-clés : High-level  waste  disposal  Buffer/backfilling  material  Bentonite-sand  mixtures  Engineering  property  Proportioning  design Résumé : This paper reports on the engineering properties of various mixtures of GMZ bentonite and sand, as regards their effectiveness as buffer/backfilling material. The sand ratio in the various test specimens was 0, 20, 30, 40 and 50%. Compaction tests were conducted to determine the optimum water content and maximum dry density of the bentonite-sand mixtures. A series of hydraulic and mechanical tests was conducted to assess Atterberg limits, the soil water characteristic curve, hydraulic conductivity, shear strength, swelling pressure and swelling strain of the bentonite-sand mixtures. The hydraulic conductivities of the mixtures, that had sand ratio varying from 0 to 30%, remained consistent and were low enough to prevent the flow of groundwater through the vitrified waste. The water holding capacity, shear strength and swelling capacity decreased slightly, but that could be partly offset by increasing the effective dry density and average dry density of the buffer/backfilling material. The Atterberg limits decreased by mixing in additional sand, which could offer improved the workability of buffer/backfilling material. It was suggested that the most effective sand ratio of GMZ bentonite-sand mixtures, which are available in China, should not be more than 30%. ISSN : 1964-8189 En ligne : http://www.tandfonline.com/doi/full/10.1080/19648189.2012.690934