Thermodynamic Response of Crystalline Swelling and Double-Layer Swelling of Compacted Bentonite

Conference paper

Abstract

Strong thermodynamic disequilibrium existed in HLW repository site often deteriorates the hydration swelling capacity of compacted bentonite, including the crystalline swelling and the double-layer swelling. In order to investigate the temperature effect on the crystalline swelling capacity and the double-layer swelling capacity, four swelling pressure tests and four swelling strain tests were conducted on compacted Gaomiaozi (GMZ) bentonite specimens saturated with de-ionized water under the temperature of 20 °C to 80 °C. Main observations show that the crystalline swelling capacity and the double-layer swelling capacity generally decrease with the temperature increases; whereas the crystalline swelling pressure and the double-layer swelling strain present a slight increase tendency under higher temperatures, especially the temperature 60 °C and 80 °C.

Keywords

Compacted bentonite Crystalline swelling Double-layer swelling Swelling pressure Swelling strain 

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Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  1. 1.Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Department of Geotechnical EngineeringTongji UniversityShanghaiPeople’s Republic of China

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