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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Changing of Properties of Unsaturated Compacted Bentonite due to Hydration Effort
Author(s)
Tomoyoshi Nishimura1 and Junichi Koseki2
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DOI:10.17265/2162-5263/2018.03.002
Affiliation(s)
1. Department of Civil Engineering, Ashikaga University, Ashikaga, Tochigi 326 8558, Japan
2. Department of Civil Engineering, The University of Tokyo, Bunkyo-ku, Tokyo 113 8654, Japan
ABSTRACT
Radioactive waste disposal
is important facility for human and environment in the world. Compacted
bentonite in radioactive disposal engineer barrier design really experience
hydration effort as decreasing of suction during long-time. Hydration effort
develop macro-micro void structure in bentonite under deeply geological
environment. The bentonite occurred uncertainly problems or translation in
various experimental interaction boundary conditions such as
thermal-hydration-chemical condition. To detect accumulation of deformation or
changing of bentonite behaviour due to these processes is important that the
modified experimental methods are required. In addition, to interpret
laboratory experimental results combine to establish mathematical modelling in
possible. The overall investigation or performance of the bentonite have
contributed to represent the intrinsic properties of engineer barrier systems. This
study focused on changing of properties of unsaturated compacted bentonite
related to hydration effort due to increasing of relative humidity. Changing of
some properties revealed to become instability or uncertainly problems in
practice. Soil-water characteristic curve was measured with considering of
various temperatures using vapor pressure technique. Swelling pressure and
creep behaviour such as mechanical components were described with hydration
effort.
KEYWORDS
Bentonite, suction, soil-water characteristic curve, swelling pressure, creep deformation.
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