Abstract
The compacted bentonite which has typical couple problem associated to thermal - hydration - mechanical – chemical (THMC) consist of one component of engineered barrier. Recently, the couple THMC formulation modelling suggested by some researchers can be predicted basically phenomena for engineered barrier that approach to correct evaluate satisfied facilities. The compacted bentonite is essentially unsaturated condition, some behaviors for bentonite has similar or close with generally expansive unsaturated soils. Therefore, hydrations have given significant influence on deformation of compacted bentonite such as swelling. There are many researches for swelling behavior of compacted bentonite within soaking. Extended theoretical or experimental investigations for unsaturated soil mechanics are possible to describe the strength-deformation behavior of compacted bentonite with suction controlling principle. A new method of determining the failure phase such as great axis deformation and destructions like strip of surface in the laboratory is described and the creep behavior of compacted bentonite is considered under maintain of high relative humidity environment. The creep deformation measured using improved cyclic relative humidity control apparatus in terms of specific suction control technique.
Highlights
Atomic power plant supply enough electrical power to industrial activity or human life that must be administrate under strict surveillance
This study investigated the creep test of compacted bentonite consisted of barrier system of high level radioactive waste disposal
The creep testing apparatus was modified, which applying of hydration was maintained at constant RH environment with air circulation
Summary
Atomic power plant supply enough electrical power to industrial activity or human life that must be administrate under strict surveillance. Geotechnical engineers have required to deal with accurate performance assessment of high level radioactive waste disposal, is related to effect of deformation due to placement heavy waste on the compacted bentonite as barrier system. In drained condition or undrained condition, volume changes response of clayey rock is known to sensitive to temperature elevation or decreasing of effective stress soil particle together with respect to overconsolidation ratio. Further factors such as gas migration, gas pressure, thermal heat and unsaturation-saturation couple properties have been focused on, and mathematical models imposed these parameters are processed. Creep behavior of kaolin and silt were measured to compare with compacted bentonite which were not expansive properties
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