Abstract
This study presented the overview on the behavior of bentonite-sand mixture used in high level radioactive waste disposal. Both unconfined compression test and triaxial compression test were conducted out that unsaturated-saturated bentonite-sand samples were applied temperature effect below 100 degrees Celsius. Unconfined compressive strength was determined with various temperatures and different relative humidity for unsaturated bentonite-sand specimens, so the growing of pore pressure due to heating was most significant for interpretation to THM behaviour of artificial barrier system compositing bentonite materials.
Highlights
Compacted bentonite with high swelling performance is included in buffer and backfill materials in high-level radioactive waste (HLW)
This study presented the overview on the behavior of bentonite-sand mixture used in high level radioactive waste disposal
Using the developed steel mold installed the two pressure sensors, determination of pore pressures was conducted at high temperature, which heating was supplied within isotropic direction
Summary
Compacted bentonite with high swelling performance is included in buffer and backfill materials in high-level radioactive waste (HLW). The influence of high temperature on bentonite properties is one of significant targets on thermos-hydro-mechanical (THM) evolution in the swelling material barrier, should be investigated adequate. The bentonite with sand barrier, initially, under unsaturated condition is subjected to some thermal, hydraulic gradients and high external loading, because of its expansive performance is expected to swell close to the host rock as result of the water inflow (Akesson et al, (2009) [3]). This study presented the overview on the behavior of bentonite-sand mixture used in high level radioactive waste disposal. Both unconfined compression test and triaxial compression test were conducted out that unsaturated-saturated bentonite-sand samples were applied temperature below 100 degrees Celsius. The parameters such as stiffness, apparent cohesion and angle of internal friction were measured for safety design specification
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