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Öğe Thermal impacts on the erosion of compacted bentonite under flow rate(Springernature, 2024) Bülbül, Süleyman; Sedighi, Majid; Sevim, ÖzerCompacted bentonite is widely used as a filling and barrier material for underground storage of spent nuclear fuel waste due to its favorable properties. Over its design life, this compacted clay may be exposed to groundwater from the surrounding host rock. Depending on the modeling approaches and assumptions, the temperature to which the compacted bentonite will be exposed can vary. This paper presents the findings of laboratory investigations on the erosion of compacted bentonite at ambient temperature (26 degrees C) and elevated temperature (80 degrees C) temperatures. The compacted bentonite samples, with dry densities of 1.72 g/cm3 and 1.73 g/cm3 were subjected to erosion under a flow rate of 0.22 ml/min at 26 degrees C and 80 degrees C, respectively. The dynamic light scattering (DLS) method was employed to measure the size and quantity of the eroded particles. The amount of daily erosion and the size of the eroded particles were determined from effluent samples. The results indicate that the amount of eroded bentonite particles increased significantly with increasing temperature. Additionally, as temperature increased, the size of bentonite particles in the effluent decreased within a specific range. At 26 degrees C, particle sizes ranged from 59 to 6358 nm, whereas at 80 degrees C, the particle size distribution narrowed.Öğe Investigation of Hydraulic Effect in Terms of Colloid Formation from Compacted Bentonite(2024) Bülbül, SüleymanA series of experiments were conducted an investigation into the amount of erosion, size of eroded particles, and swelling area of physically purified and compacted bentonite under different flow rates. Dynamic light scattering method(DLS) was used to determine the size and amount of eroded particles and Autocad programme was used to determine the swelling area.Where compacted bentonite and crushed granite come into contact, groundwater plays an important role in the erosion of bentonite.Contact of compacted bentonite with water, its saturation with water and its subsequent swelling and entry into the voids around it are the primary steps for the formation of colloid particles. Factors affecting the erosion of compacted bentonite are groundwater flow rate, ionic strength of the water contacting the bentonite, pH of the water, etc. The groundwater to which the compacted bentonite buffer will be exposed during the designed service life of the compacted bentonite buffer reduces the robustness of the bentonite buffer.Erosion of compacted bentonite not only affects its physical stability but also causes the transport of radionuclides it absorbs.An experimental methodology is presented. The experimental results showed that with increasing flow rate the amount of eroded bentonite increases and the swelling area increases. No correlation was found between the flow rate and the size of the eroded particles.
