Bentonite has been considered as a potential buffer material in the engineering barriers of highlevel radioactive waste disposal systems. The intrusion of groundwater and heat from the waste change the temperature of the bentonite, which can alter the hydraulic properties of the bentonite. In this study, temperature effects on permeability were observed in two Ca-type bentonites. Laboratory tests were conducted on two types of block that were compacted using Korean Gyeongju bentonite and bentonil-WRK at different dry densities. Permeability tests were conducted at three different temperatures, namely 30°C, 60°C, and 90°C, using deionized water. Moreover, comparison between two Ca-type bentonites is carried out.

• Minseop Kim(Korea Atomic Energy Research Institute (KAERI)) Corresponding author
• Jin-seop Kim(Korea Atomic Energy Research Institute (KAERI))
• Seok Yoon(Korea Atomic Energy Research Institute (KAERI))
• Gi Jun Lee(Korea Atomic Energy Research Institute (KAERI))