Gas threshold pressure and gas permeability of silo concrete specimens for a low- and intermediate-level waste disposal facility in Korea

► We measured gas threshold pressure and gas permeability of the silo concrete in Korean LILW disposal facility. ► The gas threshold pressure was obtained in the range of 30-40 bar. ► The gas permeability was measured as the range of 10−17-10−18 m2. ► The standard deviations of the results were significantly large because of the characteristics of porous medium.