시간가열온도곡선에 따른 터널라이닝 콘크리트의 내화성능 평가

Evaluation of Fire-Resistant Performance for Tunnel Lining Concrete with Heating Temperature-Time Curves

In this study, evaluation of fire-resistant performance for polypropylene fiber-mixed mortar was performed to establish specification for stability of tunnel structure against fire afterward. In the fire-resistant performance test with mix proportion of polypropylene fiber, cracks were observed for mortar under 0.15% of fiber content, but micro-cracks were remarkably reduced for mortar more than 0.2% of fiber content. From the results, we are concluded that optimal mix proportion of polypropylene fiber is $0.20{\sim}0.25%$.