Tunnel fires have significant social and economic impacts, causing extensive damage to concrete and steel reinforcements at high temperatures. Despite international advancements in fire-resistant designs, the safety measures for tunnel fires in South Korea remain insufficient. This study aimed to evaluate the fire resistance of fiber-reinforced concrete incorporating fire-resistant fibers with a focus on preventing spalling and enhancing structural safety. These findings are expected to contribute to the development of fire-resistant tunnel-design standards. Concrete mixtures with compressive strengths of 27 MPa were prepared according to highway construction material standards. Fiberreinforced concrete samples were produced with fire-resistant fiber dosages of 0.0, 0.6, 0.8, and 1.0 kg per cubic meter. Fresh concrete tests, including air content (KS F 2421) and slump (KS F 2402) tests, were conducted along with compressive strength tests (KS F 2405) on the hardened concrete. The fire resistance was assessed using an electric furnace to simulate the fire curve conditions specified in the Road Tunnel Fire Safety Guidelines based on KS F 2257. Increasing the fiber content led to a slight reduction in slump, likely owing to fiber agglomeration, with minimal effect on workability within the tested range. The air content exhibited negligible variation, indicating that there was no major impact on the air-void system. The compressive strength before the fire resistance test fluctuated but consistently met the design target of 27 MPa. The compressive strength after the fire resistance test across all samples decreased to approximately 2.0 MPa. The fiber-reinforced concrete exhibited reduced internal temperatures compared to the control, which was attributed to heat transfer disruption and the formation of micropores by the fibers. In this study, fiber-reinforced concrete demonstrated improved thermal resistance under fire conditions with minimal impact on the workability and air content within the tested range. Although the compressive strength before the fire resistance test remained adequate, the sharp decline in the post-fire strength highlights the need for further optimization. These findings emphasize the potential of fiber-reinforced concrete as a cost-effective solution for enhancing tunnel fire resistance, thereby supporting the development of safer and more resilient infrastructures.

최근 들어 아라미드 섬유 시트는 건설 산업에 쉽게 사용되고 있다. 아라미드 섬유 시트는 높은 특성강도 및 강성, 높은 부식 저항성능, 경량 및 자기적 투명성과 같은 많은 장점을 제공한다. 본 연구에서는 아라미드 섬유 시트의 난연성능 및 접착강도가 연구되었다. 아라미드 섬유 보강 콘크리트 기둥의 내화성능은 표준 및 외부화재 곡선에 대해 서로 다른 조합의 보드 두께와 종류로 제작된 6개의 실험체를 사용하여 연구되었다. 그 결과 아라미드 섬유 시트는 마감재료를 이용해서 한 시간의 내화성능을 가지는 것으로 나타났다.