폴리프로필렌 섬유의 형상 및 혼입률에 따른 섬유보강 콘크리트의 온도별 기계적 성능 평가

초록

This study examined the fire resistance performance of normal-strength concrete mixed with polypropylene (PP) fibers. While previous research has focused mainly on high-strength concrete and micro fibers, this study explored how fiber shape and volume fraction can affect the residual properties after fire exposure. Test results showed that fiber inclusion contributed to the improvement of mechanical strength at room temperature, and macro fibers were generally more effective than micro fibers. However, after thermal exposure, all specimens showed reduced mechanical properties and similar deflection behavior regardless of fiber content. Compared to 94 test results reported in previous studies—primarily focused on high-strength concrete—the specimens in this study exhibited lower residual compressive strength. This difference can be attributed to the increased porosity and more severe decomposition of hydrates in normal-strength concrete after exposure to elevated temperatures, highlighting the need for refined prediction models tailored to this material.

키워드