The water vapor pressure property of 150MPa level ultra high strength concrete reinforced with polypropylene fiber and amorphous steel fiber at high temperature

고온에서 폴리프로필렌섬유와 비정질강섬유를 보강한 150MPa급 초고강도 콘크리트의 수증기 압력특성

The aim of this study is to evaluate the combination effect of amorphous steel fiber and polypropylene fiber on spalling of the 150MPa level ultra high strength concrete. Considering spalling has a great relationship with water vapor pressure, this paper is focusing on water vapor pressure. The test specimens were heated accordance with ISO-834 Standard Curve using electric heating furnace, the depth of 10mm water vapor pressure formation was tend to get faster and spalling damage become severe when the mixing proportion of amorphous steel fiber increase. When using ultra high strength concrete reinforced with amorphous steel fiber, further research about proper mixing proportion of polypropylene fiber.