The Effect of Fiber Length and Specimen Size on Spalling and Temperature Distribution in High Strength Concrete Specimen

고강도 콘크리트 부재에서 섬유 길이와 부재 크기가 폭렬 특성 및 온도 분포에 미치는 영향

Recently, in order to reduce the spalling of high strength concrete under fire, the addition of organic fibres to high strength concrete has been investigated. In this study, the effect of fiber length and specimen size on the spalling and temperature distribution in high strength concrete specimen was experimentally investigated. Three HSC specimens measuring $305{\times}305mm$, $500{\times}500mm$ and $700{\times}700mm$ with the fiber were prepared. The fiber length was 6mm and 10mm. As a result, it appears that when the remaining ratios(by weight) of fibre at $300^{\circ}C$ and $350^{\circ}C$ are less than 80% and 50%, respectively, the spalling of high strength concrete is prevented.