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영어

with different lengths and different adding ratios, and investigates spalling resistance and residual compressive strength after fire test. Test results should that increase of fiber adding ratio decreased the fluidity of fresh concrete, especially specimens using 19mm of PP fiber and containing combination of simultaneous 12mm and 19mm (Pmxl). For the air content of concrete, all specimens used in this study satisfied the target value. In addition, after fire test, control concrete without fiber exhibited severe spalling, due to abrupt high temperature and vapor pressure of the inside of concrete. However, specimens containing more than of PP fiber and 0.15% of (Psxl) and (Psxl), which is the combinations of 6mm and 19mm as well as 12mm and 19mm of PP fiber respectively. For the residual compressive strength of specimens after fire test completed, even specimens that spalling was not found exhibited 20~50% value, due to the crack occurrence of concrete at elevated temperature.