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PP 섬유를 함유한 고강도 철근콘크리트 기둥의 폭열 특성에 관한 실험적 연구
강신준 ( Kang Shin-june ),신성우 ( Shin Sung-woo ),이광수 ( Lee Kwang Su ),안종문 ( An Jong Mun ),유석형 ( Yoo Suck Hyung ) 한국구조물진단유지관리공학회 2004 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.8 No.2
A spalling is defined as the damages of concrete exposed to high temperature during the fire by causing cracks and localized bursting of small pieces of concrete. It is reported that spalling is caused by the vapor pressure and polypropylene(PP) fiber has an important role in protecting from spalling. The properties of fire resistance of high-strength reinforced concrete columns under various concrete strength and various contents of PP fiber were investigated in this study. Inner temperature was measured by three thermocouples located in specimens. For one hour heating the temperature of thermocouple at 25mm was rapidly raised because of covering exfoliation by spalling. After one hour heating Spalling occured in specimens contained PP fiber of 0% and 0.1, but it didn’t occur in specimen contained PP fiber of 0.2%. As a residual strength test result, the loss of axial load decreases as the amount of PP fiber increases.
PP 섬유를 함유한 고강도 철근콘크리트 기둥의 폭열 특성에 관한 실험적 연구
강신준(Kang Shin-June),신성우(Shin Sung-Woo),이광수(Lee Kwang Su),안종문(An Jong Mun),유석형(Yoo Suck Hyung) 한국구조물진단유지관리학회 2004 한국구조물진단학회 학술발표회논문집 Vol.- No.-
A spalling is defined as the damages of concrete exposed to high temperature during the fire by causing cracks and localized bursting of small pieces of concrete. It is reported that spalling is caused by the vapor pressure and polypropylene(PP) fiber has an important role in protecting from spalling The properties of fire resistance of high-strength reinforced concrete columns under various concrete strength and various contents of PP fiber were investigated in this study Inner temperature was measured by three thermocouples located In specimens For one hour heating the temperature of thermocouple at 25mm was rapidly raised because of covering exfoliation by spalling. After one hour heating Spalling occured in specimens contained PP fiber of 0% and 01, but it didn't occur in specimen contained PP fiber of 0.2%. As a residual strength test result the loss of axial load decreases as the amount of PP fiber Increases.