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Title |
Spalling Properties of the High Strength Concrete Containing PP Fiber Subjected to Fire Mixture Factors and Drying Condition
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Keywords |
공기량 ; 건조상태 ; 고강도 콘크리트 ; 폭렬 ; 물-결합재비 Air content ; Drying states ; High performance concrete ; Spalling ; Water-binder ratio |
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Abstract |
This paper is to investigate the affecting factors on spalling of the high strength concrete including W/B, air content and moisture condition as well as PP fiber contents subjected to fire. An increase with 0.05% of PP fiber resulted in a reduction of slump flow by as much as 11%. Ten percent of air contents due to excessive amounts of AE agent does not lead to variance of slump flow, regardless of PP fiber content. For the effect of the compressive strength, high strength concrete with 15, 25 and 35% of W/B gained 60 ㎫~100 ㎫ of the compressive strength. High strength concrete with H-air had half of compressive strength of that with L-air due to large amount of air. Fire test was conducted in accordance with KS F 2257-1 for 1 hour. Spalling did not occur with all specimens containing more than 0.10% of PP fiber except those with 15% of W/B. Moreover, it is interesting to note that the specimens with more than 10% of air content and with oven dried condition, respectively, had no spalling even if the content of PP fiber is 0.05 vol.%.
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