| 요약2 |
This study investigates the fundamental properties and examines the spalling appearances and residual compressive strength after fire test of high strength concrete depending on polymer contents and appearance. The results are summarized as following. For the flowability, the slump flows of EVA-P(Powder type Ethylene Vinyl Acetate Copolymer), PVA-F(Fiber type Polyvinyl Alcohol Copolymer), and PP-F(Fiber type Polypropylene) were slightly decreased caused by polymer contents. However, the slump flow of PVA-P appeared greatly decreasing tendency due to increased viscosity. The air contents of EVA-P, PVA-F, and PP-F were satisfied target air content, but the case of PVA-P was greatly increased over 0.1% of polymer content. The strength of 10% of EVA-P and others were slightly declined, but the strength of PVA-P was greatly decreased about 20% caused by increasing air content. The spalling appeared on EVA-P, PVA-P, PVA-F, and control concrete. However, when 0.10% of PP-F was mixed, spalling can be prevented effectively therefore PP-F with 0.10% was confirmed as favorable shape and content. After fire test, the residual compressive strength was greatly decreased because of the inner crack, and it declined about 20～30% when the spalling did not occur. |