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초고강도 내화 콘크리트의 현장 적용을 위한 내화성능 평가에 관한 연구
백영운 ( Baek Young-woon ),육태원 ( Yuk Tae-won ),박동수 ( Park Dong-soo ),김한솔 ( Kim Han-sol ),이한승 ( Lee Hang-seung ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.2
The physical performance of high-strength concrete deteriorates when exposed to high temperatures such as fire. In particular, in the case of ultra-high-strength concrete, there is a high possibility of explosion due to internal water pressure and thermal expansion due to the tight internal structure. In this paper, a fire resistance certification test was conducted for field application of ultra-high-strength fire-resistant concrete, and the fire resistance performance (temperature rise of main rebar) was compared according to the structural concrete cover thickness. As a result, when the covering thickness was 40 mm, three structures did not meet the certification standards, and when the covering thickness was 50 mm, all structures met the fire resistance certification standards
고강도 내화 콘크리트의 강도 영역에 따른 현장 적용성 평가에 관한 연구
장종민 ( Jang Jong-min ),백영운 ( Baek Young-un ),육태원 ( Yuk Tae-won ),박동수 ( Park Dong-soo ),이한승 ( Lee Hang-seung ) 한국건축시공학회 2023 한국건축시공학회 학술발표대회 논문집 Vol.23 No.1
In this study, the mass production process was simulated using a 1㎥ batcher plant to evaluate the application of high-strength fire resistance concrete. The strength ranges of concrete were set to 50, 60, 70, and 80 MPa, and each concrete mix proportions was selected through preliminary experiments in the laboratory. For the selected concrete mix proportions, after the mixer load value was stabilized in the batcher plant, the slump flow and air content of the fresh concrete were evaluated, and the compressive strength was evaluated up to 56 days. As a result of the experiment, both the slump flow and air content of the fresh concrete satisfied the target performance, and in the case of compressive strength, 50 and 60 MPa satisfied the target performance at 28 days and 70 and 80 MPa at 56 days.