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Title |
Fire Resistance Performance of High Strength Concrete Columns with Fireproof Gypsum Board
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Keywords |
방화석고보드 ; 폭렬 ; 내화성능 ; 시공방법 ; 유리섬유종이 fire-resistant gypsum board ; explosive spalling ; fire resistance performance ; fastening method ; glass fiber tissue |
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Abstract |
In this study, fire resistance performance of high strength concrete specimen with fireproof gypsum board was investigated for possible use in upgrading fire-resistant performance of the existing building and repair of fire damaged structures. Fire test of eight identical high strength concrete columns were carried out for 180 minutes in accordance with ISO-834. The temperature distributions in longitudinal reinforcement and concrete temperature at various depths were recorded. The fireproof performance of gypsum board and explosive spalling of concrete were observed. The specimens with 15 mm thick twoply fireproof gypsum board spalled after gypsum board crumbled regardless of fastening methods. However, when the thickness of fireproof gypsum board was more than 30 mm, it was possible to prevent the explosive spalling and control the rebar temperature . Although the effect of cover thickness could not be compared because the explosive spalling occurred, there seemed to be no difference in insulation efficiency.
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