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Title |
A Study on the Highest Exposure Temperatures of Exposed Reinforced Concrete Structures at Fire
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Keywords |
시차열분석 ; X-선 회절 ; 주사형 전자현미경 ; 최고노출온도예측 ; 화재손상분석 Differential thermal analysis ; X-ray diffraction ; Scanning electron microscope ; Predict highest exposure temperature ; Fire damage analysis |
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Abstract |
In this paper, Machinery analysis was conducted, in order to predict highest exposure temperatures and the analyze fire damage in the case of fire on reinforced concrete structure. After analyzing differential thermal of reference materials in accordance with temperature of concrete reference core specimen, it turned out that powerful endothermic peak came resulting from evaporation of capillary water and get water untill 200℃, another endothermic peak came resulting from decomposition of calcium hydroxide at 520℃, and then mass of reference materials remarkably decreased due to endothermic reaction. Another powerful endothermic reaction came after decomposition of calcite at 720℃. After analyzing X-ray diffraction of reference materials in accordance with temperature of concrete reference core specimen, it turned out that calcium hydroxide existed until the temperature of 400℃, but CH almost disappeared and CaO appeared from 600℃. The production increased in proportion to the temperature. This is because that calcium hydroxide and calcite are decomposed and CaO is produced when the temperature of concrete increases with fire. It is estimated that calcium hydroxide and calcite are utterly decomposed and peak disappears, and peak of CaO is remarkably formed instead, at the temperature of 700-800℃.
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