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Title |
Performance Evaluation of High Strength Concrete with Composite Fibers in Accordance with High Temperature
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Authors |
김승기(Seung-Ki Kim) ; 김우석(Woo-Suk Kim) |
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DOI |
http://dx.doi.org/10.11112/jksmi.2015.19.6.063 |
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Keywords |
고강도 콘크리트 ; XRD ; SEM 분석 ; 복합섬유 ; 폭렬 ; 고온 High strength concrete ; XRD ; SEM analysis ; Composite fiber ; Spalling ; Elevated temperature |
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Abstract |
The objective of the present study is to investigate how elevated temperature ranging from 100°C to 800°C as well as room temperature affects the variation of mechanical properties of high strength concrete (over fck = 60 MPa grade). In this experiment, specimens were exposed for a period of 2°C/min to temperatures of 20℃, 100°C, 200°C, 300°C 400°C, 500°C, 600°C, 700°C and 800°C, respectively. Accordingly, the study investigated the fire resistance performance of high strength concrete mixed with composite fibers which composed with hybrid fibers and steel fibers. After cooling down to ambient temperature, the following basic mechanical properties were then evaluated and compared with reference values obtained prior to thermal exposure: (i) compressive strength in room temperature; (ii) residual compressive strength; (iii) Poisson's ratio; (iv) weight change; (v) SEM analysis & XRD analysis In addition, XRD and SEM Images analyses were performed to investigate chemical and physical characteristics of high strength concrete with composite fibers according to high temperature
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