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Title |
Evaluation on Mechanical Properties of High Strength Light-Weight Concrete with Elevated Temperature and loading
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Authors |
김규용 ; 김영선 ; 최경철 ; 박현길 ; 이태규 |
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Keywords |
고온조건 ; 하중조건 ; 일반 골재 ; 경량 골재 ; 역학적 특성 high temperature ; loading condition ; normal weight aggregate ; light weight aggregate ; mechanical properties |
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Abstract |
It is very important to experimentally evaluate concrete behavior at elevated temperature because aggregates make up approximately 80 percent of volume in concrete. In this study, an experiment to evaluate mechanical properties of normal weight and light weight concrete of 60 MPa was conducted. Based on loading level of 0, 20 and 40 percent, the tests of 28 days compressive strength, elastic modulus, thermal strain, total strain, and transient creep using Ø100 × 200 mm cylindrical specimens at elevated temperature were performed. Then, the results were compared with CEB (Committes Euro-international du Beton) model code. The results showed that thermal strain of light weight concrete was smaller than normal weight concrete. Also, the results showed that compressive strength of light concrete at 700oC was higher than normal weight concrete and CEB code, similar to that obtained at ambient temperature. Transient creep developed from loading at a critical temperature of 500oC caused the concrete strains to change from expansion to compression. The transient creep test result showed that internal force was high when the ratio of shrinkage between concrete and aggregate was more influential than thermal expansion.
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