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Title |
Models for Hydration Heat Development and Mechanical Properties of Ultra High Performance Concrete
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Authors |
차수원 ; 김기현 ; 김성욱 ; 박정준 ; 배성근 |
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Keywords |
초고성능 콘크리트 ; 수화열 ; 단열온도 상승곡선 ; 등가재령 UHPC ; heat of hydration heat ; adiabatic temperature rise curve ; equivalent time |
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Abstract |
Concrete has excellent mechanical properties, high durability, and economical advantages over other construction materials. Nevertheless, it is not an easy task to apply concrete to long span bridges. That's because concrete has a low strength to weight ratio. Ultra high performance concrete (UHPC) has a very high strength and hence it allows use of relatively small section for the same design load. Thus UHPC is a promising material to be utilized in the construction of long span bridges. However, there is a possibility of crack generation during the curing process due to the high binder ratio of UHPC and a consequent large amount of hydration heat. In this study, adiabatic temperature rise and mechanical properties were modeled for the stress analysis due to hydration heat. Adiabatic temperature rise curve of UHPC was modeled superposing 2-parameter model and S-shaped function, and the Arrhenius constant was determined using the concept of equivalent time. The results are verified by the mock-up test measuring the temperature development due to the hydration of UHPC. In addition, models for mechanical properties such as elastic modulus, tensile strength and compressive strength were developed based on the test results from conventional load test and ultrasonic pulse velocity measurement.
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