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Open AccessArticle

An Experimental Study on the Ductility and Flexural Toughness of Ultrahigh-Performance Concrete Beams Subjected to Bending

1
Department of Civil Engineering, Kunsan National University, Kunsan, Jeonbuk 54150, Korea
2
Structural Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology, Goyang, Gyeonggi 10223, Korea
3
Department of Environmental Management Business, EPS Engineering, Anyang, Gyeonggi 13930, Korea
*
Author to whom correspondence should be addressed.
Materials 2020, 13(10), 2225; https://doi.org/10.3390/ma13102225
Received: 16 March 2020 / Revised: 6 May 2020 / Accepted: 8 May 2020 / Published: 12 May 2020
(This article belongs to the Special Issue Advanced Fiber-Reinforced Concrete Composites)
Ultrahigh-performance concrete (UHPC) and high-strength concrete (HSC) are currently widely used because of their distinct superior properties. Thus, a comprehensive comparison of the flexural behavior of UHPC and HSC beams is presented in this study. Nine UHPC beams and three HSC beams were subjected to pure bending tests to investigate the effect of various reinforcement ratios and steel fiber volume contents on the cracking and failure patterns, load-deflection behavior, ductility, and flexural toughness of these beams. The addition of steel fibers in the UHPC improved the energy absorption capacity of the beams, causing the UHPC beams to fail via rebar fracture. The deflection and curvature ductility indices were determined and compared in this study. The ductility indices of the HSC beam tended to decrease sharply as the rebar ratio increased, whereas those of the UHPC beam did not show a clear trend with respect to the rebar ratio. In addition, a comparison between the results in this study and the results from previous studies was performed. In this study, the addition of steel fiber contents up to 1.5% in UHPC increased the load capacity, ductility, and flexural toughness of the UHPC beams, whereas the addition of a steel fiber content of 2.0% did not significantly increase the ductility or flexural toughness of the UHPC beams. View Full-Text
Keywords: ultrahigh-performance concrete (UHPC); high-strength concrete (HSC); flexural behavior; steel fiber; ductility; flexural toughness ultrahigh-performance concrete (UHPC); high-strength concrete (HSC); flexural behavior; steel fiber; ductility; flexural toughness
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Yang, I.-H.; Park, J.; Bui, T.Q.; Kim, K.-C.; Joh, C.; Lee, H. An Experimental Study on the Ductility and Flexural Toughness of Ultrahigh-Performance Concrete Beams Subjected to Bending. Materials 2020, 13, 2225.

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