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Advances in Concrete Construction Volume 10, Number 1, July 2020 , pages 71-79 DOI: https://doi.org/10.12989/acc.2020.10.1.071 |
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Investigation of flexural behavior of a prestressed girder for bridges using nonproprietary UHPC |
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Hoa D. Pham, Tung Khuc, Tuan V. Nguyen, Hung V. Cu,
Danh B. Le and Thanh P. Trinh
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| Abstract | ||
| Ultra-high-performance concrete (UHPC) is recognized as a promising material in future civil engineering projects due to its outstanding mechanical and durability properties. However, the lack of local UHPC materials and official standards, especially for prestressed UHPC structures, has limited the application of UHPC. In this research, a large-scale prestressed bridge girder composed of nonproprietary UHPC is produced and investigated. This work has two objectives to develop the mixing procedure required to create UHPC in large batches and to study the flexural behavior of the prestressed girder. The results demonstrate that a sizeable batch of UHPC can be produced by using a conventional concrete mixing system at any precast factory. In addition, incorporating local aggregates and using conventional mixing systems enables regional widespread use. The flexural behavior of a girder made by this UHPC is investigated including flexural strength, cracking pattern and development, load-deflection curve, and strain and neutral axis behaviors through a comprehensive bending test. The experimental data is similar to the theoretical results from analytical methods based on several standards and recommendations of UHPC design. | ||
| Key Words | ||
| local UHPC; prestressed girder; flexural behavior; large-scale testing; bridge | ||
| Address | ||
| Hoa D. Pham, Tung Khuc, Hung V. Cu, Danh B. Le and Thanh P. Trinh: Department of Bridges and Highways Engineering, National University of Civil Engineering, Vietnam Tuan V. Nguyen: Department of Building Materials, National University of Civil Engineering 55 Giai Phong road, Hai Ba Trung district, Hanoi, Vietnam | ||
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