Experimental study and theoretical analysis on the flexural behaviors of UHPC-strengthened NC overlay in bridge deck
Ultra-high performance concrete (UHPC) has extraordinary mechanical properties and durability, which can improve the structural performances of the existing concrete structure bridge decks. However, relatively few studies on cracking resistance and flexural behaviors of normal concrete (NC) overlay...
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| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-07-01
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| Series: | Case Studies in Construction Materials |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2214509524013391 |
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| Summary: | Ultra-high performance concrete (UHPC) has extraordinary mechanical properties and durability, which can improve the structural performances of the existing concrete structure bridge decks. However, relatively few studies on cracking resistance and flexural behaviors of normal concrete (NC) overlay in bridge deck strengthened by UHPC material have been reported. In this study, eight USNBs representing the UHPC-rehabilitated NC overlays in negative bending moment zone of bridge decks were designed and fabricated for four-point bending tests to investigate the cracking behaviors and flexural performances. One another original NC beam was also investigated for comparison purpose. The following primary experimental parameters were employed, thickness of UHPC-strengthened layer, presence or absence of longitudinal rebars in the UHPC layer, and interfacial connecting method between NC and UHPC. The experimental results show that the additional UHPC layer could significantly increase the cracking resistance increased by 150∼275 % and increase flexural bearing capacity. However, the improvement of cracking resistance and load-bearing capacity was not so significantly affected by the connecting rebars at the interface. In addition, increasing the thickness of the UHPC layer and connecting rebars at the interface can effectively improve the ductility of the test beams, reduce the load deformation of the beams, and significantly reduce the load descending when the specimen failed. At the end, this study proposed theoretical calculation methods for the cracking resistance and flexural bearing capacity of NC-UHPC composite structures. The standard deviations between the calculated values and the experimental values of cracking behaviors and ultimate flexural capacities are 0.071 and 0.153, respectively, indicating that the calculated values of these methods are in good agreement with the experimental values. |
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| ISSN: | 2214-5095 |