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Advances in Concrete Construction
  Volume 7, Number 4, June 2019, pages 219-229

Shear performance of an innovative UHPFRC deck of composite bridge with coarse aggregate
Jianan Qi, Jingquan Wang and Yu Feng

    This paper presents an experimental study on the structural performance of an innovative ultra-high performance fiber reinforced concrete (UHPFRC) deck with coarse aggregate of composite bridge under shear force. Test parameters included curing method and shear span-to-height ratio. Test results indicated that more short fine cracks developed beside the existing cracks due to the randomly dispersed fibers, resulting in re-distributing and homogenizing of the concrete stress beside cracks and allowing for the occurrence of more cracks with small spacing compared to normal strength concrete beams. Curing methods, incorporating steam curing and natural curing, did not have obvious effect on the nominal bending cracking strength and the ultimate strength of the test specimens. Shear reinforcement need not be provided for UHPFRC decks with a fiber volume fraction of 2%. UHPFRC decks showed superior load resistance ability after the appearance of cracks and excellent post-cracking deformability. Lastly, the current shear provisions were evaluated by the test results.
Key Words
    composite bridge; deck; ultra-high performance fiber reinforced concrete (UHPFRC); shear; steel fiber
Jianan Qi, Jingquan Wang and Yu Feng: Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education, School of Civil Engineering,
Southeast University, Nanjing, China

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