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Ultra-high performance concrete (UHPC) was suitable for bridge reinforcement engineering. Therefore, the effects of water-binder ratio, mineral powder content, and steel fiber content on the workability, mechanical properties, and durability of ultrahigh-performance concrete (UHPC) were analyzed through tests for fluidity, flexural compressive strength, and chloride ion diffusion coefficient in the paper. On this basis, a high-flow UHPC for bridge pier reinforcement was developed, which expansion degree was 820 mm. The 28 d tensile strength and compressive strength of UHPC without steam curing were 9.9 MPa and 147 MPa respectively, and the chloride ion diffusion coefficient was 2.69 × 10–14 m2/s. Combining the characteristics of UHPC and glass fiber reinforced polymer (GFRP), the UHPC + GFRP composite reinforcement technology for piers in marine environments was designed, and the interface performance was verified by the test pier. The result showed that the interface bonding performance of UHPC + GFRP for bridge reinforcement was excellent, which the bond strength of UHPC-GFRP interface was 3.87 MPa.

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Research on UHPC + GFRP Composite Reinforcement Technology for Piers in Marine Environments

  • 会议论文

  • 发表日期：

    2025年

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  • Mingzi Gong,
  • Tao Wang,
  • Haitang Chen,
  • Xianpeng Rao,
  • Chen Chen,
  • Bin Huang

摘要

Ultra-high performance concrete (UHPC) was suitable for bridge reinforcement engineering. Therefore, the effects of water-binder ratio, mineral powder content, and steel fiber content on the workability, mechanical properties, and durability of ultrahigh-performance concrete (UHPC) were analyzed through tests for fluidity, flexural compressive strength, and chloride ion diffusion coefficient in the paper. On this basis, a high-flow UHPC for bridge pier reinforcement was developed, which expansion degree was 820 mm. The 28 d tensile strength and compressive strength of UHPC without steam curing were 9.9 MPa and 147 MPa respectively, and the chloride ion diffusion coefficient was 2.69 × 10–14 m2/s. Combining the characteristics of UHPC and glass fiber reinforced polymer (GFRP), the UHPC + GFRP composite reinforcement technology for piers in marine environments was designed, and the interface performance was verified by the test pier. The result showed that the interface bonding performance of UHPC + GFRP for bridge reinforcement was excellent, which the bond strength of UHPC-GFRP interface was 3.87 MPa.