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In the present study, the structural behavior of post-cast Ultra-high-performance Concrete (UHPC) joints for connecting prefabricated wall components to the base slab in a biological reaction tank was investigated. Three prefabricated wall specimens with UHPC joints aged for 1, 3, and 28 days were compared to a control specimen made from C35 normal strength concrete through quasi-static tests. Pivotal experimental results revealed that prefabricated walls with 1-day and 3-days UHPC joints exhibited ultimate load-bearing capacities comparable to the monolithic 28-days C35 concrete wall, suggesting a significant potential for accelerating construction timelines. The prefabricated wall with 3-days UHPC joints showed improvements of 38.7% in crack resistance and 25.1% in yield strength compared to 1-day UHPC joints. The prefabricated wall with 28-days UHPC joints demonstrated increases in yield strength, ultimate strength, and equivalent viscous damping coefficient by 47%, 9%, and 12%, respectively, compared to the monolithic C35 concrete wall. The integration of end-hooked steel fiber characteristics into the numerical simulations facilitated accurate simulation of the bonding behavior of rebars in UHPC joints.

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Structural Behavior of Post-Cast UHPC Joints Connecting Prefabricated Walls and Base Slab: Experimental Investigations and Multi-scale Modeling

  • 会议论文

  • 发表日期：

    2025年

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  • Ding-Li Jin,
  • Yong Yuan,
  • Ming-Hong Sun,
  • Janos Logo,
  • Jiao-Long Zhang

摘要

In the present study, the structural behavior of post-cast Ultra-high-performance Concrete (UHPC) joints for connecting prefabricated wall components to the base slab in a biological reaction tank was investigated. Three prefabricated wall specimens with UHPC joints aged for 1, 3, and 28 days were compared to a control specimen made from C35 normal strength concrete through quasi-static tests. Pivotal experimental results revealed that prefabricated walls with 1-day and 3-days UHPC joints exhibited ultimate load-bearing capacities comparable to the monolithic 28-days C35 concrete wall, suggesting a significant potential for accelerating construction timelines. The prefabricated wall with 3-days UHPC joints showed improvements of 38.7% in crack resistance and 25.1% in yield strength compared to 1-day UHPC joints. The prefabricated wall with 28-days UHPC joints demonstrated increases in yield strength, ultimate strength, and equivalent viscous damping coefficient by 47%, 9%, and 12%, respectively, compared to the monolithic C35 concrete wall. The integration of end-hooked steel fiber characteristics into the numerical simulations facilitated accurate simulation of the bonding behavior of rebars in UHPC joints.