Abstract
A wet connection for prefabricated slabs using Ultra-High-Performance Concrete (UHPC) was proposed and experimentally investigated. Influence of parameters such as the lap length of dowel rebar, the groove key size and the arrangement of post-placed rebar in grooves were comparatively explored. Four tensile specimens and eight flexural specimens were designed and tested. The crack development, failure mode, load-deformation characteristics, strains and bearing capacity were observed and analyzed. The results indicated that the lap length of dowel rebar significantly influenced the failure mode. Dowel rebar with insufficient lap length in post-cast UHPC connection exhibited rebar pulling-out failure, and lap length of 12 times diameter of the dowel rebar could achieve mechanical performance equivalent to cast-in-situ construction. Based on analysis of the test results, the prediction for tensile capacity of UHPC connection was recommended based on existing prediction formula for bonding stress of rebar in concrete, and the theoretical predicting formulas for flexural bearing capacity and deflection of prefabricated slabs having different dowel rebar lap lengths in UHPC connection were proposed, which showed good agreement with test results.
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