Title: Effect of Tensile Strength and Ductility of UHPC on the Development Length of Steel Reinforcement

Author(s): Amr Soliman

Publication: Web Session

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Date: 3/28/2022

Abstract:
In the last decade, Ultra-High-Performance Concrete (UHPC) has been used for a variety of accelerated bridge construction applications, including field cast connections between precast concrete segments. Such applications utilize the superior mechanical properties of UHPC that lead to better bond with the steel reinforcement, thus simplifying the connection reinforcement. However, the effects of the fundamental tensile properties of UHPC (tensile strength and strain capacity) on the bond strength with reinforcement steel have not been evaluated sufficiently, except for the effect of different volume fractions of fibers on rebar-UHPC bond. To address this knowledge gap, a series of rebar pullout tests were performed in this study using three UHPC mixtures with different tensile strengths and strain capacities. The specimens were fabricated using 13 mm diameter bars, with varying cover thickness and embedment length. It was found that higher tensile strength of the UHPC led to a significant improvement in the bond strength. On the other hand, the tensile ductility did not affect the bond strength significantly.