Abstract
As a solution against the serviceability problem caused by the cracks occurring at the UHPC precast deck-joint interface, this study proposes a method exposing the steel fiber at the interface and evaluates the corresponding flexural performance of the lap spliced construction joint. After having slowed down the strength development of the concrete placed in the joint of the precast deck by means of a curing retardant, the concrete at the interface is crushed so as to expose the steel fibers and the change in the flexural performance is observed experimentally according to the exposure of the steel fibers. The results show that, even if the ultimate strength and stiffness of the UHPC precast deck including the joint are mostly determined by the arrangement details of the rebar lap splice, the exposure of the steel fibers can secure stable ductile behavior and reduce the width of the cracks generated at the precast deck-joint interface under service load.
Highlights
Ultra-High Performance Concrete (UHPC) is the latest concrete featured by an ultra-high strength larger than 150 MPa and high toughness with a tensile strength higher than 5 MPa
According to the results of the research led at KICT, the lap-spliced connection satisfied the ultimate strength and allowable deflection criteria under service load recommended by the Korea Highway Bridge Design Code [7] but failed partially in satisfying the allowable crack width under service load prescribed in the Concrete Design Code and Commentary of the Korea Concrete Institute [8]
A method using curing retardant for the exposure of steel fiber at the precast deck-joint interface was proposed in order to improve the serviceability to cracking of the lap spliced UHPC precast deck joint
Summary
Ultra-High Performance Concrete (UHPC) is the latest concrete featured by an ultra-high strength larger than 150 MPa and high toughness with a tensile strength higher than 5 MPa. Studies were performed to simplify the sectional details and minimize the size of the connection in the precast deck using the high compressive strength and bond strength of UHPC. The Korea Institute of Civil Engineering and Building Technology (KICT) conducted performance evaluation tests on precast deck connections subjected to positive moments in order to develop UHPC precast decks for cablestayed bridges. This study intends to evaluate the width control effect of the cracks generated in the connection by the exposure of the steel fiber contained in the contact interface between the joint and precast deck in a will to secure the serviceability of the UHPC precast deck with joint. The change in the flexural performance of the connection is evaluated according to the exposure of the steel fiber
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