Abstract
The present research investigated the bond behavior of a cleaned corroded reinforcing bar repaired with a partial depth concrete repair and a partial depth concrete repair followed by the application of fiber-reinforced polymer (FRP) sheets. Twelve lap splice beams were cast and tested under static loading. The test variables considered were a partial depth repair with prepackaged self-consolidating concrete (SCC) for six lap splice beams and additional confinement with carbon fiber reinforced polymer (CFRP) sheets for another six beams. The test results for the repaired lap splice beams were compared with those for a monolithic lap splice beam. This research found that the average bond strength increased as the bar mass loss increased for all bonded lengths. The lap splice beams repaired with partial depth were able to repair concrete with similar properties to those of the monolithic concrete. However, they had higher concrete strength than the monolithic beams which showed a higher average bond strength than the monolithic lap splice beams. The beams confined with FRP sheets showed a rise in the bond strength and the equivalent slip by 34–49%, and 56–260% as compared to the unconfined beams, respectively.
Highlights
The lap splice is an effective and simple method to connect reinforcing bars in order to transfer forces between them
The current paper studied the bond behavior of lap splice beams with a corroded reinforcing bar that was cleaned and repaired with partial depth repair and/or fiber-reinforced polymer (FRP) sheets
All of the lap splice beams failed by splitting bond failure
Summary
The lap splice is an effective and simple method to connect reinforcing bars in order to transfer forces between them. Many experimental studies indicated that providing transverse reinforcement or wrapping an RC member with FRP sheets are the most effective methods to confine the critical bond region [8]. The current paper studied the bond behavior of lap splice beams with a corroded reinforcing bar that was cleaned and repaired with partial depth repair and/or FRP sheets. Repairing the corroded RC members to enhance and restore the bond efficiency with a combination of FRP sheets and partial depth repair has not been studied. To cover this gap, this research studies the effect of repairing the cleaned corroded rebar with partial depth repair and/or FRP sheets on the bond behavior of the lap splice beam
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