Experimental investigation on the behaviour of patched reinforced concrete column under eccentric loading: a case of compression failure

Abstract

There are many potential reasons why a reinforced concrete (RC) element's performance is inadequate. Maintaining the
structure's strength and serviceability requires taking the necessary steps to restore the defective element's performance.
Spalling of the concrete cap is one way to detect a defective RC column member. One option would be to choose a patching
approach that would restore the damaged region and, ideally, restore the original strength of the RC column. The purpose of
this study is to determine if patch repair material is effective in restoring the functionality of broken RC columns. This study
compares the performance of patched RC columns to that of a matching regular RC column in order to draw conclusions. In
order to cause compression failure of the RC columns, eccentric loading has been put up in this experiment. Unsaturated
polyester resin mortar (UPR mortar) is used to mend the damaged region in the simulation. Evidently, the patched parts do
not trigger the manner of failure, according to the findings. Because stress is redistributed at the patched section due to the
presence of patching, longitudinal reinforcements and the undamaged zone experience more stress transfer than the regular
column. Patched RC columns can only hold 71% to 92% of the typical RC column's capacity.