Abstract
Drilling and testing core specimens are considered the most common examinations for the reinforced concrete elements. This study brings out new techniques through which the original load-carrying capacity for the cored axially loaded specimens can be restored completely. These techniques consider reshaping the geometry of the circular opening of specimens before repairing to a square or to a rotated square. Moreover, different repairing materials with different compressive and bond strengths to the repaired surface, namely epoxy, grout, and ordinary Portland cement mortars, have been applied. A total of 15 investigated parameters, divided into five groups, in addition to the control specimen were investigated. The results revealed that reshaping the circular opening to a squared one normal to the load application direction, and filling it with epoxy, can completely restore the original capacity of the axially loaded specimens. The finite element model was developed and validated by comparisons with the current experimental results.
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