PERFORMANCE OF REPAIRED CONCRETE COLUMNS UNDER AXIAL LOADING

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Date

2019

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Abstract

The purpose of this research was to determine the performance and axial load capacity of repaired reinforced concrete columns under compressive loading. While various concrete column strengthening methods, using concrete or carbon fiber reinforcing polymer (CFRP) jacketing, have been exhaustively researched, there is an insufficient amount of research regarding the performance of column repairs utilizing concrete removal and replacement. To research this topic, nine reinforced, one-third scale concrete columns were cast; and, six of these columns were repaired with conventional concrete repair methods recommended by the American Concrete Institute’s Guide to Concrete Repair (546-14). Shallow (extending up to the exterior faces of column ties) and deep repairs (extending behind the vertical bars) were performed at the bases of the columns by chipping the concrete with a handheld chipping hammer and patching with a shrinkage compensated repair mortar as it is commonly done for repairing corrosion related spalls. Results of the axial compression loading tests and failure patterns of the repaired columns were compared to that of the control samples. It was found that all repaired concrete columns achieved comparable load capacity values and exhibited the same failure mode as the intact columns.

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