An experimental investigation was performed in the laboratory of
the Department of Concrete Structures and Bridges at the Slovak
University of Technology in Bratislava.
In order to asses the effectiveness of the NSM method and
wrapping with CFRP sheets for strengthening concrete columns
submitted to a static axial compression load and cyclic horizontal
load, four series of reinforced concrete columns with dimensions
of 250x250x1500 mm were tested. The first series consisted of
non-strengthened reinforced concrete (RC) columns; the second series was composed of concrete columns strengthened with
CFRP laminate strips before testing; the third series was columns
strengthened with CFRP sheets (Fig.3); and the last series was
composed of columns strengthened with CFRP laminate strips and
sheets.