Sustainability of Lap Splice in Externally Near Surface Mounted Bars of Reinforced Concrete Beam

Abstract

The Near Surface Mounted (NSM) is a method to strengthen and rehabilitate components of the reinforced concrete (RC) flexural and shear strength in the tension side of the concrete, it consists of positioning the reinforcement bars in grooves scratched into the concrete shell. The goal of this research program is to investigate the sustainability of near-surface mounted reinforcing bar tension lap splices in reinforced concrete members subject to monotonic loading. Nineteen concrete beams reinforced with and without spliced deformed reinforcement bars were tested in a four-point bending condition with a constant moment along the mid-span splicing region. The study's main variables were the splice length, type of splice, and diameter of the bars. The structural strength and failure modes of the tested beams are presented and addressed, the splice butt joint showed little notice before failure for none or sufficient splice duration, the adequate splice length improved the rigidity of the beam reinforcement, delayed crack forming and decreased deflection. It is found that the epoxy agent significantly reduces the length of the splice compared to that used in the Egyptian code.