The bond behaviour between reinforcement and concrete is critical for strength, ductility, and serviceability of reinforced and precast structures. Conventional anchorage systems often face limitations such as long development lengths, premature slip, and radial cracking, compromising joint reliability in precast construction. The system combines chemical adhesion, frictional resistance, and mechanical interlock, while the aluminium sleeve with polymer-modified grout enhances confinement, reduces splitting cracks, and improves durability. This study investigates a novel anchorage system using helically ended rebars embedded in grout-filled aluminium sleeves and confined within M40 concrete cylinders. Pull-out tests were conducted on 10 mm of grade Fe415,12mm of grade Fe500, helical and straight rebars with embedment length of 130 mm,190mm using NS-1Powergrout is a non-shrink grout to ensure dense packing and efficient stress transfer by using a dowel element. The experimental results, including load–slip curves and peak bond strengths, were validated through load displacement curves. The findings confirm that the proposed helical bar–sleeve system ensures enhanced bond efficiency, reduced embedment requirements, improved ductility, and greater reliability for precast and space constrained reinforced concrete applications.
Balasubramanian Ganesh (Tue,) studied this question.