Mechanical grouting sleeve of rebars: experimental investigations

Abstract

To ensure the reliability of prefabricated concrete structures and reduce the cost of sleeve, a new type of mechanical grouting sleeve of rebars was designed. According to the specification of the rebar joint, monotonic axial tension test and cyclic load test of the new rebar sleeve were performed. The working mechanism and connection performance of sleeve were studied. The results show that the unidirectional tensile strength of the sleeve joint can meet the requirement of 1.1 times of the tensile strength of the rebar. The deformation of mechanical grouting meets the requirements of standard under cyclic load. The strength and deformation properties of the rebar joint meet the requirements of standard of JGJ107-2010 for I level joint when the grouting length is large. The working mechanism of the mechanical grouting sleeve is discussed, which provides a new design method for the connection of rebar with different diameters. The research results are of great significance for promoting the development of prefabricated concrete structures.