Experimental Investigation of Steel-Concrete Bond for Thin Reinforcing Bars

THE STEEL-CONCRETE BOND IS A FUNDAMENTAL PROPERTY IN REINFORCED CONCRETE STRUCTURES. ALTHOUGH THERE ARE SEVERAL STUDIES ON THE STEEL-CONCRETE BOND, FEW OF THEM HAVE EVALUATED THE PERFORMANCE OF REINFORCING BARS WITH DIAMETERS LESS THAN 10.0 MM, WHICH INCLUDES 5.0, 6.3, AND 8.0 MM DIAMETERS, WHICH ARE NORMALLY USED IN REINFORCED-CONCRETE ELEMENTS. THIS STUDY EXPERIMENTALLY EVALUATES THE BOND BETWEEN THIN STEEL BARS AND CONCRETE OF 25MPA COMPRESSION STRENGTH. THREE TYPES OF METHODS OF TESTING THE BOND-STRENGTH WERE ADOPTED: SURFACE CONFORMATION TEST, PULL-OUT TEST AND BEAM TEST. THE PULL-OUT TEST RESULTED IN BETTER RESULTS IN TERMS OF EVALUATING THE BOND BEHAVIOR. THEREFORE, THE MAIN CONTRIBUTION OF THIS STUDY, BASED ON THE RESULTS OBTAINED AND THE METHODOLOGY USED, IS TO PRESENT A PROPOSAL FOR THE EVALUATION OF STEEL-CONCRETE BOND FOR THIN REBARS.