www.tjprc.org editor@tjprc.org BOND SLIP BEHAVIOR OF REINFORCED STEEL AND CONCRETE V. PREETHA 1 , S. NAVANEETHA 2 , K. KALAIVANI 3 & V. SENTHILKUMAR 4 1 Assistant Professor (Sr.G), Department of Civil Engineering, Bannari Amman Institute of Technology, Erode, Tamil Nadu, India 2,3 PG Students, Department of Civil Engineering, Bannari Amman Institute of Technology, Erode, Tamil Nadu, India 4 Associate Professor, Department of Civil Engineering, Bannari Amman Institute of Technology, Erode, Tamil Nadu, India ABSTRACT The performance of bond behavior between steel and concrete in reinforced concrete structure is a major part in load transfer mechanism. The transfer of stress between reinforcement and concrete in the longitudinal direction of the bars is known to be bond. Bond strength is imperative in reinforced concrete, which means that load transfer and the structural behavior is achieved by the combination of two materials. Sufficient bond strength ensures that there is little or no slip between steel and concrete and helps in the safe transfer of stress between them. Anchorage of reinforcement depends on the bond between steel and concrete, crack width and crack spacing. Stiffness, deformation and dynamic behavior are also a function of bond. In this article the experimental investigations on bond strength is studied for M20 grade of concrete. Pull out test is carried out using universal testing machine, the load at a relative movement (slip) between steel and concrete at the free end of the bar is manipulated. The main objective of the study is to come out with a relationship between bond strength and different influencing factors affecting the bond strength as per IS 2770-1967. KEYWORDS: Concrete, Reinforcement, Bond Strength & Bond Stress Received: Mar 02, 2019; Accepted: Mar 22, 2019; Published: Apr 11, 2019; Paper Id.: IJCSEIERDJUN20192 INTRODUCTION The reinforced concrete consists of both concrete and steel to take care of compression and ductile in tension. To maintain the composite action transfer of load between the concrete and steel is ensured by means of bond stress [1]. For reinforced concrete structures the bond stress capacity of the element exceeds the demand and there by relatively little slip between the steel and the surrounding concrete. Plain reinforced bar without lugs on the surface exhibit more deformations and therefore cannot transfer proper bond forces by mechanical interlocking [4]. But the bond is transferred by means of adhesion between the concrete and the reinforcing bar before slip occurs. The wedging action that break the concrete upon slip. Usually, bond behavior is predicted by bond stress versus slip relationship by experimental data using pull out study [6]. The pullout test predicts the exact failure mechanism of bond and therefore allows for accurate assessment of bond capacity. Here the experimental work is done to analyze the depth of embedment and variable diameter of reinforced bar in to the concrete surface. It is necessary to institute accurate bond stress-slip relationship in a reinforced concrete member, which is usually based on depth of embedment and axial tension force at the cracking position [18]. Original Article International Journal of Civil, Structural, Environmental and Infrastructure Engineering Research and Development (IJCSEIERD) ISSN (P): 2249-6866; ISSN (E): 2249-7978 Vol. 9, Issue 3, Jun 2019, 9-16 © TJPRC Pvt. Ltd.