Today, properties of lightweight aggregate concrete (LWAC) and its bond behavior arent known as well as ordinary concrete. Current national and international codes, related to reinforced concrete, are usually prepared by evaluating the results of experimental and theoretical studies together on concrete with lower compressive strength than 50 MPa and higher unit weight than 2000 kg/m3. Unfortunately, it isnt possible to say that equations and suggestions given in these codes are valid for LWAC nowadays due to the lack of sufficient and dependable datas. However, LWAC has been used in many engineering structures and its usage has been getting prevalent increasingly, recently. The main objective of this study is to investigate comparatively bond behavior of LWAC which is produced by using one of the lightweight aggregates of Eastern Black Sea Region and ordinary concrete in bending using bending test. The study, carried out for this purpose, has three main chapters. In the first chapter, LWAC, properties and history of this concrete, its some superiorities and disadvantages on ordinary concrete, aggregates which is used, research done about this subject before and some knowledges related to bond between steel rebars and concrete are given for reminding. The second chapter is allocated to the study fulfilled. Here, some properties of materials and the concretes, bond test in bending carried out on the beams produced with these concretes, in addition, findings and discussions are tried to give. Finally, principal results and suggestions obtained from the study are summarized in the last chapter and this is followed by the list of references and biography. Results obtained from the study show that bond strength between LWAC and steel rebars is lower than ordinary concrete considerable. Consequently, it is indicated that rules and suggestions about bond between steel rebars and concrete in our current national codes (TS 500-2000, TDY-2007) arent valid for structures which will be built using LWAC.
Key Words: Bond Strength, In bending, LWAC, Ordinary Concrete, Ribbed Steel Rebar, Experimental and theoretical, Comparison.