Composition and Magnitude of Interface Bond Stress of Steel Reinforced Recycled Concrete

Abstract:

In order to study the composition of bond stress for steel reinforced recycled concrete (SRRC), composition of bond stress between steel and recycled aggregate concrete was analyzed first, and according to the push out test of 17 specimens, the whole process of SRRC interface bond slip was analyzed. Then, on the basis of the test and theoretical analysis, the level of chemical cementation stress and friction stress of SRRC interface were solved out, and the calculation formula of critical stick length lcr when steel yield was derived. Finally, factors influencing the level of chemical cementation stress and friction stress were analyzed. Results show that increasing concrete strength, stirrup ratio and thickness of the protective layer can enlarge friction stress, and increasing the protective layer thickness can increase friction stress and chemical cementation stress.

Key words:steel reinforced recycled concrete; bond stress; chemical cementation stress; friction stress; bond divorced length