Bond behavior between reinforcing steel and concrete at elevated temperatures- beam test

The work developed here is on the bond behavior of flexural members at elevated temperature in the range of 20 to 500 o C. Test data is developed by considering different varying parameters of concrete strength of 60 and 60 MPa with 1 % volume fraction of hooked end steel fibers, rebar diameter of 12 and 20 mm, different heating protocols slow heating rate (2 o C/min) and rapid heating rate (ISO-834). Beam test is conducted to evaluate the bond stress-slip behavior. Bond stress slip behavior is similar in all the cases irrespective of magnitude. Absolute bond force is more in the case of larger diameter rebar due to more stress concentration in the bonded area. Reduction of bond strength is more in the case of larger diameter, higher strength concrete and rapid heating rate. Reduction of bond strength is more significant in the case of rapid rate of heating in all the cases.