LAUSR

Strengthening steel bars are usually gathered and sent to scrap sites, where they are melted, and made again into a new reinf orcement bar. In Jordan, the demolition of old buildings is cre ating a growing industry together.The entrepreneurs collect th e used steel reinforcement bars (rebars), and manually strain t hem and then market them at half the price of the new steel ba rs. If the use of these bars is appropriate, more benefits will be achieved, such as saving energy required to manufacture steel bars, and reducing CO2 emissions. The aim of this paper is to analyze how well the stressed steel bars are appropriate for use with the new concrete in terms of bonding strength.