Framework for Durability-Based Design for Concrete-Steel Bond against Corrosion

The current understanding of the mechanics of bond resistance at the interface between concrete and plain and deformed steel bars is reviewed briefly along with the influence of corrosion on the phenomenon. Some of the available research on analytical models in both corroded and uncorroded steel bars is also reviewed. The influence of some of the significant parameters influencing the behavior of corroded bars, such as the concrete strength, crack width, extent of rebar corrosion (measured by mass loss), concrete cover thickness, bar diameter, and the loss of rebar lugs is reviewed. In addition, a preliminary framework is presented for design of reinforced concrete for durability against deterioration of bond due to steel rebar corrosion. A framework for design of structural concrete for durability against deterioration of bond at the steel-concrete interface due to corrosion of rebars is proposed. The technical note also stresses the need for more research on the above and other parameters influencing the deterioration of bond due to corrosion, before establishing a reliable design method using a semiprobabilistic approach in the design of structural concrete for other phenomena.