Bassam A. Tayeh - Civil Engineering Department, Islamic University of Gaza, Gaza, Palestine
B.H Abu Bakar - School of Civil Engineering, Universiti Sains Malaysia, Engineering Campus,۱۴۳۰۰ Nibong Tebal, Pulau Pinang, Malaysia
M.A Megat Johari - School of Civil Engineering, Universiti Sains Malaysia, Engineering Campus,۱۴۳۰۰ Nibong Tebal, Pulau Pinang, Malaysia
S.M Tayeh - Civil Engineering Department, Islamic University of Gaza, Gaza, Palestine

The deterioration of reinforced concrete structures is a major social problem. To minimize this problem and ensure effective structural management, the number and extent of repair interventions must be kept at thelowest probable level. Good bond is one of the main requirements for successful repair. The main aim of thisstudy was to investigate the compressive stress-strain behaviour of the composite specimens consist ofordinary concrete (OC) substrate as old concrete and reactive powder concrete (RPC) as a retrofitting material, by using different types of OC substrate surface preparation methods. The results showed that the composite OC/RPC specimens were able to behave closely to individual OC, in the case of using OC substrate with surface prepared by sand blasted.

Reactive powder concrete Bond strength Repair material Substrate Compressive stress-strain