Compressive Stress-Strain Behavior of Composite Ordinary and Reactive Powder Concrete

Abstract: 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 the lowest probable level. Good bond is one of the main requirements for successful repair. The main aim of this study was to investigate the compressive stress-strain behaviour of the composite specimens consist of ordinary 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. Key words: Reactive powder concrete Bond strength Repair material Substrate Compressive stress-strain INTRODUCTION and high durability and makes them potentially suitable Reduction in the useful service-life of reinforced reinforced concrete structures [6, 7]. concrete construction is a major problem confronting the A number of studies [8-11] have used RPC as a repair construction industry worldwide. Repair and rehabilitation or composite material to strengthen OC structural of deteriorated concrete structures are essential not only members. However, very little information on the behavio