Durability of FRP strengthened reinforced concrete flexural members for bridge structures

Abstract

The use of externally bonded Fibre Reinforced Polymer (FRP) composites has become a popular means to strengthen and repair bridge and building infrastructure in recent years. The use of FRP composites as an alternative to steel plates presents a more sustainable option for structures such as concrete, steel or timber bridges subjected to aggressive environments. However, the long-term service life and durability of FRP strengthened structures is of importance and in Australia alone it is estimated that 70% of concrete bridge infrastructure are in need of repair or strengthening due to material degradation over time and increased traffic loading. This paper presents work done to date by the authors on the long-term durability of the critical bond between the FRP and concrete considering environmental conditions and material durability.