FRP reinforced concrete exposed to elevated temperatures: The role of viscosity on bond strength

Abstract

There is overwhelming consensus among researchers that the bond strength between concrete and fiber reinforced polymer composite materials would be the first to yield when the composite is exposed to high temperatures. In this chapter, a semi-empirical model is developed that accounts for molecular bond breakup and viscosity conversion degree rate values to predict the normalized bond strength at elevated temperatures. The model is assessed with limited experimental data from available literature. Our results show that the proposed approach correlates well with the available experimental results. This formulation can be used for design of FRP reinforced concrete members at elevated temperatures, particularly in identifying critical bond strength and comparison of alternative proposed FRP reinforcing systems.