Fiber
Reinforced Laminates are widely used to strengthen concrete members suffering
from
deterioration. Stress
transfer between the strengthened concrete and the
strengthening laminate depends on the surface quality of the concrete. In the
case of
deteriorated concrete, stress transfer is complicated due to the
gradient in its properties when going from the deteriorated surface to the healthy
bulk concrete. This work presents the mechanism of stress transfer between
carbon and glass FRP laminates and concrete with deteriorated surface.
Different modes of failure were identified, ranging from horizontal shear of
the deteriorated concrete at the surface to diagonal shear of the beam. It was
found that a significant amount of stress is transferred by friction within the
deteriorated surface, leading to remarkable load-bearing capacities.