Abstract
Research into the technique of bonding steel reinforcement externally to hardened concrete is described. Laboratory work consisted of testing 4.9 m and 3.5 m beams, with steel plates bonded to their tension flanges, in 4-point bending. Results showed that a full composite action was provided by the adhesive and that significant improvements in performance could be achieved in terms of ultimate load, crack control, and stiffness. Exposure tests are being carried out on 0.5 m unreinforced concrete beams with steel plates bonded to one face. Results to data have shown that significant amounts of corrosion of the steel plate may take place during natural exposure. The resin and concrete consist of a labyrinth of very fine interconnected cracks through which corrosive salts can migrate. The corrosion may cause slight reductions in strength.
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