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Abstract
The effectiveness of reinforced concrete repairs may be established
in terms of their ability to restore the structural integrity of the reinforced
concrete element and to protect the reinforcement from severe weathering
conditions.
The technique of bonding steel plates usmg epoxy adhesives is
recognized as an effective and convenient method for repair and
rehabilitation of existing reinforced concrete structures. However the
problems associated with the steel corrosion, handling due to excessive size
and weight, undesirable formation of welds, partial composite action with
the surface concrete and deboding, lead to the need for alternative
materials, and further research in this field. The high strength to weight
ratio, resistance to electro-chemical corrosion, larger creep strain, good
fatigue strength, potential for. decreased installation costs and repairs due to
lower weight in comparison with steel, non-magnetic and non-metallic
properties of carbon fib er reinforced polymer (CFRP) composites offer a
viable alternative to bonding of steel plates. The emergence of high strength
epoxies has also enhanced the feasibility of using CFRP sheets and fabric
for repair and rehabilitation.
The mam objective of this thesis is to give better and full
understanding of the flexure behaviour of rectangular reinforced concrete
pre-cracked beams strengthened with Carbon Fiber Reinforced Plastics
(CFRP) sheets.
The experimental program involved testing fourteen R.C. rectangular
beams. They were designed to fail in flexure and tested under flexure in
( ii )