Advantages And Disadvantages Of FRP Composites

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Conventional concrete structures are reinforced with non prestressed and prestressed steel. The steel is initially protected against corrosion by the alkalinity of the concrete, usually resulting in durable and serviceable construction. For many structures subjected to aggressive environments, such as marine structures and bridges and parking garages exposed to deicing salts, combinations of moisture, temperature, and chlorides reduce the alkalinity of the concrete and result in the corrosion of reinforcing and prestressing steel.
The corrosion process ultimately causes concrete deterioration and loss of serviceability. To address corrosion problems, professionals have turned to alternative metallic reinforcement, such as epoxy-coated steel …show more content…

Furthermore, FRP materials do not exhibit yielding; rather, they are elastic failure. So efforts are being made to establish recommendations for design with FRP reinforcement. 1.2 HISTORY OF FRP REINFORCEMENT:
FRP composites are the latest version of the very old idea of making better composite material by combining two different materials that can be traced back to the use of straw as reinforcement in bricks used by ancient civilizations. FRP reinforcement can be found in the expanded use of composites after World War II.
GFRP bars were considered a viable alternative to steel as reinforcement for polymer concrete due to the incompatibility of thermal expansion characteristics between polymer concrete and steel. In the late 1970s, The 1980s market demanded nonmetallic reinforcement for specific advanced technology; the largest demand for electrically nonconductive reinforcement was in facilities for MRI (Magnetic Resonance Imager) medical equipment.
FRP reinforcement became the standard in this type of construction. Other uses developed as the advantages of FRP reinforcement became better known and desired, specifically in seawall construction, substation reactor bases, airport runways, and electronics …show more content…

Unlike steel bars, some FRP bars exhibit a substantial effect of cross-sectional area on tensile strength. For example, GFRP bars from three different manufacturers show tensile strength reductions of up to 40% as the diameter increases proportionally from 0.375 to 0.875 in. (9.5 to 22.2 mm On the other hand, similar cross-section changes do not seem to affect the strength of twisted CFRP strands The sensitivity of AFRP bars to cross-section size has been shown to vary from one commercial product to

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