Evaluation of Bond Strength Between Carbon Fiber Reinforced Polymer (CFRP) Composites with Modified Epoxy Resins and Concrete
Abstract
Rehabilitation and strengthening of concrete structures are becoming more significant
in civil engineering applications. The use of externally bonded Fiber Reinforced
Polymers (FRP) is one of the methods to strengthen and rehabilitate reinforced concrete
members, providing noticeable improvement to their capacity in resisting load. Carbon
Fiber Reinforced Polymer (CFRP) is used along with epoxy resins to evaluate the bond
strength of two commercially available epoxies (EPON 828 and EPON 862) between
CFRP and concrete. In addition, three new combinations that resulted from mixing the
two epoxies were examined. The mechanical properties of epoxy resins are significantly
weaker than this of the CFRP making the epoxy characteristics the determining factor in
the quality of the bond strength. Three-point flexural test was conducted to examine the
bond strength between the CFRP composites and concrete. Further, differential scanning
calorimetry was conducted to examine the glass transition temperature of the resultant
epoxies. The results showed that the optimum composition was a mixture of 70% of
epoxy 828 and 30% of epoxy 862. Therefore, achieving better bond strength and high
glass transition temperature, resulting in CFRP composite with higher fire resistance.
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