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Title |
Deformation Behavior Investigation of Materials by Debonding Failure in Adhesion and Repairing-strengthening Methods of RC Construction
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Keywords |
선팽창계수 ; 탄성계수 ; 탄소섬유 ; 강판 ; 에폭시수지 ; Thermal expansion coefficients ; Elasticity modules ; Carbon fiber ; Steel plate ; Epoxy resin |
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Abstract |
This study investigates the deformation behavior, related to debonding failure, of adhesion and repairing-strengthening materials of RC construction. A strain-stress curve shows that when the stress of specimens reached the highest and then fails, the strain value of cement mortar is 2.0×10-3, while concrete was indicated at around 1.3×10-3, epoxy resins are 0.8×10-3, polymer mortar is 2.5×10-3, steel plate is 2.5×10-3, and carbon bar was 9.1×10-3, respectively. For a thermal expansion coefficient with temperature variation, those basis materials, cement mortar and concrete, exhibited around 10με/℃, but adhesive materials, such as epoxy resins and polymer mortar, were 41～54με/℃ and -0.5～0.7με/℃, respectively. In the case of steel plate is similar to basic materials but carbon fiber is indicates at -1.7με/℃, which is the lowest value. Especially, between basic and adhesive materials, the thermal expansion coefficient was highly different. Although the coefficient depends on the type of epoxy resins, it is clear that the epoxy resins are susceptible to be debonded in nature, when the difference of environmental temperature varies more than 20～35℃.
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