Study on Construction Method and Durability of Carbon Fiber-Reinforced Plastic Sheet for Retrofitting Reinforced Concrete Structures

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Title: Study on Construction Method and Durability of Carbon Fiber-Reinforced Plastic Sheet for Retrofitting Reinforced Concrete Structures

Author(s): Y. Masuda, K. Motohashi, T. Kage, and T. Ina

Publication: Special Publication

Volume: 192

Issue:

Appears on pages(s): 899-916

Keywords: adhesives; carbon fiber-reinforced plastic; epoxy resins; finishes; lap connections

Date: 4/1/2000

Abstract:
In recent years, Carbon Fiber Reinforced Plastic (CFRP) sheet has been used to repair and retrofit reinforced concrete structures. Considerable experiment work related to the seismic resistant performance of this method has been conducted; however, some details of this construction procedure and durability of this repair method require further study. In this study, experimental work and analysis was conducted to study the influences of lap length on CFRP sheet layer to tensile stress, the influences of time interval on lapping to lap-joint tensile strength, and strengthening method of CFRP sheet having an opening. The effect of finishing materials on durability using this method and durability of finish themselves was tested. As the results indicate, the tensile strength of the lap joint using epoxy resin and the influences of time interval when lapping is performed are clarified. The effect of strengthening method of CFRP sheet on an opening part is stated. Adhesive strength between the concrete surface and CFRP sheet does not change in the period of this experiment. The mortar finish bonded on the surface of the CFRP sheet with adhesive and sand has a risk to peel off.