Enhanced End Anchorage of Bonded FRP Repairs

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Title: Enhanced End Anchorage of Bonded FRP Repairs

Author(s): M.J. Chajes, W.W. Finch, Jr., and H.W. Shenton

Publication: Special Publication

Volume: 230

Issue:

Appears on pages(s): 427-440

Keywords: adhesives; bonding; composite materials; concrete;development length; force transfer

Date: 10/1/2005

Abstract:
When strengthening concrete structures using externally bonded compositematerial plates, the bond between the concrete and plate typically fails well before theplate’s tensile capacity is achieved. To enhance the bond performance, usingcomposite fabric between the plate and the concrete was explored. Six tensiondevelopment specimens were tested to determine the maximum tensile load that couldbe applied to a CFRP plate before it debonded. Three specimens had a Sika CarboDurstrip bonded directly to the concrete, while three others had the CarboDur strip bondedto two plies of Sikawrap Hex 230C fabric material. The fabric was used to distribute theload over a larger bond area. The specimens without fabric failed at an average load of60.5 kN while the specimens with the CFRP fabric failed at an average load of 92.6 kN.These failure loads represent 18 % and 27.5% of the plate capacity respectively.