Development Length of Carbon Fiber Reinforced Polymer Bars in Concrete

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Title: Development Length of Carbon Fiber Reinforced Polymer Bars in Concrete

Author(s): Slamah Krem and Khaled Soudki

Publication: Special Publication

Volume: 275

Issue:

Appears on pages(s): 1-18

Keywords: Bond; Concrete; Development length; FRP

Date: 3/1/2011

Abstract:
Fiber reinforced polymer (FRP) reinforcements, with their excellent mechanical and non-corrosive characteristics are being increasingly used as a replacement for conventional steel reinforcement. ACI 440.1R-06 equation for determining the development length of FRP bars is based on Glass FRP (GFRP) bars and may not be applicable for Carbon FRP (CFRP) bars. This paper presents the results of an experimental study on the flexural behavior, bond characteristics, and development length of concrete beams reinforced with CFRP bars. Twelve beams were fabricated and tested. All beams were tested up to failure using a four point bending regime. The results indicated that the average bond strength of CFRP bars in concrete is about 15% higher than those of GFRP bars at comparable concrete strength. The ACI 440.1R-06 over estimated the development length of the CFRP bars by slightly above 30%, while CAN/CSA-S6-06 equation was unconservative by 50%.