Towards innovative FRP fabric reinforcement in concrete beams: concrete–CFRP bond

The paper reports results of an experimental investigation into load response and failure behaviour of rectangular prismatic concrete beams reinforced with a combined flexural and shear reinforcement system made from carbon fibre reinforced polymer (CFRP) fabric. It is shown that CFRP U-channels with aggregate coating and an anchorage system consisting of a lipped channel section with intermittent closed loops were found to provide improved composite action between the CFRP reinforcement and concrete. These CFRP channels also ensured adequate strength and ductility before failure. Possible modes of failures of the beams are discussed as is the effect of the design parameters on the failure mode and the failure load. It is anticipated that the findings of this paper could be effectively used in other applications such as non-prismatic concrete geometries and as permanent formwork/reinforcement in thin concrete members where the flexible characteristics of dry CFRP fabrics are most useful.

[1]  W. Punurai,et al.  Biaxially loaded RC slender columns strengthened by CFRP composite fabrics , 2013 .

[2]  Brahim Benmokrane,et al.  Recent developments on FRP bars as internal reinforcement in concrete structures , 2014 .

[3]  Denvid Lau,et al.  Effect of reinforcement ratio on the flexural performance of hybrid FRP reinforced concrete beams , 2017 .

[4]  Gaetano Manfredi,et al.  Behavior and Modeling of Bond of FRP Rebars to Concrete , 1997 .

[5]  이종구.  Textile Reinforced Concrete , 2015 .

[6]  J. Larralde,et al.  Bond and Slip of FRP Rebars in Concrete , 1993 .

[7]  Li Ming,et al.  Bond behavior of roughing FRP sheet bonded to concrete substrate , 2014 .

[8]  E. Gudonis,et al.  FRP reinforcement for concrete structures: state-of-the-art review of application and design , 2013 .

[9]  Mithila Achintha.  Environmental impact and embodied energy , 2016 .

[10]  Brahim Benmokrane,et al.  Combined effects of saline solution and moist concrete on long-term durability of GFRP reinforcing bars , 2013 .

[11]  F. Slate,et al.  Microcracking of Plain Concrete and the Shape of the Stress-Strain Curve , 1963 .

[12]  Maria Antonietta Aiello,et al.  Bond performances of FRP rebars-reinforced concrete , 2007 .

[13]  John Orr,et al.  Flexible formwork for concrete structures , 2012 .

[14]  L. Sneed,et al.  Review of Anchorage Systems for Externally Bonded FRP Laminates , 2013, International Journal of Concrete Structures and Materials.

[15]  Byung-Suk Kim,et al.  Bond characteristics of coarse sand coated interface between stay-in-place fibre-reinforced polymer formwork and concrete based on shear and tension tests , 2010 .

[16]  Paththini Marakkala Mithila Achintha,et al.  Fracture analysis of debonding mechanism for FRP plates , 2010 .

[17]  Timothy Ibell,et al.  Developing an innovative lightweight concrete flooring system for sustainable buildings , 2017 .

[18]  Kypros Pilakoutas,et al.  Bond Behavior of Fiber Reinforced Polymer Bars under Direct Pullout Conditions , 2004 .

[19]  Rajesh P. Dhakal,et al.  Cyclic beam bending test for assessment of bond–slip behaviour , 2013 .

[20]  Michael Horstmann,et al.  Experimental investigations on Textile-Reinforced Concrete (TRC) sandwich sections , 2014 .