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

Abstract

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.

Novel Ductile FRP System for Concrete Reinforcement: Concept and Experimental Characterization

“…Over the last few decades, the use of FRP as reinforcement in concrete members has gained interest among the researchers and designers owing to the corrosion resistance, high strength and low-weight characteristics of the materials. (Achintha et al 2018;Achintha M 2009;Lou et al 2016Lou et al , 2017ab;Lou and Karavasilis 2018;Sun et al 2017aSun et al , 2018Sun 2018;Sun et al 2016Sun et al , 2017bSun and Ghannoum 2015). Despite FRPs being more expensive than steel on a unit weight basis, it is anticipated that the innovative use of the material together with its long-term benefits such as low maintenance and high durability may enable FRP reinforcement systems to be a viable alternative to steel reinforcement.…”

Exploitation of FRP fabric Reinforcement: Innovation beyond FRP bars

“…Three-dimension (3D) FRP fabric reinforcements have been developed to provide a combined shear and 37 flexural reinforcement for concrete structures [16]. It is found that this 3D reinforcement can greatly 38 improve FRP-concrete bond allowing both adequate strength and desired ductility to be effectively 39 developed [16].…”

“…Three-dimension (3D) FRP fabric reinforcements have been developed to provide a combined shear and 37 flexural reinforcement for concrete structures [16]. It is found that this 3D reinforcement can greatly 38 improve FRP-concrete bond allowing both adequate strength and desired ductility to be effectively 39 developed [16]. Further development of the 3D reinforcement is expected to aid in achieving structurally 40 optimized (non-prismatic) concrete members consuming significantly less concrete materials [17], and 41 be used for stay-in-place formwork therefore significantly reducing the required construction effort [18].…”

“…Both these benefits have potentials for ensuring much lower-impact alternatives than that of conventional 43 concrete structures [16].…”

“…2 (b)). Although the U-322 channel reinforcement with intermitted closed loops could increase the 𝜀 𝑐_𝑡𝑜𝑝 at the ultimate from 323 0.0019 to 0.003, its geometry inhabited forming adequate FRP-concrete bond within the internal faces 324 and corners of the channel, resulting in softer load-deflection responses [16]. It should be noted that IBIS…”