Mechanical and bond properties of new generation of carbon fibre reinforced polymer reinforcing bars for concrete structures

This paper presents laboratory test results on the mechanical properties and bond strength of new generation of carbon fibre reinforced polymer (CFRP) reinforcing bars used as nonprestressed reinforcement for concrete structures. Two types of CFRP reinforcing bars, namely, 9-mm-diameter CFRP ribbed bars and 9.5-mm-diameter CFRP sand-coated bars, were investigated. Tensile tests and pullout bond tests were conducted to evaluate the tensile properties and bond strength of the CFRP bars in comparison with that of the steel bar. Experimental results showed that the tensile stress-strain curves of the CFRP bars were linear up to failure. The ultimate tensile strength of the two types of CFRP bars was at least 1500 MPa, three times that of steel bars. The modulus of elasticity of two types of the CFRP bars was 128145 GPa, about 6575% that of steel. Furthermore, both types of the CFRP bars exhibited almost the same bond strength to concrete similar to steel bars. The minimum bond development length for the two types of CFRP bars seemed to be equal to about 20db for the sand-coated bars and 30db for the ribbed bars.Key words: fibre reinforced polymer (FRP), carbon FRP (CFRP), bar, mechanical properties, tensile strength, embedded length, pullout, bond strength, concrete structures.

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Durability of carbon fibre reinforced polymer laminates used to reinforced concrete structures

Science and Engineering of Composite Materials ◽

10.1515/secm.2011.041 ◽

2011 ◽

Vol 18 (4) ◽

Cited By ~ 8

Author(s):

Susana Cabral-Fonseca ◽

João Pedro Nunes ◽

Maria Paula Rodrigues ◽

Maria Isabel Eusébio

Keyword(s):

Reinforced Concrete ◽

Carbon Fibre ◽

Concrete Structures ◽

Reinforced Concrete Structures ◽

Reinforced Polymer ◽

Carbon Fibre Reinforced Polymer ◽

Fibre Reinforced Polymer ◽

Polymer Laminates

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Study the Effect of Mill Scale Filler on Mechanical Properties of Bidirectional Carbon Fibre-Reinforced Polymer Composite

Lecture Notes in Mechanical Engineering - Innovative Design, Analysis and Development Practices in Aerospace and Automotive Engineering (I-DAD 2018) ◽

10.1007/978-981-13-2718-6_13 ◽

2018 ◽

pp. 121-130

Author(s):

Aman Soni ◽

Amar Patnaik

Keyword(s):

Mechanical Properties ◽

Carbon Fibre ◽

Polymer Composite ◽

Mill Scale ◽

Reinforced Polymer ◽

Carbon Fibre Reinforced Polymer ◽

Fibre Reinforced Polymer

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Toughening mechanism of carbon fibre-reinforced polymer laminates containing inkjet-printed poly(methyl methacrylate) microphases

Journal of Composite Materials ◽

10.1177/0021998317727133 ◽

2017 ◽

Vol 52 (11) ◽

pp. 1567-1576 ◽

Cited By ~ 2

Author(s):

Yi Zhang ◽

Jonathan Stringer ◽

Alma Hodzic ◽

Patrick J Smith

Keyword(s):

Mechanical Properties ◽

Fracture Toughness ◽

Carbon Fibre ◽

Spherical Shape ◽

Energy Minimisation ◽

Reinforced Polymer ◽

Carbon Fibre Reinforced Polymer ◽

Fibre Reinforced Polymer ◽

Toughness Testing ◽

Polymer Laminates

It has previously been demonstrated that inkjet-printed thermoplastic microphases are capable of producing a significant increase in mode I interlaminar fracture toughness ( G Ic) in carbon fibre-reinforced polymer with no significant reduction in other mechanical properties or increase in parasitic weight. In this work, the evolution of the microphase structure during processing and how this is influenced by the chosen printing parameters were investigated. Samples were prepared that enabled monitoring of the microphases during all steps of fabrication, with the thermoplastic polymer found to form a discrete spherical shape due to surface energy minimisation. Based upon the morphology and properties of the thermoplastic microphases, it was hypothesised that the increased toughness was due to a combination of crack deflection and plastic deformation of the microphases. Samples were produced for the double cantilever beam fracture toughness testing using the same printing conditions, and both G Ic values and scanning electron microscopy of the fracture surface supported the proposed hypothesis. The feasibility of selective toughening is also demonstrated, which presents potential to tailor the mechanical properties of the carbon fibre-reinforced polymer spatially.

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Carbonaceous Materials Coated Carbon Fibre Reinforced Polymer Matrix Composites

Polymers ◽

10.3390/polym13162771 ◽

2021 ◽

Vol 13 (16) ◽

pp. 2771 ◽

Cited By ~ 3

Author(s):

Bidita Salahuddin ◽

Shaikh N. Faisal ◽

Tajwar A. Baigh ◽

Mohammed N. Alghamdi ◽

Mohammad S. Islam ◽

...

Keyword(s):

Mechanical Properties ◽

Carbon Fibre ◽

Colloidal Particles ◽

Polymer Matrix Composites ◽

Matrix Material ◽

Fibre Surface ◽

Coating Materials ◽

Reinforced Polymer ◽

Carbon Fibre Reinforced Polymer ◽

Fibre Reinforced Polymer

Carbon fibre reinforced polymer composites have high mechanical properties that make them exemplary engineered materials to carry loads and stresses. Coupling fibre and matrix together require good understanding of not only fibre morphology but also matrix rheology. One way of having a strongly coupled fibre and matrix interface is to size the reinforcing fibres by means of micro- or nanocarbon materials coating on the fibre surface. Common coating materials used are carbon nanotubes and nanofibres and graphene, and more recently carbon black (colloidal particles of virtually pure elemental carbon) and graphite. There are several chemical, thermal, and electrochemical processes that are used for coating the carbonous materials onto a carbon fibre surface. Sizing of fibres provides higher interfacial adhesion between fibre and matrix and allows better fibre wetting by the surrounded matrix material. This review paper goes over numerous techniques that are used for engineering the interface between both fibre and matrix systems, which is eventually the key to better mechanical properties of the composite systems.

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An experimental study of the mechanical properties of fibre reinforced polymer (FRP) and steel reinforcing bars at elevated temperatures

Composite Structures ◽

10.1016/j.compstruct.2006.04.069 ◽

2007 ◽

Vol 80 (1) ◽

pp. 131-140 ◽

Cited By ~ 107

Author(s):

Y.C. Wang ◽

P.M.H. Wong ◽

V. Kodur

Keyword(s):

Mechanical Properties ◽

Experimental Study ◽

Elevated Temperatures ◽

Reinforcing Bars ◽

Reinforced Polymer ◽

Fibre Reinforced Polymer

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Mechanical properties of low-velocity impact damaged carbon fibre reinforced polymer laminates: Effects of drilling holes for resin-injection repair

Composite Structures ◽

10.1016/j.compstruct.2019.111806 ◽

2020 ◽

Vol 235 ◽

pp. 111806 ◽

Cited By ~ 1

Author(s):

W.L. Lai ◽

H. Saeedipour ◽

K.L. Goh

Keyword(s):

Mechanical Properties ◽

Carbon Fibre ◽

Low Velocity Impact ◽

Low Velocity ◽

Velocity Impact ◽

Reinforced Polymer ◽

Resin Injection ◽

Carbon Fibre Reinforced Polymer ◽

Fibre Reinforced Polymer ◽

Polymer Laminates

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Bond Performance of Sand-Coated BFRP Bars to Concrete

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.i8321.0881019 ◽

2019 ◽

Vol 8 (10) ◽

pp. 1330-1335

Keyword(s):

Bond Strength ◽

Test Results ◽

Basalt Fibre ◽

Bond Failure ◽

Bond Behaviour ◽

Bond Performance ◽

Reinforced Polymer ◽

Steel Bars ◽

Fibre Reinforced Polymer ◽

Average Bond

This paper presents an experimental study on the bond behaviour of sand-coated basalt fibre reinforced polymer (BFRP) bars and conventional steel bars of 10mm- diameter. The bond strength of these bars were determined according to ASTM D7913/D7913M-14 standards. The pullout specimens consisted of BFRP bars embedded in concrete cubes (200mm on each side) with the compressive strength of 40MPa were constructed. The pullout test results contain the bond failure mode, the average bond strength , the slip at the free and loaded end, and the bond stress-slip relationship curves.The test results showed that the bond strength of sand-coated BFRP bars was about 70% that of the steel bars.

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Moment Connection of Concrete-Filled Fiber Reinforced Polymer Tubes by Direct Embedment into Footings

Advances in Structural Engineering ◽

10.1260/136943308786412023 ◽

2008 ◽

Vol 11 (5) ◽

pp. 537-547 ◽

Cited By ~ 8

Author(s):

Mark Nelson ◽

Yu Ching Lai ◽

Amir Fam

Keyword(s):

Bond Strength ◽

Reinforcing Bars ◽

Moment Capacity ◽

Moment Connection ◽

Reinforced Polymer ◽

Fibre Reinforced Polymer ◽

Embedment Length ◽

Concrete Footing ◽

Frp Tubes ◽

Laterally Loaded

A moment connection of concrete-filled fibre reinforced polymer (FRP) tubes (CFFTs) to concrete footing is explored. The CFFTs are directly embedded into the footings to develop their full moment capacity, in lieu of using mechanical connections, dowel reinforcing bars, or posttensioning methods. CFFT specimens of 219 mm diameter (D) were embedded into footings, at various depths, ranging from 0.3D to 1.5D. The CFFT cantilevered specimens were then laterally loaded to failure. The objective was to establish the critical embedment length, which was found to be 0.73D. Shorter embedment lengths resulted in a bond failure associated with excessive slip, where the full flexural strength of CFFTs was not reached. Specimens with the critical or longer embedment lengths have achieved flexural tension failure of the CFFT, just outside the footing. Ancillary push-through tests were also carried out using CFFT stubs embedded into concrete footings, throughout the full thickness of the footing, and tested under concentric compression loads. The objective was to establish the bond strength between the GFRP tube and concrete footing, which was found to be 0.75 MPa. The bond strength and critical embedment length will vary from case to case. As such, the parameters affecting their values have been identified.

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