Effect of Post-Heated Concrete Cylinders Repaired with CFRP Reinforcement

2012 ◽  
Vol 626 ◽  
pp. 620-624
Author(s):  
Sharifah Salwa Mohd Zuki ◽  
J. Jayaprakash ◽  
Lee Kit Hock ◽  
Ong Chong Yong
Keyword(s):  
Carbon Fibre ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Axial Loading ◽  
Reinforced Polymer ◽  
Concrete Cylinders ◽  
Carbon Fibre Reinforced Polymer ◽  
Different Temperatures ◽  
Fibre Reinforced Polymer ◽  
Heated Concrete

This paper presents the experimental results of post-heated concrete cylinders repaired externally using Carbon Fibre Reinforced Polymer (CFRP) fabrics. Eighteen concrete cylinders of size 155mm x 300mm were exposed to different temperatures of 100, 200, and 300°C for 3 hours. Subsequently, the exposed concrete cylinders were naturally cooled down to room temperature and repaired externally using CFRP reinforcement. All these cylinders were tested to failure under axial loading. Results show that the residual strength of post-heated CFRP repaired concrete cylinders was significantly increased between 47 to 51% over the control cylinders. However, the ductility of CFRP repaired concrete cylinders was increased at the elevated temperatures.

scholarly journals Prediction of failure in notched carbon-fibre-reinforced-polymer laminates under multi-axial loading

2016 ◽  
Vol 374 (2071) ◽  
pp. 20150273 ◽  
Author(s):  
J. L. Y. Tan ◽  
V. S. Deshpande ◽  
N. A. Fleck
Keyword(s):  
Carbon Fibre ◽  
Damage Evolution ◽  
Structural Integrity ◽  
Axial Loading ◽  
Element Model ◽  
Reinforced Polymer ◽  
Failure Envelopes ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Polymer Laminates

A damage-based finite-element model is used to predict the fracture behaviour of centre-notched quasi-isotropic carbon-fibre-reinforced-polymer laminates under multi-axial loading. Damage within each ply is associated with fibre tension, fibre compression, matrix tension and matrix compression. Inter-ply delamination is modelled by cohesive interfaces using a traction-separation law. Failure envelopes for a notch and a circular hole are predicted for in-plane multi-axial loading and are in good agreement with the observed failure envelopes from a parallel experimental study. The ply-by-ply (and inter-ply) damage evolution and the critical mechanisms of ultimate failure also agree with the observed damage evolution. It is demonstrated that accurate predictions of notched compressive strength are obtained upon employing the band broadening stress for microbuckling, highlighting the importance of this damage mode in compression. This article is part of the themed issue ‘Multiscale modelling of the structural integrity of composite materials’.

Protection of reinforced concrete beams retrofitted by carbon fibre-reinforced polymer composites against elevated temperatures

2010 ◽  
Vol 37 (9) ◽  
pp. 1171-1178 ◽  
Author(s):  
H. Elkady ◽  
A. Hasan
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fibre ◽  
Fire Test ◽  
Elevated Temperatures ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Fire Tests ◽  
Reinforced Polymer ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer

This paper presents the outcome of the first part of a 3 year project aiming to investigate the effect of elevated temperatures on carbon fibre-reinforced polymer (CFRP) retrofitted structures. Accordingly, different protecting mixes to be used as thermal insulating covers were proposed and evaluated. This experimental program addresses a series of indirect fire tests on reinforced concrete beams retrofitted with CFRP laminates exposed to a temperature of 900 °C (1652 °F) after being protected with ten types of special mortar covers. Materials known for their low coefficient of thermal conductivity were added in certain ratios to form mortars for these protective covers. Tests were carried out in a test furnace designed to produce the standard temperature–time curve specified in ASTM E119–95a. Scale effect was considered by proper adjustment of the exposure time to fire test. Temperature at the CFRP level, just below the protecting covers, was monitored to determine the efficiency of the covers in reducing heat transfer during the fire test. Furthermore, mechanical bending load tests were performed on specimens before and after fire tests to determine reduction in flexure failure load of the specimens due to indirect fire exposure. This reduction was found to vary from 10% to 48% for different tested coatings. In spite of the high damage in the protection covers expressing the lowest performance, reinforced concrete beams were still unaffected and could be restrengthened to return to their original status. Recommendations showing proper thicknesses of application and necessary precautions to be taken when using CFRP in retrofitting reinforced concrete structures to enhance their fire resistance were presented.

scholarly journals Compression Behaviour of Concrete Cylinder with Carbon Fibre Reinforced Polymer (CFRP) Confinement

2021 ◽  
Vol 18 (1) ◽  
pp. 27
Author(s):  
Norsalwa Aisyah Senu ◽  
Ruqayyah Ismail ◽  
Norlizan Wahid ◽  
Hazrina Ahmad ◽  
Fariz Aswan Ahmad Zakwan
Keyword(s):  
Carbon Fibre ◽  
Load Capacity ◽  
Concrete Column ◽  
Compression Load ◽  
Concrete Cylinder ◽  
Reinforced Polymer ◽  
Concrete Cylinders ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
Cfrp Confinement

Carbon fibre reinforced polymer (CFRP) confinement has always been one of the strengthening methods available for a vulnerable concrete column. This paper presents the compressive behaviour of nine circular concrete cylinders with CFRP confinement. Three different specimen conditions considered; full CFRP confinement, partial CFRP confinement and unconfined (control specimen). Nine concrete cylinders with 100 mm x 200 mm were tested under compression load.  It is discovered that full and partial CFRP confinement had improved concrete cylinder ultimate load capacity by 300% and 150% respectively when compared to the unconfined concrete cylinder. With 150% strength enhancement achieved by partial CFRP confined specimen, it is proven that partial CFRP confinement does provide sufficient confinement in enhancing concrete column strength as full CFRP confinement. This finding has led to remarkable discoveries which with lesser CFRP used the functionality of CFRP as strengthening material can still be utilized. Therefore, could contribute significant input to the construction industry in using lesser CFRP for more sustainable material approach.

Influence of Ply Stacking Sequences on the Impact Response of Carbon Fibre Reinforced Polymer Composite Laminates

2019 ◽  
Author(s):  
Kristian Gjerrestad Andersen ◽  
Gbanaibolou Jombo ◽  
Sikiru Oluwarotimi Ismail ◽  
Segun Adeyemi ◽  
Rajini N ◽  
...  
Keyword(s):  
Carbon Fibre ◽  
Polymer Composite ◽  
Composite Laminates ◽  
Impact Response ◽  
Reinforced Polymer ◽  
Carbon Fibre Reinforced Polymer ◽  
Fibre Reinforced Polymer ◽  
The Impact
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