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Open AccessArticle

Effect of the Fiber Type and Axial Stiffness of FRCM on the Flexural Strengthening of RC Beams

Department of Civil and Environmental Engineering, University of Windsor, Windsor, ON N9B 3P4, Canada
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Author to whom correspondence should be addressed.
Academic Editor: Mahmoud Reda Taha
Fibers 2017, 5(1), 2; https://doi.org/10.3390/fib5010002
Received: 12 September 2016 / Revised: 10 November 2016 / Accepted: 18 December 2016 / Published: 6 January 2017
(This article belongs to the Special Issue Fiber Reinforced Polymers (FRP) for Infrastructure Applications)
The use of externally-bonded fiber-reinforced polymer (FRP) sheets has been successfully used in the repair and strengthening of both the shear and flexural capacities of reinforced concrete (RC) beams, slabs and columns since the 1990s. However, the externally-bonded FRP reinforcements still present many disadvantages, such as poor performance in elevated temperature and fire, lack of permeability and strength degradation when exposed to ultraviolet radiation. To remedy such drawbacks, the fiber-/fabric-reinforced cementitious matrix (FRCM) has been recently introduced. The FRCM system consists of a fiber mesh or grid embedded in a cementitious bonding material. The present research investigates the flexural strengthening of reinforced concrete (RC) beams with FRCM. The experimental testing included eight large-scale concrete beams, 150 mm × 250 mm × 2400 mm, internally reinforced with steel bars and strengthened in flexure with FRCM. The investigated parameters were the internal steel reinforcement ratio and the FRCM systems. Two steel reinforcement ratios of 0.18 and 0.36 of the balanced reinforcement ratio, as well as three FRCM systems using glass, carbon and PBO fibers were investigated. Test results are presented in terms of load-deflection, load-strain and load-crack width relationships. The test results indicated that the PBO FRCM significantly increased the ultimate capacity of the strengthened RC beams with both low and moderate internal reinforcement ratios compared to the glass and carbon FRCM. View Full-Text
Keywords: fiber-reinforced cementitious matrix (FRCM); textile-reinforced mortar; glass fiber; strengthening; reinforced concrete (RC) beam; polyparaphenylene benzobisoxazole (PBO); carbon fiber-reinforced cementitious matrix (FRCM); textile-reinforced mortar; glass fiber; strengthening; reinforced concrete (RC) beam; polyparaphenylene benzobisoxazole (PBO); carbon
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MDPI and ACS Style

Jabr, A.; El-Ragaby, A.; Ghrib, F. Effect of the Fiber Type and Axial Stiffness of FRCM on the Flexural Strengthening of RC Beams. Fibers 2017, 5, 2. https://doi.org/10.3390/fib5010002

AMA Style

Jabr A, El-Ragaby A, Ghrib F. Effect of the Fiber Type and Axial Stiffness of FRCM on the Flexural Strengthening of RC Beams. Fibers. 2017; 5(1):2. https://doi.org/10.3390/fib5010002

Chicago/Turabian Style

Jabr, Abdulla; El-Ragaby, Amr; Ghrib, Faouzi. 2017. "Effect of the Fiber Type and Axial Stiffness of FRCM on the Flexural Strengthening of RC Beams" Fibers 5, no. 1: 2. https://doi.org/10.3390/fib5010002

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