Location

London

Event Website

http://www.csce2016.ca/

Description

Externally bonded Fiber reinforced polymer (FRP) sheets made of fiber net embedded in epoxy matrix 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 90's. Although the epoxy gives the system most of its durability, it is also responsible for many disadvantages, such as poor performance in elevated temperature and fire, lack of permeability, as it traps moisture, and degradation when exposed to ultraviolet radiation. In order to avoid such drawbacks, composite material utilizing cement-based matrix called Fabric Reinforced Cementitious Matrix (FRCM) has been recently introduced. The FRCM system consists of fiber-reinforced composites in the form of meshes or grid embedded in a cementitious bonding material. This research investigated the flexure strengthening of reinforced concrete (RC) beams with glass-FRCM. The experimental study included characterization of the mechanical properties of GFRCM through axial tensile testing on 20 coupon specimens. Also, four large scale, 150 mm x 250 mm x 2400 mm, reinforced internally with steel bars had been constructed, strengthened in flexure with FRCM and tested under four-point bending. The investigated parameters included the internal steel reinforcement ratio. Test results showed that GFRCM did not affect the ultimate load capacity of the beams, however, the ultimate midspan deflection was increased. Debonding/Delamination of the FRCM was observed. Continuation of this research is going on, on which U-wrapped strips will be used to ensure no debonding of the FRCM from concrete substrate.


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Jun 1st, 12:00 AM Jun 4th, 12:00 AM

STR-962: FLEXURAL STRENGTHENING OF RC BEAMS USING GLASS-FRCM

London

Externally bonded Fiber reinforced polymer (FRP) sheets made of fiber net embedded in epoxy matrix 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 90's. Although the epoxy gives the system most of its durability, it is also responsible for many disadvantages, such as poor performance in elevated temperature and fire, lack of permeability, as it traps moisture, and degradation when exposed to ultraviolet radiation. In order to avoid such drawbacks, composite material utilizing cement-based matrix called Fabric Reinforced Cementitious Matrix (FRCM) has been recently introduced. The FRCM system consists of fiber-reinforced composites in the form of meshes or grid embedded in a cementitious bonding material. This research investigated the flexure strengthening of reinforced concrete (RC) beams with glass-FRCM. The experimental study included characterization of the mechanical properties of GFRCM through axial tensile testing on 20 coupon specimens. Also, four large scale, 150 mm x 250 mm x 2400 mm, reinforced internally with steel bars had been constructed, strengthened in flexure with FRCM and tested under four-point bending. The investigated parameters included the internal steel reinforcement ratio. Test results showed that GFRCM did not affect the ultimate load capacity of the beams, however, the ultimate midspan deflection was increased. Debonding/Delamination of the FRCM was observed. Continuation of this research is going on, on which U-wrapped strips will be used to ensure no debonding of the FRCM from concrete substrate.

http://ir.lib.uwo.ca/csce2016/London/Structural/99