Behavior of Anchored Carbon Fiber-Reinforced Polymer Strips Used for Strengthening Concrete Structures

2016 ◽  
Vol 113 (2) ◽  
Author(s):  
Wei Sun ◽  
James O. Jirsa ◽  
Wassim M. Ghannoum
Keyword(s):  
Carbon Fiber ◽  
Concrete Structures ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced

scholarly journals Flexural and Shear Strain Characteristics of Carbon Fiber Reinforced Polymer Composite Adhered to a Concrete Surface

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2596 ◽  
Author(s):  
Hisham Jahangir Qureshi ◽  
Muhammad Umair Saleem
Keyword(s):  
Carbon Fiber ◽  
Concrete Structures ◽  
Concrete Surface ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Shear Stresses ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced

The use of Fiber Reinforced Polymer (FRP) composites for strengthening concrete structures has gained a lot of popularity in the past couple of decades. The major issue in the retrofitting of concrete structures with FRP is the accurate evaluation of flexural and shear strains of polymer composites at the bonding interface of epoxy and concrete. To address it, a comprehensive experimental study was planned and carbon fiber reinforced polymer (CFRP) composite was applied on the concrete surface with the help of adhesives. CFRP was used as an external mounted flexural and shear reinforcement to strengthen the beams. Flexural load tests were performed on a group of eight reinforced concrete beams. These beams were strengthened in flexural and shear by different reinforcement ratios of CFRP. The strain gauges were applied on the surface of concrete and CFRP strips to assess the strain of both CFRP and concrete under flexural and shear stresses. The resulting test data is presented in the form of load–deformation and strain values. It was found that the values of strains transferred to the FRP through the concrete are highly dependent on the surface tensile properties of concrete and debonding strength of the adhesive. The test results clearly indicated that the strength increment in flexural members is highly dependent on strain values of the CFRP.

Debonding Strain Characteristics of Carbon Fiber Reinforced Polymer Composite Adhered to the Concrete Surface

2018 ◽  
Author(s):  
Hisham Jahangir Qureshi ◽  
Muhammad Umair Saleem
Keyword(s):  
Carbon Fiber ◽  
Concrete Structures ◽  
Concrete Surface ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Shear Stresses ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced

The use of Fiber Reinforced Polymer (FRP) composites for strengthening concrete structures has gained a lot of popularity in the past couple of decades. The major issue in the retrofitting of concrete structures with FRP is the accurate evaluation of debonding flexural strain of polymer composites at the bonding interface of epoxy and concrete. In order to address it, a comprehensive experimental study was planned and carbon fiber reinforced polymer (CFRP) composite was applied on the concrete surface with the help of adhesives. CFRP was used as an external mounted flexural and shear reinforcement to strengthen the beams. Flexural load test was performed on a group of eight reinforced concrete beams. These beams were strengthened in flexure and shear by different reinforcement ratios of CFRP. The strain gauges were applied on the surface of concrete and CFRP strips to assess the debonding strain of both CFRP and concrete under flexural and shear stresses. The resulting tests data is presented in the form of load –deformation and strain values. It has been found that the values of strains transferred to the FRP through the concrete are highly dependent on the surface tensile properties of concrete and debonding strength of the adhesive. The test results have clearly indicated that the strength increment in flexural members is highly dependent on debonding strain values of FRP from the concrete surface.

scholarly journals TECHNOLOGICAL-STRUCTURAL PECULIARITIES OF REINFORCED CONCRETE STRUCTURES STRENGTHENED WITH CARBON FIBER-REINFORCED POLYMER

2006 ◽  
Vol 12 (2) ◽  
pp. 77-83 ◽  
Author(s):  
Juozas Valivonis ◽  
Gediminas Marčiukaitis
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Concrete Structures ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Reinforced Concrete Structures ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Deformation Properties ◽  
Carbon Fiber Reinforced

Carbon fiber‐reinforced polymer is used for strengthening of reinforced concrete structures with externally bonded reinforcement. This fiber has more strength and better deformation properties than steel. During glueing, the glue is absorbed in the surface layer of concrete. It changes physical and mechanical properties of concrete. This effect depends on the structure of concrete. Experimental investigations sustained absorbing of glue and strengthening of concrete. The rigidity between concrete and carbon fiber polymer layer is smaller in cracked zones. Shear deformations decrease rigidity and strength in a contact zone. The authors methods were investigated in fastening carbon fiber‐reinforced polymer to concrete. The efficiency of these methods was definited. Theoretical results are compared with experimental results.

scholarly journals The Research of Blast Resistant of Reinforcement Concrete Beams in Concrete Structures at Off-site Oil and Gas Plant

CONSTRUCTION ◽  
2021 ◽  
Vol 1 (2) ◽  
pp. 85-92
Author(s):  
Salah Aljasmi ◽  
Nur Farhayu Ariffin ◽  
Mazlan Abu Seman
Keyword(s):  
Carbon Fiber ◽  
Oil And Gas ◽  
Concrete Beams ◽  
Concrete Structures ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Carbon Fiber Reinforced ◽  
Gas Plants

In the recent decades, blasts and gas explosions at the off-site of oil and gas plants have increased leading to destruction of important concrete structures, essential equipment and loss of human life. In response, structural engineers have come up with different ways of reinforcing beams of concrete structures using fiber reinforced polymers composite materials to produce blast resistant structures to minimize the impact of the blast loads, due to their unique and individual characteristics like high flexural and shear strength. This paper seeks to research the dynamic behavior, response and performance of reinforce concrete beams strengthened with Carbon Fiber Reinforced Polymer composites when subjected to blast loading. The study aims at proposing a design model of strengthening reinforce concrete beams with Carbon Fiber Reinforced Polymer in supporting concrete structures at off-site oil and gas plants against hydrocarbon explosions.  Carbon Fiber Reinforced Polymer composites exhibit higher modulus of elasticity, higher energy absorption capacity, resistant to all forms of alkali and higher tensile strength compared to all other fiber reinforced polymers reinforcements and therefore the need to assess its capacity in protecting concrete structures at oil and gas plants against dynamic loads. The research will be carried out through numerical analysis using the finite element analysis computer program, ANSYS.

Restoring Initially Cracked Reinforced Concrete Beams utilizing Carbon Fiber Reinforced Polymer Strips

2019 ◽  
Vol 7 (1) ◽  
pp. 30-34
Author(s):  
A. Ajwad ◽  
U. Ilyas ◽  
N. Khadim ◽  
Abdullah ◽  
M.U. Rashid ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Concrete Beams ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Loading Test ◽  
Control Beam ◽  
Reinforced Polymer ◽  
Cfrp Sheet ◽  
Carbon Fiber Reinforced

Carbon fiber reinforced polymer (CFRP) strips are widely used all over the globe as a repair and strengthening material for concrete elements. This paper looks at comparison of numerous methods to rehabilitate concrete beams with the use of CFRP sheet strips. This research work consists of 4 under-reinforced, properly cured RCC beams under two point loading test. One beam was loaded till failure, which was considered the control beam for comparison. Other 3 beams were load till the appearance of initial crack, which normally occurred at third-quarters of failure load and then repaired with different ratios and design of CFRP sheet strips. Afterwards, the repaired beams were loaded again till failure and the results were compared with control beam. Deflections and ultimate load were noted for all concrete beams. It was found out the use of CFRP sheet strips did increase the maximum load bearing capacity of cracked beams, although their behavior was more brittle as compared with control beam.

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