Strengthening of Reinforced Concrete Structures with Carbon Reinforced Concrete—Possibilities and Challenges

Wagner, Juliane; Würgau, Carolin; Schumann, Alexander; Schütze, Elisabeth; Ehlig, Daniel; Nietner, Lutz; Curbach, Manfred

doi:10.3390/civileng3020024

Cited by 8 publications

(3 citation statements)

References 24 publications

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“…Furthermore, the high flexibility of CTR composite also allows for easier shaping and molding of complex structural geometries [15]. These positive effects not only enhance CTR's suitability for new construction projects but also for the repair of old buildings [16,17].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Beams Reinforced with Carbon 2D-Netzgitterträger Reinforcement

Ur Rehman,

Stümpel,

Michler

et al. 2023

Buildings

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The increasing popularity of carbon-reinforced concrete (CRC) is attributed to its exceptional tensile properties, low density, no corrosion phenomenon, and remarkable flexibility, allowing it to be easily shaped into various forms. However, there is a pressing need to explore this innovative and sustainable alternative to traditional steel reinforcement. This motivates research and investigation of the feasibility of using a special 2D Netzgitterträger (NetzGT) reinforcement system, featuring a net-shaped fabricated textile made of multiple diagonally offset rovings with overlapping edge strands, as a viable alternative to traditional steel reinforcement in concrete beams. This 2D NetzGT reinforcement system has also been transformed into a 3D configuration for the development of a hollow core slab system. It is manufactured from carbon rovings with three different diagonal angles of 50°, 60°, and 70°. Laboratory experiments were conducted to assess the mechanical behavior of beams reinforced with the 2D NetzGT reinforcement. Tensile tests on strands were also performed with an increasing number of overlapped rovings to analyze their tensile strength. Additionally, single yarn pull-out tests were also conducted to examine the influence of the roving angle on the bond strength between the carbon textile roving and the concrete matrix.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Beams Reinforced with Carbon 2D-Netzgitterträger Reinforcement

Ur Rehman,

Stümpel,

Michler

et al. 2023

Buildings

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show abstract

“…Carbon-reinforced concrete has emerged as a viable alternative to traditional steelreinforced concrete in various areas of the construction industry. Extensive research and practical projects have been conducted on the use of carbon grids for reinforcement in new construction and strengthening of existing structures [1][2][3][4][5]. However, the same level of knowledge and research does not exist for components reinforced with carbon rebars.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigations of the Bond Behavior between Carbon Rebars and Concrete in Germany

Schumann,

May,

May

et al. 2023

Buildings

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In this paper, we address the relatively underexplored topic of the bond behavior between various carbon rebars and high-strength concrete. This research aims to bridge the knowledge gap in understanding how different manufacturing processes and surface profiles of carbon fiber rods influence their bond strength with concrete. Through experimental bond tests comparing different carbon fiber rebars with varied surface profiles and manufacturing methods, we observed that the achievable bond stresses are significantly influenced by these factors. One carbon rebar variant was selected based on preliminary investigations for detailed analysis. Extensive investigations were conducted on the preferred carbon rebar. Factors such as concrete strength, bond length, and testing speed were experimentally explored. The results not only corroborate many findings from traditional reinforced concrete construction but also reveal new phenomena unique to carbon rebars. These insights are crucial for advancing the application of carbon rebars in modern construction, offering a potential solution to challenges faced in conventional concrete construction.

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“…For this reason, it seems clear that we should not focus only on simple fixes. Instead, we should look for ways to make these structures stronger through reinforcement, which can also be used to make reinforced concrete structures last longer (Wagner et al, 2022;Siddika et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Concrete reinforcement using composite fiberglass-based materials

Lamine,

Mohamed,

Rachid

2023

J. Eng. Exact Sci.

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Numerous existing structures, both old and new, have serious load-bearing capacity issues, which, in some cases, could endanger the safety of their users. In fact, we can say that these structures are nearing (or have already reached) the end of their useful lives, necessitating the need to find technical and financial solutions to renovate them as efficiently as possible. Many reinforced concrete bridges experience advanced states of deterioration as a result of extended exposure to hostile environments or even continuously rising use loads. Additionally, since the time of their construction, the technical standards used for the design and dimensioning of the old structures have had to be updated. As a result, some structural components that are still in use do not adhere to the standards for response to loads. In fact, it is frequently less expensive to reinforce the structural components of buildings than to perform a full reconstruction, especially now that, thanks to technological advancements, a variety of reinforcement techniques are still available and their costs are decreasing. One such technique involves externally reinforcing reinforced concrete elements with composite materials because of their superior strength-to-weight ratio and resistance to abrasion. Additionally, these composite materials can be utilized for column containment as well as shear and bending reinforcement for beams. This study aims to evaluate the impact of glass fibers on the general behavior of concrete, in particular on its resistance, deformations, and ductility, using FRP: Fiber-reinforced plastics are materials generally formed of two main and distinct elements: the fiber, "made from glass," and the matrix, "an epoxy resin that allows the transfer of loads between the fibers. The results of the specimens' cyclic loading tests attest to the significance of the contribution that concrete specimen confinement with FRP can make in terms of deformation and resistance to compression after the completion of static loading tests. However, these tests on the specimens' ability to withstand loading and unloading cycles reveal a very significant improvement.

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Strengthening of Reinforced Concrete Structures with Carbon Reinforced Concrete—Possibilities and Challenges

Cited by 8 publications

References 24 publications

Experimental Investigation of Beams Reinforced with Carbon 2D-Netzgitterträger Reinforcement

Experimental Investigation of Beams Reinforced with Carbon 2D-Netzgitterträger Reinforcement

Experimental Investigations of the Bond Behavior between Carbon Rebars and Concrete in Germany

Concrete reinforcement using composite fiberglass-based materials

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