Behavior of concrete confined with epoxy bonded fiber ropes under axial load

Hussain, Qudeer; Ruangrassamee, Anat; Tangtermsirikul, Somnuk; Joyklad, Panuwat

doi:10.1016/j.conbuildmat.2020.120093

Cited by 39 publications

(32 citation statements)

References 43 publications

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“…In Figure 7, a bilinear (Case-1) response is observed for hemp FRRP-confined square specimens. In past studies, this behavior was observed for natural and synthetic FRP-confined circular sections [43,54]. The ascending bilinear behavior of hemp FRRP-confined specimens could be related to the higher stiffness and linear stress versus strain relationships of the hemp FRRP composite, as shown in Figure 3.…”

Section: Effects Of Fiber Rope Typesmentioning

confidence: 60%

“…A special mechanical system was used for dry wrapping fiber ropes circumferentially around the specimens throughout the height, as shown in Figure 4 [43]. First, dry fiber ropes were wrapped around square specimens (Figure 4b).…”

Section: Strengthening Of Concrete Specimensmentioning

confidence: 99%

“…Research efforts on the practice of polypropylene fibers, tapes, and un-bonded steel wires have shown that these materials are considerably useful for repair and strengthening purposes [40][41][42]. Hussain et al (2020) recently developed a novel technique for strengthening concrete structures by confining them with fiber rope reinforced polymer (FRRP) composites [43]. In this technique, fiber ropes (non-impregnated) are attached to the concrete columns manually or by any suitable method with some pre-tension.…”

Section: Introductionmentioning

confidence: 99%

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Low-Cost Fiber Rope Reinforced Polymer (FRRP) Confinement of Square Columns with Different Corner Radii

et al. 2021

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This research investigates the behavior of square concrete columns externally wrapped by low-cost and easily available fiber rope reinforced polymer (FRRP) composites. This study mainly aims to explore the axial stress-strain relationships of FRRP-confined square columns. Another objective is to assess suitable predictive models for the ultimate strength and strain of FRRP-confined square columns. A total of 60 square concrete columns were cast, strengthened, and tested under compression. The parameters were the corner radii of square columns (0, 13, and 26 mm) and different materials of FRRP composites (polyester, hemp, and cotton FRRP composites). The strength and deformability of FRRP-confined specimens were observed to be higher than the unconfined specimens. It was observed that strength gains of FRRP-confined concrete columns and corner radii were directly proportional. The accuracy of ultimate strength and strain models developed for synthetic FRRP-confined square columns was assessed using the test results of this study, showing the need for the development of improved predictive models for FRRP-confined square columns. Newly developed unified models were found to be accurate in predicting the ultimate strength and strain of FRRP-confined columns.

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Section: Effects Of Fiber Rope Typesmentioning

confidence: 60%

Section: Strengthening Of Concrete Specimensmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Low-Cost Fiber Rope Reinforced Polymer (FRRP) Confinement of Square Columns with Different Corner Radii

et al. 2021

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“…For moisture absorption studies, square samples were prepared by using the industrial silicon mold. Meanwhile, tensile specimens single lap joint specimens for tensile shear test were prepared according to the standard ASTM E8 [ 23 ] and ASTM D1002, respectively. At least five samples of each moisture, tensile and single lap joint specimens were prepared for each condition to obtain sufficient reliability of the results.…”

Section: Methodsmentioning

confidence: 99%

Moisture Absorption Behavior and Adhesion Properties of GNP/Epoxy Nanocomposite Adhesives

2021

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In the current work, an attempt has been made to investigate the effect of Graphene Nanoplatelets (GNP) reinforcement to water absorption behavior and mechanical properties of adhesive bonding with epoxy. Epoxy adhesive with various GNP content (i.e., 0.0~2.0 wt%) was utilized to joint aluminum adherend subjected to various immersion periods (i.e., 0~60 days). Subsequently, the effect of GNP reinforcement on water uptake, water absorption rate and tensile shear strength was investigated. Depending on GNP content, two distinct behaviors in water uptake and moisture absorption rate have been observed; specimens with lower GNP content (0.5~1.0 wt%) have demonstrated increased/retention of water uptake and water absorption rate regardless of immersion period. Meanwhile, at higher GNP content (1.5~2.0 wt%), decreased water uptake and water absorption rate are generally observed. At similar GNP content, regardless of immersion periods, water immersed specimens generally demonstrate higher or retention of shear strength when compared to specimens at 0-day immersion period. These observations suggest that the relation between moisture absorption behavior and mechanical properties of GNP-reinforced adhesive with GNP content are rather complex which might be attributed to the interplay of several possible mechanisms.

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“…Structural strengthening and the upgradation or repairing of reinforced structures (RC) with different materials have evolved over the years and have become a complex science. This science of strengthening involves the use of different conventional cement-based materials, concrete jacketing [ 3 , 4 , 5 ], steel jacketing [ 6 , 7 , 8 , 9 ], as well as the use of new composite materials [ 10 , 11 , 12 , 13 , 14 ]. Regardless of the experience and experiments, the knowledge gained over the years dictates that concrete deteriorates due to natural causes and different manmade errors.…”

Section: Introductionmentioning

confidence: 99%

Flexural Behavior of Natural Hybrid FRP-Strengthened RC Beams and Strain Measurements Using BOTDA

et al. 2021

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Experimental and finite element analysis results of reinforced concrete beams under monotonic loading were presented in this study. In the experimental program, one beam was tested in an as-built condition. The other two beams were strengthened using natural hybrid FRP layers in different configurations. The natural hybrid FRP composite was developed by using natural jute FRP and basalt FRP. One of the most appealing advantages of natural fiber is its beneficial impact on the environment, which is necessary for the sustainability recognition as an alternative to synthetic FRP. The hybrid FRP was applied to the bottom concrete surface in one beam, while a U-shaped strengthening pattern was adopted for the other beam. The flexural behavior of each beam was assessed through strain measurements. Each beam was incorporated with conventional strain gages, as well as the Brillouin Optical Time Domain Analysis (BOTDA) technique. BOTDA has its exclusive advantages due to its simple system architecture, easy implementation, measurement speed, and cross-sensitivity. The experimental results revealed that the beam strengthened with the U-shaped hybrid FRP composite pattern had a better flexural response than the other counterpart beams did both in terms of peak loads and maximum bottom longitudinal steel bar strains. Beams B-01 and B-02 exhibited 20.5% and 28.4% higher energy dissipation capacities than the control beam did, respectively. The ultimate failure of the control beam was mainly due to the flexural cracks at very low loads, whereas the ultimate failure mode of FRP composite-strengthened beams was due to the rupture of the hybrid FRP composite. Further, strain measurements using BOTDA exhibited similar patterns as conventional strain gage measurements did. However, it was concluded that BOTDA measurements were substantially influenced by the bottom flexural cracks, ultimately resulting in shorter strain records than those of conventional strain gages. Nonlinear structural analysis of the beams was performed using the computer program ATENA. The analytical results for the control beam specimen showed a close match with the corresponding experimental results mainly in terms of maximum deflection. However, the analytical peak load was slightly higher than the corresponding experimental value.

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Behavior of concrete confined with epoxy bonded fiber ropes under axial load

Cited by 39 publications

References 43 publications

Low-Cost Fiber Rope Reinforced Polymer (FRRP) Confinement of Square Columns with Different Corner Radii

Low-Cost Fiber Rope Reinforced Polymer (FRRP) Confinement of Square Columns with Different Corner Radii

Moisture Absorption Behavior and Adhesion Properties of GNP/Epoxy Nanocomposite Adhesives

Flexural Behavior of Natural Hybrid FRP-Strengthened RC Beams and Strain Measurements Using BOTDA

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