Utilization of CFRP for strengthening RC columns in marine environment

Alsaad, Alaa; Hassan, Gulan Bapeer

doi:10.1016/j.cscm.2017.05.002

Cited by 8 publications

(4 citation statements)

References 13 publications

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“…Previous studies suggested that in steel-jacketing concrete, the axial strain ε cc achieved at the corresponding compressive strength can be directly associated with the confining pressure of FRP [63]. The expression can be written as ε cc = ε co 1 + k 2 f l f co (9) where ε cc symbolizes peak strain of the jacketed concrete specimens corresponding to the peak strength f cc , ε co denotes the strain of unconfined concrete, and k 2 is the experimentally determined confinement coefficient. Richart et al [63] proposed the value of k 2 equal to 5k 1 for concrete jacketed by steel reinforcement.…”

Section: Existing Strain Modelsmentioning

confidence: 99%

“…Many experimental studies reported that external wrapping by FRP composite could remarkably increase the load-carrying ability of circular, square, and rectangular concrete columns [5][6][7]. Different types of FRPs have been used for the lateral confinement of concrete columns, which includes carbon [8][9][10][11][12][13][14], glass [7,[15][16][17][18], aramid [6,[19][20][21], polyethylene napthalate (PEN) [22,23], polyethylene terephthalate (PET) [22][23][24][25][26], and basalt [27][28][29]. These FRP composites are effectively used in enhancing the load-bearing capacity and energy absorption of masonry and reinforced concrete infrastructures.…”

Section: Introductionmentioning

confidence: 99%

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Performance of Concrete Confined with a Jute–Polyester Hybrid Fiber Reinforced Polymer Composite: A Novel Strengthening Technique

Wahab

Srinophakun

Hussain³

et al. 2019

Fibers

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The strengthening and rehabilitation of concrete members is an important issue which arises worldwide. Carbon, aramid and glass fiber reinforced polymer (FRP) composites are mainly used for strengthening and rehabilitation. However, its use is limited on a small scale because of its high price, lack of availability and environmental impacts. The solution of this issue gives rise to the use of locally available natural fibers and low-cost synthetic fibers. This paper presents the experimental and analytical results of circular and square concrete columns confined with jute-polyester hybrid FRP composites. The main objective of this study is to evaluate the viability and performance of concrete confined with the hybridization of jute and polyester (FRP) composite sheets to utilize its superior properties. A novel hybrid technique has been applied for the wrapping of fiber sheets. The fiber sheets were applied in such a way that a uniform bond between the inner and outer layer was achieved. A total of 32 plain, standard size circular and square concrete specimens, externally wrapped with a jute-polyester FRP (JPFRP) composite, were tested under monotonic axial compressive loads. The result shows that JPFRP confinement increased the strength, strain and ductility index ranged between 1.24 and 2.61, 1.38 and 8.97, and 4.94 and 26.5 times the un-jacketed specimen, respectively. Furthermore, the wrapping has a significant effect on the low-strength specimens, having a circular cross-section. For high strength specimens, the post-peak stress-strain behavior was dominated by the outer polyester jacket because of its large rupture strain. Additionally, the test results were used to evaluate the existing strength-strain models derived for conventional FRPs. The models predicted values either underestimating or overestimating the compressive strength and strain of JPFRP-confined specimens. However, the strength models performed better than the strain models. The JPFRP wrapping significantly enhanced the strength, fracture energy, ductility index, and post-peak response. Therefore, JPFRP confinement can be used for a small-scale application, where little strength and high ductility is demanded. Moreover, it can be used to prevent the peeling of the concrete cover and moisture penetration into the concrete.

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Section: Existing Strain Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Performance of Concrete Confined with a Jute–Polyester Hybrid Fiber Reinforced Polymer Composite: A Novel Strengthening Technique

Wahab

Srinophakun

Hussain³

et al. 2019

Fibers

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show abstract

“…Previous reports considering the durability of CFRP in complex environments such as crude oil and seawater found that the ultimate bearing capacity of an RC (Reinforced Concrete) column bonded with CFRP was unaffected, the displacement decreased by 37% and 53%, and the ductility gradually decreased between 1000 h and 1500 h, respectively [19,20]. Moreover, direct pull-out tests, which indicate that CFRP bars are embedded in concrete, showed a decrease of 12% in the ultimate bearing capacity caused by wet-dry cycles, with similar characteristic results for the "fish-spine" crack pattern.…”

Section: Introductionmentioning

confidence: 99%

Ultimate Bearing Capacity Analysis of CFRP-Strengthened Shield Segments Using Bonding Slip Behavior Experiments

Nie

2020

Materials

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Shield segments of subway tunnels are often exposed to the combined actions of several hygrothermal factors that could lead to accidents such as water seepage and tunnel collapse. Further, they often break and deform owing to formation pressure. In addition, uncertainties related to the stress relaxation characteristics and bonding performance of carbon-fiber-reinforced plastics (CFRPs) under a hygrothermal environment make their application in subway systems difficult. This study analyzes the effects of the slip-on-bending strength of CFRP-strengthened shield segments in a hygrothermal environment. In the study, the shield segments are damaged at ambient pressure under a combination of humidity (0%, 5%, and 10%) and temperature (20 °C, 25 °C, 30 °C, and 40 °C). An experimental procedure is designed to evaluate a CFRP-reinforced concrete arch. The method predicts the load–slip relationship and maximum shearing stress and strain. Moreover, confined compression tests are conducted on a tunnel segment lining strengthened with CFRP to evaluate the bearing capacity of the CFRP-strengthened shield segments. An equation for the latter’s ultimate bearing capacity is developed based on the elastic layer system theory, stress boundary condition, and bending stress characteristics of axisymmetric elements. It was found that the results from the developed model are compared with the experimental values of CFRP-strengthened shield segments under different humidity values (0%, 5%, and 10%) and a constant temperature. The ultimate strength—the debonding deflection of the CFRP-strengthened shield segment—can be predicted using the proposed ultimate bearing capacity equation with sufficient accuracy.

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“…Zuo et al 65 found that after being exposed to seawater, the bearing capacity of the CFRP‐strengthened reinforced concrete beam first decreased slightly and then stabilized. Alssad et al 66 found the bearing capacity of CFRP‐ strengthened reinforced concrete columns in the marine environment is less affected by the exposure time, while its ductility is more affected. Kashi et al 67 used FRP to strengthen damaged concrete columns in the marine environment, and found the corrosion resistance of damaged reinforced concrete columns had effectively improved after being strengthened with FRP.…”

Section: Introductionmentioning

confidence: 99%

Effect of chloride penetration on CFRP sheet, CFRP‐concrete interface, and CFRP‐strengthened concrete beams

Wang

Han

Wang

et al. 2023

Structural Concrete

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Whether the performance of carbon fiber‐reinforced polymer (CFRP)‐strengthened concrete structure is affected by chloride penetration is the key to the application under chloride environments. In this paper, the effect of chloride penetration on tensile properties of CFRP sheet, bond behavior of CFRP‐concrete, and flexural performance of CFRP‐strengthened concrete beams were studied. Results show that chloride penetration has no effect on the elastic modulus of the CFRP sheet. The tensile strength and elongation of the CFRP sheet decrease with the exposure time increase, reducing by 10% and 12.7% after 240 days. The interface failure of CFRP‐concrete is likely to occur on the concrete surface. As the exposure time increases, the interface failure develops toward the epoxy resin layer; the sliding stiffness and end slip of the interface decrease. However, the ultimate bearing capacity of the interface first increases and then decreases. As the exposure time increase, the effective bonding length gradually increases, and the failure mode of CFRP‐strengthened beams changes from bending failure to shear failure. After 120 days, the ultimate bearing capacity of the beams is significantly reduced. From three parts of materials, interfaces, and components to provide an evaluation basis for the use, regular detection, and life prediction of CFRP‐strengthened reinforced concrete beams under chloride environments.

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Utilization of CFRP for strengthening RC columns in marine environment

Cited by 8 publications

References 13 publications

Performance of Concrete Confined with a Jute–Polyester Hybrid Fiber Reinforced Polymer Composite: A Novel Strengthening Technique

Performance of Concrete Confined with a Jute–Polyester Hybrid Fiber Reinforced Polymer Composite: A Novel Strengthening Technique

Ultimate Bearing Capacity Analysis of CFRP-Strengthened Shield Segments Using Bonding Slip Behavior Experiments

Effect of chloride penetration on CFRP sheet, CFRP‐concrete interface, and CFRP‐strengthened concrete beams

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