Bond Behavior between NSM CFRP Strips and Concrete Exposed to Elevated Temperature Using Cement-Based and Epoxy Adhesives

Jadooe, Awad; Al-Mahaidi, Riadh; Abdouka, Kamiran

doi:10.1061/(asce)cc.1943-5614.0000812

Cited by 25 publications

(5 citation statements)

References 12 publications

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“…Other group of researchers conducted experimental investigations [50,51] on concrete that damaged by high temperatures and then strengthened with CFRP laminate using NSM technique and two types of bonding adhesives. The high temperatures were 200,400, and 600°C for different exposure periods (1 and 2 hrs) and then CFRP was applied.…”

Section: Nsm Frp Strengthening Systemmentioning

confidence: 99%

A Review on Bond Performance of FRP-Concrete System at Various Environmental Conditions

Al-Safy¹

2022

jeasd

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Strengthening concrete structures with Fibre Reinforced Polymer (FRP) is one of the most commonly used technique to repair and rehabilitate concrete members due to the advanced properties of FRP over other conventional materials such as steel plates. The required performance of FRP-concrete system is linked to achieve proper bond between FRP and concrete substrates that as exposed to different environmental conditions. In the current paper, a review is conducted to highlight the most reported work by other researchers regarding the bond behavior of concrete members that strengthened with FRP in shear-tension and exposed to temperature-based conditions and compared with ambient conditions. The current review focused on the conducted work on FRP/concrete system that strengthened with two different installation techniques (externally bonding (ES) and near–Surface mounted (NSM)) using two different bonding agents (epoxy-based adhesive (EBA) and cement-based adhesive (CBA)) with and without modification. The adoption of two specific bond test procedures (adhesion and single lap shear tests) at ambient conditions and temperature-based conditions was also reviewed intensively to clarify the advantages and drawbacks associated with each test. Some reported findings by others in conducting bond test methods for different FRP/concrete systems were highlighted as well to address the gap in knowledge and the need for further research in this regard.

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Section: Nsm Frp Strengthening Systemmentioning

confidence: 99%

A Review on Bond Performance of FRP-Concrete System at Various Environmental Conditions

Al-Safy¹

2022

jeasd

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“…It is widely known that environmental factors have an influence on the efficiency of concrete reinforced using the FRP technique [34]. Furthermore, exposure of concrete reinforced with epoxy resin or cement-based adhesive in a high temperature leads to a decrease of strength of reinforced concrete structures with composites [35]. The motivation to address this topic was the lack of research showing the use of CF sheets in the structure of SCHPFRC.…”

Section: Research Significancementioning

confidence: 99%

Does the Carbon Fibre Coating Reinforcement Have an Influence on the Bearing Capacity of High-Performance Self-Compacting Fibre-Reinforced Concrete?

Ostrowski

2019

Materials

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This study investigated the impact of the location of a carbon fibre coated reinforcement ring (CFCRr) inside the structure of high-performance self-compacting fibre-reinforced concrete (HPSCFRC). Nowadays, cement matrix is considered as an alternative binder when reinforcing concrete structures with composite materials. Due to the plastic behavior of composite structures at relatively low temperatures when carbon fibres are reinforced with epoxy resin, the author attempted to locate carbon fibres inside a concrete structure. Thanks to this, the reinforcement will be less vulnerable to high temperatures (during a fire) and more compatible with concrete. The fibres act as a perimeter reinforcement that is compatible with the concrete mixture. The position of the CFCRr in the structure of concrete has an influence on the load capacity, stiffness and stress-strain behavior of concrete elements. The research was conducted on circular shape short concrete columns and tested under axial compression. The results demonstrated that by including CFCRr inside a concrete specimen, the maximum compressive strength decreases with an increase in the number of composite rings and a greater distance from the vertical axis of symmetry to the edge of the element. It has been proven in these studies that carbon fibres do not have good adhesive properties between CFCRr and a concrete mixture. As a result of this phenomenon, a shear surface is created, which leads to crack propagation along the CFCRr. Therefore, the presented idea of an internal CFCRr should not be used when designing new concrete structures.

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“…The effect of extreme temperature (over 200 • C) on concrete prisms with attached CFRP using epoxy adhesive was investigated. The epoxy adhesive bond strength decreased gradually as the temperature increased [10]. The thermal cycles in the air increased the interfacial fracture energy of the CFRP-concrete whereas the interfacial fracture energy was reduced due to the thermal cycles in water.…”

Section: Introductionmentioning

confidence: 97%

“…Previous studies examined the effect of exposure to different environmental conditions on the fabric attached to concrete using an epoxy adhesive or cement-based adhesive [8][9][10][11][12]. The degradation of the bond between the CFRP and concrete was attributed to the deterioration of the concrete surface [9].…”

Section: Introductionmentioning

confidence: 99%

Environmental Impact on the Behavior of CFRP Sheet Attached to Concrete

Al-Khafaji¹,

El‐Zohairy

Mustafic

et al. 2022

Buildings

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Carbon fiber-reinforced polymer (CFRP) has many advantages as a construction/structural-strengthening material. However, there are still concerns regarding the long-term performance of these materials when used with reinforced concrete (RC) structures. Environmental conditions have an adverse effect on the behavior of CFRP and the bond between these sheets and concrete. Therefore, the durability of CFRP used for strengthening RC beams was evaluated under different environmental scenarios, including subjection to immersion in deicing agents, tap water, and saltwater, freeze-and-thaw cycles, and outdoor environmental changes. Laboratory tests were performed to examine the influence of these environmental scenarios on the bonding behavior between CFRP sheets and concrete in terms of deformations and modes of failure. Two types of test setups were performed in this study, namely pull-off shearing and three-point bending. Forty-two concrete prisms with CFRP were prepared and tested by using the pull-off shearing setup. It was observed that as the period of exposure increased, noticeable effects on the CFRP sheet as well as the bond stiffness were observed. Exposure to tap water had a greater impact than saltwater on the CFRP–concrete bond strength as well as the CFRP. In addition, eighteen notched concrete beams strengthened with an external CFRP were tested under three-point bending. The tap water exposure showed a 3.6% increase in the bond strength compared to the control specimen. However, the saltwater exposure showed a 10% increase.

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Bond Behavior between NSM CFRP Strips and Concrete Exposed to Elevated Temperature Using Cement-Based and Epoxy Adhesives

Cited by 25 publications

References 12 publications

A Review on Bond Performance of FRP-Concrete System at Various Environmental Conditions

A Review on Bond Performance of FRP-Concrete System at Various Environmental Conditions

Does the Carbon Fibre Coating Reinforcement Have an Influence on the Bearing Capacity of High-Performance Self-Compacting Fibre-Reinforced Concrete?

Environmental Impact on the Behavior of CFRP Sheet Attached to Concrete

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