Pull-off testing as an interfacial bond strength assessment of CFRP-concrete interface exposed to a marine environment

Fazli, Hamed; Yassin, Airil Yasreen Mohd; Shafiq, Nasir; Teo, Wee

doi:10.1016/j.ijadhadh.2018.04.015

Cited by 24 publications

(10 citation statements)

References 11 publications

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“…Table 3 classifies the observed failure modes in this study, while Figure 6 shows a schematic of the test (the interface between the adhesive, the epoxy resin, the FRP layers, and the concrete is extended for limpidity). Failure took place at the feeblest plane within the system, which could have been the bond interface, the concrete substrate, the epoxy used to bond FRP to dolly, or a combination of these failure modes (Benzarti et al, 2011; Fazli et al, 2018; Green et al, 2000; Leone et al, 2009; Mikami et al, 2015). When a failure occurs at the adhesive material, it is considered to be the true bond strength.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…As a result, numerous investigations of the mechanical properties of bonding between FRP and concrete interface have been studied. Fazli et al (2018) studied the bond strength of the CFRP–concrete interface under full immersion in saltwater 3.5% at the temperature of 60°C and wet/dry cyclic exposure. The results indicated that 12 months of exposure in a marine environment had little effect on the bonding performance between CFRP and concrete.…”

Section: Introductionmentioning

confidence: 99%

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Experimental evaluation of the tensile bonding strength of the basalt fiber-reinforced polymer–concrete interface

Chhorn

Jung

2020

Advances in Structural Engineering

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The bonding performance of basalt fiber-reinforced polymer and concrete substrate has a significant effect on the reliability of externally strengthened existing concrete structure, due to being the most vulnerable element to failure in this fiber-reinforced polymer–concrete strengthening system. Its failure can result in the failure of the whole structure. Although many previous researchers have been interested in the tensile bonding strength of carbon fiber-reinforced polymer and glass fiber-reinforced polymer–concrete interface, that of basalt fiber-reinforced polymer–concrete interface has been very limited. Thus, the objective of this study is to experimentally assess the tensile bonding strength of the basalt fiber-reinforced polymer–concrete interface. The effects of high temperature, freezing–thawing cycles, type of resin, and concrete crack widths on the tensile bonding strength are also investigated. The pull-off experiment is conducted according to ASTM D7522/D7522M-15. A total of 205 core specimens of 50 mm diameter and 10 mm depth were taken from 41 concrete beams. The experimental results illustrate that both freezing–thawing and high-temperature condition have a substantial effect on the bonding strength of the basalt fiber-reinforced polymer–concrete interface. Bonding strength was decreased within the range of about 9%–30% when the number of freezing–thawing cycles increases from 100 to 300; likewise, it was decreased up to 30% when the exposure temperature rises to 200°C. Also, the specimens which were repaired to close their cracks by epoxy resin had no significant effect on the bonding strength of basalt fiber-reinforced polymer–concrete interface, when the specimens had crack width of less than 1.5 mm.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Experimental evaluation of the tensile bonding strength of the basalt fiber-reinforced polymer–concrete interface

Chhorn

Jung

2020

Advances in Structural Engineering

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“…The loss of the stress transfer mechanism due to the loss of bonding force is a manifestation of premature failure [ 14 ]. Fazli [ 15 ] conducted 162 groups of pull-off tests and analyzed the bond performance of concrete strengthened with carbon fiber reinforced plastics (CFRP) under the condition of wet/dry cyclic exposure and full-immersion exposure of 3.5% salt-water at a temperature of 60 °C. The results show that after 12 months of environmental exposure, the pull-out strength increased slightly.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Bond Performance of NC-UHPC Interfaces with Different Roughness and Substrate Strength

Zhang

Chen

et al. 2023

Materials

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This paper investigates the bond failure performance between precast normal concrete (NC) and cast-in situ ultra-high performance concrete (UHPC), emphasizing the influence of interfacial roughness. The interfacial bonding behavior under tension and under shear was investigated based on 72 groups of pull-off tests and 36 groups of bi-shear tests, considering six different interface treatment methods and two different NC strength levels. The results demonstrate that certain interfacial roughness is essential to gain a reliable bond connection between NC and UHPC. Its enhancement on the tensile bond performance could be described by the positive linear relationship between the mean roughness and the pull-off strength. However, further research is required to determine the characterization method of its influence on the shear bond performance. The higher strength of the base concrete is beneficial to the bond performance. Though this effect is evident in the pull-off tests under tension, the influence on the shear interfacial performance could be offset by that of the interface morphology in the case with high interfacial roughness.

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“…However, the adhesion of the respective coatings onto the concrete surface is a crucial property that also needs to be examined carefully. There are many factors that can be studied, in order to evaluate the performance of coatings and the protection of the concrete’s surface against corrosion/degradation problems, such as the adhesion ability [ 22 ], the thickness change [ 23 ], the surface characteristics [ 13 ], the concrete properties [ 24 ], the mass change [ 25 ], etc. In this study the factors selected to be examined are the adhesion properties of the coating, the water and acid resistance, the mineralogical changes, the change in roughness and hardness of the concrete substrate after acid spraying, and the surface characteristics of the coatings.…”

Section: Introductionmentioning

confidence: 99%

Properties and Performance of Novel Mg(OH)2-Based Coatings for Corrosion Mitigation in Concrete Sewer Pipes

et al. 2020

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The biological activity occurring in urban sewerage systems usually leads to the (biogenic) corrosion of pipe infrastructure. Anti-corrosion coating technology was developed in an effort to protect sewer pipes from degradation. This study evaluates a new class of relatively low-cost magnesium hydroxide-based coatings, regarding their ability to adhere efficiently onto the concrete surface, and offer efficient corrosion protection. Six magnesium hydroxide-based coatings were prepared with the addition of two different types of cellulose, used as adhesion additives, and these were applied on concrete specimens. Pull-off measurements showed that the addition of higher amounts of cellulose could improve the coating adhesion onto the concrete surface. An accelerated sulfuric acid spraying test was used to evaluate the consumption time of the applied coatings and their efficiency in maintaining over time slightly alkaline pH values (above 8) on the coated/protected surfaces. At the end of spraying test, a mineralogical analysis of surface samples was performed, indicating that the formation of corrosion by-products (mainly gypsum) was increased when the added amount of cellulose was lower. Hardness and roughness measurements were also conducted on the concrete surfaces, revealing that the coatings helped the concrete surface to preserve its initial surface properties, in comparison to the uncoated specimens. A SEM/microstructure analysis showed that aggregates were formed (possibly consisting of Mg(OH)2), affecting the reactivity of the protected surface against sulfuric acid attack.

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Pull-off testing as an interfacial bond strength assessment of CFRP-concrete interface exposed to a marine environment

Cited by 24 publications

References 11 publications

Experimental evaluation of the tensile bonding strength of the basalt fiber-reinforced polymer–concrete interface

Experimental evaluation of the tensile bonding strength of the basalt fiber-reinforced polymer–concrete interface

Experimental Study on Bond Performance of NC-UHPC Interfaces with Different Roughness and Substrate Strength

Properties and Performance of Novel Mg(OH)2-Based Coatings for Corrosion Mitigation in Concrete Sewer Pipes

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