Environmental Effects on the Short-Term Bond of Carbon Fiber-Reinforced Polymer (CFRP) Composites

Malvar, L. J.; Joshi, Narayan R.; Beran, J.; Novinson, Tom

doi:10.1061/(asce)1090-0268(2003)7:1(58)

Cited by 28 publications

(12 citation statements)

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“…Malvar et al (2003) found that the combination of high humidity and high temperature had a large impact on the bond strength as measured by pull-off tests. Maximum relative humidity during adhesive application was recommended to be 85%, which was later confirmed by research done by Myers and Ekenel (2005).…”

Section: Synergistic Effectsmentioning

confidence: 98%

Environmental Durability of Reinforced Concrete Deck Girders Strengthened for Shear with Surface Bonded Carbon Fiber-Reinforced Polymer

Higgins¹,

Dawson²,

Mitchell³

et al. 2009

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Sponsoring Agency Code Supplementary Notes AbstractThis research investigated the durability of carbon fiber-reinforced polymer composites (CFRP) used for shear strengthening reinforced concrete deck girders. Large beams were used to avoid accounting for size effects in the data analysis. The effort included determining the role of freeze-thaw, moisture, and fatigue on structural performance and developing analytical design procedures that account for durability.The results showed that moisture infiltration behind the CFRP, combined with freeze-thaw, was critical in reducing shear panel stiffness and shear capacity. Long-term moisture exposure alone produced only a minor decrease in shear capacity. Freeze-thaw, combined with fatigue, had little effect on shear capacity if water infiltration was minimized. Fatigue caused some debonding, but the debonding was not significant enough to affect capacity.Use of ACI-318 with ACI 440 provided conservative predicted shear strengths after environmental exposure. However, the ACI approach did not provide uniform levels of safety because the observed conservatism was built into the prediction for the unstrengthened base specimens but not for the CFRP contribution. Consequently, a recommendation of the research is to apply the environmental exposure factor at the final design step to limit the effective CFRP stress/strain. For locations with very large numbers of wet freeze-thaw cycles and extended exposure to continuous moisture, the environmental reduction factors should be reduced even further. To better predict the CFRP bond strength demands that can occur due to shear-moment interaction, a further check of the design should be made beyond those required by ACI-440.17.

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Section: Synergistic Effectsmentioning

confidence: 98%

Environmental Durability of Reinforced Concrete Deck Girders Strengthened for Shear with Surface Bonded Carbon Fiber-Reinforced Polymer

Higgins¹,

Dawson²,

Mitchell³

et al. 2009

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“…Loizos and Papavasiliou (2006) [8] performed a comprehensive monitoring and data analysis research study by using Falling Weight deflectometer (FWD) for in situ evaluation of recycled pavements. Proverbio and Venturi (2005) [11] used pull off tests to evaluate effects of temperature, moisture, and chloride content on CFRP adhesion. Pascale et al (2003) [12] carried out an experimental program involving both destructive and nondestructive methods applied to different concrete mixtures, with cube strength varying from 30 to 150 MPa, to define a relation between strength and parameters.…”

Section: Brief Literature Reviewmentioning

confidence: 99%

“…[9] evaluated the reliability of rebound hammer test and UPV test on concrete of different composition and strength Rens et al (2005). [10] explained application of NDE methods for bridge inspection, which is Bridge Evaluation Using NDT (BENT) Malavar et al (2003). …”

mentioning

confidence: 99%

Review of Nondestructive Testing Methods for Condition Monitoring of Concrete Structures

Verma

Bhadauria²,

Akhtar

2013

Journal of Construction Engineering

135

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The deterioration of concrete structures in the last few decades calls for effective methods for condition evaluation and maintenance. This resulted in development of several nondestructive testing (NDT) techniques for monitoring civil infrastructures. NDT methods have been used for more than three decades for monitoring concrete structures; now it has been recognized that NDT plays an important role in the condition monitoring of existing RC structures. NDT methods are known to be better to assess and evaluate the condition of RC structures practically. This paper reviewed several available NDT methods developed and used in the last few decades.

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“…Malvar et al [12] evaluated the effect of moisture and chloride content on the CFRP bond to concrete using the pull-off test. Square concrete pile exposed to the saltwater and marine conditions for 48 months were strengthened with CFRP.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of external FRP-concrete bond in repaired concrete bridge girders and columns

Pallempati

Beneberu

Yazdani

2016

Innov. Infrastruct. Solut.

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Fiber reinforced polymer (FRP) is increasingly used to strengthen damaged or structurally unsafe concrete bridges. The FRP wrapping on eight concrete bridges was evaluated with ASTM pull-off testing to assess the condition of the bonding. A majority of samples failed in the concrete substrate. However, large variations in failure modes and pull-off strengths were observed, possibly due to environmental degradation or improper application. A majority of samples failed in the ASTM Mode G in concrete. Average bond strength from columns samples was 20 % lower than that from girders, due to the difficulty of pull-off testing on round column surfaces.

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Environmental Effects on the Short-Term Bond of Carbon Fiber-Reinforced Polymer (CFRP) Composites

Cited by 28 publications

References 1 publication

Environmental Durability of Reinforced Concrete Deck Girders Strengthened for Shear with Surface Bonded Carbon Fiber-Reinforced Polymer

Environmental Durability of Reinforced Concrete Deck Girders Strengthened for Shear with Surface Bonded Carbon Fiber-Reinforced Polymer

Review of Nondestructive Testing Methods for Condition Monitoring of Concrete Structures

Evaluation of external FRP-concrete bond in repaired concrete bridge girders and columns

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