Subcritical debonding of FRP-to-concrete bonded interface under synergistic effect of load, moisture, and temperature

Amidi, Shahrooz; Wang, Jialai

doi:10.1016/j.mechmat.2015.09.001

Cited by 35 publications

(17 citation statements)

References 28 publications

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“…The FRP-to-concrete interface specimen consists of a layer of CFRP pre-cured plate, a layer of epoxy adhesive and a concrete block, as shown in Fig.1. The same method used in our previous study was adopted to manufacture the specimen and treat the surface of the concrete blocks [15]. The bonding surfaces of the concrete blocks were sandblasted for about 5 minutes to provide rough surfaces for better bonding between the concrete and the epoxy.…”

Section: Specimensmentioning

confidence: 99%

“…Our previous study [15] has shown that significant swelling of the epoxy can be induced by water absorption, which can introduce localized stresses along the epoxyconcrete interface. Swelling of the epoxy can also be observed from the water absorption test shown in Figs.…”

Section: Relationship Between the Fracture Toughness And I Rhmentioning

confidence: 99%

“…This technique has the minimal impact on the surrounding environment and is far easier and faster to be implemented compared to other enhancement techniques. Extensive studies have been conducted on the durability of FRP strengthened reinforced concrete structures [8][9][10][11][12][13][14][15]. These study suggest that the durability of the FRP-to-concrete interface plays a critical role in the durability of the FRP strengthened structures [8].…”

Section: Introductionmentioning

confidence: 99%

“…The durability of the FRP-to-concrete interface in aggressive environments is mainly examined through experimental studies [12][13][14][15][17][18][19][20][21][22][23][24][25][26][27][28]. Two important conclusions can be draw from these studies.…”

Section: Introductionmentioning

confidence: 99%

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Deterioration of the FRP-to-concrete interface subject to moisture ingress: Effects of conditioning methods and silane treatment

Amidi

Wang

2016

Composite Structures

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Please cite this article as: Amidi, S., Wang, J., Deterioration of the FRP-to-concrete interface subject to moisture ingress: effects of conditioning methods and silane treatment, Composite Structures (2016), doi: http://dx. AbstractFiber reinforced plastics (FRP) composites have emerged as one popular material in retrofit/rehabilitation of concrete structural members in last decades. The long-term durability of the FRP-to-concrete interface in aggressive environments plays a critical role in the success of this technique. An experimental program has been carried out in this study to examine the effect of moisture on the deterioration of the FRP-to-concrete interface. In addition to condition the specimens through fully submerging the specimens in water, a new method to condition the specimen through submerging only the bottom half of the specimen in water was used in this study. Testing results suggest that the fracture toughness of the FRP-to-concrete interface conditioned through half immersion is significantly higher than that of the interface conditioned through full immersion. Three possible responsible mechanisms have been identified: different moisture distributions along the epoxy-concrete interface induced by conditioning methods; faster moisture diffusion through the epoxy-concrete interface, and hygroscopic swelling stress induced by the swelling of the epoxy after absorbing moisture. The significant effect of the conditioning method on the durability of the FRP-to-concrete interface makes us postulate that the laboratory testing method based on full immersion of the specimen in water could exaggerate the deterioration of the interface induced by the moisture in real applications, in which the 1 Corresponding author. Tel.: +1 205 348 6786; fax: +1 205 348 0783. Email address: jwang@eng.ua.edu (J.Wang) 2 interface is exposed to air, rather than water. In such a case, neither the moisture diffusion along the epoxy-concrete interface nor the swelling of the interface is as significant as in the case of full immersion in water used in the laboratory testing. In addition, this study also evaluated the potential of silane coupling agent on enhancing the durability of the FRP-to-concrete interface in moisture conditions.

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Section: Specimensmentioning

confidence: 99%

Section: Relationship Between the Fracture Toughness And I Rhmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Deterioration of the FRP-to-concrete interface subject to moisture ingress: Effects of conditioning methods and silane treatment

Amidi

Wang

2016

Composite Structures

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“…While several investigations can be found in the literature focused on durability of FRP-concrete systems [6][7][8][9][10][11][12], the available information on FRP-strengthened masonry elements is still rare [13][14][15][16]. While most of the available studies focus on the effect of an isolated degrading agent on the bond behavior in FRP-strengthened systems, less attention has been given to the coupled effects (as happens in real condition) even in case of FRP-strengthened concrete elements.…”

Section: Introductionmentioning

confidence: 99%

FRP–brick masonry bond degradation under hygrothermal conditions

Maljaee

Ghiassi

Lourenço

et al. 2016

Composite Structures

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Research on coupled erosion damage model of FRP bonded concrete beams subjected to Lemaitre assumption

Zou,

2023

Polymer Composites

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In cold regions, the coupling of freeze–thaw cycles and sulfate frequently impairs the performance of FRP‐bonded concrete, resulting in a shortened service life. Carbon fiber polymer (CFRP) and glass fiber polymer (GFRP) are used to paste pre‐cracked concrete beams in the experiment, and three unfavorable environments are created: freeze–thaw cycle, 10% sulfate solution erosion, and coupling erosion. This paper investigates the durability performance of FRP bonded beams using microscopic, mechanical and dynamic modulus of elasticity tests, as well as post‐erosion damage values and finite element modeling. After 400 h of coupled erosion, sulphate erosion and freeze–thaw cyclic erosion environments, the strength of the CFRP bonded beams was reduced by 66.3%, 14.6% and 42.0% and the GFRP bonded beams by 67%, 21.9% and 52.3% respectively. The results show that single sulphate attack does not cause significant damage to the beams, but it can exacerbate the damage caused by freeze–thaw cycles. A coupled damage model based on the Lemaitre strain equivalence assumption predicted the actual coupled damage of the specimens. The finite element model can accurately predict the damage and strength of the bond surface under loading.Highlights The durability performance of CFRP and GFRP adhered pre‐cracked concrete beams Microscopic, mechanical, and dynamic elastic modulus tests are used Freeze–thaw erosion environment in 10% mass fraction sulphate solution Coupled damage models for coupled salt and freeze–thaw cycles are developed FRP‐reinforced pre‐cracked beams subjected to erosion are simulated with ABAQUS

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Subcritical debonding of FRP-to-concrete bonded interface under synergistic effect of load, moisture, and temperature

Cited by 35 publications

References 28 publications

Deterioration of the FRP-to-concrete interface subject to moisture ingress: Effects of conditioning methods and silane treatment

Deterioration of the FRP-to-concrete interface subject to moisture ingress: Effects of conditioning methods and silane treatment

FRP–brick masonry bond degradation under hygrothermal conditions

Research on coupled erosion damage model of FRP bonded concrete beams subjected to Lemaitre assumption

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