Methodology for Testing Rebar-Concrete Bond in Specimens from Decommissioned Structures

Lundgren, Karin; Robuschi, Samanta; Zandi, Kamyab

doi:10.1186/s40069-019-0350-3

Cited by 15 publications

(5 citation statements)

References 21 publications

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“…Thus, the data can only be informative. In a recent article, Lundgren et al [ 20 ] suggested an approach for selecting and designing bond tests using specimens from decommissioned structures.…”

Section: Test Specimens and Bond Test Methodsmentioning

confidence: 99%

Impact of Corrosion on the Bond Strength between Concrete and Rebar: A Systematic Review

Syll

Kanakubo

2022

Materials

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Corrosion of the reinforcement affects more than the cross-sectional area of the rebar. The volume of steel also increases due to expansive corrosion products, leading to the cracking, delamination, and spalling of concrete. As a result, the bond capacity between concrete and rebar is affected. Researchers have extensively examined the impact of corrosion on the bond strength between concrete and rebar to propose empirical, theoretical, or numerical predictive models. Therefore, research programs on this topic have increased rapidly in recent years. This article presents a systematic literature review to explore experimental methods, outcomes, and trends on this topic. The Web of Science search collected 84 relevant research articles through a rigorous selection. Key factors that affect bond strength degradation, including concrete cover, concrete strength, and stirrups, have been documented. However, a general model is still unavailable due to discrepancies caused by differences in testing methods to evaluate the effect of corrosion on bond strength. Furthermore, researchers attempted to clarify the degradation mechanism of bond strength affected by corrosion. As a result, new alternatives have been proposed to build a practical model to assess the bond strength deterioration of corroded structures.

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Section: Test Specimens and Bond Test Methodsmentioning

confidence: 99%

Impact of Corrosion on the Bond Strength between Concrete and Rebar: A Systematic Review

Syll

Kanakubo

2022

Materials

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“…Regarding the bond test performed, six articles (86%) performed the pull-out test and only one (14%) opted for the beam test. This is because, although the beam test represents reliably the steel-concrete bond behavior under tension [39], it is very laborious [59], while the pull-out test is simpler and easier to execute [60], provides accurate results [61], and shows clearly the influence of each variable on the test results [62]. Moreover, different setups and standards were used in the tests, considering the load or displacement applied to the specimen, the machine used, the geometry, the dimensions, and the specimen number, which reflect the lack of standards in the study of steel-concrete bonding.…”

Section: Bond Tests and Specimen Geometrymentioning

confidence: 99%

Bonding of Steel Bars in Concrete with the Addition of Carbon Nanotubes: A Systematic Review of the Literature

et al. 2022

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Advances and innovations in science and engineering have been increasingly supported by nanotechnology, and the modification of cementitious materials by nanoengineering is an expanding field. With this perspective, this paper aims to elucidate the behavior of steel bars in concrete with the addition of carbon nanotubes (CNTs) as a function of the characteristics of the cement-based material, the dispersion techniques and dosage of CNTs, the bond tests and specimen geometry, and the rebar characteristics. To reach this proposed goal, the ProKnow-C methodology was applied to select the most relevant publications from the last ten years, and then seven articles were fully analyzed. The results of the present systematic review of the literature revealed both consolidated knowledge and gaps to be filled in future research, as the need to study the chemical effect of adding these nanomaterials for improving steel–concrete adhesion, the bonding of thin bars in concrete, and the real influence of anchorage length on the steel–concrete bond, regardless of the use of CNTs, is vital.

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“…The test set-up was designed by using pilot tests, as discussed in [24,25]. A three-point bending test was selected (Fig.…”

Section: Test Set-upmentioning

confidence: 99%

Anchorage of naturally corroded, plain reinforcement bars in flexural members

et al. 2020

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Reinforced concrete structures are often damaged by corrosion, which affects the interaction between reinforcement bars and concrete. Earlier studies mostly applied artificial corrosion to test the bond between deformed bars and concrete. However, there is a lack of knowledge on the effects of natural corrosion on plain bars. In this paper, 20 beams with naturally corroded plain bars and varying amount of damage were taken from an 80-year-old bridge and tested in three-point bending. All but three of the specimens anchored the yield force of the bars after the opening of one or two major bending cracks. At large deflections, the load-carrying mechanism changed from beam to arch action. Eventually, end-slip of the reinforcement bars was observed. The bars were extracted, cleaned, three-dimensionally scanned, and tested in tension. The average bond strength in the unyielded zone was found to be equal to 7.39 MPa, with a standard deviation of 3.33 MPa. The casting position was identified as an important factor: when uncorroded, bottom-cast bars had a higher bond strength than that of top-cast bars. However, they were more prone to splitting cracks and, consequently, loss of bond strength for small corrosion levels. Topcast bars had increasing bond strength with increasing corrosion levels, owing to the absence of external cracks. These differences were likely related to a denser concrete surrounding the bottom-cast bars. The remaining bond capacity in the yielded zones was evaluated to be approximately 1.0 MPa.

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Methodology for Testing Rebar-Concrete Bond in Specimens from Decommissioned Structures

Cited by 15 publications

References 21 publications

Impact of Corrosion on the Bond Strength between Concrete and Rebar: A Systematic Review

Impact of Corrosion on the Bond Strength between Concrete and Rebar: A Systematic Review

Bonding of Steel Bars in Concrete with the Addition of Carbon Nanotubes: A Systematic Review of the Literature

Anchorage of naturally corroded, plain reinforcement bars in flexural members

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