Influence of corrosion on the bond strength of steel rebars in concrete

Coccia, Simona; Imperatore, Stefania; Rinaldi, Zila

doi:10.1617/s11527-014-0518-x

Cited by 164 publications

(64 citation statements)

References 25 publications

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“…The main difference of the proposed procedure, with respect to the above cited ones, lies in the possibility of recognizing, through a physical, analytical model, the actual failure mode (splitting of the concrete cover or pull-out of the ribbed bar), accounting for the stirrup presence. In particular, the proposed model extends the studies by Tepfers (1979) and den Uijl and Bigaj (1996), developed for unconfined elements on a thick-walled cylinder and by Coccia et al (2014) for the evaluation of the corrosion in reinforced concrete elements on the bond strength, introducing the effect of transverse reinforcement. Finally, a formulation of the bond-slip relationship, expressed as a function of the mechanical and geometrical parameters, is obtained through a regression with the ordinary least squares method, based on the analytical outcomes of a parametric survey.…”

Section: Introductionmentioning

confidence: 52%

Bond slip model in cylindrical reinforced concrete elements confined with stirrups

Coccia

Maggio

Rinaldi

2015

Int J Adv Struct Eng

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An analytical model able to evaluate the bondslip law of confined reinforced concrete elements is developed and presented in this paper. The model is based on the studies developed by Tepfers and by den Uijl and Bigaj on the thick-walled cylinder model and extended to the case of the presence of transverse reinforcement. The bond strength and the considered failure modes (splitting or pull-out failure) are expressed as a function of the geometrical (concrete cover and transverse reinforcement) and mechanical (concrete strength) parameters of the element. The application of the proposed methodology allows to forecast the failure mode, and equations for the bond-slip law are finally proposed for a range of steel strain lower than the yielding one.Keywords Bond-slip law Á Reinforced concrete element with stirrups Á Analytical model List of symbols r r;r i Radial stress component on the cylinder at radius r i r t;r iCircumferential stress component on the cylinder at radius r i r r;st Radial stress on the stirrups r t;st Axial stress in the stirrupsLongitudinal rebar diameter c Rebar concrete cover c 1 Cylinder radius r s Rebar radius r cr

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Section: Introductionmentioning

confidence: 52%

Bond slip model in cylindrical reinforced concrete elements confined with stirrups

Coccia

Maggio

Rinaldi

2015

Int J Adv Struct Eng

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“…Subsequent studies performed by Zhang [40] on the same beams have shown that the corrosion morphology change (from a pitting corrosion to a generalized corrosion) with the cracking propagation. After 26 years Khan [41] finds that the Rodriquez's formulation accurately predicts the crack width only if the attack penetration parameter is fixed equal to 8, while the Vidal et al model appears in a quite good agreement with the experimental results.…”

Section: (13)mentioning

confidence: 97%

Cracking in Reinforced Concrete Structures Damaged by Artificial Corrosion: An Overview

Imperatore¹,

Rinaldi²

2019

TOBCTJ

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Background:Corrosion of the reinforcing steel is a significant issue in construction engineering. As the corrosive attack propagates, the oxides accumulated on the steel-concrete interface cause a radial internal pressure in the structural element and induce a tensile stress state in the concrete with the consequent cracking. Except for few cases, the main outcomes on the behavior of reinforced concrete structures damaged by corrosion come from experimental results on artificially corroded specimens. For many years, the scientific community has been discussing the feasibility of artificial techniques to simulate the corrosion process in structural element. Specifically, the most disputed method is the accelerated electrolytic corrosion test, often characterized by high current intensities in order to reduce the duration of the experimental surveys. Objective:In the paper the influence of the current density on the degradation of a reinforced concrete element is investigated with particular reference to the kind of formed oxides and to the crack width. Methods:An experimental survey on steel rebars embedded in concrete cylinders and subjected to an electrolytic corrosion has been performed, with different increasing current densities. Furthermore, an analytical model, based on the classical thick-walled cylinder theory already proposed by the authors, is applied for validating the experimental results. Results:The oxides produced by artificial corrosion with different current densities are analyzed with X-ray diffractometry measurements. The influence of the current density on the crack widths is also pointed out. Conclusion:The analyses of the obtained results show that for the analysed specimens and current density range, no significant differences are found for the oxides composition. On the contrary the influence of the current density on the crack width is pointed out, and an upper limit of this parameter is indicated.

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“…As it was shown in [13][14][15][16][17][18][19] in the practical evaluation, one finds that the influence of the most basic variables is not as important as predicted. For instance, one originally regards that the deflection and strength of each member will result in decreased safety in the existing structure.…”

Section: Figure 1 -Block Diagram Of the Fuzzy Logic System [8]mentioning

confidence: 99%

Assessment of Existing Reinforced Concrete Structures With Usage of the Fuzzy Logic – Based Expert System

Tur¹,

YALAVAYA²

2019

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Строительство и реконструкция 74 _________________________________________________________ №5 (85) 2019 (сентябрь-октябрь) 15. Mandy Korff. Deformations and damage to buildings adjacent to deep excavations in soft soils. 1001307-004-GEO-0002, Version 02, 26 November 2009, Deltares, 2009, 143 p. 16. Chunyuk D.YU., Sergeyev S.A. Otsenka ispol'zovaniya metoda konechnykh elementov pri usilenii fundamentov rekonstruiruyemykh zdaniy [Evaluation of the use of the finite element method for strengthening the foundations of reconstructed buildings]. V mire nauchnykh otkrytiy.

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Influence of corrosion on the bond strength of steel rebars in concrete

Cited by 164 publications

References 25 publications

Bond slip model in cylindrical reinforced concrete elements confined with stirrups

Bond slip model in cylindrical reinforced concrete elements confined with stirrups

Cracking in Reinforced Concrete Structures Damaged by Artificial Corrosion: An Overview

Assessment of Existing Reinforced Concrete Structures With Usage of the Fuzzy Logic – Based Expert System

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