Concrete cover cracking due to uniform reinforcement corrosion

Solgaard, Anders Ole Stubbe; Michel, Alexander; Stang, Henrik

doi:10.1617/s11527-013-0016-6

Cited by 30 publications

(9 citation statements)

References 18 publications

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“…Moreover, FRC may delay cover cracking under corrosion expansion due to the additional confinement provided by fibres [38,39]. Undoubtedly, longitudinal cracks may greatly aggravate the total steel loss (as in pit volume) by increasing the anodic length.…”

Section: Implications For the Long-term Durability Of Frc Structuresmentioning

confidence: 99%

Correlation between concrete cracks and corrosion characteristics of steel reinforcement in pre-cracked plain and fibre-reinforced concrete beams

et al. 2020

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This paper presents results on corrosion characteristics of 66 rebars extracted from un-and precracked plain concrete and fibre-reinforced concrete (FRC) beams suffering from corrosion for more than 3 years. The influences of fibre reinforcement, flexural cracks, corrosion-induced cracks and loading condition on the maximum local corrosion level (defined as the maximum cross-sectional area loss percentage) and pit morphology were examined. With 3D-scanning, the corrosion characteristics were analysed, and pit types were classified based on the maximum local corrosion level and geometric parameters of pits. Corrosion pits were observed near some flexural cracks, while the bars at other cracks were free from corrosion. Most rebars in FRC had less maximum local corrosion level than those in plain concrete under the same loading condition and maximum flexural crack width. However, the maximum local corrosion level was not dependent on the maximum flexural crack width (0.1 and 0.4 mm). Longitudinal cracks (corrosion-induced cracks) aggravated the total steel loss and changed the pit morphology by promoting the pit length development. However, longitudinal cracks did not always form, even with severe pitting corrosion. A hypothesis about the time-dependent interplay between transverse and longitudinal cracks and corrosion development was proposed. Further studies on predicting the pitting corrosion evolution and experimental work on specimens exposed for longer periods are needed to understand and quantify the long-term durability of concrete structures reinforced with both conventional reinforcing bars and fibres.

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Section: Implications For the Long-term Durability Of Frc Structuresmentioning

confidence: 99%

Correlation between concrete cracks and corrosion characteristics of steel reinforcement in pre-cracked plain and fibre-reinforced concrete beams

et al. 2020

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“…At the same time, the oxide layer is compressed by the concrete, temporarily increasing the steel–concrete bond . When the circumferential tensile stress at the oxide–concrete interface reaches the maximum tensile strength of the concrete, corrosion‐induced cracks occur in the concrete, initially at the oxide–concrete boundary and then expanding until they reach the external surface of the concrete cover . To evaluate the loss of structural capacity of RC elements, the required amount of corroded reinforcement existing at the onset of full cracking of the concrete cover is one of the most important parameters that must be studied.…”

Section: State Of the Artmentioning

confidence: 99%

“…27,28 When the circumferential tensile stress at the oxide-concrete interface reaches the maximum tensile strength of the concrete, corrosion-induced cracks occur in the concrete, initially at the oxide-concrete boundary and then expanding until they reach the external surface of the concrete cover. 29 To evaluate the loss of structural capacity of RC elements, the required amount of corroded reinforcement existing at the onset of full cracking of the concrete cover is one of the most important parameters that must be studied. A considerable number of experimental studies have been conducted on corrosion-induced concrete cracking, primarily focusing on two aspects of the cracking process: predicting steel corrosion leading to surface cracking, and linking the crack width on the surface of the concrete cover with the loss of steel section due to the corrosion process.…”

mentioning

confidence: 99%

Nondestructive assessment of corrosion of reinforcing bars through surface concrete cracks

Bossio

Lignola

Fabbrocino

et al. 2017

Structural Concrete

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Degradation of reinforced concrete (RC) structures is a serious safety problem affecting all industrialized countries, and the economical aspect of this problem cannot be neglected. One of the main reasons for the degradation of RC is the corrosion of steel reinforcing bars as a result of concrete cover cracking and reduction in bar cross section. As a consequence, the structural capacity of RC elements decreases progressively as degradation develops. Nondestructive testing and/or analytical formulation represent high-quality rapid methods for evaluating the corrosion penetration of bars and provide useful parameters for designing retrofits. This paper presents an additional tool that can be used to evaluate and assess the vulnerability of existing structures in terms of the determination of bar cross section lost. Using simple charts and formulas, this can be accomplished by calculating reinforcing bar cross section loss due to corrosion by measuring external crack widths in the concrete cover. Predictions were obtained by using two analytical models developed. These predictions have been satisfactorily compared with both the literature and new experimental results, as well as with previous empirical models available in the scientific literature. The experimental results were obtained by corroding real-scale concrete specimens reinforced with smooth and ribbed bars (according to old and modern building codes) using 3.5 wt% sodium chloride solution and an applied current

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“…These coupling effects decrease the durability and safety of concrete structures. Cover cracking has been considered as an indicator of the service life end for the existing concrete structures [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Concrete Cracking Prediction Including the Filling Proportion of Strand Corrosion Products

et al. 2016

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The filling of strand corrosion products during concrete crack propagation is investigated experimentally in the present paper. The effects of stirrups on the filling of corrosion products and concrete cracking are clarified. A prediction model of crack width is developed incorporating the filling proportion of corrosion products and the twisting shape of the strand. Experimental data on cracking angle, crack width, and corrosion loss obtained from accelerated corrosion tests of concrete beams are presented. The proposed model is verified by experimental data. Results show that the filling extent of corrosion products varies with crack propagation. The rust filling extent increases with the propagating crack until a critical width. Beyond the critical width, the rust-filling extent remains stable. Using stirrups can decrease the critical crack width. Stirrups can restrict crack propagation and reduce the rust filling. The tangent of the cracking angle increases with increasing corrosion loss. The prediction of corrosion-induced crack is sensitive to the rust-filling extent.

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Concrete cover cracking due to uniform reinforcement corrosion

Cited by 30 publications

References 18 publications

Correlation between concrete cracks and corrosion characteristics of steel reinforcement in pre-cracked plain and fibre-reinforced concrete beams

Correlation between concrete cracks and corrosion characteristics of steel reinforcement in pre-cracked plain and fibre-reinforced concrete beams

Nondestructive assessment of corrosion of reinforcing bars through surface concrete cracks

Concrete Cracking Prediction Including the Filling Proportion of Strand Corrosion Products

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