Corrosion-induced cracking and bond behaviour of corroded reinforcement bars in SFRC

Berrocal, Carlos Gil; Fernandez, Ignasi; Lundgren, Karin; Löfgren, Ingemar

doi:10.1016/j.compositesb.2017.01.020

Cited by 64 publications

(32 citation statements)

References 23 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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“…Different approaches have been followed in the current state of the art for the modelling of the structural effects of corrosion of steel reinforcement in RC structures. As it is reflected in many studies and in the present work, the effects of corrosion on the structural behavior are very wide and complex (Fernandez et al 2015; Tahershamsi Page 20 of 23 Fernandez et al Int J Concr Struct Mater (2018) 12:75 et al 2014Berrocal et al 2017;Cairns et al 2005;Cobo et al 2011;Stewart 2009;Law et al 2008;Zhu et al 2013). One of the most relevant structural effects of corrosion of reinforcing steel bars are those derived from the change of the interaction between the concrete and steel, namely bond behavior.…”

Section: Modelling Approaches For the Assessment Of Corroded Rc Strucmentioning

confidence: 70%

“…For example, in order to capture local effects, full interaction models that account for the multiaxial stress state around the steel bar are necessary for a realistic representation of the corrosion effects on the structure. Such models require the development of 3D solid models that can cope with the full description of the bond interaction (Berrocal et al 2017;Jansson et al 2012;Lundgren 2002;Ožbolt et al 2011). Nevertheless, some efforts have been carried out to perform simplifications in the modelling approaches for two reasons.…”

Section: Modelling Approaches For the Assessment Of Corroded Rc Strucmentioning

confidence: 99%

Ultimate Capacity of Corroded Statically Indeterminate Reinforced Concrete Members

Fernandez

Herrador

Bernat

et al. 2018

Int J Concr Struct Mater

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The corrosion of steel reinforcement is commonly believed to be the primary cause of structural deterioration of reinforced concrete (RC) structures; as a result of this deterioration, a RC structure can incur a considerable reduction in structural serviceability and safety. Because of their inherent redundancy, statically indeterminate structures develop resistant mechanisms that can potentially assist in delaying the collapse of severely damaged RC structures. In order to experimentally demonstrate these resistant mechanisms, four groups of three two-span continuous RC beam members each were deteriorated using induced corrosion methods and tested to failure under monotonic loads. For control, one group of three RC beams was left uncorroded and similarly load tested. All the RC beam specimens subjected to corrosion demonstrated a significant reduction (a maximum reduction of 55% as compared to the uncorroded control group) of their ultimate capacity. The presence of corrosion induced a transition from flexural failure to anchorage failure in some specimens; despite the induced damage some redistributed structural capacity was observed. Modelling of deterioration effects by the inclusion of different aspects of corrosion was also conducted. Three-dimensional (3D) Finite-Element Method (FEM) models were developed to assess the variation in the mechanical properties of the corroded steel and the reduction in the bond interaction between concrete and steel due to the corrosion of the steel reinforcement. In general, the current 3D FEM models demonstrated a good agreement with the experimental data; however, 3D FEM models that exhibit greater sophistication are necessary to better describe the failure mode of some RC beam specimens when they are associated with local effects.

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“…Metallic bristle brushing is the most commonly used cleaning method [27,30,31]; this is mainly because it entails a low number of requirements for its use. Conversely, immersion in an acid solution is less common [7,15,32,33]. As required by the specified standard [20], the weight loss was measured after several cleaning cycles.…”

Section: Removal Of Corrosion Products and Assessment Of The Corrosiomentioning

confidence: 99%

“…For example, several previous studies [1][2][3][4] addressed the structural effects of corrosion. Various studies investigated local aspects that addressed the effects of corrosion on bond behaviour [5][6][7], change in mechanical properties [8][9][10][11], and other corrosion related phenomena [12][13][14][15]. However, most existing studies were conducted under accelerated corrosion conditions.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of corrosion level of naturally corroded bars using different cleaning methods, computed tomography, and 3D optical scanning

2018

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Reliable methods are necessary to assess the corrosion level to establish links between structural performance and reinforcement corrosion in concrete structures. Hence, in this study, a set of naturally corroded bars were subjected to metallic brushing, acid immersion, and sandblasting for rust removal. Additionally, 3D optical, CT scanning, and weight loss measurements were used to evaluate the levels of corrosion. The results indicate that sandblasting is an optimal cleaning method. Weight loss measurements are sufficient when detailed information about corrosion is not required, and 3D scanning is preferred if information on corrosion variation along the bar is needed.

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Corrosion-induced cracking and bond behaviour of corroded reinforcement bars in SFRC

Cited by 64 publications

References 23 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

Ultimate Capacity of Corroded Statically Indeterminate Reinforced Concrete Members

Evaluation of corrosion level of naturally corroded bars using different cleaning methods, computed tomography, and 3D optical scanning

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