Service Life Forecasting for Reinforced Concrete Incorporating Potential-Dependent Chloride Threshold

Sagüés, Alberto A.; Sánchez, Andrea N.; Lau, Kingsley; Kranc, S C

doi:10.5006/1286

Cited by 24 publications

(12 citation statements)

References 16 publications

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“…[13][14][15][16][17][18][19][20][21][22] In some cases, these models considered also the relationship between the electrochemical potential and CTL for damage forecast. [23][24] The goal of this study was to investigate how macrocell formation could affect the potential and the corrosion rate of steel in different steady-state situations, corresponding to different phases of the life of a hollow submerged RC structure.…”

Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Initiation and Propagation of Corrosion in Hollow Submerged Marine Concrete Structures

Pergola¹,

Lollini²,

Redaelli³

et al. 2013

Corrosion

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When reinforced concrete structures exposed to marine environments have both saturated and aerated parts, as for instance submerged tunnels or car parks, a macrocell can develop. This may cause an increase in the potential and the corrosion rate of reinforcing steel in the saturated part. The aim of this paper is to study the effects of macrocells during corrosion initiation and propagation through numerical simulations of a wall separating a dry environment from seawater. When steel bars are passive, the macrocell increases the potential of rebars in saturated concrete and promotes steel depassivation. After corrosion initiation, the macrocell increases steel corrosion rate by several orders of magnitude, favouring also corrosion localisation. A sensitivity analysis was carried out to investigate the influence of the main parameters: the models showed that some electrochemical parameters, such as the cathodic Tafel slope of steel polarisation curve, have a strong influence on the results

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Section: Introductionmentioning

confidence: 99%

Numerical Modeling of Initiation and Propagation of Corrosion in Hollow Submerged Marine Concrete Structures

Pergola¹,

Lollini²,

Redaelli³

et al. 2013

Corrosion

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“…6a, b. Prior to activation, the entire rebar surface undergoes uniform passive corrosion with a passive corrosion current density of 1 * 10 −4 A/m 2 as reported by experiments performed by Poursaee and Hansson (2007) and computational studies performed by Sagüés et al (2014).…”

Section: Randomly Varying Chloride Function F Pmentioning

confidence: 83%

“…The numerical model is able to change the metal dissolution currents at these spatial locations. Other models employing a varying chloride threshold include works of Sagüés et al (2014), Walsh (2015) and Michel (2013).…”

Section: Depassivation Based On Random Distribution Of Chloride Thresmentioning

confidence: 99%

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Enhanced Predictive Modelling of Steel Corrosion in Concrete in Submerged Zone Based on a Dynamic Activation Approach

Mir¹,

Höche²,

Gomes³

et al. 2019

Int J Concr Struct Mater

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A numerical model for enhanced service life prediction of concrete infrastructure is presented which includes transient analysis of processes during corrosion initiation as well as propagation stage. The temporal and spatial transition of Steel-Concrete Interface during depassivation events is described by a randomly varying chloride threshold function. As such random activation events can be accounted for, rather than having to pre-describe the anode size and location as in many existing models. The aim of the study is to investigate random spatial activation events in concrete structures in submerged zones based on dynamically changing boundary conditions on the rebar surface to control transition from passive to active state. Investigations are carried out to realize the sustainability of corrosion processes in limiting oxygen concentrations in dissolved seawater. The model showcases the numerical architecture, the associated concept of randomly varying chloride threshold and predicts that among other factors, the rate of oxygen strongly influences corrosion rate in submerged locations.

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“…[42][43][44][45]. The impact of ongoing corrosion on chloride thresholds of cathodic sites is modelled as potential-dependent chloride thresholds according to [43]:…”

Section: Chloride Thresholds 32mentioning

confidence: 99%

Multi-scale and multi-physics deterioration modelling for design and assessment of reinforced concrete structures

Michel¹,

Lepech²,

Wu³

et al. 2017

RILEM Tech Lett

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This paper discusses the need for reliable and valid multi-scale and multi-physics prediction models to support the design of new as well as the assessment, maintenance, and repair of existing reinforced concrete structures. A multi-physics and multi-scale deterioration model for chloride-induced corrosion of reinforced concrete has been established. Ongoing work includes extension of the model to 3D as well as modelling of the impact of the steel-concrete interface characteristics and electrochemical potential on chloride thresholds. Identified challenges include, among others, the improved understanding and modelling of single-and multi-deterioration mechanisms, environmental exposure, and data for validation. We envision that next generation maintenance and management of reinforced concrete infrastructure will combine numerical simulations based on multi-scale and multi-physics principles and extensive in-situ monitoring, allowing continuous Bayesian updating of 4D simulations of functional performance.

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Service Life Forecasting for Reinforced Concrete Incorporating Potential-Dependent Chloride Threshold

Cited by 24 publications

References 16 publications

Numerical Modeling of Initiation and Propagation of Corrosion in Hollow Submerged Marine Concrete Structures

Numerical Modeling of Initiation and Propagation of Corrosion in Hollow Submerged Marine Concrete Structures

Enhanced Predictive Modelling of Steel Corrosion in Concrete in Submerged Zone Based on a Dynamic Activation Approach

Multi-scale and multi-physics deterioration modelling for design and assessment of reinforced concrete structures

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