Reliability‐based approach to the robustness of corroded reinforced concrete structures

Cavaco, Eduardo; Neves, Luís; Casas, Joan R.

doi:10.1002/suco.201600084

Cited by 22 publications

(15 citation statements)

References 34 publications

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“…Although these results are not that accurate as those achieved using the most powerful camera (Canon 1200D), there is no doubt these results are still of great practical interest. Note that the concrete crack spreading stage occurs for corrosion levels ranging from 2.5 to 4–5%, depending on a wide variety of factors such as diameter and spacing of RBs, corrosion rate, concrete cover thickness and strength grade and presence and spacing of stirrups …”

Section: Resultsmentioning

confidence: 99%

“…Corrosion of embedded steel rebars has a tremendous impact on the long‐term performance of reinforced concrete (RC) structures, either prestressed or non‐prestressed, accelerating its deterioration and aging, and reducing its safety and expected service life . Optimal decision‐making about maintenance, repair, and operation of corroding RC structures must consider the structural deteriorating effects of corrosion, which are strongly dependent on the actual corrosion levels (measured in terms of rebar's cross section loss percentage) and on its spatial variability …”

Section: Introductionmentioning

confidence: 99%

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A new method for corrosion assessment of reinforcing bars based on close‐range photogrammetry: Experimental validation

Cavaco

Pimenta

Valença

2019

Structural Concrete

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In most developed countries, a significant portion of the nation's Gross Domestic Product (GDP) is spent on maintenance of reinforced concrete (RC) structures suffering from corrosion. Although extensive research has been devoted to this issue, little attention has been given to the study of accurate methods to quantify corrosion and its spatial variability. As a result, scattered data can be found in the literature, relating the rates of corrosion, its penetration depth, and the resulting structural deteriorating effects. In this paper, a new cost‐effective and versatile method for corrosion assessment of RC structures based on close‐range photogrammetry is proposed. This method was validated by applying it to an experimental research on an accelerated corrosion test of reinforcing bars (RBs). The tests performed show that the proposed method can provide accurate results independent of the RB diameter, length, and corrosion level (measured in terms of rebar's cross section loss percentage), as long as sufficient image overlapping is ensured along the axial and radial axes of the rebar. The results obtained also prove that the method is suitable to measure spatial variability of corrosion attack, providing much better results than those gained from existing geometrical models based on the maximum pit depth. More precise results can be achieved by using semi‐professional Digital Single‐Lens Reflex Cameras (DSLR) cameras having the additional advantage to be suitable for low levels of corrosion attack. However, the research performed shows that accurate results can also be obtained even when a less sophisticated or a smartphone camera is used.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A new method for corrosion assessment of reinforcing bars based on close‐range photogrammetry: Experimental validation

Cavaco

Pimenta

Valença

2019

Structural Concrete

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“…A reinforced concrete bridge under advanced deterioration due to reinforcement corrosion will be used as example, as corrosion is the most damaging phenomenon leading to progressive damage. In a previous paper (Cavaco et al, 2016), the authors have shown the application of the present concept to a isostatic structure.…”

Section: Introductionmentioning

confidence: 91%

“…Moreover, two different structures can have similar robustness indices even if one presents a smooth reduction of performance with deterioration and the other shows a sudden loss of performance at a certain damage level. To overcome this limitation, and to take into account the uncertainties involved, the robustness measure proposed by Cavaco et al (2013b) is improved by quantifying the performance, f in Equation (2), through the reliability index, β (Cavaco et al, 2016). Damage, d, produced by corrosion, will be measured in terms of reinforcement bars weight loss percentage, X P .…”

Section: Structural Robustness and Deteriorationmentioning

confidence: 99%

On the robustness to corrosion in the life cycle assessment of an existing reinforced concrete bridge

Cavaco

Neves

Casas

2017

Structure and Infrastructure Engineering

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Management of existing structures has traditionally been based on condition assessment, based on visual inspections, disregarding the susceptibility of different structural types to aging and deterioration. Robustness, as a measure of the effects of unpredictable damage to structural safety can be a complementary information to the results of inspection. Although robustness has mostly been used to evaluate the consequences of extreme events, a similar framework can be used to investigate the result of aging, allowing a better understanding of the potential effects of deterioration and allowing a better allocation of available maintenance funding. In this work, a probabilistic structural robustness indicator is used to quantify the susceptibility of structures to corrosion. The methodology is exemplified through a case-study comprising an existing reinforced concrete bridge deck, heav- * Corresponding author Email address: joan.ramon.casas@upc.edu (Joan R. Casas)Preprint submitted to Structure and Infrastructure Engineering December 29, 2016 ily damaged due to reinforcement corrosion, and finally demolished due to safety concerns. Robustness measures the bridge deck safety tolerance to reinforcement corrosion. The principal effects of corrosion, including loss of area and bond between concrete and steel are modelled using a non-linear finite element model, coupled with a Response Surface Method to compute the bridge reliability as a function of the corrosion level, and finally used to assess robustness. Results show that the redundancy of the bridge allow significant redistribution of loads between elements with different corrosion levels. As a result, the bridge presents significant robustness and tolerance to reinforcement corrosion.

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“…It should be noted that these types of cracks tend to happen inside the concrete considering generated load due to expansion is happening from the inside. On the other hand, external loading tends to generate crack on the surface of concrete …”

Section: Introductionmentioning

confidence: 99%

Modeling of chloride ions penetration in cracked concrete structures exposed to marine environments

Ramezanianpour

Ghoreishian

Ahmadi³

et al. 2018

Structural Concrete

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The degradation caused by corrosion of rebar in concrete structures is one of the most important issues to attract the attention of researchers focused on concrete durability. Penetration of chloride ions into concrete is one of the factors that can contribute to corrosion of rebar and consequently the strength of concrete structures as well as serviceability reduction. In this study, an experimental model was proposed to predict penetration of chloride ions into cracked concrete by performing non‐destructive tests. Tests were performed after 48‐months exposure of all samples to a harsh marine environment. For studying the influence of load‐induced cracks on the rebar corrosion, cracked and uncracked beams were tested. Results of this study demonstrated that by the increment of the crack width, corrosion of reinforcement increased and as a result, the probability of degradation of reinforced concrete beams increased accordingly. Furthermore, by the increment of crack width, their depth also increased which caused enhancement of crack depth on the rebar and easier access of chloride ions to the rebar.

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Reliability‐based approach to the robustness of corroded reinforced concrete structures

Cited by 22 publications

References 34 publications

A new method for corrosion assessment of reinforcing bars based on close‐range photogrammetry: Experimental validation

A new method for corrosion assessment of reinforcing bars based on close‐range photogrammetry: Experimental validation

On the robustness to corrosion in the life cycle assessment of an existing reinforced concrete bridge

Modeling of chloride ions penetration in cracked concrete structures exposed to marine environments

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