Comparison of rates of general corrosion and maximum pitting penetration on concrete embedded steel reinforcement

González, José Antonio Varela; Andrade, Carmen; Alonso, C.; Feliú, S.

doi:10.1016/0008-8846(95)00006-2

Cited by 335 publications

(163 citation statements)

References 6 publications

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“…A 30V DC power-supply (of type Thurlby Thandar PL320) was set to constant current mode supplying a fixed current of 100μA/cm 2 This is reported as corresponding to the maximum corrosion rate for concrete in laboratory conditions [15] and has been used by several researchers in the laboratory [8,15]. Spot checks on the output of the power supply were undertaken to ensure that the current output was constant.…”

Section: Accelerated Corrosion Testsmentioning

confidence: 99%

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Cover zone properties influencing acoustic emission due to corrosion

Ing

Austin

Lyons

2005

Cement and Concrete Research

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The deterioration of reinforced concrete is a serviceability problem world-wide. The cover zone plays an important role in the durability and serviceability of concrete and provides the initial barrier to aggressive species. The research presented investigates the potential of acoustic emission (AE) as a means of identifying corrosion at an early stage, before any significant cover damage has occurred. The purpose of part of the study was to identify the influential cover zone factors that affect the magnitude of the acoustic emission measurements per gram of steel loss. Prisms with various combinations of strength, cover thickness, aggregate and rebar diameters were studied to ascertain the important variables likely to be encountered on reinforced structures.The experimental results confirmed that early corrosion, verified by internal visual inspection and mass loss, can be detected by AE and before any external signs of cracking. They also show that the most influential parameter affecting the AE measurement is concrete strength, being exponentially related to the AE Energy.Material properties such as cover thickness had a negligible effect on AE Energy during the initial stages of reinforcement corrosion, whereas from this initial work, the rebar diameter indicated a promising relationship with AE Energy per gram of steel loss.

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Section: Accelerated Corrosion Testsmentioning

confidence: 99%

“…This increase in volume exerts stresses within the concrete, resulting in localised microcracking once the tensile capacity has been exceeded. In some instances, it has been reported that only 10-50 μm of steel corrosion has been sufficient to crack 20 mm of cover [8].…”

Section: Introductionmentioning

confidence: 99%

Cover zone properties influencing acoustic emission due to corrosion

Ing

Austin

Lyons

2005

Cement and Concrete Research

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“…Area reduction in certain pits can reach up to seven times the average area lost along bar length (Gonzalez et al, 1995;Rodriguez et al, 1996;Pina, 2009). Therefore, when localized corrosion takes place, reinforcement area reduction including bar decreased ductility, due pits strain localization, are the fundamental factors causing impaired structural behavior.…”

Section: Corrosion Deteriorating Effectsmentioning

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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“…For uniform corrosion (carbonation) Rcorr = 1, for pitting corrosion (chlorides) Rcorr = <2; 4> according to [9] or Rcorr = <4; 5.5> according to [10]. Effective bar diameter for both types of corrosion is obtained from:…”

Section: Carbonation During Propagation Phasementioning

confidence: 99%