Reinforced concrete in marine environment: Effect of wetting and drying cycles, height and positioning in relation to the sea shore

Medeiros, Marcelo Henrique Farias de; Gobbi, Andressa; Réus, Giovana Costa; Helène, Paulo

doi:10.1016/j.conbuildmat.2013.02.078

Cited by 82 publications

(37 citation statements)

References 12 publications

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“…This behavior is coherent with recommendation from Helene [5] and Poursaee and Hansson [34] about previously saturating the pieces of reinforced concrete (at least one hour before) for starting the corrosion potential readings. According to Medeiros et al [15], this practice is adopted in works of inspecting reinforced concrete structures in order to execute the corrosion potential readings under the worse possible condition. The trend of the corrosion potential value becoming more negative as the concrete becomes more humid is substantiated in the increasing of the electric potential of the concrete, facilitating the electrical contact between the reference electrode and the steel bar, which is the focus of the corrosion state measurement.…”

Section: Influence Of Moisture Contentmentioning

confidence: 99%

“…According to Andrade & Alonso [1] and Assouli et al [2], the open circuit corrosion potential and electrical resistivity are the most common techniques for evaluating the corrosion of reinforcements, even if they are merely qualitative techniques evaluating the thermodynamics of the process, not providing data about the kinetics of the phenomenon. Despite this affirmation being more than 10 years old, the method of corrosion potential continues to be one of the more common electrochemical tools for helping the inspection, monitoring and diagnostic of the corrosion of the reinforcements of concrete structures [3], being cited as a method of monitoring in inspection works in the field as recorded in the following studies: Andrade & Alonso [1]; Liam et al [4]; Helene [5]; Broomfield et al [6]; Elsener et al [7]; Feliu et al [8]; Helene et al [9]; Poupard et al [10]; Castro-Borges & Ordaz [11]; Medeiros et al [12]; CastroBorges et al [13]; Medeiros et al [14,15]. This method has also been used to evaluate the efficiency of repair systems, measuring the repassivation capacity of reinforcements in concrete submitted to extraction of chlorides, besides testing the efficiency of realkalisation and corrosion inhibitors [16].…”

Section: Introductionmentioning

confidence: 99%

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Corrosion potential: influence of moisture, water-cement ratio, chloride content and concrete cover

Medeiros

Rocha

Medeiros-Junior

et al. 2017

Rev. IBRACON Estrut. Mater.

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ResumoThe corrosion potential technique is used as an electrochemical method to support the monitoring of reinforcement corrosion in reinforced concrete structures. The corrosion potential ranges and its correlation with corrosion's likelihood (recommended by ASTM C 876:2015) are usually employed as an evaluation criterion of the results. The thermodynamic state of corrosion in the structure or specimen (laboratory) can be established if these criteria are well used. However, the method is infl uenced by numerous factors related to the concrete, environment and the procedures adopted at the time of the test. In order to provide useful information to technical and scientifi c community for the correct use of this type of non-destructive evaluation technique, the aim of this article is to evaluate some of the possible factors of infl uence on the corrosion potential measures, such as concrete moisture content, water-cement ratio, thickness of the concrete cover and degree of chloride contamination. The results indicate that moisture and the degree of chloride contamination tend to make more electronegative corrosion potential. Furthermore, the infl uence of concrete cover is diff erent for concrete contaminated (1% of chloride by weigh of cement) and not contaminated by chlorides: the infl uence of the cover thickness in the concrete contaminated with chlorides was reverse because the greater the cover thickness, the least electronegative corrosion potential value; on the other hand, in the concrete without contamination by chlorides, the eff ect of the cover thickness in corrosion potential readings was irrelevant. All these statements were proven with 95% statistical signifi cance.Keywords: corrosion potential, concrete moisture content, water-cement ratio, chloride, concrete cover.O método de medida de potencial de corrosão é utilizado como uma ferramenta eletroquímica de auxílio ao monitoramento da corrosão das armaduras de estruturas de concreto armado. Como critério de avaliação dos resultados, é comum que sejam adotados os intervalos de potencial de corrosão e sua correlação com a probabilidade de corrosão, preconizadas pela ASTM C 876:2015. Com este critério é possível estabelecer um panorama da situação termodinâmica de corrosão na estrutura ou no corpo de prova em laboratório. Porém, o método é infl uenciado por inúmeros fatores relacionados ao concreto, ao ambiente e aos procedimentos adotados no momento da realização das leituras. Visando fornecer informações para orientar o meio técnico e científi co ao uso correto deste tipo de método de avaliação não destrutiva, o objetivo deste trabalho é avaliar alguns dos possíveis fatores de infl uência nas medidas de potencial de corrosão, tais como: teor de umidade do concreto, relação água/cimento, espessura do cobrimento das armaduras e grau de contaminação por cloretos. Os resultados indicaram que a umidade e o grau de contaminação do concreto por íons cloretos tenderam a tornar o potencial de corrosão mais eletronegativo. Além disso, foi verifi c...

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Section: Influence Of Moisture Contentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Corrosion potential: influence of moisture, water-cement ratio, chloride content and concrete cover

Medeiros

Rocha

Medeiros-Junior

et al. 2017

Rev. IBRACON Estrut. Mater.

Self Cite

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“…The chloride-induced corrosion in steel reinforcement of an RC beam increases when it is exposed to salt-water. Medeiros, Gobbi [3] reported that in RC structures wet/dry cyclic exposure has a significant effect on chloride-ion content. This content is about 3 to 8 times higher than in structures that are not exposed to wet/dry exposure.…”

Section: Introductionmentioning

confidence: 99%

The Behavior of Carbon Fiber Reinforced Polymer (Cfrp) Strengthened Beams Under a Marine Environment

Fazli

Yassin

Shafiq

et al. 2017

GEOMATE

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Marine concrete structures are subjected to a harsh environment and potential climate change variables. Deterioration of the structure demands drastic measures for repair and rehabilitation. Advanced composite materials exhibit unique advantages compared to conventional construction materials. Over the years, carbon fiber reinforced polymer (CFRP) composite material has been used widely for the repair and rehabilitation of structures. Many studies have been conducted on the performance of FRP flexural strengthened reinforced concrete (RC) members. Still, experimental studies investigating the performance of shear strengthening under real environmental conditions are lacking. This paper helps fill this gap because it is an experimental investigation of the behavior of CFRP shear strengthened RC beams under a marine environment. Specimens were exposed to cyclic (wet/dry) and full exposure to the elements for a 3-month period. Six strengthened beams and one unstrengthened beam were tested; the tested control beam failed due to a diagonal-tension crack. The increase in the concrete shear capacity of the strengthened specimens was in the range of 14-18% compared to the control beam. Thus, the results lead to the conclusion that CFRP strengthening increases the shear capacity of specimens considerably.

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“…Actually, an increasing number of studies are being conducted on chloride-induced corrosion in real structures (Costa and Appleton, 2002;Medeiros et al, 2013;Shekarchi et al, 2011;Papé and Melchers, 2011;Melchers and Li, 2009). …”

Section: Introductionmentioning

confidence: 99%

Service-Life Assessment of Existing Precast Concrete Structure Exposed to Severe Marine Conditions

Segura

Cavalaro

Fuente

et al. 2016

J. Perform. Constr. Facil.

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The overall performance of a concrete structure is considered to be a key issue when determining its service life. The widespread use of precast concrete and consideration of durability as a design parameter in most of the international codes have the goal of achieving concrete structures with better durability. Nevertheless, the early deterioration of concrete is still common in a large number of concrete structures, which reduces the service life. This paper presents a case study of an existing precast concrete cooling tower for a thermal power station subjected to severe marine exposure conditions, which showed symptoms of serious deterioration after operating for three years. The main goal of this study was to clarify the origin of the accelerated deterioration of the structure. Wetting-drying cycles were identified as the main cause of the early deterioration of the structure. Furthermore, estimations on its remaining service life were made considering the accelerating effect of the wetting-drying cycles. Finally, the variation in the safety factor of the main structural elements was evaluated.

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Reinforced concrete in marine environment: Effect of wetting and drying cycles, height and positioning in relation to the sea shore

Cited by 82 publications

References 12 publications

Corrosion potential: influence of moisture, water-cement ratio, chloride content and concrete cover

Corrosion potential: influence of moisture, water-cement ratio, chloride content and concrete cover

The Behavior of Carbon Fiber Reinforced Polymer (Cfrp) Strengthened Beams Under a Marine Environment

Service-Life Assessment of Existing Precast Concrete Structure Exposed to Severe Marine Conditions

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