Proposed criterion to assess the electrochemical behavior of carbon steel reinforcements under corrosion in carbonated concrete structures after patch repairs

Ribeiro, Josimar; Panossian, Zehbour; Selmo, Sílvia M.S.

doi:10.1016/j.conbuildmat.2012.09.097

Cited by 23 publications

(16 citation statements)

References 11 publications

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“…Dentro deste pano de fundo, as argamassas de reparo têm sido pesquisadas com o foco em temas diversos. Por exemplo: Atzeni et al [3] estudaram a influência dos ciclos de gelo e degelo no mecanismo de falha de reparos localizados; Hassan et al [4] e Mirza et al [5] estudaram a eficiência dos reparos de cimento Portland expostos a clima quente e seco e em clima frio, respectivamente; Medeiros et al [6], Ramli et al [7] e Ma, Li [8] pesquisaram o melhoramento das argamassas de reparo usando adição de polímeros; Medeiros [9] e Ramli, Tabassi [10] abordaram a influência das condições de cura nas propriedades das argamassas de reparo; Ribeiro et al [11] focaram na avaliação da interação eletroquímica entre o aço e a argamassa em áreas reparadas.…”

Section: Introductionunclassified

Compósitos de cimento Portland com adição de nanotubos de carbono (NTC): Propriedades no estado fresco e resistência à compressão

Medeiros¹,

Dranka²,

Mattana³

et al. 2015

Matéria (Rio J.)

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Alguns estudos têm sido desenvolvidos sobre a adição de nanotubos de carbono (NTCs) em compósitos cimentícios e indicam melhorias nas propriedades mecânicas, como aumento da resistência à compressão, à tração e diminuição da porosidade. Com base nessas possíveis melhorias, essa pesquisa foi realizada para analisar a influência dos NTCs na resistência à compressão e fluidez de compósitos de cimento Portland que possam ser usados para reabilitação de estruturas de concreto. Desse modo, foram realizados ensaios de resistência à compressão, squeeze flow, flow table, funil de Marsh e miniabatimento. Foram fixadas uma argamassa e uma pasta de referência (sem adição de nanotubos de carbono), que foram replicadas com mesmo traço e a incorporação de 5 teores de NTCs em relação à massa de cimento: 0,1%, 0,2%, 0,3%, 0,4% e 0,5%. Estes teores foram escolhidos de modo a abranger a faixa de teores mais usadas nas pesquisas sobre NTCs adicionados aos compósitos de cimento Portland. Com relação aos ensaios de medição de fluidez, foi constatado que quanto maior o teor de NTC, mais consistente o compósito cimentício, com indícios de que os teores menores ou iguais a 0,3% são mais adequados para manter a fluidez do compósito de cimento Portland. No caso da resistência à compressão, os resultados indicam que a adição de 0,40% de nanotubos de carbono tende a elevar a resistência em 27%. Por outro lado, a adição de 0,5% de NTC deixou o compósito tão consistente que dificultou a moldagem e a elevação da resistência foi nula comparada a série de referência.

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Section: Introductionunclassified

Compósitos de cimento Portland com adição de nanotubos de carbono (NTC): Propriedades no estado fresco e resistência à compressão

Medeiros¹,

Dranka²,

Mattana³

et al. 2015

Matéria (Rio J.)

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“…The method suggests the selection of repair materials based on its tendency to form a macrocell corrosion cell when attached to the substrate concrete (Ribeiro, Panossian, & Selmo, 2013). The combination of tests, such as the resistance to chloride ion penetration, electrical resistivity, water absorption, and the potential to form macrocell corrosion, can provide the comprehensive idea about the suitability of a repair material when it is to be applied in chloridecontaminated concrete.…”

Section: Selection Of Repair Materialsmentioning

confidence: 99%

Performance of Concrete Patch Repairs: From a Durability Point of View

Eldho¹,

Nanayakkar²,

Xia³

et al. 2016

Proceedings of the 5th International Conference on the Durability of Concrete Structures

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Chloride contamination in reinforced concrete leads to the corrosion of steel bars. Concrete patch repairs are widely practiced as a remedial measure for the mitigation of such corrosion in reinforced concrete structures. The performance of the patch repairs was studied by various researchers in the past. The structural and material aspects of patch repairs have received more attention than the electrochemical consequences of patch repairs in past studies. But electrochemical changes could be the underlying cause for the failure of many patch repairs. This paper reviews the performance of patch repairs from a durability point of view. It covers the formation of incipient anodes, which are the new corrosion sites formed after a patch repair process. The prevailing corrosion mechanism at the incipient anodes is discussed. The performance of patch repairs when modified with corrosion inhibitors and sacrificial anodes is examined. The importance of the selection of repair materials from a durability point is highlighted considering the electrochemical consequences of patch repair.

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“…Riberio et al [1] studied the electrochemical behavior of carbon steel reinforcements under corrosion. Generally, in the chemical composition of S420 reinforcement steels, between 0.4 and 0.45 wt.% of the carbon is included.…”

Section: Introductionmentioning

confidence: 99%

“…It consists of thin high-strength steel fibers embedded in a polymer matrix. In the literature [3][4][5][6][7][8], *Corresponding author: tel. : +90 530 407 62 00; fax: +90 236 314 4566; e-mail address: pinar.sari@cbu.edu.tr mainly the corrosion endurance of the reinforcement steel was investigated for construction, cerment, and chemical applications.…”

Section: Introductionmentioning

confidence: 99%

Ultra-high frequency induction welded process of reinforcement steel

Çavdar¹

2016

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Induction welding is developing as an alternative method to welding processes. In this study, two different welding processes were applied. One of them was ultra-high frequency induction welding (UHFIW), the other was electrode welding (EW). Additionally, S420 reinforcement steels (RS) were rapidly welded by ultra-high frequency induction system using a current at a frequency of 900 kHz and 2.8 kW power capacity. These steels are generally used in the construction of buildings. S420 RS were welded at 1100• C by induction for 5 min under an atmosphere environment. Alternatively, S420 RS were welded by the electrode. Mechanical properties and microhardness measurements were investigated for both processes. The results of the experimental studies were compared with each other. K e y w o r d s : induction, reinforcement steel, welding, ultra-high frequency

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Proposed criterion to assess the electrochemical behavior of carbon steel reinforcements under corrosion in carbonated concrete structures after patch repairs

Cited by 23 publications

References 11 publications

Compósitos de cimento Portland com adição de nanotubos de carbono (NTC): Propriedades no estado fresco e resistência à compressão

Compósitos de cimento Portland com adição de nanotubos de carbono (NTC): Propriedades no estado fresco e resistência à compressão

Performance of Concrete Patch Repairs: From a Durability Point of View

Ultra-high frequency induction welded process of reinforcement steel

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