Long-term chloride-induced corrosion monitoring of reinforced concrete coated with commercial polymer-modified mortar and polymeric coatings

Brenna, Andrea; Bolzoni, F.; Beretta, Silvia; Ormellese, Marco

doi:10.1016/j.conbuildmat.2013.07.099

Cited by 82 publications

(51 citation statements)

References 14 publications

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“…Desse modo, de acordo com Medeiros e Helene [6], Diamanti et al [7] e Brenna et al [8], em uma estrutura em que o processo de corrosão já está instalado, a proteção de superfície apresenta efeito de redução da velocidade de corrosão devido ao seu poder de reduzir a absorção de água do concreto armado. Com a restrição do ingresso de água, a cinética do processo de corrosão pode ser reduzida drasticamente em função da magnitude da capacidade do sistema de proteção de superfície em reduzir a absorção de água do sistema.…”

Section: Proteção De Superfície Sobre Concreto Armadounclassified

Avaliação da eficiência de sistemas de proteção de superfície para concreto: absorção de água, migração de cloretos e ângulo de contato

Medeiros¹,

Pereira²,

Figura³

et al. 2015

Matéria (Rio J.)

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RESUMOA camada de cobrimento do concreto funciona como uma barreira natural ao ingresso de agentes agressivos para o interior do material, dificultando a penetração de íons cloretos, reduzindo a absorção de água e limitando o acesso de oxigênio. Para garantir a eficiência desta camada protetora o uso de tratamentos de superfí-cie mostra-se como uma alternativa viável para prolongar o período de proteção proporcionado pelo cobrimento do concreto. O objetivo deste trabalho é estudar o efeito de proteção de quatro produtos disponíveis no mercado para ser aplicados na proteção de superfície de concretos (cimento quartzoso, epóxi, silicatos, silano/siloxano), bem como comparar os métodos usados para investigar a eficiência de sistemas de proteção. Para isto procedeu-se sobre corpos de prova de concreto, ensaios de absorção por sucção capilar, resistência à penetração de cloretos por migração de íons e medição do ângulo de contato com a água sobre a superfície de concreto protegida ou não. Os produtos estudados apresentaram a capacidade de modificar a interação entre a água e a superfície de contato do concreto. Dentre os produtos estudados, o epóxi é o que apresenta a maior resistência à penetração de cloretos, menor absorção de água por capilaridade e caráter hidrófugo. Com exceção dos silicatos, verificou-se ainda uma boa correlação entre os resultados de absorção de água por capilaridade e o ensaio de migração de íons cloretos. Os produtos Epóxi e a base de silicatos, que apresentaram os menores valores de sortividade, foram os que apresentaram os maiores valores de ângulo de contato, sendo classificados como os de menor afinidade com a água. Palavras-chave:Proteção de superfície, Durabilidade, Concreto armado, Cloretos. ABSTRACTThe thickness of concrete cover acts as a natural protective barrier to the ingress of aggressive agents into the material, hindering the penetration of chloride ions, reducing water absorption and by limiting access of oxygen. To ensure the efficiency of this protective coat the use of surface treatments presents as a viable alternative to extend the period of protection provided by the concrete cover. The aim of this study is to evaluate the protective effect of four products available on the market to be applied on the surface protection of concrete (concrete sealers, epoxy, silicates and silane/siloxane) and compare the methods used to investigate the efficiency of protection systems. Absorption test by capillary suction, chloride penetration resistance by migration of ions and measuring the contact angle with water on the surface of protected concrete were executed. The studied products presented the ability to modify the interaction between the water and the contact surface of the concrete. With the exception of silicate, it was verified a good correlation between the results of water absorption by capillary and chloride ions migration. Among the studied products, the epoxy presents the highest resistance to chloride penetration, lower water absorption by capillarity and water repell...

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Section: Proteção De Superfície Sobre Concreto Armadounclassified

Avaliação da eficiência de sistemas de proteção de superfície para concreto: absorção de água, migração de cloretos e ângulo de contato

Medeiros¹,

Pereira²,

Figura³

et al. 2015

Matéria (Rio J.)

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“…Different coatings correspond to different protective mechanisms and protective efficacies, and these coatings, including organic coatings and inorganic polymers (geopolymer), have been widely studied and compared. These surface coatings were proved effective in varying degrees in improving concrete durability by artificial wetting and drying cycles (Almusallam, Khan, Dulaijan, & Al-Amoudi, 2003;Brenna, Bolzoni, Beretta, & Ormellese, 2013;Li, Yang, Guo, Du, & Wu, 2015;Moon, Shin, & Choi, 2007) or naturally exposed to marine environment (Medeiros & Helene, 2009;Moradllo, Shekarchi, & Hoseini, 2012;Rodrigues, Costa, Mendes, & Marques, 2000;Zhang, Yao, & Wang, 2012). However, few reports focus on the durability of structures under loadings in situ with surface coatings.…”

Section: Introductionmentioning

confidence: 99%

Chloride Penetration in Surface-Treated Concrete in Natural and Accelerated Environments

Dong¹,

Zhao²,

Pu³

et al. 2016

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

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This study investigated the chloride penetration of surface-treated concrete in natural and accelerated environments. A part of a real concrete port, including the beams and the columns, was investigated. Concrete specimens cast together with the concrete port were transported to the lab and subjected to wetting and drying cycles for accelerating the ingression of chloride ion. Chloride concentration of the specimens in the lab and the components in situ was tested. The results show that the surface treatments obviously slow down the chloride penetration into the concrete in both lab and in situ. The chloride penetration in situ is more severe than that in specimens under wetting and drying cycles. For the components of the real concrete port, the chloride concentration tested in summer is found higher than that in winter and the chloride concentration in the tensile region of bending beam is higher than that in the column.

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“…The most used portable electrode is the copper/copper sulphate reference electrode (CSE), consisting in a copper rod immersed in a saturated copper sulphate solution. It is typically used in potential mapping, the only recognized and standardizes non-destructive technique for a direct assessment of reinforcement corrosion [7,[18][19]. American standard ASTM C876 [18] describes the procedure to perform a potential mapping and it gives a guideline to interpret the readings.…”

Section: Introductionmentioning

confidence: 99%

“…The measurement of the free corrosion potential is essential to monitor the corrosion process of reinforcing steel in concrete [7,[16][17][18]. Rebar potential is measured with respect a portable or embedded reference electrode by means of a high impedance voltmeter (>10 MO).…”

Section: Introductionmentioning

confidence: 99%

“…In very severe working condition, if a very long service life is required, additional protection techniques may be used, such as corrosion resistant bars, concrete coating, corrosion inhibitors, cathodic protection or prevention [6][7][8]. Prevention of corrosion continues throughout the entire service life of the structure with scheduled inspection, maintenance and above all monitoring [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

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Monitoring chloride-induced corrosion of carbon steel tendons in concrete using a multi-electrode system

Brenna

Lazzari

Ormellese

2015

Construction and Building Materials

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h i g h l i g h t sA novel multi-reference-electrode (MuRE) was proposed and studied. Nickel and stainless steel were the more stable metals for the reference electrode. The MuRE is able to detect and locate the chloride-induced corrosion. The proper length of each wire is influenced by the cover and the resistivity. The maximum allowable length/cover ratio to detect the localized corrosion is 50. To monitor real-time the occurrence of localized corrosion in reinforced concrete structures a novel multi-reference electrode is proposed, consisting of a series of metallic wires placed head-to-tail able to measure the corrosion potential of a carbon steel tendon or a rebar network. Available embeddable or portable reference electrodes give the local potential of the rebar; with the new system, a single potential reading can give the corrosion condition of a wide area. Copper, nickel and stainless steel were tested as candidate metallic materials: laboratory tests allow verifying their stability in alkaline condition. The ability to detect and locale corrosion was demonstrated on mortar and grout specimens, cast to simulate chloride-induced corrosion on post-tensioned tendons. a r t i c l e i n f o

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Long-term chloride-induced corrosion monitoring of reinforced concrete coated with commercial polymer-modified mortar and polymeric coatings

Cited by 82 publications

References 14 publications

Avaliação da eficiência de sistemas de proteção de superfície para concreto: absorção de água, migração de cloretos e ângulo de contato

Avaliação da eficiência de sistemas de proteção de superfície para concreto: absorção de água, migração de cloretos e ângulo de contato

Chloride Penetration in Surface-Treated Concrete in Natural and Accelerated Environments

Monitoring chloride-induced corrosion of carbon steel tendons in concrete using a multi-electrode system

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