Accelerated simulation of chloride ingress into concrete under drying–wetting alternation condition chloride environment

Yu, Zhiwu; Chen, Ying; Liu, Peng; Wang, Weilun

doi:10.1016/j.conbuildmat.2015.05.090

Cited by 115 publications

(26 citation statements)

References 22 publications

(28 reference statements)

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“…The specimens were left in the mold for 24 h and cured in saturated lime water for 28 days for the chloride resistance tests. The use of lime is to enhance the penetration of initial citrus source before testing to simulate the effect of chloride attack in the sample (Verma et al, 2013;Yu et al, 2015). After that, specimens were cut to obtain two samples of 25 mm thick from the middle of 50 Â 100 mm concrete cylinder using a diamond saw.…”

Section: Chloride Resistance Testmentioning

confidence: 99%

Compressive strength and chloride resistance of grout containing ground palm oil fuel ash

Mujah

2016

Journal of Cleaner Production

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Section: Chloride Resistance Testmentioning

confidence: 99%

Compressive strength and chloride resistance of grout containing ground palm oil fuel ash

Mujah

2016

Journal of Cleaner Production

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“…However, the chloride profile is very complicated under cyclic wet-dry environments. Instead of chloride decreasing monotonously with distance from the exposed surface increasing, a chloride concentration peak (as shown in Figure 1 [1]) was first discovered in 1993 [2,3] and was reported in other studies [4][5][6][7][8] successively. According to the recent researches [1,9,10], the chloride concentration peak is induced by the coupling effect of moisture hysteresis caused by alternate wet-dry and bound chloride releasing due to carbonation.…”

Section: Introductionmentioning

confidence: 64%

Influence of Pore Structure on Chloride Penetration in Cement Pastes Subject to Wetting-Drying Cycles

Chang

Zuo

et al. 2019

Advances in Materials Science and Engineering

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Copious studies have discovered a phenomenon that a chloride concentration peak appears on the surface of concrete under cyclic drying-wetting environments. In such cases, the chloride diffusion coefficient (D) obtained through directly fitting the standard error function of Fick's second law is no longer accurate. e more reliable D obtained by the method proposed by Andrade is employed in this research to investigate the influence of pore structure on chloride penetration rate of pastes. e results show that both the effective coefficient (D eff ) and the apparent coefficient (D app ) increase with total porosity, the most probable pore size, and water absorption porosity, suggesting that the increase of the three pore structure parameters accelerates chloride penetration rate under cyclic wetting-drying condition. e increase of the three parameters makes more room available and eases the difficulty for salt solution to enter the matrix and thus leads to the augmentation of chloride transporting in matrix.

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“…Yu et al [14] utilizou uma solução com concentração de 5% de NaCl durante 50 minutos para a molhagem do corpo de prova que também estava submetido a um vento de 3m/s, para simular a atmosfera de ambiente marinho, e o restante do tempo é de secagem, até totalizar 12 ou 30h de estudo.…”

Section: Ciclos De Molhagem E Secagemunclassified

“…Os ensaios de molhagem e secagem tiveram períodos de duração desde 12 a 30h [14], até 168 dias [12].…”

Section: Ciclos De Molhagem E Secagemunclassified

Corrosão acelerada uma revisão sobre os métodos de ensaio disponíveis

Monteiro¹,

Medeiros²

2017

Simpósio Paranaense De Patologia Das Construções

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Resumo: Estruturas de concreto armado estão sujeitas ao aparecimento de manifestações patológicas no decorrer do tempo. A corrosão é um processo de degradação e necessita de acompanhamento contínuo. Tentando prever o comportamento das estruturas frente a essa manifestação, os ensaios de corrosão acelerada são uma ferramenta de auxílio para obter resultados em um menor período de tempo, tendo em vista que o processo natural da corrosão geralmente leva anos para ocorrer. Os ensaios de corrosão acelerada não possuem um padrão dentro da comunidade científica. São realizados através de diversas metodologias, dificultando a comparação dos resultados. O objetivo desse artigo é apresentar e comparar as diferenças dos principais métodos nos ensaios de corrosão acelerada em corpos de prova de concreto armado. Em algumas das metodologias encontradas, foram utilizados corpos de prova submersos em solução salina, para aplicação de corrente elétrica externa, de modo que os cloretos migrem pelo efeito da diferença de potencial. Nesse caso, os autores divergem nas definições das concentrações e dos tipos de sais a serem dissolvidos na solução, e nas intensidades da corrente elétrica. Em outras metodologias são utilizado ciclos de molhagem e secagem na amostra, e também a inserção de sais no concreto fresco. Nesses casos é possível variar a porcentagem de íons cloretos, tempo dos ciclos de molhagem e secagem, e a concentração salina que o corpo de prova é submetido no processo de molhagem. Os ensaios podem se diferenciar pelas características do concreto armado ensaiado como traço, fator a/c e tipo de cimento. Palavras-chave: concreto armado, manifestação patológica, corrosão acelerada, métodos de ensaioAbstract: Reinforced concrete structures are subject to the appearance of pathological manifestations over time. Corrosion is an aggressive degradation process and requires continuous monitoring. Trying to predict the structure behavior of this manifestation, the accelerated corrosion tests are a support tool to get results in a shorter period of time, considering that the natural process of corrosion usually take years to occur. Accelerated corrosion tests do not have a standard within the scientific community. They are made through various methodologies, making it difficult a possible comparison of results. The purpose of this article is to introduce and compare the differences of the main methods for the testing of accelerated corrosion in reinforced concrete specimens. In some methodologies, test specimens are submerged in a saline solution for applying an external electric current, so that the chlorides migrate by effect of the potential difference. In this case, the authors differ from the definitions of concentrations and types of salts to be dissolved in the solution and intensity of electric current. In others methodologies are used a wetting and drying cycles in the sample and the inclusion of salt in the fresh concrete. In these cases, it is possible to vary the percentage of chloride ions, the time of the wetting and ...

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Accelerated simulation of chloride ingress into concrete under drying–wetting alternation condition chloride environment

Cited by 115 publications

References 22 publications

Compressive strength and chloride resistance of grout containing ground palm oil fuel ash

Compressive strength and chloride resistance of grout containing ground palm oil fuel ash

Influence of Pore Structure on Chloride Penetration in Cement Pastes Subject to Wetting-Drying Cycles

Corrosão acelerada uma revisão sobre os métodos de ensaio disponíveis

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