Predicting the chloride diffusion coefficient and surface electrical resistivity of concrete using statistical regression-based models and its application in chloride-induced corrosion service life prediction of RC structures

Homayoonmehr, Reza; Rahai, Alireza; Ramezanianpour, Ali Akbar

doi:10.1016/j.conbuildmat.2022.129351

Cited by 20 publications

(3 citation statements)

References 47 publications

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“…Recently, several researchers have conducted extensive studies and attempted to reveal the diffusion process of chloride within concrete using laboratory characterization and numerical simulation [15][16][17][18]. Wu et al [19] presented a study on the durability testing of a concrete facility located within the North Bay Port region and in service for 200 months.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study on Chloride Transport in Unsaturated Concrete: Highlighting Temperature, Humidity, and Mineral Admixtures

Du,

Jin,

et al. 2024

Materials

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Chloride transport within concrete is critical for the durability of reinforced concrete structures; however, its diffusion under the coupling action of temperature and humidity has not been fully comprehended. Therefore, in this work, the coupling effects of temperature, relative humidity, and mineral admixtures on chloride transport in concrete were investigated through experimental and numerical simulation work. The results show that the chloride diffusion coefficient decreases with the decreased temperature and growth of relative humidity; however, the chloride concentration on the concrete surface is increased with the growth of temperature and relative humidity. Moreover, compounding about 15% fly ash (FA) and 30% granulated ground blast furnace slag (GGBS) to replace the cement is the most beneficial for improving the antichloride capacity of concrete, considering also the strength. In addition, the numerical simulation considering the coupled effect of temperature and relative humidity of chloride transport in concrete has good agreement with that of experimental results.

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Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study on Chloride Transport in Unsaturated Concrete: Highlighting Temperature, Humidity, and Mineral Admixtures

Du,

Jin,

et al. 2024

Materials

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“…The corrosion of embedded reinforcement in reinforced concrete structures is one of the most pervasive global durability challenges [17][18][19][20][21]. The utilization of clay-based SCMs can compromise the durability of concrete materials due to the reduced alkalinity of the pore solution chemistry which is an important factor in arresting chloride-induced electrochemical corrosion of embedded reinforcement [22,23].…”

Section: Introductionmentioning

confidence: 99%

“…Recent research has shown that while Fe (II)/Fe (III) chloride complexes may negligibly increase the solubility of iron, the temporary formation of nano-sized particles of chloride green rust, GR (Cl − ), as stabilized by Ph and O 2 conditions, can mediate the transport and precipitation of iron rust products far from the steel-concrete interface [25]. These recent findings add complexity to the simplified understanding of electrochemical corrosion which has often relied on simplified critical chloride thresholds (C crit ) to indicate the start of the passive layer breakdown and subsequent deleterious corrosion [21,[26][27][28]. Thus, further work is needed to understand the stabilization of GR (Cl − ) products in relation to the steel-concrete interface characteristics [29].…”

Section: Introductionmentioning

confidence: 99%

A Review on the Effect of Metakaolin on the Chloride Binding of Concrete, Mortar, and Paste Specimens

et al. 2022

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Chloride binding is a complex phenomenon in which the chloride ions bind with hydrated Portland cement (PC) phases via physical and chemical mechanisms. However, the current utilization of clays as (Al)-rich supplementary cementitious materials (SCMs), such as metakaolin (MK), can affect the chloride-binding capacity of these concrete materials. This state-of-the-art review discusses the effect of clay-based SCMs on physical and chemical chloride binding with an emphasis on MK as a high-reactivity clay-based SCM. Furthermore, the potential mechanisms playing a role in physical and chemical binding and the MK effect on the hydrated cement products before and after exposure to chloride ions are discussed. Recent findings have portrayed competing properties of how MK limits the physical chloride-binding capacity of MK-supplemented concrete. The use of MK has been found to increase the calcium silicate hydrates (CSH) content and its aluminum to silicon (Al/Si) ratio, but to reduce the calcium to silicon (Ca/Si) ratio, which reduces the physical chloride-binding capacity of PC-clay blended cements, such as limestone calcined clay cements (LC3). By contrast, the influence of MK on the chemical chloride capacity is significant since it increases the formation of Friedel’s salt due to an increased concentration of Al during the hydration of Portland cement grains. Recent research has found an optimum aluminum to calcium (Al/Ca) ratio range, of approximately 3 to 7, for maximizing the chemical binding of chlorides. This literature review highlights the optimal Al content for maximizing chloride binding, which reveals a theoretical limit for calcined clay addition to supplementary cementitious materials and LC3 formulations. Results show that 5–25% of replacements increase bound chloride; however, with a higher percentage of replacements, fresh and hardened state properties play a more pivotal role. Lastly, the practical application of four binding isotherms is discussed with the Freundlich isotherm found to be the most accurate in predicting the correlation between free and bound chlorides. This review discusses the effects of important cement chemistry parameters, such as cation type, sulfate presence, carbonation, chloride concentration, temperature, and applied electrical fields on the chloride binding of MK-containing concretes—important for the durable formulation of LC3.

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Influence of chloride acceleration methods on the electrochemical behaviour of superplasticiser admixed reinforced cementitious systems

Hemalatha,

Mohammed,

Vijayaraghavan

et al. 2024

Asian J Civ Eng

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Predicting the chloride diffusion coefficient and surface electrical resistivity of concrete using statistical regression-based models and its application in chloride-induced corrosion service life prediction of RC structures

Cited by 20 publications

References 47 publications

Experimental and Numerical Study on Chloride Transport in Unsaturated Concrete: Highlighting Temperature, Humidity, and Mineral Admixtures

Experimental and Numerical Study on Chloride Transport in Unsaturated Concrete: Highlighting Temperature, Humidity, and Mineral Admixtures

A Review on the Effect of Metakaolin on the Chloride Binding of Concrete, Mortar, and Paste Specimens

Influence of chloride acceleration methods on the electrochemical behaviour of superplasticiser admixed reinforced cementitious systems

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