Corrosion performance of blended concretes exposed to different aggressive environments

Aguirre-Guerrero, Ana María; Mejía-de-Gutiérrez, Ruby; Correia, M.J.

doi:10.1016/j.conbuildmat.2016.06.038

Cited by 54 publications

(19 citation statements)

References 52 publications

(85 reference statements)

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“…Thus, as concrete is a porous composite material, the penetration of aggressive ions into concrete depends mainly on the microstructure and the chemistry of the mixture [202]. The existence of metakaolin changes the mix design and affects concrete corrosion resistance [201][202][203][204][205]. When chloride concentration increases, the corrosion current density increases, and concrete become more vulnerable to corrosion [201].…”

Section: Effect Of Clay On the Steel Corrosionmentioning

confidence: 99%

Clay as a Sustainable Binder for Concrete—A Review

Mousavi

Bhojaraju²,

Ouellet-Plamondon

2021

Construction Materials

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The negative environmental impacts of Portland cement as a binder in the construction industry have created a growing impetus to develop sustainable alternative binders. Various types of clay have been considered as potential cement replacements. The impact of clays as cement replacement depends on the dosage and treatment methods. This paper presents a comprehensive review to determine the effects of different types of clay on the fresh and hardened properties of concrete mixtures by analyzing the experimental database reported by the literature, including raw, calcined, modified, nano, and organo. This study intends to show the process of optimizing the use of clay in concrete, the reason behind converting raw clay to modified types, and research gaps through a comparison study between different types of clays. The present review study shows that clay-based concrete mixtures have higher thixotropy and yield stress values, improving shape stability. This results in lower early-age shrinkage of the concrete. However, the high floc strength of clay-based concrete causes a reduction in flowability. Treatment methods of raw clay, such as calcination and nano-sized clay particles, improve concrete compressive strength. General results of the previous studies highlight that all types of clay investigated positively affect the resistance of concrete to environmental attack.

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Section: Effect Of Clay On the Steel Corrosionmentioning

confidence: 99%

Clay as a Sustainable Binder for Concrete—A Review

Mousavi

Bhojaraju²,

Ouellet-Plamondon

2021

Construction Materials

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“…Eq. (13) has been widely used in civil engineering projects to give a rapid corrosion evaluation of steel reinforcement as it does not require measurements of the other electrokinetic parameters such as Tafel constants [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

“…free and bound chloride. Aguirre-Guerrero et al [20] reported that bound chloride is chemically or physically attached to the cement hydration products and only free chloride ions in the concrete pore solution are responsible for the depassivation of steel reinforcement. Free chloride ions in the concrete pore solution can be measured by squeezing concrete samples at a high pressure [32].…”

Section: Introductionmentioning

confidence: 99%

Stray current induced corrosion of steel fibre reinforced concrete

Tang

2017

Cement and Concrete Research

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Stray current induced corrosion is a major technical challenge for modern electric railway systems. The leakage of stray current to surrounding reinforced concrete structures can lead to steel reinforcement corrosion and the subsequent disintegration of concrete. Steel fibre reinforced concrete has been increasingly used as the railway tunnel lining material but it is not clear if discrete steel fibres can still pick up and transfer stray current in the same way as conventional steel reinforcement and lead to similar corrosion reactions. The corrosion behaviour of steel fibres was investigated through voltammetry tests and electrochemical impedance spectroscopy. The presence of high concentration chloride ions was found to increase the pitting corrosion tendency of steel fibres in simulated concrete pore solutions and mortar specimens. The chloride threshold level for corrosion of steel fibres in concrete is approximately 4% NaCl (by mass of cement) which is significantly higher than that of conventional steel reinforcement

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“…During the carbonation reaction, Ca(OH)2 is gradually converted into CaCO3, which reduces the alkalinity of the concrete. Hence, the carbonation of OPC-based concrete makes the reinforcement more vulnerable to corrosion [14]. Carbonation reaction leads to a reduction in total porosity as the molar volume of the reaction product CaCO3 is higher (36.93 cm 3 /mol) than the primary reactant Ca(OH)2 (32.29 cm 3 /mol) [7,15].…”

Section: Introductionmentioning

confidence: 99%