Characteristic lengths of the carbonation front in naturally carbonated cement pastes: Implications for reactive transport models

Georget, Fabien; Soja, Wioletta; Scrivener, Karen

doi:10.1016/j.cemconres.2020.106080

Cited by 38 publications

(11 citation statements)

References 17 publications

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“…However, SEM-EDS can be used to analyse the element segregation around the carbonation front as a proxy to measure the critical sizes of the transition zones. 7 The interface steel-concrete and the apparition of the corrosion products can also be analysed. 48 Cracks are also an important feature of cementitious materials.…”

Section: Morphology and Microstructure Descriptorsmentioning

confidence: 99%

A critical catalogue of SEM‐EDS multispectral maps analysis methods and their application to hydrated cementitious materials

Georget,

Schmatz,

Wellmann

et al. 2023

Journal of Microscopy

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Many methods have been proposed to analyse SEM‐EDS hypermaps of hydrated cementitious materials but none can fit all purposes. In this presentation, we review existing methods for phase identification, stoichiometry quantification, and microstructure quantification in cementitious materials and related materials. We first discuss the unique contribution of SEM‐EDS with respect to the outstanding scientific challenges towards sustainable construction materials. We then compare the SEM‐EDS and image analysis techniques which contribute to answering these challenges. Convergence and divergence in current methods and workflows, and knowledge gaps are highlighted in terms of the specificities of the material (phase assemblage complexity, grain sizes, mixtures, etc.). The discussion is weighted by the required expert knowledge for the sample preparation, microscope operation, and data analysis. We conclude by discussing how microscopy and image analysis integrate into the overall experimental toolkit to investigate and improve cementitious materials.

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Section: Morphology and Microstructure Descriptorsmentioning

confidence: 99%

A critical catalogue of SEM‐EDS multispectral maps analysis methods and their application to hydrated cementitious materials

Georget,

Schmatz,

Wellmann

et al. 2023

Journal of Microscopy

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“…The reduction in alkalinity leads to depassivation of the reinforcement so that it is no longer protected from corrosion [2]. Significant research has been carried out, comprising experimental investigation on carbonation mechanism [3], theoretical models proposed to predict carbonation depth of concrete based on experimental results [4], its practical application and life prediction models [5]. Seigneur et al [6] used fully coupled two-phase reactive transport modeling focusing on the hydrated C3S paste and low-pH paste of the concrete.…”

Section: Introductionmentioning

confidence: 99%

Reinforced Concrete Durability Design Through a Semi-probabilistic Approach

Paulpandian

Neves

2023

Period. Polytech. Civil Eng.

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This study provides a semi-probabilistic approach to durability design of reinforced concrete structures, subjected to carbonation-induced corrosion. The method was developed from an existing approach and using comprehensive data collated from the literature. A statistical model for predicting accelerated carbonation coefficient, using as input variables mix proportions and test conditions was also generated. The performance of the proposed method was assessed and proved appropriate. Besides delivering a more consistent semi-probabilistic method to design for the avoidance of unforeseen carbonation-induced corrosion problems, the developed statistical model to estimate the accelerated carbonation coefficient is a useful tool on the mix design, from the standpoint of conforming with the accelerated carbonation coefficients obtained through the semi-probabilistic method.

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“…Therefore, the integrity of the structure would not only be limited by the stability of the concrete matrix, but also by the durability of the metallic reinforcement. Corrosion of steel embedded in concrete is caused by two processes: (1) carbonation occurs when the atmospheric CO 2 reacts with the concrete matrix forming carbonates and reducing the pH of the concrete, leading to uniform corrosion, and (2) chloride-induced corrosion that comprises the ingress of chloride ions, through the matrix promoting local acidification and causing pitting corrosion [15,16].…”

Section: Introductionmentioning

confidence: 99%

Influence of Thermomechanical Treatments on Corrosion of Carbon Steel in Synthetic Geopolymer Fly Ash Pore Solution

et al. 2021

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In this study the effect of thermomechanical treatments in chloride induced pitting corrosion is presented for carbon steel rebars exposed to synthetic fly ash (FA) pore solution. Due to the likely phase transformations that steel reinforcements in concrete experience during the event of a fire, the understanding of the corrosion behavior of such phases is key in predicting the stability of the structure. The motivation for this study arrives from the scarce literature regarding the corrosion behavior of thermomechanically treated steel reinforcements in FA environments and the need for further investigation to understand its mechanism. In order to better understand the effects on the corrosion behavior electrochemical measurements including cyclic potentiodynamic polarization curves (CPP) and electrochemical impedance spectroscopy (EIS) were used. It was found that quenched specimens showed enhanced corrosion kinetics as their icorr values were higher, being of 3.18 × 10−5 and 2.20 × 10−5 A/cm2 for water and oil quenched compared to 2.13 × 10−6 A/cm2 for the as-received. Furthermore, the effective capacitance of the double layer (Ceff,dl) showed the lower stability of the passive film for the quenched specimens, with values of 1.11 × 10−3 µF/cm2 for the as-receive sample that decreased to 8.12 × 10−4 µF/cm2 for the water quenched sample. The anodic charge transfer coefficient in the synthetic FA alkaline pore solution changes from 0.282 to 0.088, for the as-received and water quenched rebars specimens, respectively. These results indicate a lower energy barrier for the anodic dissolution reaction of quenched specimens, indicating that martensite and bainite microstructures promote corrosion process. Enhanced corrosion was found on quenched samples presenting martensite and bainite microstructure as showed by the increased pith depth, with values of 5 μm compared to 1 μm observed in the as-received samples.

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Characteristic lengths of the carbonation front in naturally carbonated cement pastes: Implications for reactive transport models

Cited by 38 publications

References 17 publications

A critical catalogue of SEM‐EDS multispectral maps analysis methods and their application to hydrated cementitious materials

A critical catalogue of SEM‐EDS multispectral maps analysis methods and their application to hydrated cementitious materials

Reinforced Concrete Durability Design Through a Semi-probabilistic Approach

Influence of Thermomechanical Treatments on Corrosion of Carbon Steel in Synthetic Geopolymer Fly Ash Pore Solution

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