Electrical properties of cement-based materials: Multiscale modeling and quantification of the variability

Honório, Túlio; Carasek, H.; Cascudo, O.

doi:10.1016/j.conbuildmat.2020.118461

Cited by 21 publications

(29 citation statements)

References 64 publications

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“…The ion-ion and ion-water contributions are shown. Our results are in agreement with the static conductivity reported for ordinary PC systems with a water-to-cement ratio of w/c =0.4, which can be described by a single master curved weighted by the w/c as discussed by Honorio et al [37]. The conductivities of the pore solutions are similar to the static value up to frequencies on the order of 10 GHz.…”

Section: A Dielectric Spectrasupporting

confidence: 92%

“…such classification has been useful in linking the dynamics of ions to the electrical properties of cement-based materials [37]. As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

“…We observe that the Cole-Cole equation fits well the dielectric spectra obtained for all pore solutions. Finally, we quantify the effect of the variability of the dielectric response of the pore solution on the effective response of cement-based materials using Monte Carlo Micromechanics [37]. Our results contribute to a better understanding of the electromagnetic behavior of cement-based materials and can be readily used in the interpretation of dielectric probing of cement-based materials, enhancing the performance of HF-EM testing and improving the confidence in the corresponding results.…”

Section: Introductionmentioning

confidence: 93%

“…The homogenization of the dielectric permittivity and electrical conductivity is analogous to the homogenization of the thermal conductivity and diffusivity [20]. Bruggeman (or the self-consistent) scheme has been shown to provide a good estimate of the effective electrical conductivity of cement-pastes by capturing the transition from a liquid to a solid matrix during cement hydration [37].…”

Section: Upscaling the Effects Of The Variability Pore Solution DImentioning

confidence: 99%

“…the volume fraction associated to the pore solution phase) in the system: (18) where the degree of hydration ξ can be described by the sigmoid ξ = 0.9 [1 − Exp (−t/7)] for t in days as in ref. [37], and φ 0 cap (w/c) = (w/c)/ (ρ w /ρ c + (w/c)) is the initial porosity computed from the w/c and densities of water and cement (ρ c and ρ w , respectively). It is worth to note that this approach does not take into account interface processes that will dominate the spectra around kHz and MHz range [46,47].…”

Section: Upscaling the Effects Of The Variability Pore Solution DImentioning

confidence: 99%

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Dielectric properties of the pore solution in cement-based materials

Honório

Boré

Benboudjema

et al. 2020

Journal of Molecular Liquids

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Dielectric properties are intimately related to the content and composition of the liquid phase present in micro-and mesoporous materials. The presence of ions is recognized to affect the dielectric response of electrolytes in a complex way that depends on the ion-water and ion-ion interactions and respective concentrations. Pore solutions in cement-based materials are complex and age-dependent exhibiting different ion pair states, which make them an interesting candidate for the study of the complex pore solution found in geomaterials in general. Here, we study the dielectric properties of bulk aqueous solutions representative of the pore solution found in cement-based materials using molecular dynamics simulations. Broadband dielectric spectra and frequency-dependent conductivities are provided. A mean field upscaling strategy is deployed to compute the dielectric response at cement-paste scale. In cement-based materials, the measurement of dielectric properties can be used for non-destructive monitoring of concrete structures conditions and to unravel details of the hierarchical pore structure of the material, notably at early-age when the microstructure of the material changes significantly. Our results can be used in the interpretation of high frequency electromagnetic methods, such as ground-penetrating radar, enhancing the quality of interpretation and improving the confidence in the corresponding results.

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Section: A Dielectric Spectrasupporting

confidence: 92%

“…such classification has been useful in linking the dynamics of ions to the electrical properties of cement-based materials [37]. As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 93%

Section: Upscaling the Effects Of The Variability Pore Solution DImentioning

confidence: 99%

Section: Upscaling the Effects Of The Variability Pore Solution DImentioning

confidence: 99%

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Dielectric properties of the pore solution in cement-based materials

Honório

Boré

Benboudjema

et al. 2020

Journal of Molecular Liquids

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CSI (Cement Science Investigation): Using Machine Learning to Guess the OPC Pastes Composition from the Elastic Response

2021

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Precise prediction of the elastic response is crucial to model cracking at early and late ages of cement-based materials and structures. Here, we use Machine Learning (ML) techniques to predict the elastic properties of Ordinary Portland Cement (OPC) pastes. A database with 365 observations is built on experimental studies from in the literature. We show that micromechanicsbased estimations may provide missing data in databases to be interrogated by ML, increasing the accuracy of predictions. Finally, we explore the formulation space of OPC pastes using Monte Carlo computations, which enables guessing which are the compositions that can be associated with a given elastic response. Applications of our results include the development of tailored formulations for a target elastic response and also in the forensics of existing cement pastes.

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Electromagnetic Properties of Concrete: Bottom-Up Modeling from the Molecular Scale

et al. 2021

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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Electrical properties of cement-based materials: Multiscale modeling and quantification of the variability

Cited by 21 publications

References 64 publications

Dielectric properties of the pore solution in cement-based materials

Dielectric properties of the pore solution in cement-based materials

CSI (Cement Science Investigation): Using Machine Learning to Guess the OPC Pastes Composition from the Elastic Response

Electromagnetic Properties of Concrete: Bottom-Up Modeling from the Molecular Scale

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