Effective medium theories in electromagnetism for the prediction of water content in cement pastes

Guihard, Vincent; Patapy, Cédric; Sanahuja, Julien; Balayssac, Jean-Paul; Taillade, Frédéric; Steck, B.

doi:10.1016/j.ijengsci.2020.103273

Cited by 25 publications

(4 citation statements)

References 28 publications

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“…The ! ' of mortar improves significantly with the addition of CB and different content of WIP, which is aligned with the Boltzmann effective medium theory (Eq.4) [27][28][29][30]. However, the tan!…”

Section: Materials Library Datasupporting

confidence: 83%

Optimization with a Genetic Algorithm for Multilayer Electromagnetic Wave Absorption Cement Mortar Filled with Expended Perlite

Xie

et al. 2023

J. Mater. Sci. Technol. Res.

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Due to the complexity of the design of multilayer electromagnetic (EM) wave absorbing materials, it is difficult to establish the relationship between material parameters (type and filling ratios) and EM properties using traditional trial and error methods. Based on the measured EM parameters within a few materials and Boltzmann mixing theory, a database of EM parameters was thereafter built up. In this study, the genetic algorithm (GA) was used to design the multilayer wave-absorbing cement mortar. In order to verify this method, a multilayer mortar was fabricated and measured. The simulated and measured results are well consistent, which convincingly verifies computer-aided design. In addition, the optimized result expresses that the first layer as a matching layer guides EM waves into the interior of the material, while the other layers as absorption layers attenuate EM waves. The multilayer material may not meet the impedance gradient principle but still exhibits better EM wave absorption performance. The reflection loss (RL) of all optimized three layer sample is below –6.89 dB in the full frequency band and the minimum RL is –26.21 dB. This composite absorbing material and the GA method provide more design ideas for the design of future cement-based wave-absorbing materials and save a lot of time and material cost.

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Section: Materials Library Datasupporting

confidence: 83%

Optimization with a Genetic Algorithm for Multilayer Electromagnetic Wave Absorption Cement Mortar Filled with Expended Perlite

Xie

et al. 2023

J. Mater. Sci. Technol. Res.

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“…This effective-medium approach is similar (although not identical) to the one used in ref to study the terahertz response of cementitious samples.…”

Section: Theoretical Calculationsmentioning

confidence: 98%

Radiative Cooling Properties of Portlandite and Tobermorite: Two Cementitious Minerals of Great Relevance in Concrete Science and Technology

Dolado

Goracci

Arrese-Igor

et al. 2023

ACS Appl. Opt. Mater.

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Although concrete and cement-based materials are the most engineered materials employed by mankind, their potential for use in daytime radiative cooling applications has yet to be fully explored. Due to its complex structure, which is composed of multiple phases and textural details, fine-tuning of concrete is impossible without first analyzing its most important ingredients. Here, the radiative cooling properties of Portlandite (Ca(OH)2) and Tobermorite (Ca5Si6O16(OH)2·4H2O) are studied due to their crucial relevance in cement and concrete science and technology. Our findings demonstrate that, in contrast to concrete (which is a strong infrared emitter but a poor sun reflector), both Portlandite and Tobermorite exhibit good radiative cooling capabilities. These results provide solid evidence that, with the correct optimization of composition and porosity, concrete can be transformed into a material suitable for daytime radiative cooling.

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“…The fourthorder tensor S Esh is called Eshelby tensor and depends on the elasticity of the medium and the shape and orientation of the ellipsoid. Note that in some literature the Eshelby tensor is sometimes named depolarization tensor (see for instance [36] or [37] in the framework of electromagnetism which is mathematically analogous to elasticity). Another equivalent point of view consists in introducing the prestress p = −C : ε * instead of the eigenstrain, which implies that the uniform strain within the ellipsoid then writes −P : p. The fourth-order tensor P = S Esh : C −1 is often called Hill polarization tensor ( [38], [39], [40]).…”

Section: Problem Of a Single Ellipsoidal Inclusion In An Eo Matrix An...mentioning

confidence: 99%

Micromechanical modeling of a cracked elliptically orthotropic medium

Barthélémy

Sevostianov

Giraud

2021

International Journal of Engineering Science

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Effective medium theories in electromagnetism for the prediction of water content in cement pastes

Cited by 25 publications

References 28 publications

Optimization with a Genetic Algorithm for Multilayer Electromagnetic Wave Absorption Cement Mortar Filled with Expended Perlite

Optimization with a Genetic Algorithm for Multilayer Electromagnetic Wave Absorption Cement Mortar Filled with Expended Perlite

Radiative Cooling Properties of Portlandite and Tobermorite: Two Cementitious Minerals of Great Relevance in Concrete Science and Technology

Micromechanical modeling of a cracked elliptically orthotropic medium

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