A multi-scale material model for the estimation of the transversely isotropic thermal conductivity tensor of fired clay bricks

Contribution of FE and FFT-based methods to the determination of the effective elastic and conduction properties of composite media with flat inclusions and infinite contrast

“…It should be recalled that the resulting choice of a scheme only holds here in the context of parallel disks, and other cases should be investigated independently. From the theoretical standpoint, random and axisymmetric distributions of disks have indeed already been investigated in the past, and the interested reader is referred to Fritsch et al [19] for mechanical properties, and to Abdalrahman et al [1] and Kiefer et al [26] for transport properties. Indeed, the 𝑂 (1) term of its expansion in powers of 𝑋 reads Λ 4 (𝒏) = C 0 − C 0 : Γ 4 (𝒏) : C 0 , but then:…”

EDX/XRD-based identification of micrometer-sized domains in scanning electron micrographs of fired clay

“…The latter proved as very suitable for this purpose, in the context of various construction materials. With the presented identification of the material phases and their morphology, the first step towards such a physically based multiscale material model able to estimate macroscopic elastic and thermal properties of fired clay [26] is taken.…”

“…For further sample preparation, the main objective was to obtain a surface of the sample as smooth as possible, which is due to various reasons: obviously, a smooth surface allows for high quality pictures, and ensures that no material phases are quarried out during polishing and get lost during analysis. Furthermore, after scanning the samples with the SEM-EDX, a huge set of measurements will be carried out (and discussed in a subsequent series of papers) on the prepared samples to identify the elastic and thermal properties of the determined material phases by means of nanoindentation [25] and scanning thermal microscopy [26], both methods requiring a very smooth surface to ensure high quality results [27,28]. Therefore, the samples underwent an extensive polishing protocol (realised with machine PM5, Logitech, Scotland).…”

Effects of water content and salinity on the porosity structure and resistivity of loess soil sintered at 1000 °C

“…The water content and soluble salt content of loess are highly sensitive to temperature (Lyu et al 2019). When the loess is baked at high temperature, the pore structure changes, which directly affects the strength and physical properties of loess (Kiefer et al 2020;Ruan et al 2020;Teixeira et al 2020).…”