RL5 – Civil Engineering
XCT @ Transport in Porous Materials research group (Department of Civil Engineering, KU Leuven)
XCT provides 3D information on the pore structure of building materials, which can subsequently be used to determine thermal and/or hygric properties of these materials. The characterisations shown below concern a mineral insulation material consisting of fused porous particles (a), characterized by a bimodal pore structure (b). XCT with two different resolutions is hence applied to visualize the inter- and intragranular structures (slices in c and d, renders in e and f). These form the foundations for our pore-scale-based predictions of thermal and hygric properties of building materials.
For the thermal conductivity, the solid and pore fractions in the pore structures are discretized via the finite-element method, to finally allow the calculation of the thermal conduction through the bi-phasic structure. For the hygric properties, a pore network model is extracted from the pore structure image, and the macroscopic moisture storage and transport properties are derived from the hygric phenomena occurring at the pore scale.