Thermal Properties of New Insulating Juncus Maritimus Fibrous Mortar Composites/Experimental Results and Analytical Laws

Zahia Saghrouni , Dominique Baillis (1) , Naïm Naouar (1) , Nawfal Blal (1) , Abdelmajid Jemni (2)

1 LaMCoS - Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne]
2 LESTE / ENIM - Laboratoire d'Etudes des Systèmes Thermiques et Energétiques [Monastir]

This study aims to study the thermal properties and the microstructure of composite materials based on mortar combined with Juncus maritimus fibers. Effective thermophysical properties of the composite materials containing Juncus maritimus fibers are experimentally and theoretically investigated. To better understand the morphology of these new composites, the corresponding microstructures were characterized in 2D by scanning electron microscope and in 3D using micro computed tomography. The local thermal conductivity of the Juncus maritimus fibers was identified using theoretical models and experimental measurement of the effective thermal conductivity of packed bed of crushed fibers. The thermal conductivity of the mortar matrix at given porosity was also determined using experimental measurement data and a theoretical model. The most appropriate analytical laws to predict effective thermal conductivity of mortar composites containing fibers are deduced from experimental thermal conductivity results.

Mots clés: thermal analytical modeling; thermal insulation; composite material; mortar; Juncus maritimus; thermophysical properties; thermal conductivity; micro computed tomography

Domaines: Mécanique des matériaux [physics.class-ph]; Matériaux

Zahia Saghrouni, Dominique Baillis, Naïm Naouar, Nawfal Blal, Abdelmajid Jemni. Thermal Properties of New Insulating Juncus Maritimus Fibrous Mortar Composites/Experimental Results and Analytical Laws. Applied Sciences, 2019, 9 (5), pp.981. ⟨10.3390/app9050981⟩. ⟨hal-02173002⟩