Analysis of the Thermal Conductivity of a Bio-Based Composite Made of Hemp Shives and a Magnesium Binder
Energies 2022
Michal Kubis, Piotr Łapka, Łukasz Cieślikiewicz, Genādijs Šahmenko, Māris Šinka, Diāna Bajāre

The evolution of bio-based composites in the building industry is strongly linked with the growing demand for sustainable development, which is relevant nowadays. Hemp shives are a large group of organic residues that are obtained in the process of oil extraction as well as straw processing. These residues could be utilized along with a binder as constituents in the manufacture of bio-based building composites. This study is focused on the impact of density and relative humidity on the effective thermal conductivity of hemp shive-based bio-composites with a magnesium binder. For this reason, a series of samples with variable densities was manufactured and subjected to conditioning in a climatic chamber at a constant temperature and different relative humidity settings. As soon as samples were stabilized, the guarded hot plate method was applied to determine their thermal conductivities. Before each measurement, great care was taken during sample preparation to ensure minimum moisture loss during long-lasting measurements. The results showed that an increase in sample density from 200 kg/m3 to 600 kg/m3 corresponded to up to a three-fold higher composite thermal conductivity. In the case of sample conditioning, a change in relative humidity from a very low value to 90% also resulted in almost 60% average higher thermal conductivity.

Atslēgas vārdi
bio-based composite; guarded hot plate method; hemp shive; insulation bio-based material; material conditioning impact; sustainable building material

Kubis, M., Łapka, P., Cieślikiewicz, Ł., Šahmenko, G., Šinka, M., Bajāre, D. Analysis of the Thermal Conductivity of a Bio-Based Composite Made of Hemp Shives and a Magnesium Binder. Energies, 2022, Vol. 15, No. 15, Article number 5490. ISSN 1996-1073. Available from: doi:10.3390/en15155490

Publikācijas valoda
English (en)
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