Analysis of the Thermal Conductivity of a Bio-Based Composite Made of Hemp Shives and a Magnesium Binder

Michał Kubiś, Piotr Łapka, Łukasz Cieślikiewicz, Genadijs Sahmenko, Maris Sinka and Diana Bajare
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Michał Kubiś: Faculty of Power and Aeronautical Engineering, Institute of Heat Engineering, Warsaw University of Technology, Nowowiejska St. 21/25, 00-665 Warsaw, Poland
Piotr Łapka: Faculty of Power and Aeronautical Engineering, Institute of Heat Engineering, Warsaw University of Technology, Nowowiejska St. 21/25, 00-665 Warsaw, Poland
Łukasz Cieślikiewicz: Faculty of Power and Aeronautical Engineering, Institute of Heat Engineering, Warsaw University of Technology, Nowowiejska St. 21/25, 00-665 Warsaw, Poland
Genadijs Sahmenko: Faculty of Civil Engineering, Institute of Materials and Structures, Riga Technical University, Kalku St. 1, LV-1658 Riga, Latvia
Maris Sinka: Faculty of Civil Engineering, Institute of Materials and Structures, Riga Technical University, Kalku St. 1, LV-1658 Riga, Latvia
Diana Bajare: Faculty of Civil Engineering, Institute of Materials and Structures, Riga Technical University, Kalku St. 1, LV-1658 Riga, Latvia

Energies, 2022, vol. 15, issue 15, 1-11

Abstract: 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/m 3 to 600 kg/m 3 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.

Keywords: bio-based composite; hemp shive; sustainable building material; insulation bio-based material; material conditioning impact; guarded hot plate method (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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