Abstract
The aim of the research presented in the article was to check the differences in the hygro-thermal and mechanical properties of hemp-lime composites with different shives fractions, depending on the direction of mixture compaction. The research part of the paper presents the preparation method and investigation on the composites. Thermal conductivity, capillary uptake, as well as flexural and compressive strengths were examined. Additionally, an analysis of the temperature distribution in the external wall insulated with the tested composites was performed. The results confirm that the direction of compaction influences the individual properties of the composites in a similar way, depending on the size of the shives. The differences are more pronounced in the case of the composite containing longer fractions of shives. Both thermal conductivity of the material and the capillary uptake ability are lower in the parallel direction of the compaction process. Composites exhibit greater stiffness, but they fail faster with increasing loads when loaded in the direction perpendicular to compaction.
Highlights
The difference in the basic properties of these composites was demonstrated in another own work [16], while this paper presents the influence of the direction of the mixture compaction on selected parameters of composites, such as thermal conductivity, capillary rise, as well as flexural and compressive strengths
The article presents the studies of the anisotropic properties of the hemp-lime composite prepared according to two recipes, differing in the fraction of hemp shives
The direction of heat flow in relation to the direction of compaction of the hemplime mixture in the formwork affects the thermal conductivity of the composite
Summary
Anisotropic materials have different properties, depending on the direction in which they are tested. This phenomenon is a feature of the materials that exist in a monocrystalline form, but polycrystalline bodies may have anisotropic properties due to texture or the influence that the decomposition of impurities in their structure may have [1]. The influence of anisotropy may be important both in the mechanical tests of the material and in the tests of physical and thermal properties. In the case of wood, the differences in the mechanical properties depending on the direction of load application lie in the complex structure of the material [7]
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