Authors:Lucia Kidalova, Eva Terpakova, and Nadezda Stevulova
Development of lightweight composite materials based on organic binder is oriented on conventional inorganic binders replacement by alternative materials such as MgO cement. The objective of this paper is lightweight composites preparing with hemp shives and conventional binders (hydrated lime, cement) replacement by MgO cement. The achieved experimental results of compressive strength and thermal conductivity of hardened composites indicate that the use MgO cement based on the milled caustic magnesite is suitable conventional binders replacement in hemp concrete.
Authors:Lucia Kidalova, Nadezda Stevulova, and Eva Terpakova
All composites based on natural fibers absorb moisture in humid atmosphere and when immersed in water or capillary action. Therefore, one of the major drawbacks of polymer fibers is their high availability to moisture sorption and their heterogeneity, which leads to a weak interface between the fibers and matrix and a poor transfer of the applied stress between the materials, resulting to reduction of physico-mechanical properties. An experimental investigation was conducted to testing the water absorption of hemp composites with MgO-cement binder and its influence on the physico-mechanical and thermal characteristics of composites. The achieved results of composites indicate that water absorption test has deteriorative influence on observed properties due to the degradation of the fibre-matrix interface.
Authors:Ivana Schwarzova, Nadezda Stevulova, Eva Singovszka, Eva Terpakova, and Jozef Junak
This article concerning natural cellulose fibers as reinforcement in composite materials in civil engineering. In this paper, the attention is given to industrial hemp specifically to the woody part of hemp plant called hemp hurds. The properties of natural fibers are mainly determined by the chemical and physical composition, such as structure of fibers.
The objective of presented research is to characterize raw and physically treated hemp fibers using Fourier transform infrared spectroscopy method. These natural fibers were used as filler into biocomposites and MgO-cement was used as alternative binder. Physico — mechanical properties (compressive strength, thermal conductivity, absorbability) of prepared composites were determined.