Properties of Sound Absorption Composite Materials Developed Using Flax Fiber, Sphagnum Moss, Vermiculite, and Sapropel

Sleinus, Daira; Šinka, Māris; Korjakins, Aleksandrs; Obuka, Vaira; Nikolajeva, Vizma; Brencis, Raitis; Savicka, Estere

doi:10.3390/ma16031060

Cited by 5 publications

(3 citation statements)

References 27 publications

(36 reference statements)

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“…In recent times, with the development of modern industry and air and road traffic, noise has become one of the countless factors affecting human health and the environment worldwide. Noise has become a major problem that causes harmful effects on human health, and combating it requires urgently finding the best solutions through increasingly restrictive regulations and legislation [ 1 , 2 ]. Lately, the improvement of living conditions by regulating noise in the fields of aviation (by reducing the interior noise of passenger aircraft), railways, automobiles and buildings is a requirement forced on industrial companies [ 3 ].…”

Section: Introductionmentioning

confidence: 99%

Sound Absorption Performance and Mechanical Properties of the 3D-Printed Bio-Degradable Panels

Zaharia,

Pop,

Cosnita

et al. 2023

Polymers

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The 3D printing process allows complex structures to be obtained with low environmental impact using biodegradable materials. This work aims to develop and acoustically characterize 3D-printed panels using three types of materials, each manufactured at five infill densities (20%, 40%, 60%, 80% and 100%) with three internal configurations based on circular, triangular, and corrugated profiles. The highest absorption coefficient values (α = 0.93) were obtained from the acoustic tests for the polylactic acid material with ground birch wood particles in the triangular configuration with an infill density of 40%. The triangular profile showed the best acoustic performance for the three types of materials analysed and, from the point of view of the mechanical tests, it was highlighted that the same triangular configuration presented the highest resistance both to compression (40 MPa) and to three-point bending (50 MPa). The 40% and 60% infill density gave the highest absorption coefficient values regardless of the material analyzed. The mechanical tests for compression and three-point bending showed higher strength values for samples manufactured from simple polylactic acid filament compared to samples manufactured from ground wood particles. The standard defects of 3D printing and the failure modes of the interior configurations of the 3D-printed samples could be observed from the microscopic analysis of the panels. Based on the acoustic results and the determined mechanical properties, one application area for these types of 3D-printed panels could be the automotive and aerospace industries.

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Section: Introductionmentioning

confidence: 99%

Sound Absorption Performance and Mechanical Properties of the 3D-Printed Bio-Degradable Panels

Zaharia,

Pop,

Cosnita

et al. 2023

Polymers

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“…Latvian researchers investigated the properties and sound absorption characteristics of composite materials made from sphagnum moss, flax fiber, vermiculite, and SP as a binder [17]. They demonstrated that the compressive strength of such composite materials was 0.1-0.29 MPa, whereas their bending resistance ranged between 0.2 and 0.42 MPa.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Organic Lake Sediments (Sapropel) on the Properties and Biological Resistance of Unfired Clay Bricks

Voišnienė,

Kizinievič,

Albrektienė-Plačakė

et al. 2024

Sustainability

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Clay materials were prepared with clay and sapropel (SP) or clay and modified (frozen) sapropel (FSP) as the main raw materials. Clay-based materials were formed by mixing clay with a different dosage of SP or FSP (5–30 wt.%). The effect of SP or FSP on the properties and biological resistance of clay-based materials was studied. The results show that the bulk density of clay-based materials decreased, and the compressive strength and initial rate of water absorption increased with the increase in the SP or FSP amount in the clay mixture. Research has shown that SP or FSP can be added as a natural additive containing microfibers to improve the mechanical properties of clay materials. When clay bricks had less than 15% sapropel, dry or frozen, we tested the resistance impact of the fungi Rhodotorula mucilaginosa, Stachybotrys chartarum, Cladosporium cladosporioides, and Aureobasidium pullulans under normal conditions.

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“…Although most of these fillers are bound with traditional phenol formaldehyde-based binders, other binders have also been proposed. Starch, sugar, sapropel, lignin, protein, etc., can be used as binders [6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Development of High Strength Particleboards from Hemp Shives and Corn Starch

Rimkienė,

Vėjelis,

Kremensas

et al. 2023

Materials

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In the current study, high-strength boards for the construction industry were developed from renewable natural resources, fibrous hemp shives, and corn starch. During the research, the influence of the composition of the mixture, the processing of raw materials, and technological parameters on the operational properties of the board were evaluated. The influence of the binding material and the water content on the properties of the molded boards was evaluated. It was established that the rational amount of starch is 15% of the mass of the shives, and the amount of water is 10%. It has been established that with the proper selection of the forming parameters of the board, it is possible to avoid internal disintegration of the structure due to the water vapor pressure, increase the bending strength, and ensure uniform sintering of the board throughout the entire volume. It was found that additional processing of hemp shives can increase bending strength by more than 40%. Furthermore, during the processing of shives by chemical means, soluble substances are washed out, which reduces the density and thermal conductivity of the shives. Selection of a rational level of compression allowed us to increase the bending strength of the boards by 40%. The assessment of all factors made it possible to obtain boards with a bending strength of 40 MPa. The additives used made it possible to reduce the water absorption of the boards up to 16 times and obtain non-flammable boards. The thermal conductivity of the resulting boards varied from 0.07 to 0.095 W/(m·K). The analysis of macrostructure and microstructure allowed us to evaluate the process of the formation of bonds between hemp shives.

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Properties of Sound Absorption Composite Materials Developed Using Flax Fiber, Sphagnum Moss, Vermiculite, and Sapropel

Cited by 5 publications

References 27 publications

Sound Absorption Performance and Mechanical Properties of the 3D-Printed Bio-Degradable Panels

Sound Absorption Performance and Mechanical Properties of the 3D-Printed Bio-Degradable Panels

The Effect of Organic Lake Sediments (Sapropel) on the Properties and Biological Resistance of Unfired Clay Bricks

Development of High Strength Particleboards from Hemp Shives and Corn Starch

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