Mechanical and physical properties of industrial hemp-based insulation materials

Kallakas, Heikko; Närep, M; Närep, A; Poltimäe, Triinu; Kers, Jaan

doi:10.3176/proc.2018.2.10

Cited by 13 publications

(11 citation statements)

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“…According to the results, the MOR values of the insulation boards of 13 mm of thickness meet requirements of ASTM C208-12 standard [28] for roof insulation board of grade 1 (0.97 MPa), although MOR values were lower for the categories of wall sheathing regular and structural (1.90 and 2.76 MPa) and roof insulation board of grade 2 (1.90 MPa). The MOR values of the insulation boards were also close to other insulation boards [4,7,10], which presented similar or higher density values. The effect of parameters on the tensile strength parallel to surface was also evaluated.…”

Section: Physical and Mechanical Propertiessupporting

confidence: 71%

“…Recently, the use of natural, sustainable, renewable, and environmentally friendly materials has gained interest because of increasing environmental awareness. The research in the field of insulation materials in the building industry has been focusing increasingly more on the use of natural, local materials that are nontoxic, are recyclable, and can assure good thermal insulation [1,6,7]. Insulation products incorporating natural fibers are available on the market.…”

Section: Introductionmentioning

confidence: 99%

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Thermo-Mechanical Properties of a Wood Fiber Insulation Board Using a Bio-Based Adhesive as a Binder

et al. 2020

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The goal of the present study was to develop a low-density thermal insulation board using wood fibers and a bio-based adhesive as a binder, which was prepared from a crude glycerol and citric acid mixture. The physical and mechanical properties of insulation boards manufactured using two ratios of crude glycerol and citric acid (1:0.66 and 1:1 mol/mol) and two adhesive contents (14% and 20%) were evaluated. The results show that the insulation boards with a range of density between 332 to 338 kg m−3 present thermal conductivity values between 0.064 W/m-K and 0.066 W/m-K. The effect of adhesive content was very significant for certain mechanical properties (tensile strength perpendicular to surface and compressive strength). The tensile strength (internal bond) increased between 20% and 36% with the increased adhesive content. In contrast, the compressive strength decreased between 7% and 15%. The thermo-mechanical properties obtained of insulation boards such as thermal conductivity, traverse strength, tensile strength parallel and perpendicular to surface, and compressive strength are in accordance with the requirements of the American Society for Testing and Materials C208-12 standard for different uses. The results confirm the potential of crude glycerol and citric acid mixture to be used as an adhesive in the wood fiber insulation boards’ manufacturing for sustainability purposes.

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Section: Physical and Mechanical Propertiessupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Thermo-Mechanical Properties of a Wood Fiber Insulation Board Using a Bio-Based Adhesive as a Binder

et al. 2020

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“…The higher tensile strength observed on hemp panels can be attributed to its higher fiber length (46.6 ± 8.2 mm) compared to Posidonia (19.4 ± 13.5 mm) and alfa (41.7 ± 16.4 mm), which permits better fiber-to-fiber bonding with PE/PET bicomponent fibers. Kallakas et al . found a value of 0.015 MPa for hemp fiberboards with a density of 544 kg/m 3 .…”

Section: Resultsmentioning

confidence: 99%

Influence of Anatomy, Microstructure, and Composition of Natural Fibers on the Performance of Thermal Insulation Panels

Ayadi,

Segovia,

Baffoun

et al. 2023

ACS Omega

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The growing interest in environmentally friendly materials is leading to a re-evaluation of natural fibers for industrial applications in order to meet sustainability and low-cost objectives, especially for thermal insulation of buildings. This paper deals with the chemical and physical characterization of fibers extracted from seagrass ( Posidonia oceanica ) and alfa grass ( Stipa tenacissima ) for a possible substitution of synthetic materials for thermal insulation. Hemp ( Cannabis sativa ), a fiber broadly used, was also studied for comparison. The parameters characterized include porosity, thermal degradation, elemental composition, skeletal and particle density of the fibers as well as investigation of the thermal conductivity of fiber-based panels. Several technologies were involved in investigating these parameters, including mercury intrusion, thermogravimetric analysis, fluorescence spectroscopy, and fluid pycnometry. The fibers showed a degradation temperature between 316 and 340 °C for Posidonia , between 292 and 326 °C for alfa, and between 300 and 336 °C for hemp fibers. A high porosity allied with a reduced pore size was revealed for Posidonia (77%, 0.54 μm) compared to hemp (75%, 0.61 μm) and alfa (57%, 2.1 μm) raw fibers, leading to lower thermal conductivity values for the nonwoven panels based on Posidonia (0.0356–0.0392 W/m.K) compared to alfa (0.0365–0.0397 W/m.K) and hemp (0.0387–0.0427 W/m.K). Bulk density, operating temperature, and humidity conditions have been shown to be determining factors for the thermal performance of the panels.

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“…Nowadays, hemp is one of the most promising and widely used thermal insulation materials, known for its durability and environmental friendliness. Hemp is obtained from local natural fibers and can be used in the innovative production of materials [1,2].…”

Section: Introductionmentioning

confidence: 99%

“…The rapid development of sustainable and carbon-neutral buildings makes hemp fibers a potentially effective building material which is widely studied [2,7]. One of the trends is hemp concrete, an example of vegetal concrete, which provides reduced carbon emissions and has a low environmental impact.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Thermal Parameters of Hemp Fiber Insulation

et al. 2020

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Nowadays, sustainable construction is a key factor for reaching net-zero emissions of carbon dioxide all over the world. This goal is impossible to achieve by merely reducing the energy consumption of end-users. A more holistic approach should be taken, adopting sustainable industrial practices that use environmentally friendly materials on a large scale. This paper presents the analysis of the hydrothermal properties of hemp thermal insulation plates. We carried out extensive measurements and the analysis of the thermal conductivity coefficient, drying-out dynamics, and water absorption. The study was performed with experimental insulation samples based on the fiber obtained from hemp stems, prepared using different adhesive powders. The dimensions of the analyzed samples were 300 × 300 mm. The proposed samples are not yet available in mass production. Hemp does not flower in the Baltic region and was traditionally used for soil regeneration. Thus, using this raw material increases the added value of agricultural residues. Three series of hemp fiber samples with different substances and pressing modes were evaluated in the study. Each set of samples consisted of four plates with varying thicknesses and two different densities: 200 kg/m3 and 300 kg/m3. All samples exhibited a significant increase in moisture absorption and a strong correlation with the increase in thermal conductivity. The average thermal conductivity of the test samples ranged from 0.0544 to 0.0594 W/mK. The impact of the adhesive powder on the thermal conductivity was found to be extremely small. However, the values obtained were much higher than those for traditional thermal insulation materials, allowing to utilize the local agriculture residues and providing material for the construction of eco-friendly buildings.

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Mechanical and physical properties of industrial hemp-based insulation materials

Cited by 13 publications

References 0 publications

Thermo-Mechanical Properties of a Wood Fiber Insulation Board Using a Bio-Based Adhesive as a Binder

Thermo-Mechanical Properties of a Wood Fiber Insulation Board Using a Bio-Based Adhesive as a Binder

Influence of Anatomy, Microstructure, and Composition of Natural Fibers on the Performance of Thermal Insulation Panels

Analysis of Thermal Parameters of Hemp Fiber Insulation

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