Hygrothermal and mechanical characterisation of novel hemp shiv based thermal insulation composites

Hussain, Atif; Calabria-Holley, Juliana; Lawrence, Michael B.; Jiang, Yunhong

doi:10.1016/j.conbuildmat.2019.04.029

Cited by 60 publications

(32 citation statements)

References 31 publications

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“…However, based on the qualification that a material is qualified as insulating material when its thermal conductivity is less than 0.1 W.m −1 K −1 [19], the slight increase in the thermal conductivity values of the natural fiber reinforced PU foams induced by the addition of the fibers will not affect their application as thermal insulators since their thermal conductivity values were still much smaller than 0.1 W.m −1 K −1 . For comparison, the natural fiber reinforced PU foams in this research has lower or comparable thermal conductivity values with the bio-based thermal insulations as reported in previous researches [12][13][14][15]20].…”

Section: Resultssupporting

confidence: 67%

“…Recent studies have reported the application of biomass on the preparation of thermal insulations. Atif et al (2019) developed water resistant hemp shiv based thermal lightweight insulations, and the composites showed low thermal conductivity values of 0.051−0.058 W.m −1 K −1 and relatively good compressive stress from 0.49 to 1.05 MPa [12]. Marie et al (2019) investigated the hemp shiv and corn cob residues as bio-based thermal insulation materials, and the obtained composites had thermal conductivity ranging between 0.0675 to 0.1479 W.m −1 K −1 [13].…”

Section: Introductionmentioning

confidence: 99%

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Renewable natural resources reinforced polyurethane foam for use of lightweight thermal insulation

Shao

Zhang

Han

et al. 2020

Mater. Res. Express

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To obtain the energy-saving and environment-friendly lightweight bio-based thermal insulation, polyurethane matrix was incorporated with wood fiber, bamboo fiber, rice husk and liquefied polyol at different percentages (25%, 30%, and 35%). The results revealed that the apparent density for the natural fibers reinforced thermal polyurethane insulation was between 105 kg.m −3 and 178 kg.m −3 by adding 35% of the fibers into the polyurethane matrix. The thermal conductivity of the bio-based thermal insulation ranged from 0.045 to 0.065 W.m −1 K −1 , the addition of the natural fibers increased mechanical strength. The prepared bio-based insulation showed great potential for building thermal insulations with particularly low thermal conductivity (less than 0.065 W.m −1 K −1 ) and self-bearing strength.

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Section: Resultssupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Renewable natural resources reinforced polyurethane foam for use of lightweight thermal insulation

Shao

Zhang

Han

et al. 2020

Mater. Res. Express

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“…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%

“…At the same time, the highly developed porous cellular structure makes the material vulnerable to moisture conditions. Nowadays, thermal insulation composites with hemp are widely studied [7,13,14].…”

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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“…Under constant stress loading at intermediate temperatures, multiple damage mechanisms of matrix cracking, fiber/matrix interface debonding, and interphase and fiber oxidation occurs in CMCs [9,10,11]. Hussain et al [12] and Khosravani et al [13] performed investigations on the thermal issues on composites. Morscher et al [14] investigated the stress-rupture of a woven SiC/SiC composite with the BN interphase.…”

Section: Introductionmentioning

confidence: 99%

Stress-Rupture of Fiber-Reinforced Ceramic-Matrix Composites with Stochastic Loading at Intermediate Temperatures. Part I: Theoretical Analysis

2019

Materials

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Under stress-rupture loading, stochastic loading affects the internal damage evolution and lifetime of fiber-reinforced ceramic-matrix composites (CMCs) at intermediate temperatures. The damage mechanisms of the matrix cracking, fiber/matrix interface debonding and oxidation, and fiber fracture are considered in the analysis of stochastic loading. The strain, fiber/matrix interface debonding and oxidation length, and the broken fibers fraction versus the time curves of SiC/SiC composite under constant and three different stochastic loading conditions are analyzed. The effects of the stochastic loading stress level, stochastic loading time, and time spacing on the damage evolution and lifetime of SiC/SiC composite are discussed. When the stochastic loading stress level increases, the stress-rupture lifetime decreases, and the time for the interface complete debonding and oxidation decreases. When the stochastic loading time and time spacing increase, the stress-rupture lifetime decreases, and the time for the interface complete debonding and oxidation remains the same.

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Hygrothermal and mechanical characterisation of novel hemp shiv based thermal insulation composites

Cited by 60 publications

References 31 publications

Renewable natural resources reinforced polyurethane foam for use of lightweight thermal insulation

Renewable natural resources reinforced polyurethane foam for use of lightweight thermal insulation

Analysis of Thermal Parameters of Hemp Fiber Insulation

Stress-Rupture of Fiber-Reinforced Ceramic-Matrix Composites with Stochastic Loading at Intermediate Temperatures. Part I: Theoretical Analysis

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