Physical properties of Australian hurd used as aggregate for hemp concrete

Delhomme, Fabien; Hajimohammadi, Ailar; Almeida, André L. F. de; Jiang, Chaoyang; Moreau, Danielle; Gan, Yixiang; Wang, X.; Castel, Arnaud

doi:10.1016/j.mtcomm.2020.100986

Cited by 29 publications

(27 citation statements)

References 58 publications

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“…It is a composite with mineral binder and plant-based aggregates ground to 5–40 mm long from hemp's shiv or woody core [ 174 ]. The properties of the composite depend on binder type, aggregate to binder ratio, size and porosity of the aggregates, and level of compaction [ 175 ]. Notable uses of hempcrete started in early 1980 [ 176 ], but as shown in Figures 4 , 5 , 6 , 7 , 8 , 9 , hempcrete has proven acceptable as non-load bearing in walls, floors, and roof insulation [ 177 ] due to its lightweight, good moisture buffering, thermal insulation, and acoustic properties [ 175 , 178 ].…”

Section: Hempcretementioning

confidence: 99%

“…The mechanical performance of hempcrete is relatively modest [ 176 ] with very ductile elastic-plastic behavior in compression and tension having a dry density ranging from 200 to 800 kg m −3 . Most researchers report that this lightweight porous material shows a compressive strength of less than 1 MPa [ 183 ] though few pieces of literature claim it to range up to 3.6 MPa after 28 days with a variable Young's modulus [ 175 ]. Therefore, its favorable use is as non-loadbearing walls with supporting frames [ 174 , 179 , 187 ] or as finishing plasters with indoor and outdoor insulation properties when density is low, whereas it can also be used as floor or roof insulators with increased density [ 177 ].…”

Section: Hempcretementioning

confidence: 99%

“…The causes behind the low mechanical performance of hempcrete have been studied extensively, and the factors identified for inadequate mechanical performance are its high porosity of about 80% in volume, the particle size of the aggregate, voids, too much hydrophilic nature of the aggregate, binder content and setting or curing process [ 176 , 183 , 188 ]. In addition, the level of compaction, flexibility, imperfect particle arrangement [ 174 , 175 , 181 ], and recurring wetting-drying cycles [ 183 ] also considerably affect the mechanical strength of hempcrete.…”

Section: Hempcretementioning

confidence: 99%

“…Being highly porous and hydrophilic, hemp shiv can absorb up to 270% water after a few minutes [ 172 ] and 400% water of its weight after 48-hour immersion [ 181 ]. Hempcrete is quite more permeable than other construction materials and can work as moisture buffering materials [ 175 , 187 ] due to its fast moisture transport and retention ability and high permeability [ 194 ]. This buffering feature offers better control of extreme humidity, decreases vapor condensation, limits micro-organism development and thereby ensures indoor comfort [ 177 , 187 ].…”

Section: Hempcretementioning

confidence: 99%

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Hemp as a potential raw material toward a sustainable world: A review

Ahmed

Islam

Mahmud

et al. 2022

Heliyon

115

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Global warming as a result of climate change has become a major concern for people all over the world. It has recently drawn the attention of the entire conscious community, with the fear that if not addressed properly, it will result in the extinction of numerous species around the world. At the same time, it will pose a threat to human health, food security, living environment and standard of living. Thereby, possible solutions are being explored accordingly; regulations have been imposed in places binding green production practices, limiting the emission of CO 2 and emphasis is given on renewable resources along with the search for alternatives to carbon-positive materials. Cannabis sativa L. (hemp) has received a lot of attention because of its multipurpose usability, short production cycle, low capital demand in cultivation, possibility of carbon-negative transformation and easy carbon sequestering material. This paper reviews hemp as a very promising renewable resource including its potential uses in paper, textiles, composites, biofuel, and food industry.

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Section: Hempcretementioning

confidence: 99%

Section: Hempcretementioning

confidence: 99%

Section: Hempcretementioning

confidence: 99%

Section: Hempcretementioning

confidence: 99%

See 2 more Smart Citations

Hemp as a potential raw material toward a sustainable world: A review

Ahmed

Islam

Mahmud

et al. 2022

Heliyon

115

View full text Add to dashboard Cite

show abstract

“…The properties of the shives are also influenced by the details of the processing of hemp stems, namely whether the retting process was used or not [16]. The main effect of the retting process is a decrease of the bulk density which is the result of hemp degradation, enhancing its thermal and acoustic performance.…”

Section: Introductionmentioning

confidence: 99%

Influence of Hemp Shives Size on Hygro-Thermal and Mechanical Properties of a Hemp-Lime Composite

et al. 2020

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Different fractions of hemp shives are used in the mixtures of the hemp–lime composite. The market offers shives of different granulation. It depends on the type of industrial hemp and on the capabilities of decortication machines. The aim of the research presented in the article is to check differences in the mechanical and hygro-thermal properties of composites with different shives fractions. The research part of the paper presents the preparation method and investigation on hemp–lime composites. Apparent density, total porosity, thermal conductivity, capillary uptake, vapor permeability, specific heat, mass absorptivity, flexural and compressive strength were examined. The results confirm that the shives fraction influences the individual properties of the composites. Hemp–lime composites with fine shives are characterized by higher water absorption, thermal conductivity, mechanical strength, vapor permeability as well as lower capillary-lifting capacity and specific heat than composites with thick shives.

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Influence of particle granulometry and panel composition on the physico‐mechanical properties of ultra‐low‐density hemp hurd particleboard

et al. 2023

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This study investigated Australian hemp hurd (Cannabis sativa L., “Frog One”) as a lignocellulosic raw material for ultra‐low‐density hemp particleboard (ULHPB) with densities ranging from 213 to 309 kg/m3. The hurd was first milled and fractionated into three particle size categories, that is, fine (F), medium (M), and coarse (C). Twelve unique ULHPB variants were then fabricated comprising varying particle loadings from four particle size mixes, that is, 100% C, 100% M, 50%/50% CM, 25%/50%/25% CMF, and adhesive contents of bio‐epoxy (EPX), phenol resorcinol formaldehyde (PRF), and emulsifiable methylene diphenyl diisocyanate (MDI), respectively. The panel assessments, conducted in accordance with the Australian reconstituted wood‐based panels standard AS/NZS 1859.1 (2017), revealed a significant effect of particle dimension on most physico‐mechanical properties. Furthermore, the resination method and pressing temperature controlled post‐cure panel expansion and additional panel characteristics. Notably, MDI‐ULHPB exhibited drastically different behavior and properties compared to EPX and PRF equivalents, demonstrating greater bending strength, stiffness, screw withdrawal strength, and dimensional stability. Importantly, all MDI variants conformed to the 15% thickness swelling limit for moisture resistant particleboard. Surface lamination of MDI‐bonded ULHPB with sheets of aluminum, Masonite, and Kraft liner significantly improved the inherently low flexural properties, suggesting the potential suitability of ULHPB as a core layer in lightweight sandwich composite panels. The integration of agricultural by‐products, such as hemp hurd, into engineered building materials presents a promising opportunity to mitigate the depletion of finite timber resources and aligns well with circular economy principles.Highlights Utilizing agricultural residue as sustainable raw material in building products. Hemp hurd enables ultra‐low‐density particleboard with thermosetting resins. Coarse particle size mix enhances mechanical performance in panels. Panel characteristics controlled by resination method and pressing temperature. Lamination enhances functionality of lightweight hemp hurd sandwich panel.

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Physical properties of Australian hurd used as aggregate for hemp concrete

Cited by 29 publications

References 58 publications

Hemp as a potential raw material toward a sustainable world: A review

Hemp as a potential raw material toward a sustainable world: A review

Influence of Hemp Shives Size on Hygro-Thermal and Mechanical Properties of a Hemp-Lime Composite

Influence of particle granulometry and panel composition on the physico‐mechanical properties of ultra‐low‐density hemp hurd particleboard

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