Zeitschriftenartikel: „Hemp lime concrete“

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Omeme Ada, A. M., A. D. Tran Le, H. Toifane, P. Tittelein, L. Zalewski, E. Antczak, O. Douzane und T. Langlet. „Hygrothermal performance of hemp lime concrete embedded with phase change materials for buildings“. Journal of Physics: Conference Series 2069, Nr. 1 (01.11.2021): 012005. http://dx.doi.org/10.1088/1742-6596/2069/1/012005.

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Abstract The use of biobased materials in building construction allows the reduction of fossil resource use and energy consumption. Among biobased materials, hemp lime concrete has been investigated in many studies highlighting its capacity to regulate interior relative humidity and its high insulation capacity. In order to design high-performance biobased concretes, a new hemp lime concrete combining the hygric regulation capacity of hemp lime concrete with the thermal regulation performance of phase change material was developed. This article focuses on the thermal and hygric performance of the new hemp lime concretes incorporating micro-capsulated phase change material (PCM) (named HL-PCM). Three hemp lime concretes that differ from formulation were developed and investigated. The thermal properties, moisture buffer values and its impact on interior relative humidity variation have been presented. Thanks to experimental works and numerical simulations, the results obtained showed that the thermal conductivity remain low, the heat capacity and thermal inertia increase considerably for hemp concrete with PCM, while the moisture buffering capacity remains excellent. Finally, numerical results showed that the used of hemp lime concrete (with and without PCM) reduce indoor relative humidity variation and improve indoor hygrothermal comfort.

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Horszczaruk, Elżbieta, Jarosław Strzałkowski, Anna Głowacka, Oliwia Paszkiewicz und Agata Markowska-Szczupak. „Investigation of Durability Properties for Lightweight Structural Concrete with Hemp Shives Instead of Aggregate“. Applied Sciences 13, Nr. 14 (21.07.2023): 8447. http://dx.doi.org/10.3390/app13148447.

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The paper presents the results of testing the performance of lightweight structural concrete containing hemp shives as an aggregate. It has been analysed how the higher binder content and use of the Portland cement affect the thermal and microbiological properties of the lightweight concrete. The aggregates of the plant origin and cement are incompatible because the plant chemical compounds, dissolved in water or an alkaline environment, inhibit cement hydration. To avoid this, mineralisation of the aggregates of plant origin is necessary. The most often used binder in hemp concrete is hydrated lime, a mineraliser. An addition of hydrated lime and sodium trisilicate was used for hemp shiv mineralisation in the tested materials with a cement binder. Concrete containing hemp shiv and cement binder, of which volume share in the concrete was at most 15%, was prepared as a reference concrete. In the remaining three concretes, the total content of the binder in relation to hemp shiv (by mass) was increased 2.5 times. It was shown that lime-binder hemp concrete offers a promising antimicrobial strategy, as it can inhibit bacterial and fungal growth on their surface with superior efficacy. The best results were obtained for tested concretes with the cement–lime binder regarding compressive strength; the average compressive strength was 9.56 MPa.

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Costantine, Georges, Chadi Maalouf, Tala Moussa und Guillaume Polidori. „Monitoring of a Hemp Lime External Building Insulation“. E3S Web of Conferences 111 (2019): 03046. http://dx.doi.org/10.1051/e3sconf/201911103046.

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In a context of promoting energy efficiency, building sector has undergone a notable evolution towards innovative construction insulation materials such as hemp concrete, in order to reduce buildings energy bills and environmental impact. Hemp-Concrete finds application as internal or external thermal insulator in wooden frame walls. In that context, a French building in Grand-Est region, employing Hemp-Concrete as an external insulator is selected and studied. An apartment is monitored for several months. Indoor temperatures, and relative humidities as well as external weather conditions are measured using sensors installed inside the apartment and a weather station placed at the building roof. Indoor comfort analysis shows satisfactory results according to ASHREA standards. Experimental approach is then coupled with a numerical validation at room scale using SPARK simulation tool. Investigations are conducted on indoor office air temperature and relative humidity. Results show a good agreement between numerical values and experimental measurements.

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Kore, Sudarshan D., und J. S. Sudarsan. „Hemp Concrete: A Sustainable Green Material for Conventional Concrete“. Journal of Building Material Science 3, Nr. 2 (14.09.2021): 1. http://dx.doi.org/10.30564/jbms.v3i2.3189.

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Concrete is one of the most important building material and day by day theutilization of concrete is increasing to meet the infrastructure developmentrequirement. On one hand it is unavoidable but some alternative to beexplored to reduce the global environmental impact caused by the concrete.To overcome this from the last decade the world is looking towards thefact of sustainability due to rapid industrialization. The growth in theconstruction industry increased the demand of concrete as constructionmaterial. This concrete produces significant amount of greenhouse emissionin the environment. There is a need to find an alternative solution tominimize the greenhouse emission emitted from the concrete manufacturingplant.Hempcrete is a building material prepared from hemp yarns, lime andwater. This composite material has several beneficial properties like lowin cost, easily available, thermal and acoustic insulation, low density andsustainable cause of no adverse impact of carbon footprint on production.In this study the properties and several benefits of the hempcrete werediscussed in detail.

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Wang, Lepeng, Hélène Lenormand, Hafida Zmamou und Nathalie Leblanc. „Effect of variability of hemp shiv on the setting of lime hemp concrete“. Industrial Crops and Products 171 (November 2021): 113915. http://dx.doi.org/10.1016/j.indcrop.2021.113915.

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de Bruijn, Paulien, und Peter Johansson. „Moisture fixation and thermal properties of lime–hemp concrete“. Construction and Building Materials 47 (Oktober 2013): 1235–42. http://dx.doi.org/10.1016/j.conbuildmat.2013.06.006.

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Faure, P., U. Peter, D. Lesueur und P. Coussot. „Water transfers within Hemp Lime Concrete followed by NMR“. Cement and Concrete Research 42, Nr. 11 (November 2012): 1468–74. http://dx.doi.org/10.1016/j.cemconres.2012.07.007.

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Haik, R., G. Bar-Nes, A. Peled und I. A. Meir. „Alternative unfired binders as lime replacement in hemp concrete“. Construction and Building Materials 241 (April 2020): 117981. http://dx.doi.org/10.1016/j.conbuildmat.2019.117981.

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de Bruijn, Paulien Brigitte, Knut-Håkan Jeppsson, Kenneth Sandin und Christer Nilsson. „Mechanical properties of lime–hemp concrete containing shives and fibres“. Biosystems Engineering 103, Nr. 4 (August 2009): 474–79. http://dx.doi.org/10.1016/j.biosystemseng.2009.02.005.

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Chinh, Ngo Duc, und Nguyen Ngoc Tan. „Design of a new soil concrete as an eco-material: Effect of clay and hemp fibers proportions“. Journal of Science and Technology in Civil Engineering (STCE) - NUCE 14, Nr. 1 (22.01.2020): 77–88. http://dx.doi.org/10.31814/stce.nuce2020-14(1)-07.

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This study presents a series of soil concrete mix that is made of excavated soils, cement, lime and hemp fibers. An experimental program was carried out on the testing samples of soil concrete with different proportions of clayey soil and hemp fibers. This program focus on several properties of soil concrete, such as compressive strength, autogenous shrinkage, drying shrinkage and water mass loss with time. The obtained results show that the compressive strength of soil concrete increases even after 28 days, and can be reduced significantly with increasing the proportion of clayey soil. The effect of clayey soil on the properties tested of soil concrete is more than that of hemp fibers. In addition, drying shrinkage associated with water mass loss allows to describe the drying process of soil concrete. Keywords: soil concrete; hemp fibers; compressive strength; autogenous shrinkage; drying shrinkage; water mass loss.

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Bumanis, Girts, Laura Vitola, Ina Pundiene, Maris Sinka und Diana Bajare. „Gypsum, Geopolymers, and Starch—Alternative Binders for Bio-Based Building Materials: A Review and Life-Cycle Assessment“. Sustainability 12, Nr. 14 (14.07.2020): 5666. http://dx.doi.org/10.3390/su12145666.

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To decrease the environmental impact of the construction industry, energy-efficient insulation materials with low embodied production energy are needed. Lime-hemp concrete is traditionally recognized as such a material; however, the drawbacks of this type of material are associated with low strength gain, high initial moisture content, and limited application. Therefore, this review article discusses alternatives to lime-hemp concrete that would achieve similar thermal properties with an equivalent or lower environmental impact. Binders such as gypsum, geopolymers, and starch are proposed as alternatives, due to their performance and low environmental impact, and available research is summarized and discussed in this paper. The summarized results show that low-density thermal insulation bio-composites with a density of 200–400 kg/m3 and thermal conductivity (λ) of 0.06–0.09 W/(m × K) can be obtained with gypsum and geopolymer binders. However, by using a starch binder it is possible to produce ecological building materials with a density of approximately 100 kg/m3 and thermal conductivity (λ) as low as 0.04 W/(m × K). In addition, a preliminary life cycle assessment was carried out to evaluate the environmental impact of reviewed bio-composites. The results indicate that such bio-composites have a low environmental impact, similar to lime-hemp concrete.

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Zúniga, Arlen, Rute Eires und Raphaele Malheiro. „New Lime-Based Hybrid Composite of Sugarcane Bagasse and Hemp as Aggregates“. Resources 12, Nr. 5 (27.04.2023): 55. http://dx.doi.org/10.3390/resources12050055.

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Bio-based materials help reduce the consumption of non-renewable resources, contributing to the development of sustainable construction. Industrial Hemp Concrete (IHC), which uses hemp stalk (HS) as an aggregate and a lime-based binder, is a bio-based material with various applications. This research developed a new hybrid composite in order to improve the mechanical strength and durability of hemp concrete, with the incorporation of sugarcane bagasse (SCB) as an aggregate, a resource of a renewable origin that is abundant in several countries. Different formulations were used, which were molded and pressed manually, evaluating their cohesion and compactness. The performance of the developed hybrid composite was measured considering mechanical, thermal, and durability properties. The compression test results showed an increase of 19–24% for composites with 75% hemp and 25% SCB. Thermal conductivity and thermal resistance coefficients were also improved, reaching 0.098 (W/m °C) and 0.489 (m2 °C/W), respectively. This aggregate combination also showed the lowest water absorption coefficient (reducing by 35%) and the best performance in durability tests compared to IHC. The resistance to freeze–thaw is highlighted, increasing 400%. The main reason is the influence of the SCB addition because the short and thin fiber form helps to maintain the physical integrity of the composite by filling the spaces between the hemp aggregates.

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Mikulica, Karel, und Rudolf Hela. „Hempcrete - Cement Composite with Natural Fibres“. Advanced Materials Research 1124 (September 2015): 130–34. http://dx.doi.org/10.4028/www.scientific.net/amr.1124.130.

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The paper describes use of hemp boon as a natural organic filler for building materials, especially concrete designed as heat - insulating filler material around the load-bearing structure of wooden buildings. In constructions, hemp has been used in the form of mats made of hemp fiber, with the addition of bonding bicomponent fibers and soda solution for protection against burning and rots. Mats are formed by pneumatic fleece, they are subsequently thermally treated and then cut to the desired dimensions. Calcium-hemp building material is a revolutionary construction and thermal insulating material which can be used for building the entire building, bricks or other insulation are not necessary. The trend is spreading across Europe from France, where the mixture of boon and lime was used in the 16thand 17thcenturies for the construction of timber-framed houses. Although there are hundreds of buildings made from hempcrete in Europe, its use in our country develops very slowly. Concrete is a mixture of hemp boon, lime hydrate, cement and water. It is a recyclable material that offers high thermal and sound insulation. The biggest advantage is undoubtedly the speed of construction, namely hemp concrete hardens very quickly.

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Ruus, A., T. Koosapoeg, M. Pau, T. Kalamees und M. Põldaru. „Influence of production on hemp concrete hygrothermal properties: sorption, water vapour permeability and water absorption“. Journal of Physics: Conference Series 2069, Nr. 1 (01.11.2021): 012004. http://dx.doi.org/10.1088/1742-6596/2069/1/012004.

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Abstract Hemp concrete is considered to be a carbon negative material. Hemp absorbs CO2 during the growth and lime needs CO2 for carbonation. The material, which has good thermal insulation properties, is used as a non-bearing wall material or plaster. For such use the hygrothermal properties of a material must be well known especially when indoor insulation is in focus. In the current study hemp concrete produced in two different ways was in focus and following the hygrothermal properties of hemp concrete as a building material were studied: water absorption (EN 1015-18), water vapour sorption (EN 12571), water vapour permeability (EN 12572) and thermal conductivity (EN 12667). The results of the study can be used in hygrotheramal calculations and modelling.

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Haik, R., A. Peled und I. A. Meir. „The thermal performance of lime hemp concrete (LHC) with alternative binders“. Energy and Buildings 210 (März 2020): 109740. http://dx.doi.org/10.1016/j.enbuild.2019.109740.

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Nguyen, Tai-Thu, Vincent Picandet, Sofiane Amziane und Christophe Baley. „Influence of compactness and hemp hurd characteristics on the mechanical properties of lime and hemp concrete“. Revue européenne de génie civil 13, Nr. 9 (14.11.2009): 1039–50. http://dx.doi.org/10.3166/ejece.13.1039-1050.

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Nguyen, Tai-Thu, Vincent Picandet, Sofiane Amziane und Christophe Baley. „Influence of compactness and hemp hurd characteristics on the mechanical properties of lime and hemp concrete“. European Journal of Environmental and Civil Engineering 13, Nr. 9 (Oktober 2009): 1039–50. http://dx.doi.org/10.1080/19648189.2009.9693171.

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Arizzi, A., M. Brümmer, I. Martín-Sánchez, E. Molina und G. Cultrone. „Optimization of lime and clay-based hemp-concrete wall formulations for a successful lime rendering“. Construction and Building Materials 184 (September 2018): 76–86. http://dx.doi.org/10.1016/j.conbuildmat.2018.06.225.

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Oti, J. E., und J. M. Kinuthia. „The Development of Stabilised Clay-Hemp Building Material for Sustainability and Low Carbon Use“. Journal of Civil Engineering and Construction 9, Nr. 4 (15.11.2020): 205–14. http://dx.doi.org/10.32732/jcec.2020.9.4.205.

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This paper reports on stabilised clay-hemp building material for sustainability and low carbon use. Ground Granulated Blast-furnace Slag (GGBS) was used as a partial substitute for conventional stabiliser (lime or Portland cement) to stabilise Lower Oxford Clay (LOC) incorporating industrial hemp. The development of stabilised clay-hemp building material is expected to underpin the potential of commercial production of non-fired stabilised hemp walls, hemp blocks and hemp bricks, with a potential to offer an environmentally friendly alternative to traditional concrete, fired clay bricks and cement bricks. The parameters considered in this study are: material characterisation, unconfined compressive strength, linear expansion and cost. The 50-day linear expansion results for the test specimens showed that the maximum overall expansion rate for all the stabilised mixtures was 2%. The expansion behaviour of all stabilised clay-hemp material was significantly reduced with the presence of GGBS. The cost analysis results showed that the stabilised clay-hemp material manufactured with lime – GGBS system had the lowest net present value.

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Brzyski, Przemysław. „The Influence of Gum Arabic Admixture on the Mechanical Properties of Lime-Metakaolin Paste Used as Binder in Hemp Concrete“. Materials 14, Nr. 22 (10.11.2021): 6775. http://dx.doi.org/10.3390/ma14226775.

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Organic admixtures based on polysaccharides are used in construction for modifying the properties of mortars and concretes. Gum arabic is an example of a polysaccharide-based biopolymer. The aim of the article was to investigate the possibilities of improving the strength parameters of a binder paste based on hydrated lime and metakaolin. The paste was modified with powdered gum arabic at 1%, 3% and 5% (by mass) as a partial replacement for the binder mix. The influence of the admixture on the pore size distribution as well as flexural and compressive strength was investigated. The admixture enhanced the total porosity of the paste, increasing the pore diameter compared with the reference formulation. The increase in porosity, in turn, did not reduce the mechanical strength. Conversely, the admixture in the amount of 3% and 5% caused a significant increase in the flexural (by about 300% in relation to reference paste) and compressive strengths (by 25% and 60%, respectively). The tested pastes were used as a binder in a composite based on hemp shives. The influence of binder modification on the water absorption and compressive strength of hemp concrete was tested. The strength of the composite soaked in water was also tested. The modification of the binder with gum arabic in the amount of 3% and 5% increased the compressive strength of hemp concrete (not soaked in water) by 53% and 92%, respectively and reduced the mass absorptivity by 6.6% and 10.4%, respectively.

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Adam, L., D. N. Isopescu und D. Lepadatu. „Experimental investigation of parameters influencing mechanical properties of hemp concretes using design of experiment method“. IOP Conference Series: Materials Science and Engineering 1283, Nr. 1 (01.06.2023): 012001. http://dx.doi.org/10.1088/1757-899x/1283/1/012001.

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Abstract Global concerns about climate change have led to the development of building materials that use plant biomass with the added benefit of sequestering carbon from the atmosphere. Lightweight concrete made with hemp, is a material with huge potential in terms of its ability to achieve hygro-thermal performances close to those of polystyrene. This ecological material, referred to in the literature as hemp concrete, is made of some components that, depending on the chosen combination, can generate different results of the physic-mechanical properties. The method is based on a series of experiments that are generated using a program called Design of Experiments (DoE). This program uses statistical analysis of a series of experiments performed by varying one of the input parameters, like the amount of hydrated lime or cement. Following this analysis, it is possible to identify those elements used in the composition, which produced a significant influence on the physical-mechanical properties of hemp concrete. Moreover, this method also allows a quantification of the influences so that the parameters can be ranked, with a minimum number of experiments. The method is, in the same time, a modern and an economical technique used for experimental planning. The aim of the research is to quantify numerically the influence of each component element of the mixture that determines variations of the physical-mechanical properties in hemp concrete. This study will contribute in the future to the optimization of compositions, which will be differentiated on the basis of mechanical performance or thermal insulation criteria.

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Strandberg-de Bruijn, Paulien, und Peter Johansson. „Moisture transport properties of lime–hemp concrete determined over the complete moisture range“. Biosystems Engineering 122 (Juni 2014): 31–41. http://dx.doi.org/10.1016/j.biosystemseng.2014.03.001.

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Tronet, Pierre, Thibaut Lecompte, Vincent Picandet und Christophe Baley. „Study of lime hemp concrete (LHC) – Mix design, casting process and mechanical behaviour“. Cement and Concrete Composites 67 (März 2016): 60–72. http://dx.doi.org/10.1016/j.cemconcomp.2015.12.004.

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Haik, Rotem, Isaac A. Meir und Alva Peled. „Lime Hemp Concrete with Unfired Binders vs. Conventional Building Materials: A Comparative Assessment of Energy Requirements and CO2 Emissions“. Energies 16, Nr. 2 (07.01.2023): 708. http://dx.doi.org/10.3390/en16020708.

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This work assesses the energy requirements and CO2 emissions of a building made of Lime Hemp Concrete (LHC) with alternative unfired binders as lime replacement, compared to buildings made of standard LHC, and several conventional building materials. The assessment is based on ISO 14040, which deals with Life Cycle Assessment (LCA), and examines two aspects: energy, including pre-use phase Embodied Energy (EE), and use phase Operational Energy (OE); and CO2 emissions, including pre-use phase Embodied Carbon (EC), and use phase Operational Carbon (OC). The EE and EC calculations are based on published databases, while OE and OC were obtained with EnergyPlus simulations. The assessment refers to a specific case study in an arid region, with extreme diurnal and seasonal fluctuations of temperature and relative humidity. Using LHC with 100% unfired binder as lime replacement was shown to save up to 90% of the total energy consumption and CO2 emissions, as compared to conventional building materials. The findings of this research clearly demonstrate the high potential of LHC with unfired binders as lime replacement, which possesses the lowest energy requirements and CO2 emissions, illustrating the potential for a building with significantly low environmental impact over its life cycle, i.e., when calculating both EE and EC, and OE and OC.

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Curto, Domenico, Andrea Guercio und Vincenzo Franzitta. „Investigation on a Bio-Composite Material as Acoustic Absorber and Thermal Insulation“. Energies 13, Nr. 14 (17.07.2020): 3699. http://dx.doi.org/10.3390/en13143699.

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In order to limit the anthropic emissions of CO2, research is currently investigating new materials for the building sector. The main purpose is the reduction in the embodied energy consumption, especially in the residential sector, and consequently the limitation of the direct and indirect utilization of fossil fuels, for the indoor heating, cooling, and ventilation services. Indeed, the residential sector is affected by a high energy demand, thus the choice of improved materials is fundamental to improve the sustainability. All phases: construction, building life, and dismantling are impacting in terms of resource and energy consumption, both associated with the emissions of pollutants in the atmosphere. The aim of this experimental research is to study the thermal insulation and the acoustic absorption of a material composed by natural lime, water, and shives from sativa hemp, a variety of hemp usable for industrial applications. In order to assess the main characteristics of this material, some specimens have been made according to required shapes and sizes to test them in specific machines. The results obtained from the tests are compared with the values of similar lime-based materials already available on the market. The comparison shows how, in certain aspects, the lime and hemp shives materials represent a concrete alternative to conventional materials. This completely natural material would like to achieve thermal and acoustic comfort in indoor environments.

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Waghmare, Ankit, Amisha Tembhare, Akshay Gulhane und Mrudul Gotmare. „Use of Hemp in Fly Ash Brick“. International Journal for Research in Applied Science and Engineering Technology 10, Nr. 6 (30.06.2022): 1605–7. http://dx.doi.org/10.22214/ijraset.2022.43817.

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Abstract: The construction sector is one of the primary energy consuming sectors and contributes substantial atmospheric emissions. The building and construction sector is responsible for 30% of global energy use and 17% of greenhouse gas emissions. In the past decade the construction community has been looking at sustainability of construction method. The requirement for improved construction method also leads to the search for new construction materials. One feasible material with suitable technical properties based on renewable is hemp fibre concrete or also known as hempcrete..Hempcrete is a Carbon Negative, non toxic, breathable and biodegradable building material made from hemp fibre, lime, fly ash, sand and water. This bio composite material has excellent thermal and acoustic insulation properties. Using renewable plant based biomaterials such as hemp in building material removes carbon dioxide from the atmosphere, hence reducing the carbon footprint of building infrastructure

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Daher, Suzanne, Amar Benazzouk, Ha飇el Ben Hamed und Thierry Langlet. „Performance Improved of a Lime and Hemp-Based Concrete through the Addition of Metakaolin“. Fluid Dynamics & Materials Processing 19, Nr. 5 (2023): 1091–113. http://dx.doi.org/10.32604/fdmp.2023.020348.

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Nguyen-Sy, T., A. D. Tran-Le, T. Nguyen-Thoi und T. Langlet. „A multi-scale homogenization approach for the effective thermal conductivity of dry lime–hemp concrete“. Journal of Building Performance Simulation 11, Nr. 2 (17.05.2017): 179–89. http://dx.doi.org/10.1080/19401493.2017.1323009.

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Elfordy, S., F. Lucas, F. Tancret, Y. Scudeller und L. Goudet. „Mechanical and thermal properties of lime and hemp concrete (“hempcrete”) manufactured by a projection process“. Construction and Building Materials 22, Nr. 10 (Oktober 2008): 2116–23. http://dx.doi.org/10.1016/j.conbuildmat.2007.07.016.

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Lupu, M. L., D. N. Isopescu, I.-R. Baciu, S. G. Maxineasa, L. Pruna und R. Gheorghiu. „Hempcrete - modern solutions for green buildings“. IOP Conference Series: Materials Science and Engineering 1242, Nr. 1 (01.04.2022): 012021. http://dx.doi.org/10.1088/1757-899x/1242/1/012021.

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Abstract It is widely established that the building industry has a negative impact on the environment and a significant influence on the phenomena that contribute to climate change. Traditional construction materials, such as cement, contribute considerably to environmental pollution. Given the enormous quantity of energy and materials used by the construction sector, this industry must adopt more sustainable practices. Nowadays, an increasing number of natural building materials are used in the structural component or the insulation of buildings. As a result, natural construction materials may be a superior alternative to accomplish this goal. This article discusses the features and applications of hempcrete in the building industry. Hempcrete is a sustainable material composed of industrial hemp, lime as a binder, and water. Due to hemp’s porous structure, it has deformation capacity, sound-absorbing qualities, better hygrothermal properties than conventional concrete, and, depending on the proportions of hemp, lime, and water, fire resistant capabilities due to the presence of lime.

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Bošković, Ilija, und Ana Radivojević. „Life cycle assessment of hemp-lime concrete wall constructions: The impact of wall finish type and renewal regimes“. Journal of Building Engineering 86 (Juni 2024): 108940. http://dx.doi.org/10.1016/j.jobe.2024.108940.

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Bedlivá, Hana, und Nigel Isaacs. „Hempcrete – An Environmentally Friendly Material?“ Advanced Materials Research 1041 (Oktober 2014): 83–86. http://dx.doi.org/10.4028/www.scientific.net/amr.1041.83.

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In the last decade, society has been looking at sustainability of construction. The pressure for improved construction methods also leads to the search for new materials. One possible material with suitable technical properties based on renewable resources is hemp fibre concrete – hempcrete.Hempcrete is a construction material made from hemp fibres, lime and water. This composite breathes, as well as having good thermal and acoustic-insulation properties. The paper provides an overview of international literature and its relevance to New Zealand (where hempcrete has already been used) and the Czech Republic (where the first hempcrete house is under construction).A life cycle analysis of hempcrete will be used to examine its ecological footprint, especially in reducing carbon dioxide emissions. The construction in 2014 of a New Zealand house provides data which can be used to model performance in both countries. The preliminary results suggest that hempcrete offers both environmental and construction opportunities which can help to deliver sustainable housing solutions.

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Pantawee, Saksith, Theerawat Sinsiri, Chai Jaturapitakkul und Prinya Chindaprasirt. „Utilization of hemp concrete using hemp shiv as coarse aggregate with aluminium sulfate [Al2(SO4)3] and hydrated lime [Ca(OH)2] treatment“. Construction and Building Materials 156 (Dezember 2017): 435–42. http://dx.doi.org/10.1016/j.conbuildmat.2017.08.181.

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Chen, Junjie, Chonghui Zhang, Peipei Li und Mingxiao Xu. „The ILHWLAD-MCDM Framework for the Evaluation of Concrete Materials under an Intuitionistic Linguistic Fuzzy Environment“. Journal of Mathematics 2020 (16.11.2020): 1–11. http://dx.doi.org/10.1155/2020/8852842.

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Concrete, one of the sources of energy consumption and carbon emissions, is widely used in the construction industry. The selection of concrete materials raises the question of energy sustainability and turns it into a complex multicriteria decision-making (MCDM) issue. To address this, we present an MCDM framework based on the intuitionistic linguistic hybrid weighted logarithmic averaging distance (ILHWLAD). To begin with, the intuitionistic linguistic numbers are used to deal with the uncertainty and fuzziness of the decision-making process. In addition, in view of the significance and the ordered position of the input arguments, an intuitionistic linguistic hybrid weighted logarithmic averaging distance (ILHWLAD) operator is defined. We, then, initiate the criteria system and present the MCDM framework based on the ILHWLAD to select the finest concrete. A case study involving four alternative materials, namely, autoclaved aerated concrete (AAC), hollow concrete blocks (HCB), expanded polystyrene (EPS), and lime hemp concrete (LHC), is presented to verify the scientificity of the framework.

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Zorica, Jelizaveta, Maris Sinka, Genadijs Sahmenko, Laura Vitola, Aleksandrs Korjakins und Diana Bajare. „Hemp Biocomposite Boards Using Improved Magnesium Oxychloride Cement“. Energies 15, Nr. 19 (05.10.2022): 7320. http://dx.doi.org/10.3390/en15197320.

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The share of bio-based materials in modern construction needs to grow more rapidly due to increasingly stringent environmental requirements as a direct result of the climate emergency. This research aims to expand the use of hemp concrete in construction by replacing traditional lime binder with magnesium oxychloride cement, which provides a faster setting and higher strength, opening the door for industrial production. However, the negative feature of this binder is its low water resistance. In this work, the water resistance of magnesium cement was studied, and the possibilities of improving it by adding fly ash, various acids and nano-silica were considered. Nano-silica and citric acid showed the most significant impact, increasing the binder water resistance up to four times, reaching softening coefficient of 0.80 while reducing the compressive strength of the magnesium cement in a dry state by only 2–10%. On the downside, citric and phosphoric acid significantly extended the setting of the binder, delaying it 2–4 times. Regarding board production, prototype samples of hemp magnesium biocomposite demonstrated compressive strength of more than 3.8 MPa in the dry state but only 1.1–1.6 MPa in the wet state. These results did not correlate with binder tests, as the additives did not increase the strength in the wet state.

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Adam, Laurentiu, und Dorina-Nicolina ISOPESCU. „PHYSICO-MECHANICAL PROPERTIES INVESTIGATION OF HEMPCRETE“. Journal of Applied Life Sciences and Environment 55, Nr. 1(189) (2022): 75–84. http://dx.doi.org/10.46909/alse-551047.

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Food, energy and construction are the three main domains in which different uses of industrial hemp confirm the role and importance that agriculture has in human life. In the current context with an increased need for energy efficiency and environmental protection, the attention of scientists is directed towards the identification of ecological construction materials, and a sustainable way of life, where the circular economy must become part of people’s living habits. The objective of the research was to analyze the thermo-mechanical properties of hempcrete. The goal is to determine a point of reference for future studies that will aim to adapt the agreed compositions to the particularities of the raw material obtained locally. Measurements were determined through laboratory tests, performed on specimens obtained using, for the base material, the woody part of industrial hemp, and for the binder, a mixture consisting of hydrated lime and Portland cement. The results place the construction materials made from hemp vegetable waste in the group of heat-insulating products characterized by low specific weight and thermal transfer coefficients, according with conventional insulating materials, with values between those of polyurethane foam and autoclaved cellular concrete.

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Petersen, S., S. Svendsen und M. Hahn-Hundsdahl. „Experimental and Numerical Investigation of Mould Growth Risk on Wooden Load-Bearing Structure in Hemp-lime Concrete Facades“. Journal of Physics: Conference Series 2654, Nr. 1 (01.12.2023): 012031. http://dx.doi.org/10.1088/1742-6596/2654/1/012031.

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Abstract The need for reducing the environmental impact of the production of building materials has accelerated the emergence of new types of bio-based façade systems. Some of these systems are claimed to have hygro-thermal properties that eliminate the need for a dedicated air and/or vapour barrier as a part of the façade buildup. This paper presents a risk assessment of moisture-related deterioration of the wooden load-bearing structure in an existing hemp-lime concrete building façade system constructed without a dedicated air or vapour barrier in Aarhus, Denmark. Destructive investigation found no mould on structure. The façade was then modelled in WUFI 2D and calibrated using time series data from field measurements of temperature and relative humidity internally in the construction and in its surroundings. The calibrated WUFI model was used to simulate the annual moisture cycle using different initial conditions and weather data. The simulation output was analysed for the risk of mould growth at the wooden load-bearing structure using the Mould Growth Index. Results indicate that the initial moisture content of materials, the position of the wood structure, and the season of construction completion is important to consider to minimise risk of mould growth in the build-up.

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Tran-Le, Anh Dung, Sy-Tuan Nguyen und Thierry Langlet. „A novel anisotropic analytical model for effective thermal conductivity tensor of dry lime-hemp concrete with preferred spatial distributions“. Energy and Buildings 182 (Januar 2019): 75–87. http://dx.doi.org/10.1016/j.enbuild.2018.09.043.

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Moujalled, Bassam, Yacine Aït Ouméziane, Sophie Moissette, Marjorie Bart, Christophe Lanos und Driss Samri. „Experimental and numerical evaluation of the hygrothermal performance of a hemp lime concrete building: A long term case study“. Building and Environment 136 (Mai 2018): 11–27. http://dx.doi.org/10.1016/j.buildenv.2018.03.025.

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Pawluczuk, Edyta, Katarzyna Kalinowska-Wichrowska und Mahfooz Soomro. „Alkali-Activated Mortars with Recycled Fines and Hemp as a Sand“. Materials 14, Nr. 16 (15.08.2021): 4580. http://dx.doi.org/10.3390/ma14164580.

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Nowadays, effective and eco-friendly ways of using waste materials that could replace natural resources (for example, sand) in the production of concrete composites are highly sought. The article presents the results of research on geopolymer composites produced from two types of waste materials—hemp and fine fractions recovered from recycled cement concrete, which were both used as a replacement for standard sand. A total of two research experiments were conducted. In the first experiment, geopolymer mortars were made using the standard sand, which was substituted with recycled fines, from 0% to 30% by weight. In the second study, geopolymers containing organic filler were designed, where the variables were (i) the amount of hemp and the percent of sand by volume (0%, 2.5%, and 5%) and(ii) the amount of hydrated lime and the percent of fly ash (by weight) (0%, 2%, and 4%) that were prepared. In both cases, the basic properties of the prepared composites were determined, including their flexural strength, compressive strength, volume density in a dry and saturated state, and water absorption by weight. Observations of the microstructure of the geopolymers using an electron and optical microscope were also conducted. The test results show that both materials (hemp and recycled fines) and the appropriate selection of the proportions of mortar components and can produce composites with better physical and mechanical properties compared to mortars made of only natural sand. The detailed results show that recycled fines (RF) can be a valuable substitute for natural sand. The presence of 30% recycled fines (by weight) as a replacement for natural sand in the alkali-activated mortar increased its compressive strength by 26% and its flexural strength by 9% compared to control composites (compared to composites made entirely of sand without its alternatives). The good dispersion of both materials in the geopolymer matrix probably contributed to filling of the pores and reducing the water absorption of the composites. The use of hemp as a sand substitute generally caused a decrease in the strength properties of geopolymer mortar, but satisfactory results were achieved with the substitution of 2.5% hemp (by volume) as a replacement for standard sand (40 MPa for compressive strength, and 6.3MPa for flexural strength). Both of these waste materials could be used as a substitute for natural sand and are examples of an eco-friendly and sustainable substitution to save natural, non-renewable resources.

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Sleinus, Daira, Maris Sinka, Aleksandrs Korjakins, Vaira Obuka, Vizma Nikolajeva, Raitis Brencis und Estere Savicka. „Properties of Sound Absorption Composite Materials Developed Using Flax Fiber, Sphagnum Moss, Vermiculite, and Sapropel“. Materials 16, Nr. 3 (25.01.2023): 1060. http://dx.doi.org/10.3390/ma16031060.

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To address the need to reduce consumption and pollution in the industrial sector, composite materials were created using a new type of raw materials—organic lake sediments (sapropel) as a binder; sphagnum moss, flax fiber, and vermiculite as a filler. The main application of these composite materials is for sound absorption and moisture buffering, but since they contain bio-based binders and fillers, they also work as carbon storage. Within the framework of this work, a total of 100 samples of composite materials were created. Fungicides—a biocide quaternary ammonium compound and its natural substitute montmorillonite mineral material were also added to the materials to improve microbiological stability. The mechanical sound absorption and microbiological properties of materials were investigated and compared to similar environmentally friendly materials, such as hemp-lime concrete (FHL), hemp magnesium oxychloride composite (MOC), and hemp magnesium phosphate cement (MPC). The results showed that sound absorption and mechanical and microbial properties of the created composite materials are sufficient for their intended use, with flax fiber and vermiculite composites showing more stable mechanical, sound absorbing, and microbiological stability properties than materials containing flax fiber and moss.

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Adam, Laurentiu, Loredana Judele, Iuliana Motrescu, Ion Rusu, Daniel Lepadatu und Roxana Dana Bucur. „Advanced Design for Experimental Optimisation of Physico-Mechanical Characteristics of Sustainable Local Hemp Concrete“. Sustainability 15, Nr. 11 (23.05.2023): 8484. http://dx.doi.org/10.3390/su15118484.

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The meaning of technological progress is to produce economic development and to increase the level of personal comfort. Sustainability can only be achieved if, at the microsystem level as well as at the macrosystem level, the secondary effects of the activities undertaken by people on the environment are in a state of neutrality compared to the impact they can produce on natural conditions. This neutrality can be intrinsic or can be achieved through coercive and compensatory measures. If we take into account the production of carbon dioxide that accompanies a product from the stages of conceptualisation, design, procurement of materials, execution, operation, maintenance, decommissioning and recycling the waste produced at the end of use, then nothing can be sustainable in pure form. Nevertheless, there are products whose production, both as a raw material and as a technological process, can be neutral in terms of carbon emissions. Moreover, they can even become carbon negative over time. This is also the case with eco-sustainable hemp concrete, whose capacity to absorb carbon dioxide starts from the growth phase of the plant from which the raw material is obtained and continues throughout the existence of the constructed buildings. Not only does it absorb carbon dioxide, but it also stores it for a period of at least 50 years as long as the construction is guaranteed, being at the same time completely recyclable. However, in order to obtain an optimal mixture from the point of view of raw material consumption, represented by industrial hemp wood chips and the binder based on lime and cement, multiple experiments are necessary. The study presented in this work is based on the use of an advanced method of experimental planning (design of experiments method), which makes possible the correlation between the values obtained experimentally and the algorithm that generated the matrix arrangement of the quantities of materials used in the recipes. This approach helps to create the necessary framework for parametric optimisation with a small number of trials. Thus, it is possible to obtain the mathematical law valid within the minimum and maximum limits of the studied domain that defines the characteristics of the material and allows the achievement of optimisation. The material is thus designed to satisfy the maximum thermal insulation requirements that it can achieve depending on a certain minimum admissible compressive strength.

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Asghari, Nima, und Ali M. Memari. „State of the Art Review of Attributes and Mechanical Properties of Hempcrete“. Biomass 4, Nr. 1 (02.02.2024): 65–91. http://dx.doi.org/10.3390/biomass4010004.

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The global surge in environmental pollution, largely attributed to industrialization, has fueled a pressing need for sustainable solutions. In response, the construction sector is increasingly focusing on bio-based materials such as hemp, recognized for its low environmental footprint and prominent carbon-negative quality. As designers, housebuilders, and an environmentally conscious society pivot towards ecological alternatives to standard building materials, hempcrete emerges as a promising candidate. As a composite material mainly made from hemp hurd/shiv, water, and lime, hempcrete offers the ability to sequester carbon long after its incorporation into structures. As a result, the hemp cultivation process—which can be completed within less than four months—ensures that more carbon is absorbed during production and deployment than emitted, e.g., per one study, sequestration on the order of 300 kg of CO2 per m3 of hempcrete. In comparison to concrete, hempcrete offers a more sustainable footprint, given its recyclability post life cycle. This state-of-the-art review paper delves deep into different aspects of hempcrete, summarizing its multifaceted attributes, particularly its compressive strength. Based on the study conducted, the paper also suggests strategies to augment this strength, thereby transitioning hempcrete from a non-load-bearing material to one capable of shouldering significant weight. As architects and designers consistently strive to align their projects with high ecological standards, focusing not just on aesthetic appeal but also environmental compatibility, hempcrete becomes an increasingly fitting solution for the future of construction.

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Bošković, Ilija, und Ana Radivojević. „Life cycle greenhouse gas emissions of hemp-lime concrete wall constructions in Serbia: The impact of carbon sequestration, transport, waste production and end of life biogenic carbon emission“. Journal of Building Engineering 66 (Mai 2023): 105908. http://dx.doi.org/10.1016/j.jobe.2023.105908.

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Zerrouki, Redouane, Amar Benazzouk, Matthieu Courty und Haikel Ben Hamed. „Potential use of matakaolin as a partial replacement of preformulated lime binder to improve durability of hemp concrete under cyclic wetting/drying aging“. Construction and Building Materials 333 (Mai 2022): 127389. http://dx.doi.org/10.1016/j.conbuildmat.2022.127389.

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Pietrak, K., M. Krakowiak und P. Łapka. „Experimental verification of conditions within the cups in the cup method of water vapor permeability measurement“. Journal of Physics: Conference Series 2423, Nr. 1 (01.01.2023): 012009. http://dx.doi.org/10.1088/1742-6596/2423/1/012009.

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Abstract Vapor transmission coefficients of building materials can be determined using the cup method, known from ASTM and ISO standards. The measurement principle is simple, but the method is known to be problematic. In this paper, problems concerning the discrepancy between assumed and real values of relative humidity inside the cups are investigated. This concerns especially dry cups, in which desiccants are expected to produce relative humidity close to 0%. Interestingly, there are studies which suggest a much greater value should be used. To verify these claims, experiments were conducted for cups filled with calcium chloride (CaCl2), and saturated aqueous solution of potassium nitride (KNO3), covered with hemp-lime concrete samples. The study confirms earlier reports of a discrepancy between actual and assumed values of relative humidity inside the cups and shows that they might introduce significant error in the measurement of water vapor transmission coefficients.

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Maalouf, Chadi, Carlo Ingrao, Flavio Scrucca, Tala Moussa, Alexandra Bourdot, Caterina Tricase, Andrea Presciutti und Francesco Asdrubali. „An energy and carbon footprint assessment upon the usage of hemp-lime concrete and recycled-PET façades for office facilities in France and Italy“. Journal of Cleaner Production 170 (Januar 2018): 1640–53. http://dx.doi.org/10.1016/j.jclepro.2016.10.111.

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Moussa, Tala, Chadi Maalouf, Carlo Ingrao, Flavio Scrucca, Georges Costantine und Francesco Asdrubali. „Bio-based and recycled-waste materials in buildings: A study of energy performance of hemp-lime concrete and recycled-polyethylene terephthalate façades for office facilities in France and Italy“. Science and Technology for the Built Environment 24, Nr. 5 (14.03.2018): 492–501. http://dx.doi.org/10.1080/23744731.2018.1438664.

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Babenko, Maryna, Adriana Estokova, Stanislav Unčik und Mykola Savytskyi. „Comparative Study of Lightweight Concretes Based on Hemp and Flax Straw“. Slovak Journal of Civil Engineering 30, Nr. 4 (01.12.2022): 11–16. http://dx.doi.org/10.2478/sjce-2022-0023.

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Abstract The article presents the results of a study involving the properties of flax and hemp-based lightweight concretes as well as the initial characteristics of different straw-based materials. A comparison of straw-based lightweight concretes with and without ordinary Portland cement (OPC) showed that hemp concrete has a 5.6 % higher strength at a 10% deformation, and at the same time, has a 13% greater thermal conductivity coefficient than flax concrete. The physical-chemical study based on a thermal analysis in an air environment has shown that the overall picture of thermal degradation for flax and hemp concretes is similar. Nevertheless, additional peaks of mass loss have been defined for flax concrete. The demonstrated exothermal process is a positive aspect, considering the life cycle of the material and the recycling stage. The paper proposes reference points for the development of new building materials based on straw.

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Walker, R., S. Pavia und R. Mitchell. „Mechanical properties and durability of hemp-lime concretes“. Construction and Building Materials 61 (Juni 2014): 340–48. http://dx.doi.org/10.1016/j.conbuildmat.2014.02.065.

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