Hempcrete – CO<sub>2</sub> Neutral Wall Solutions for 3D Printing

Šinka, Māris; Spurina, Ella; Korjakins, Aleksandrs; Bajāre, Diāna

doi:10.2478/rtuect-2022-0057

Cited by 17 publications

(3 citation statements)

References 21 publications

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“…The application of hemp shives appears potently attractive concerning the use of waste from fiber-using industries like textile one [8]. Moreover, hemp concrete is considered a building material not only for the traditional technology of rising buildings but also for upcoming technologies like 3D printing [9].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of heat transfer in bio-based building block with microencapsulated PCM

Cieślikiewicz

Łapka

Dietrich

et al. 2023

J. Phys.: Conf. Ser.

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The paper presents the investigation of heat transfer in hemp shives and magnesia binder composite with microencapsulated phase change material (PCM) to increase the building material’s thermal mass. The investigated sample was prepared as a three-layer block of dimensions 600×400×480 mm. The external layers of the block had a density of approximately 400-450 kg/m3 and a thickness of 50-60 mm, while the inner layer had a density of approximately 200-250 kg/m3 and a thickness of 290 mm. The study was performed with a block placed between two specially designed climatic chambers. Conditions in chambers were fully stabilized. Additionally, 50 mm wide channels with fans in both chambers were added close to the sample surfaces to force uniform airflow along both sample surfaces. For parameters control in the chambers, dedicated software was developed. Inside the sample nine temperature sensors were placed. During measurements, the temperature of 30°C and relative humidity of 40% was maintained in one chamber, while in the second one, after stabilization in temperature of 20°C and relative humidity of 50%, the temperature was decreased to 15°C without humidity control. During measurement insulating properties of PCM in dynamic conditions were analyzed.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of heat transfer in bio-based building block with microencapsulated PCM

Cieślikiewicz

Łapka

Dietrich

et al. 2023

J. Phys.: Conf. Ser.

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“…More than 36 years have passed since the first officially mentioned use of hemp concrete [1]. Studies on this bio-composite material [2,3] are continuously developing, so there are important works presenting applications [4][5][6][7][8] of this material in the field of construction [9][10][11][12]. It can be used to build insulating walls using self-supporting bricks or as infill in lost formwork and for the plastering layer both in new construction and the renovation of traditional buildings.…”

Section: Introductionmentioning

confidence: 99%

Advanced Design for Experimental Optimisation of Physico-Mechanical Characteristics of Sustainable Local Hemp Concrete

et al. 2023

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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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“…Consequently, there is growing interest in using sustainable resources, emphasizing the importance of sustainable building materials. In the pursuit of sustainability, research into 3D printing with alternative construction materials like earthen materials, hemp hurds, and bio-based materials has garnered significant interest [22][23][24][25][26][27][28][29][30].…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Printability and Rheological and Mechanical Properties of 3D-Printed Earthen Mixes for Carbon-Neutral Buildings

Bhusal,

Sedghi,

Hojati

2023

Sustainability

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This research delves into the vital aspect of adapting local soil properties for 3D printing and explores the mix design of collected earthen materials to tackle challenges in printability, shrinkage, and mechanical properties. Initially, soil samples from six local sites underwent characterization based on Atterberg’s limits, focusing on identifying the most suitable high-clay-content soil. The soil with a higher clay content was used for further study, and its clay type was determined using an X-ray diffraction (XRD) analysis, revealing the presence of 49% kaolinite, 15% nontronite, and 36% illite clay minerals. Four earthen mixes were designed by including stabilizers (i.e., hydrated lime), natural pozzolana, and degradable natural fibers (wheat straw fiber). Subsequently, the study examined their rheological properties, shrinkage behavior, compressive and flexural strength, and printability (including extrudability and buildability). The pure soil mixture excelled in printing quality and mechanical strength, but suffered from cracking and drying shrinkage due to its high nontronite clay content. The existence of 15% nontronite clay mineral in the soil resulted in significant shrinkage and extensive cracking of specimens. However, fiber incorporation effectively mitigated large cracks and reduced shrinkage to as low as 2.6%. Despite initial expectations, introducing lime and pozzolana as soil stabilizers did not improve strength, prevent shrinkage, or improve the printability of soil mixes.

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Hempcrete – CO₂ Neutral Wall Solutions for 3D Printing

Cited by 17 publications

References 21 publications

Experimental investigation of heat transfer in bio-based building block with microencapsulated PCM

Experimental investigation of heat transfer in bio-based building block with microencapsulated PCM

Advanced Design for Experimental Optimisation of Physico-Mechanical Characteristics of Sustainable Local Hemp Concrete

Evaluating the Printability and Rheological and Mechanical Properties of 3D-Printed Earthen Mixes for Carbon-Neutral Buildings

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Hempcrete – CO2 Neutral Wall Solutions for 3D Printing

Cited by 17 publications

References 21 publications

Experimental investigation of heat transfer in bio-based building block with microencapsulated PCM

Experimental investigation of heat transfer in bio-based building block with microencapsulated PCM

Advanced Design for Experimental Optimisation of Physico-Mechanical Characteristics of Sustainable Local Hemp Concrete

Evaluating the Printability and Rheological and Mechanical Properties of 3D-Printed Earthen Mixes for Carbon-Neutral Buildings

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Product

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Hempcrete – CO₂ Neutral Wall Solutions for 3D Printing