Hemp-Clay Concretes for Environmental Building—Features that Attribute to Drying, Stabilization with Lime, Water Uptake and Mechanical Strength

Brümmer, Monika; Sáez-Pérez, Ma Paz; Suárez, Jorge Alberto Durán

doi:10.1007/978-3-319-64641-1_21

Cited by 6 publications

(8 citation statements)

References 20 publications

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“…Comparing the concentrations of metals in water extracts (with concentration values higher than the threshold of the method applicability), it was found that the concentrations in the geopolymer water extract are lower: from two (Cu) to almost fourteen times (Pb). Low leachability of Pb from geopolymers was also confirmed in other studies (e.g., [ 24 ]). The above results indicate a partial immobilization of metals in CRT glass in geopolymers and the reduction of their transmission to the environment as a result (similar conclusions are presented, e.g., in [ 27 ]).…”

Section: Resultssupporting

confidence: 85%

“…The topic of eco-friendly materials is recently garnering the interest of scientists all over the world. Among the most important benefits of eco-friendly materials, scientists list the use of natural materials, a reduction in greenhouse emissions, a reduction in energy needed during manufacturing of materials and during use in construction, the possibility of the reuse of industrial wastes, and the limitation of transport by using locally available materials [ 24 , 25 , 26 , 27 ]. Geopolymers satisfy several out of the mentioned criteria allowing for savings in greenhouse gas emissions [ 28 ], for the reuse of different type of wastes such as mining wastes [ 29 ] and industrial and agricultural wastes [ 30 ], as well as for the utilization of hazardous wastes such as red mud [ 31 ].…”

Section: Introductionmentioning

confidence: 99%

“…Hemp-fibered concretes combine the properties of being light-weight, fire-resistant, and user-friendly with quite good performance. Additionally, local materials such as raw clay may be used in the process [ 24 ]. The next eco-friendly proposition for an insulating material of low thermal conductivity is a composite of gypsum reinforced with cork fiber and cardboard waste [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

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Characteristics of Metakaolin-Based Geopolymer with Cathode Ray Tube Glass

et al. 2021

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Geopolymers can be treated as an environmentally friendly alternative for concrete and enables utilization of various wastes. This paper focuses on the possibility of application of discarded cathode ray tube (CRT) glass inside a metakaolin-based geopolymer in the form of an aggregate, providing an ecological method of recycling of this hazardous material. The main goal of this paper was to develop an optimal composition of a new geopolymer and to describe its behavior under varying curing conditions. A geopolymer made of different mixtures was subjected to flexural and compressive strength tests. The density, mass loss, temperature changes, and metals leaching were determined as well. The results demonstrated that neither the content of CRT glass nor the curing regime has a significant influence on the mechanical behavior. However, the strength of the geopolymer containing 50% CRT glass by mass increased with time in contrast to a geopolymer with a higher CRT glass content. The development of temperature inside the mixture was dependent on the amount of metakaolin. The concentration of toxic metals in an aqueous extract decreased considerably after the encapsulation of CRT glass inside the geopolymer. The presented results indicate that discarded CRT glass can be considered an aggregate for a metakaolin-based geopolymer. The new material shows high strength and makes the CRT glass safe for the environment.

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Section: Resultssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Characteristics of Metakaolin-Based Geopolymer with Cathode Ray Tube Glass

et al. 2021

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“…Interestingly, smaller hemp shiv particles enhance mechanical strength without affecting thermal conductivity. Yet, in contrast, smaller particles in hemp plaster reduce thermal conductivity, necessitating further study [64,77,78,[114][115][116][117][118][119][120][121][122]. The performance of hemp-plaster coatings is more influenced by anisotropic aggregates' orientation than particle size.…”

Section: Thermal Propertiesmentioning

confidence: 99%

State of the Art Review of Attributes and Mechanical Properties of Hempcrete

Asghari,

Memari

2024

Biomass

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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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“…In addition, incorporating plant aggregates can improve the thermal performance of an earth material [30][31][32] and limit its drying shrinkage [33]. A growing number of research projects are exploiting this potential by combining the use of plant-based aggregates and raw earth [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Bibliometric Analysis of Bio- and Earth-Based Building Materials: Current and Future Trends

Rosa Latapie,

Abou-Chakra,

Sabathier

2023

Construction Materials

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The energy and environmental transition in the building sector requires the development and use of low-impact materials. Despite the growing interest in bio-based and earth-based building materials, their widespread adoption is still limited due to a lack of hindsight, as their study is relatively recent. This study aims to contribute to the development of these materials by providing an extensive overview of key contributors (authors, countries, journals) in these fields. Then, the keywords of the corresponding publications were analyzed to reveal the main topics covered to date. First, a broad scale is presented, followed by a focus on sub-categories, specifically raw materials for bio-based building materials and implementation techniques for earth-based ones. Finally, a comparative analysis, with the themes covered by composite construction materials as a whole, completes the study. Using statistical analysis coupled with bibliometric network visualization software, this study provides clear, quantifiable, and objective insights into current trends. Furthermore, it facilitates the identification of new, promising research perspectives and highlights the importance of interdisciplinary collaboration. Physics, modeling, durability and microstructure studies emerge as relevant levers for advancing the future development of these eco-friendly building materials.

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Hemp-Clay Concretes for Environmental Building—Features that Attribute to Drying, Stabilization with Lime, Water Uptake and Mechanical Strength

Cited by 6 publications

References 20 publications

Characteristics of Metakaolin-Based Geopolymer with Cathode Ray Tube Glass

Characteristics of Metakaolin-Based Geopolymer with Cathode Ray Tube Glass

State of the Art Review of Attributes and Mechanical Properties of Hempcrete

Bibliometric Analysis of Bio- and Earth-Based Building Materials: Current and Future Trends

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