A review of the factors affecting the properties and performance of hemp aggregate concretes

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

doi:10.1016/j.jobe.2020.101323

Cited by 53 publications

(37 citation statements)

References 106 publications

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“…From the thermal point of view, there are many studies that affirm the good response of composed material of lime and hemp shives [24,31]. As the material density decreases, the thermal conductivity coefficient decreases as well and, therefore, the wall thermal performance improves.…”

Section: Shives: Role In Constructionmentioning

confidence: 99%

“…The benefits obtainable from hemp use are variegated [24]. As an example, its presence guarantees humidity control, due to its hygroscopicity, which allows it to accumulate and release humidity and consequently guarantee good hygrometric conditions in the environment.…”

Section: Shives: Role In Constructionmentioning

confidence: 99%

“…In all three cases, the mass of water was equal to half of the mass of lime. These concentrations were chosen by considering the most common mixes available in the literature and other previous studies realized at the Department of Engineering of Palermo University [24,28,32,37].…”

Section: Screening and Specimen's Preparationmentioning

confidence: 99%

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Investigation on a Bio-Composite Material as Acoustic Absorber and Thermal Insulation

2020

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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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Section: Shives: Role In Constructionmentioning

confidence: 99%

Section: Shives: Role In Constructionmentioning

confidence: 99%

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Investigation on a Bio-Composite Material as Acoustic Absorber and Thermal Insulation

2020

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“…Hemp remains the most widely used in building materials and studied in literature as a result of longterm research and availability in continental Europe, mainly in France [4]. The extensive literature on hemp-based building materials was recently reviewed by Sáez-Pérez et al [5].…”

Section: Introductionmentioning

confidence: 99%

Environmental performance of miscanthus-lime lightweight concrete using life cycle assessment: Application in external wall assemblies

Ntimugura

Vinai

Harper

et al. 2021

Sustainable Materials and Technologies

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In the UK context, miscanthus is a potential alternative perennial crop for the development of bio-based building materials. This paper presents the environmental benefits of using miscanthus shives in lightweight blocks and their potential application in wall assemblies. A systemic life cycle assessment (LCA) is carried out for miscanthus-lime blocks, and the effects of binder type and binder content are discussed. The environmental performance-based analysis reveals that miscanthus blocks can capture 135 kg CO 2 eq/m 3 for an assumed 100years life period. The impact analysis using the University of Leiden, institute of environmental science (CML) baseline (v4.4) method shows that 75% of the greenhouse gas emissions are attributable to the production of mineral binders. A reduction of binder to aggregate ratio from 2.0 to 1.5 reduces greenhouse gas emissions by 32.9%. The use of 10 wt% mineral additions can potentially stabilise blocks while having little effect on their overall environmental impacts. The environmental profiles of wall systems incorporating miscanthus-lime blocks have been evaluated in this this study. Combining miscanthus blocks with fired clay bricks enables a potential low carbon retrofitting technique for the current stock of residential buildings in the UK. Timber-framed system filled with miscanthus blocks enables a carbon storage of~97.3 kg CO 2 eq/m 2 , which presents a potential carbon offsetting strategy in new-build dwellings. Consideration should be given to the potential negative impacts related to agricultural activities for the production of miscanthus shives. The largest negative environmental impact was ozone layer depletion, where a relative difference of 12.8% was recorded between miscanthus timber-framed wall and a typical solid wall insulated with mineral wool. It appears that miscanthus-lime composites can substantially improve the environmental profile of wall assemblies and sustainability be applied in existing uninsulated masonry walls or incorporated in timber-framed new-build houses.

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“…In recent years, with the rapid growth of green construction technology, several studies based on the properties of plant-based concrete, including literature reviews, have been published. Lately, Sáez-Pérez et al studied the factors such as the quality of the aggregate, the choice of the binder, the dosage of the constituents, and the manufacturing methods affecting the properties and performance of hemp aggregate concrete [8]. Similarly, Jami et al published another review based on the properties of hemp concrete [9].…”

Section: Introductionmentioning

confidence: 99%

A Review of the Multi-Physical Characteristics of Plant Aggregates and Their Effects on the Properties of Plant-Based Concrete

Ratsimbazafy¹,

Laborel-Préneron²,

Magniont³

et al. 2021

RPM

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The use of plant aggregates obtained from agricultural co-products mixed with mineral binders to form eco-friendly insulating building materials has been initiated for a few years to bring environmentally friendly solutions to the construction sector. Several studies on different agro-resources have already been carried out, providing various information about the properties of plant aggregates and plant-based concrete. However, the characteristics of the agricultural co-product, which allow it to qualify as a plant aggregate for plant-based concrete, are not yet very clear despite the multitude of data, especially on hemp concrete. Therefore, it is important to gather numerous but very disparate pieces of information available in the literature concerning the properties of plant aggregates and their correlations with composites. This review is based on the results of 120 articles and aims to identify the characterization methods and the multi-physical properties of plant aggregates affecting those of plant-based concrete and to propose additional factors that could influence the properties of the composites. A total of 18 plant aggregates of different origins used for plant-based concrete have been listed in the literature. In France, hemp shiv is the most studied one, but its quantity is quite low unlike cereal or oilseed straws and wood transformation residues. With the existence of several characterization methods, properties like microstructure, particle size distribution, bulk density, water absorption capacity, and chemical composition of aggregates are easily and frequently determined. In contrast, data on the apparent density of particles, the skeleton density, and the hygro-thermal properties of aggregates are rare. The particle size, density, and porosity have been identified as important parameters influencing the properties of the composites. Other parameters related to the behavior of the aggregates under wet compaction and compression of their stacking can also predict the physical and mechanical properties of the obtained plant-based concrete. Dosages of the constituents should be preferred as formulation parameters for future studies assessing the impact of the aggregate properties on the composites.

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A review of the factors affecting the properties and performance of hemp aggregate concretes

Cited by 53 publications

References 106 publications

Investigation on a Bio-Composite Material as Acoustic Absorber and Thermal Insulation

Investigation on a Bio-Composite Material as Acoustic Absorber and Thermal Insulation

Environmental performance of miscanthus-lime lightweight concrete using life cycle assessment: Application in external wall assemblies

A Review of the Multi-Physical Characteristics of Plant Aggregates and Their Effects on the Properties of Plant-Based Concrete

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