The Heat Conductivity Properties of Hemp–Lime Composite Material Used in Single-Family Buildings

Pochwała, Sławomir; Makiola, Damian; Anweiler, Stanisław; Böhm, Michał

doi:10.3390/ma13041011

Cited by 30 publications

(26 citation statements)

References 31 publications

(29 reference statements)

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“…The study proposed by Curto et al [ 55 ] has shown that the increase in the percentage of hemp shives in a mixture of lime and water decreases the thermal conductivity and increases the sound absorption values. Pochwała et al [ 56 ] found for a hemp-lime composite that the thermal conductivity ranged from 0.038–0.055 W/(m·K), depending on how much the shiv was compacted and what mixing method was applied. These properties are attributable to the porosity between the particles (about 80%) and the appearance of a porous surface [ 57 ].…”

Section: State-of-artmentioning

confidence: 99%

Assessment of Mechanical and Thermal Properties of Hemp-Lime Mortar

Parcesepe

Masi

Lima³

et al. 2021

Materials

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The use of renewable and natural materials characterized by the low environmental impact is nowadays a key issue for the sustainable development of the construction industry. For this reason, the interest for natural fibers, to be used as reinforcement in composites as an alternative to other fibers, is continuously growing. In this paper, the use of hemp for reinforcing lime mortar used as plaster is considered with a multidisciplinary approach, taking into consideration the structural and thermal performance. Natural fibers have several advantages compared to industrial ones, such as low cost, low environmental impact, biodegradability, renewable nature. Moreover, these can show remarkable mechanical performance in relation to specific weight, and sometimes, as in the case of hemp fibers, these can improve the thermal insulation capacity of the plaster. However, the experimental results on the mechanical features are still lacking, especially to assess their durability, and the variability of thermal parameters with the mechanical characteristics. Therefore, this paper proposes an experimental program, developed at Laboratory of Materials and Structures (LAMAS) of the University of Sannio (Italy), aimed at investigating the main mechanical properties (compression strength, flexural strength) of lime mortar reinforced by hemp fibers and subjected to various environmental exposures and aging processes. The characterization is completed with the measurement for the produced samples of the thermal conductivity by means of the standardized guarded hot plate technique.

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Section: State-of-artmentioning

confidence: 99%

Assessment of Mechanical and Thermal Properties of Hemp-Lime Mortar

Parcesepe

Masi

Lima³

et al. 2021

Materials

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“…The aim of the present work is to reduce the thermal conductivity or, in other words, to enhance the heat insulating capability of the lime mortar. A common practice to achieve this goal is the addition of filling particles of organic/vegetal origin, such as cork [ 6 ], hemp [ 7 , 8 ], olive stone [ 9 ], textile waste [ 10 ], straw [ 11 ], coconut [ 12 ], etc. The strategy of the present study is the addition of ceramic submicron particles, whose use and chemical composition is fully compatible with an ecological concept from the point-of-view of generating future, harmless waste for soil and subsoil.…”

Section: Introductionmentioning

confidence: 99%

Effect of Iron (III) Oxide Powder on Thermal Conductivity and Diffusivity of Lime Mortar

et al. 2021

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One of the challenges in construction is the improvement of energy efficiency of buildings. Development of construction materials of low thermal conductivity is a straightforward way to improve heat isolating capability of an enclosure. Lime mortar has a number of advantageous and peculiar properties and was widely used until the “irruption” of Portland cement. Currently, lime mortar is still used in restoration of traditional buildings or, according to the urban regulations, in catalogued constructions. The goal of the present study is the improvement of the heat isolating capability of lime mortars. The strategy of this work is the addition of iron (III) oxide powder, which is one of the possible components forming the cements, to a base lime mortar. The reason to choose Fe2O3 was two-fold. The first reason is low thermal conductivity of Fe2O3 compared to lime mortar. The second reason is that the low solubility and small size of iron (III) oxide particles have an effect on the thermal conductivity across the lime particles. The effect of iron (III) oxide powder on the thermal conductivity has been experimentally determined by the hot-box method. It has been found that the insulating capacity and thermal inertia of lime mortar is improved significantly by the addition of Fe2O3 powder, increasing the energy saving of the enclosure.

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“…There are some studies based on the same topic in the literature [20][21][22][23]. Hamzaoui et al recently investigated the mechanical performance of mortar, considering the addition of hemp [20].…”

Section: Introductionmentioning

confidence: 99%

“…The heat conductivity of a hemp-lime composite material has been recently assessed by Pochwala et al, reporting interesting values for the building insulation [22].…”

Section: Introductionmentioning

confidence: 99%

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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The Heat Conductivity Properties of Hemp–Lime Composite Material Used in Single-Family Buildings

Cited by 30 publications

References 31 publications

Assessment of Mechanical and Thermal Properties of Hemp-Lime Mortar

Assessment of Mechanical and Thermal Properties of Hemp-Lime Mortar

Effect of Iron (III) Oxide Powder on Thermal Conductivity and Diffusivity of Lime Mortar

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

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