Acoustical properties of hemp concretes for buildings thermal insulation: Application to clay and lime binders

Degrave-Lemeurs, Matthias; Glé, Philippe; Ménibus, Arthur Hellouin de

doi:10.1016/j.conbuildmat.2017.11.064

Cited by 59 publications

(21 citation statements)

References 29 publications

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“…Noise insulation in building is also an important issue to be taken into account, in order to achieve optimal comfort conditions. The acoustic properties of plasters and concrete have been widely investigated in the literature [11][12][13][14]. Buratti et al [11] studied the effect on the acoustic properties of innovative insulating coatings made of natural calk and granular silica aerogel, with a final coat of 2 mm.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Natural Gypsum Materials and Their Composites for Building Applications

et al. 2019

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Building retrofitting plays a key-role in energy saving and a growing interest is focused on insulating materials that allow a reduction in heat loss from envelopes with low thickness, by a process of reducing heating and cooling demand. In this context, a complete characterization of the physical properties of Moroccan natural gypsum materials was carried out. Basic information on the mineralogical, microstructure, thermal, mechanical, and acoustic characteristics of the rocks sampled from two Moroccan regions is provided. It was found that mineralogy, porosity, and water content are the main factors governing the development of the structure and the strength of the samples. The measured values of the porosity were 8.94%, the water content varied between 2.5–3.0% for the two studied typologies, coming from Agadir and Safi, respectively. Gypsum powder was used for fabricating samples, which were investigated in terms of thermal and acoustic performance. Thermal properties were measured by means of a hot disk apparatus and values of conductivity of 0.18 W/mK and 0.13 W/mK were obtained for Agadir and Safi Gypsum, respectively. The acoustic performance was evaluated in terms of absorption coefficient and sound insulation, measured by means of a Kundt’s Tube (ISO 10534-2). The absorption coefficients were slightly higher than the ones of conventional plasters with similar thickness. A good sound insulation performance was confirmed, especially for Safi Gypsum, with a transmission loss-value up to about 50 dB at high frequency.

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Section: Introductionmentioning

confidence: 99%

“…The acoustic properties of hemp concretes were investigated in [14] in terms of the absorption coefficient and sound insulation. The hemp-clay and hemp-lime mixtures are characterized by a similar acoustic behavior, in which binder fluidity and clay type have no effect.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Natural Gypsum Materials and Their Composites for Building Applications

et al. 2019

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“…The thermal properties of hemp-lime materials are found comparable to those of commonly-used lightweight insulation material with similar density [ 36 ]. However, the available research underlines that the optimization of the mechanical properties of hemp concretes can affect the value of achievable thermal conductivity [ 37 ]. For this reason, it is important to carry out both characterizations for new materials with the aim to develop a product that is structurally functional, energy-efficient, and environmentally sustainable.…”

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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“…The addition of hemp fibers can also reduce the density, shrinkage and cracking of soil concrete and improve the thermal properties [6,7]. The acoustic and thermal properties of soil concrete could be better than ordinary concrete, which are explained by the use of clayey soil and hemp fibers [8].…”

Section: Introductionmentioning

confidence: 99%

Design of a new soil concrete as an eco-material: Effect of clay and hemp fibers proportions

Chinh

Tan

2020

STCE

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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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Acoustical properties of hemp concretes for buildings thermal insulation: Application to clay and lime binders

Cited by 59 publications

References 29 publications

Characterization of Natural Gypsum Materials and Their Composites for Building Applications

Characterization of Natural Gypsum Materials and Their Composites for Building Applications

Assessment of Mechanical and Thermal Properties of Hemp-Lime Mortar

Design of a new soil concrete as an eco-material: Effect of clay and hemp fibers proportions

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