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

Curto, Domenico; Guercio, Andrea; Franzitta, Vincenzo

doi:10.3390/en13143699

Cited by 14 publications

(11 citation statements)

References 26 publications

(34 reference statements)

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“…Indeed, Brzyski et al [ 54 ] found that for the lightest experimented mixtures, the compressive strength was below 1 MPa, and the thermal conductivity below 0.1 W/(m·K), making them better than autoclaved aerated concretes. 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.…”

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 thermal conductivity of biobased composites, which represents an essential characteristic of the insulation of buildings, was studied by Pochwała et al [ 6 ]. The same problem was analyzed by [ 7 ], who studied biocomposites made of natural lime and hemp. The physical and mechanical properties of biocomposites, hemp, and lime were determined by Brzyski et al The thermal conductivity test was carried out on samples with dimensions of 250 × 250 × 50 mm.…”

Section: Introductionmentioning

confidence: 99%

“…Curto et al [ 7 ] studied the thermal and acoustic characteristics of materials obtained by mixing natural lime, water, and hemp. Their investigations were conducted on samples of defined size and appropriate shapes.…”

Section: Introductionmentioning

confidence: 99%

Thermal and Sound Characterization of a New Biocomposite Material

et al. 2023

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Bio-based composites are increasingly used. One of the most frequently used materials is hemp shives, which is agricultural waste. However, as the quantities of this material are lacking, there is a tendency towards finding new and more available materials. Corncob and sawdust are bio by-products that have great potential as insulation materials. In order to use these aggregates, it is necessary to examine their characteristics. New composite materials based on sawdust, corncobs, styrofoam granules, and the mixture of lime and gypsum as the binder were tested in this research. This paper presents the properties of these composites obtained by determining the porosity of samples, volume mass, water absorption, airflow resistance and heat flux, which was followed by the calculation of the thermal conductivity coefficient. Three of the new biocomposite materials, whose samples were 1–5 cm thick for each type of mixture, were investigated. The aim of this research was to analyze the results of different mixtures and sample thicknesses in order to determine the optimum composite material of the proper thickness so that the best possible thermal and sound insulation could be obtained. Based on the conducted analyses, the biocomposite with a thickness of 5 cm, composed of ground corncobs, styrofoam, lime, and gypsum, proved to be the best in terms of thermal and sound insulation. New composite materials can be used as an alternative to conventional materials.

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“…However, there are still very few publications that collect data and then can be used to standardize regulations for application of materials such as hemp shives [26], straw [27], or light clay [15]. Meanwhile, these materials show a very low impact on the natural environment, and in the case of hemp shives and straw, the CO 2 emission balance in their production process is negative (due to a large quantity of CO 2 absorbed during the growth of these plants) [28].…”

Section: Introductionmentioning

confidence: 99%

The Fire Resistance and Heat Conductivity of Natural Construction Material Based on Straw and Numerical Simulation of Building Energy Demand

et al. 2022

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The motivation for research to help address climate change is a continuous process of searching for eco-friendly materials in the building industry, which will allow minimizing the negative impact of this sector on the environment. The main objective of the paper is to assess the properties of a natural resource such as straw as an eco-friendly material in various variants for use in low-energy demand construction. The research results will fill the knowledge gap in the field of numerical analyses of the energy demand of straw material buildings based on the results of the conducted laboratory tests. A test of a heat transfer coefficient was conducted with different orientation of straw stalks. Then, samples were subject to a fire resistance test to determine material behavior at 1000 °C. During the fire resistance test, the clay-based plaster was ‘burnt out’, which hardened its structure, effectively preventing flames from reaching the insulation layers in the form of straw stalks. As a result of shrinkage (no plaster mesh), the plaster cracked and turned brick-red in color. The insulation layer of straw under the plaster was charred to a depth of 3.0 mm due to the high temperature. However, when the torch was turned off, no fire spread was observed in any layer of the sample. The 3D models of the buildings were created for different eco-friendly materials applied to make external walls. The results of numerical simulation allowed determining the amount of final energy needed to heat the designed building at the level of 26.38 (kWh/m2·year). Conclusions of the above-mentioned tests indicate very good thermal insulating properties determined using the lambda coefficient of 0.069 (W/m·K) and the possible application of straw bales as an alternative for conventional construction. Research has proven that it is possible to construct a building with low energy requirements using natural, easily available waste and completely biodegradable material.

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

Cited by 14 publications

References 26 publications

Assessment of Mechanical and Thermal Properties of Hemp-Lime Mortar

Assessment of Mechanical and Thermal Properties of Hemp-Lime Mortar

Thermal and Sound Characterization of a New Biocomposite Material

The Fire Resistance and Heat Conductivity of Natural Construction Material Based on Straw and Numerical Simulation of Building Energy Demand

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