Effect of Sheep Wool Fibers on Thermal Insulation and Mechanical Properties of Cement-Based Composites

Fiore, Vincenzo; Bella, Giuseppe Di; Valenza, A.

doi:10.1080/15440478.2019.1584075

Cited by 41 publications

(30 citation statements)

References 25 publications

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“…Some researchers showed that, with the addition of sheep wool, density and thermal insulation improve, but, at the same time, the mechanical properties of the composite decrease [39]. Fiore et al [24] investigated the mechanical behavior and thermal conductivity of a cement mortar with various length and different contents (i.e., 13%, 23%, and 46% by wt. of cement) of wool fibres.…”

Section: Thermal and Acoustic Propertiesmentioning

confidence: 99%

“…A fibre length of 55 ± 5 mm and a dosage of 0.35% had an insignificant influence on the compressive strength, but a higher dosage or a smaller length of the fibre decreased the value of the compressive strength. Fiore et al [24] investigated the mechanical behaviour of a cement mortar with various length and different contents (i.e., 13%, 23%, and 46% by wt. of cement) of wool fibres.…”

Section: Mechanical Behaviormentioning

confidence: 99%

“…Indeed, sheep wool is comparable to other insulation materials, such as mineral wool and calcium silicate [18]. The results of some experimental measurements show that sheep wool is competitive in terms of thermal conductivity and acoustic absorption [19][20][21][22][23][24][25]. Korjenic et al [18] showed that sheep wool is characterized by high hygroscopicity, which made it capable to absorb moisture, prevent condensation and regulate humidity in insulation materials.…”

Section: Introductionmentioning

confidence: 99%

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Wool-Reinforced Cement Based Composites

Jóźwiak–Niedźwiedzka

Fantilli

2020

Materials

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In this paper, an overview of the latest research activities in the field of cement-based composites incorporating sheep wool reinforcement is presented. First, the characteristics of this type of natural fibre are described. Then, the current use of sheep wool fibres in cement-based composites is discussed. The research problems regarding the properties of cement matrix composites reinforced with sheep wool are divided into four groups: thermal and acoustic properties, mechanical behavior, durability issues, and microstructure aspects. The latter two groups are analysed separately, because both durability and microstructure are of particular importance for future applications of wool reinforcement. Finally, the main directions of future researches are presented.

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Section: Thermal and Acoustic Propertiesmentioning

confidence: 99%

Section: Mechanical Behaviormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Wool-Reinforced Cement Based Composites

Jóźwiak–Niedźwiedzka

Fantilli

2020

Materials

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“…On the other hand, although the technological development and the appearance of a variety of synthetic fibers, the trends of using natural fibers instead of synthetic fibers continue to increase due to their availability, economic and energetic cost, and their ecological aspect, as well as the low technicity necessary for their production [17,18]. In this context, sheep wool fibers have comparable characteristics with rock wool and mineral wool in thermal insulation [19].…”

Section: Introductionmentioning

confidence: 99%

“…These natural fibers are characterized by a high elastic modulus, in the range of 1 to 4 GPa, equivalent to that of plastic fibers used as reinforcement fibers in the cementitious mix [20]. It has proved that sheep wool composites' mechanical and thermal performance has improved significantly [17,[20][21][22]. Generally, using sheep-wool fibers negatively affects the mechanical qualities of composites [18,23,24].…”

Section: Introductionmentioning

confidence: 99%

Unfired Clay-Cork Granules Bricks Reinforced with Natural Stabilizers: Thermomechanical Characteristics Assessment

et al. 2021

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Cork is an ecological, natural, and renewable additive, an excellent thermal and acoustic insulator. All these attributes encourage its use in the building sector. Adding this additive to the Earth leads to a more lightweight composite with better thermal performance than the Earth alone. Unfortunately, the mechanical performance of this composite is degraded significantly, limiting its use in construction applications. The authors propose in this study to stabilize the clay-cork composite using natural stabilizers. A chemical stabilization was tested using local quick-lime, in addition to a physical stabilization using natural sheep-wool fibers. The primary purpose is to propose eco-friendly construction material with enhanced thermal and mechanical properties and the lowest environmental impact based on local and ecological raw materials to encourage more sustainable and low-energy constructions. First, physicochemical and mineralogical characterization of used clay was investigated. Then, an experimental investigation was conducted to identify the lime content that allows the optimal stabilization for the used clay. In this context, many different specimens of Bensmim soil stabilized with lime at six many contents 0, 10, 20, 30, 40, 50, and 70% were prepared and tested. The obtained results showed that the optimal lime content for the better stabilization of the used soil is about 30%. Next, an experimental study of thermomechanical properties was conducted on unfired clay bricks mixed with expended cork granules and stabilized by the addition of variable proportions of quick-lime 0, 10 and 30% and sheep-wool fibers 0, 1, and 2%. The mechanical performance of the specimens was investigated in terms of compressive and flexural strengths. At the same time, thermal quality was qualified through evaluating thermal conductivity using the steady-state Asymmetrical Hot Plate test method. The very encouraging experimental findings showed that using lime and sheep-wool fibers at the studied addition content resulted in lightweight composites with lower thermal conductivity and higher compressive and flexural strength than reference samples. The highest thermomechanical performances are obtained with clay-cork blocks reinforced with 30% lime content and 2% sheep-wool fibers. This block recorded values of 583 kg/m3, 0.155 W/m/K, 1.55 MPa, and 3.91 MPa, for bulk density, thermal conductivity, flexural and compressive strength respectively, compared to 765 kg/m3, 0.238 W/m/K, 0.96 MPa and 2.29 MPa for control samples. New material presents lightweight material for both improved thermal and mechanical qualities encouraging its use in building applications. Doi: 10.28991/cej-2021-03091778 Full Text: PDF

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