Natural fibers reinforcement for earthen building components: Mechanical performances of a low quality sheep wool (“Valle del Belice” sheep)

Parlato, Monica C. M.; Cuomo, Massimo; Porto, Simona M.C.

doi:10.1016/j.conbuildmat.2022.126855

Cited by 29 publications

(36 citation statements)

References 37 publications

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“…Wool fibers are durable and flexible; their mechanical characteristics are comparable to or exceed the values of other natural fibers, e.g., cotton and coir/husk [1,11]. Thus, wool is used as fiber reinforcement in mortars and concrete [9,12,13], polymer composites, and laminates [2,[14][15][16][17], increasing the value of the wool fiber. Recently, wool has become an alternative material in some high-tech industrial sectors, e.g., it is used in reinforcing compounds for additive manufacturing [11,18].…”

Section: Introductionmentioning

confidence: 99%

“…Sia et al [23] reported strength variations up to 16% for banana fibers of different lengths. Parlato et al [13] studied low-quality wool of a Sicilian sheep breed and reported on strength decrease within the fiber diameter: from 200 MPa for 50 µm fibers down to 50 MPa for 90 µm fibers.…”

Section: Introductionmentioning

confidence: 99%

“…The twoparameter Weibull distribution is among the most used models for assessing natural fibers' strength scatter characteristics [22][23][24][25]. For fibers possessing essential diameter variations, the modified Weibull model is applied to obtain accurate predictions [13,22,25].…”

Section: Introductionmentioning

confidence: 99%

“…Wool is hydrophilic and absorbs water up to 30% of its weight [2,11]. Absorbed moisture plasticizes the fibers, increasing their stretching ability while reducing the elastic and strength characteristics [9,13]. In order to fully characterize the mechanisms of environmental impact on fibers, it is necessary to evaluate not only the actual change in their properties but also the change in the distribution parameters depending on fiber geometrical characteristics.…”

Section: Introductionmentioning

confidence: 99%

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Environmental Effects on Strength and Failure Strain Distributions of Sheep Wool Fibers

et al. 2022

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Sheep wool is an eco-friendly, renewable, and totally recyclable material increasingly used in textiles, filters, insulation, and building materials. Recently, wool fibers have become good alternatives for reinforcement of polymer composites and filaments for 3D printing. Wool fibers are susceptible to environmental degradation that could shorten their lifetime and limit applications. This study reports on the mechanical properties of sheep wool fibers under the impact of humid air and UV irradiation. The results of single fiber tensile tests showed a noticeable gauge length effect on the fibers’ strength and failure strain. Long (50 mm) fibers possessed about 40% lower characteristics than short (10 mm) fibers. Environmental aging decreased the elastic modulus and strength of the fibers. Moisture-saturated fibers possessed up to 43% lower characteristics, while UV aging resulted in up to a twofold reduction of the strength. The most severe degradation effect is observed under the coupled influence of UVs and moisture. The two-parameter Weibull distribution was applied for the fiber strength and failure strain statistical assessment. The model well predicted the gauge length effects. Moisture-saturated and UV-aged fibers were characterized by less extensive strength dependences on the fiber length. The strength and failure strain distributions of aged fibers were horizontally shifted to lower values. The results will contribute to be reliable predictions of the environmental durability of sheep wool fibers and will extend their use in technical applications.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Environmental Effects on Strength and Failure Strain Distributions of Sheep Wool Fibers

et al. 2022

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“…In the civil construction industry, it is possible to find natural fibers applied in soil stabilization, infrastructure, bridges, reinforced concrete, and structural reinforcement mortars [17]. The addition of fibers to soil-based building materials has the benefits of improving tensile strength, ductility, impact resistance, city, and reduction in drying shrinkage [18].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Technological Properties of Soil–Cement Bricks with Incorporation of Coconut Fiber Powder

Ferreira

Cecchin

Valadão

et al. 2022

Eng

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The objective of this work was to evaluate the effect of partial replacement of soil by different percentages of coconut fiber powder in the manufacture of soil–cement bricks. The reference mix ratio of 10:1 (soil:cement) in volume was used for the manufacture of bricks, in addition to the partial replacement of soil mass by 5, 10, and 15% of coconut fiber. The characterization of the raw materials was performed with the analysis of the granulometry, together with technological tests, such as mechanical compressive strength and water absorption. As a result, it was observed that the soil has 34.30% clay and 62.80% sand, characterizing a sandy-clay soil type and the coconut fiber powder was characterized as a fine aggregate. The mechanical compressive strength tests showed a decrease in their average values according to the increase in the incorporation of coconut fiber into the bricks. It was concluded that the results of the mechanical compressive strength and some of the water absorption are in disagreement with the Brazilian technical standard. This conclusion corroborates other studies that show the difficulty in standardizing reference mixtures and working with soil, which is a highly heterogeneous material.

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Traditional Construction Systems and Their Sustainable Opportunities: Adobe and Rammed Earth

López-León,

González-de-la-Fuente,

Lizárraga-Mendiola

2024

The Latin American Studies Book Series

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Natural fibers reinforcement for earthen building components: Mechanical performances of a low quality sheep wool (“Valle del Belice” sheep)

Cited by 29 publications

References 37 publications

Environmental Effects on Strength and Failure Strain Distributions of Sheep Wool Fibers

Environmental Effects on Strength and Failure Strain Distributions of Sheep Wool Fibers

Evaluation of the Technological Properties of Soil–Cement Bricks with Incorporation of Coconut Fiber Powder

Traditional Construction Systems and Their Sustainable Opportunities: Adobe and Rammed Earth

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