Abstract
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.
Highlights
The general purpose of fibres application in cement-based composites is to increase material toughness by improving the resistance to crack propagation
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
Summary
The general purpose of fibres application in cement-based composites is to increase material toughness by improving the resistance to crack propagation. The capability of the sheep wool fibres to bridge the crack surfaces, and to guarantee the presence of a residual tensile strength in the post-cracking stage is remarkably reduced in high alkali cement and in high humidity conditions. This phenomenon is highlighted by the values of the residual strength and the fracture toughness in bending of wool-reinforced cement-based mortars. The main material properties, the applications in building materials, and the behaviour of cement-based matrix composites reinforced with sheep wool fibres are described
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