Effects of the Incorporation of Waste Fibres on the Cracking Resistance of Mortars: A Review (Pages: Pages 38-46)
Cinthia Maia Pederneiras1, Maria do Rosário Veiga2 and Jorge de Brito1
1Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisboa, Portugal; 2Departamento de Edifícios, LNEC – Laboratório Nacional de Engenharia Civil, Av. do Brasil 101, 1700-066 Lisboa, Portugal
Abstract: The environmental awareness has prompted the construction industry to develop sustainable materials. Fibre-reinforced composites are considered a pontential alternative to improve the durability of construction materials. These additions may also increase the deformation capacity and the energy absorption of the composite. Besides increasing the coating durability, recycled fibres may promote environmental gains. This paper presents a review of the researches done with recycled fibres, both synthetic and natural, and discusses fibre characteristics, properties and treatments to improve the performance of the composites. Therefore, considering previous studies, this work intends to analyse the incorporation of different kinds of recycled fibres to achieve better performance of cement mortars in terms of cracking resistance, impact strength and durability, without significant decrease in mechanical strength and water absorption. This article also intends to characterise the feasibility of the incorporation of waste fibres in cement mortars that could reduce their modulus of elasticity and increase their deformation capacity, to improve their resistance to cracking, based on previous works of the literature. The results suggest that the fibre incorporation provides an improvement in the cracking performance of the mortars. Parameters as length, type and treatment of the fibres are meaningful.
Keywords: Mortar, Recycled fibre, Cementitious composite, Coating, Cracking resistance, Toughness.