ABSTRACT
In this paper the mechanical performances of concrete reinforced with synthetic waste fibres have been investigated. The tests were carried out to examine the effect of the length and the dosage of synthetic waste fibres on the workability, the flexural strength and the compressive strength of concrete. Several concretes were fabricated with three weight contents, 0.25, 0.5 and 1% of 30, 50 and 70 mm long fibres. On the basis of the tests performed, the addition of synthetic waste fibres to the different concretes has a negative effect on their workability but a positive effect on their mechanical behaviour. This effect of fibres is more significant with higher amount (1%) of longer fibres (lf = 70 mm).
