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When construction and demolition (C&D) waste is applied in concrete as aggregate, its porosity leads to a concrete with a reduced strength. Normally, this drawback induces to mixdesigns with higher cement contents in order to compensate the strength reduction, which also increases the environmental impact of the material. The experimental study carried out in this work demonstrates that the flexural strength reduction is diminished with steel fibres reinforcement. This condition could compensate this drawback for some applications where the use of fibres is already forecasted. Recycled C&D aggregates with different density levels were produced to be added in concrete with different steel fibres contents. The experimental and numerical results demonstrate that the reduction of C&D aggregates oven-dry (OD) density will lead to a reduction on compressive strength without any influence of the fibres. Instead, the use of steel fibres could mitigate the flexural strength decrease. The performance of the concrete with recycled aggregates were approximated to the conventional concrete when the fibre content was increased on the first one. The behaviour was even closer when the w/c ratio was higher and the matrix strength was reduced for both types of concrete.

INFLUENCE OF LOW CONTENT OF STEEL FIBRE ON CONCRETES PRODUCED WITH RECYCLED COARSE AGGREGATES WITH DIFFERENT LEVELS OF DENSITY