Behaviour of cementitious mortars containing different kinds of recycled aggregate

This work was aimed at evaluating both mechanical and rheological behavior of cementitious mortars prepared with three different kinds of recycled aggregate: one is made of concrete scraps obtained as rejected material from precast concrete production, one is based on recycled bricks and the last one is from a recycling plant in which demolition waste is suitably treated and, consequently, it is a miscellany of rubble. The experimental results showed that mechanical strength of the mortars prepared by substituting the natural sand with each one of these recycled aggregates is significantly lower than the reference. Nevertheless, the bond strength at the interface between mortar and brick resulted to be higher for mortars prepared with recycled aggregates and, in particular, when the fine aggregate coming from recycling of demolition waste was used.