Sustainable Concrete with Recycled Aggregates: experiences and perspective

The recycling of concrete construction and demolition wastes to obtain coarse recycled aggregates for structural concrete production represents an interesting strategy fostering circular economy in the construction sector. In this work, the effects of parent concretes on coarse recycled aggregates and on new structural concretes produced with different replacement percentages of recycled aggregates have been investigated. The quality of parent concrete seems not directly related to the mechanical properties of the concrete prepared with recycled aggregates, while the mix design plays a key role. In addition, tests on concrete specimens (i.e. plinths) have been carried out to demonstrate the feasibility of structural elements with recycled aggregates concrete. In the manuscript we present an overview of these results, highlighting pros and cons of using concrete with recycled aggregates for future developments of the concrete construction market, also stressing the influence of climate change.