Physical properties and mechanical behaviour of concrete made with recycled aggregates and fly ash

This paper is a contribution to such topic. The results of a wide experimental campaign carried out on concretes made using recycled concrete aggregates (RCAs) and fly-ash (FA) in partial substitution of natural aggregates (NAs) and cement (C) are presented and discussed herein. Particularly, concretes characterised by variable water-binder ratios and produced with different percentages of RCA and variable the content of FA have been tested. Test results have allowed estimating the time evolution of the compressive strength, as well as the tensile strength at 28 days, along with some relevant physical properties, such as permeability and resistance to chloride ion penetration. The feasibility of producing structural concrete made with even significant amounts of the aforementioned recycled constituents and industrial by-products clearly emerges from the experimental results.