This paper presents an investigation of concrete made with recycled aggregates from Civil Construction Waste (CCW), in order to observe the influence of this material on the mechanical characteristics of concrete. The material used was collected on a construction site located in the metropolitan area of Recife-PE, and it comprised of 70% of concrete. A study was made of an experimental mix proportion in concretes made with 0%, 50% and 100% replacement of natural fine aggregate by recycled fine aggregate. The characteristics of concrete in the fresh state and in the hardest state were analysed. After obtaining the results of the experiments, mix proportion diagrams were made so that it was possible to study the correlations between the mechanical properties of the recycled concrete and analyse the parameters that influence it. It was observed that the recycled concrete had higher volumes of dry mortar because of the different density between the natural and the recycled material. The results showed that the replacement of the natural fine aggregate caused an increase in water absorption and cement consumption in the recycled concrete. There was also a decrease in the modulus of elasticity, without much damage to the compressive strength of the recycled concrete. The study indicates that the 50% proportion of replacement of natural aggregate by recycled fine aggregate was more appropriate.
Construction; Construction waste; Recycled aggregate; Concrete; Recycled concrete
