Evaluation of hot mix asphalt with incorporation of recycled concrete aggregates

The generation and management of industrial solid waste is considered an environmental problem worldwide. Reason why, several studies have focused on the implementation of Construction and Demolition Waste (RCD) for pavement layers, focusing mainly on the use of Concrete Recycled Aggregates (RCA). The objective of this study was to determine the impact of the implementation of the RCA in hot asphalt mixture on its physical-mechanical properties, under three scenarios: i) replacement of the coarse fraction, ii) fine and iii) 100% of the aggregate granulometry conventional (AC). The monotonic load resistance of the mixtures (Marshall and Indirect Traction - IT tests) and the wear resistance Cantabro were evaluated. The substitution of the fine fraction of AC by RCA significantly reduces the resistance under monotonic load of the control mixture. When replacing the coarse fraction, the design criteria of the control asphalt mixture are met and the IT is increased, but it is necessary to slightly increase the asphalt content. By replacing all the aggregates with RCA, a satisfactory behavior was obtained in the face of the action of monotonic charges, but it is also necessary to significantly increase the asphalt content. An increase in RCA in the mixture increases the loss from Cantabro wear.