Estudio de mezclas bituminosasfabricadas con RAP y escoria negra incorporando ceras a un betún con caucho, y modificadas con polímeros residuales por vía seca

Resumo

Different types of wastes have been used to replace part of the natural aggregates of bituminous mixtures, modify their properties, or improve the manufacturing process. Two lines of research have been developed: On the one hand, the use of RAP and black slag of electric arc furnace has allowed to considerably reduce the consumption of natural aggregates, and the incorporation of a wax to a rubber modified bitumen has reduced its manufacturing temperature, what is one of the major disadvantages of this type of binder. On the other hand, polymeric wastes have been used with the aim to improve the mechanical behaviour of the mixtures and support the recycling of this type of waste. The rubber from end-of-life tires improves the mechanical and surface properties of the reference mixture. In relation with the plastic polymers, the polyethylene and polypropylene improve the mechanical performance, but the first decreases the adherence between layers and the second the skid resistance. The polystyrene is the polymer with the worst mechanical behaviour. Keywords: bituminous mixture, modified mixture, warm mix, dry way, modified bitumen, rubber, polyethylene, polypropylene, polystyrene, RAP, black slag, fatty acid amide wax, Fischer Tropsch wax.