Rutting Performance of Dense HMA using Asphalt Rubber and Recycled Aggregates

Description

The proper disposal of construction and demolition wastes and used vehicle tires has become a major solid residues management problem in many countries. In this context, the choice for rubber-modified asphalt mixes using aggregates recycled from construction and demolition (ARCD) can provide a combined solution for both problems. This research used a conventional binder (CAP 50/70 penetration grade), asphalt rubber AR (CAP 50/70 + granulated rubber) produced via wet process, aggregates recycled from construction and demolition (ARCD) and natural aggregates crushed from dolomitic limestone. Four different types of dense hot mix asphalts (Mix 1 – limestone + CAP 50/70; Mix 2 – limestone + AR; Mix 3 – ARCD + CAP 50/70 and Mix 4 – ARCD + AR) were produced and evaluated with regards to permanent deformation using the French Wheel Tracking Test (FWTT) apparatus. Mixtures 3 and 4, produced with recycled aggregate (ARCD), either using conventional binder or asphalt rubber, showed the best behavior and attained permanent deformation values less than the maximum allowable by the French norm (<10%). However, Mix 4 (ARCD+AR) required the highest asphalt content compared to the other mixtures.