Characterization of a Warm Mix Asphalt Containing Reclaimed Asphalt Pavements

Performance Assessment of Plant-Produced Warm Recycled Mixtures for Open-Graded Wearing Courses

“…Furthermore, few studies have evaluated the potential advantages and disadvantages of warm recycled mixtures, especially when polymer-modified binders were used. Earlier research suggested that the use of WMA additives, even in conjunction with high RAP content (i.e., 50% and 75%), could reduce the production temperature by as much as 30°C and could reach similar volumetric composition as well as offer greater resistance to moisture damage, rutting, and fatigue than traditional hot-mix asphalt (HMA) (2,3,9). Moreover, experience showed that WMA mixtures underwent a limited heat loss during transportation and compaction, which improved the consistency of the material density and potentially enhanced mixture durability (5).…”

“…In fact, production at reduced temperatures could imply an incomplete and not a homogeneous coating of aggregates by the binder as well as an improper process to dry wet aggregate particles. The use of RAP could help to reduce the detrimental effect of water, because RAP aggregates can be considered water-resistant materials, given the presence of the thin film of aged binder that coats RAP particles (9,13). At the same time, stockpiles of milled material tend to retain higher moisture than virgin aggregates.…”