Pavements continue to be among the most recycled materials on the planet. Over the past several decades, the asphalt industry has successfully innovated the use of reclaimed asphalt pavement, or RAP. This has inarguably led to significant environmental and economic benefits. To move the needle further in this direction, recent innovations in the area of warm-mix asphalt (WMA) have been shown to reduce the required energy associated with asphalt production and laydown, the fractionation of RAP (FRAP) and the use of recycled asphalt shingles (RAS) to push asphalt mixtures to even higher levels of asphalt binder replacement (ABR). The movement to WMA turned out to be relatively straightforward. WMA is now used extensively in certain regions of the U.S., for environmental and economic reasons. It also is a means to facilitate compaction, extend haul range and increase available time for compaction.
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