Better Roads

November 2013

Better Roads Digital Magazine

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Page 18 of 80

RoadScience Photos courtesy of Tom Kuennen by Tom Kuennen, Contributing Editor Raw RAP stockpile (foreground) is reduced to consistent sizes by a mobile impact crusher. Plant Management of RAP/RCA Processing and storage makes reclaimed asphalt pavement and recycled concrete aggregate useful as aggregate. I n the past two decades, reclaimed asphalt pavement (RAP) and recycled concrete aggregate (RCA) have taken their places among materials commonly used for roadbuilding. There is no stopping the growth of recycled and reclaimed materials in construction – not just road construction – and thoughtful processing of reclaimed materials results in highquality RAP and RCA for reuse in pavements, road bases, fill and foundations. Use of RAP and RCA is growing dramatically as road agencies accept them more and more in their specs. But because RAP and RCA come from a variety of sources, they must be processed – "fractionated" – and characterized prior to use in mixes as an engineered, value-added product. Recycled materials producers and asphalt mix providers must produce recycled aggregates – and maintain stockpiles – as diligently as they do virgin materials. There's a reason for it. When RAP and RCA are treated like virgin aggregates in the yard – being crushed, screened, tested, blended, protected and tested again – they can be used reliably in pavement mixes and road bases as engineered aggregates. Better Roads November 2013 17

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