Pit & Quarry, May 2015
SPECIAL SECTION SAFETY ENVIRONMENTAL was equivalent or even bit better than the straight limestone section Dingeldein says I believe with recycled concrete materials theres some extra benefit from having freshly crushed material that re exposes fresh material which cements better so you get a stronger base material compared to straight 304 limestone Recycling growth According to the National Asphalt Pavement Association the EPA and Federal Highway Administration identified RAP as Americas number one recycled product as early as 1993 Nelson Aggregate processes both concrete and asphalt In 2013 RAP usage reached about 678 million tons a 21 percent increase from 2009 More than 99 percent of asphalt reclaimed from roads and parking lots was used in new pavement Dingeldein says Virginia and North and South Carolina DOTs have used recycled products in their projects In Virginias case theres no mention of recycled concrete aggregate RCA in their state strategic plan however it is approved for use in state projects Often when a state uses RCA theyre recycling miles of it and set up a processing plant right on the road site Dingeldein says Wisconsin is one state thats done this for a long time If nothing else RCA is often used in the base course In Cleveland recycled concrete sellers have to produce documentation showing their product is 4000 or higher PSI If they arent able to provide that documentation their product is usually more difficult to sell P Q Loretta Sorensen is a freelance writer in Yankton S D She produces material on a variety of topics serves as a ghostwriter and has authored her own books Additional information about Nelson Aggregate Co is available at www nelsonaggregate com More details about the growth of recycled asphalt products in America may be found at www asphaltpavement org www pitandquarry com May 2015 PIT QUARRY 27
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