From roof to road: Using recycled asphalt shingles in roadbuilding
The variables of using RAS in RAP
Many variables – including the grade of hot-mix asphalt produced, the cost for virgin liquid asphalt and alternative aggregates, landfill tipping fees, and the capital cost of equipment, as well as acquisition, processing, and handling expenses–come into play when estimating possible cost savings of using recycled asphalt shingles (RAS) in recycled asphalt pavement (RAP), according to ShingleRecycling.org.
“Savings are relative, and largely relate to the price of liquid asphalt cement (AC),” according to a National Asphalt Pavement Association (NAPA) report, based on a series of presentations at NAPA’s seminar Reclaimed/Reprocessed Materials in Hot-Mix Asphalt. Written by C. Jackie Williams, the article, Interest Mounts in Recycled Roofing Shingles: As Savings Accrue to Producers, Landfill Space is Saved, indicates that if the price of liquid AC is high, shingles offer a greater potential for savings, according to the online resource.
(For “Using RAS: Recycled asphalt shingles are an acquired taste,” which includes interviews with John Christensen, technical marketing manager for MWV Specialty Chemicals, a division of MeadWestvaco Corp (MWV) and Steve Jackson, P.E., quality control manager of Missouri-based NB West, be sure to check out the July 2012 edition of Better Roads in print or at www.betterroads.com/digital.)
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