Summary of 3rd Asphalt Shingles Recycling ForumAs of 12-18-2007
Related studies on virgin roofing asphalt, reclaimed asphalt pavement, and run-off from asphalt pavement indicated PAH concentrations below the laboratory detection limits.
PAHs are emitted during normal HMA production
Pollution control equipment reduces PAH concentrations
The effect of using post-consumer asphalt shingles on PAH emission during HMA production is unknown
A study in Texas stated they would investigate the issue of PAH emissions in HMA production. (Note: no data yet.)
It is not anticipated that clean, uncontaminated asphalt shingles would cause PAH emissions to be significantly different than virgin asphalt
ECONOMICS & MARKETS:
Wayne Gjerde, Minnesota Pollution Control Agency 651-215-0270;
The World’s oil production is now expected to peak sooner than originally forecasted
Coal is also expected to be expended as predicted by maximum use rates
Virgin asphalt savings due to use of recycled shingles into HMA can be significant
Other less tangible benefits of recycling shingles include:
Longer term price stability for HMA producer and paving customer
Makes pricing more competitive.
Helps projects that are seeking “green” credits (e.g., LEED)
Shawn McMullen, Systech Environmental Corporation, a subsidiary of LaFarge NA 937-643-1240,
Alternative Fuel in Cement Kilns is qualified by MSDS, waste profiles, analysis, testing of loads
Each plant is tested to prove emissions meet Federal/State/Provincial Standards and requires operating permits (air and waste management).
Economics drivers of Asphalt Shingles as fuel in cement kilns:
High landfill tipping fees or landfill ban on C&D waste
Plant with specific coal mill technology & low production requirements
Limited alternative fuel choices
Change that will increase the use of Shingles as an Alternative Fuel
Legislative control to move energy waste from landfills to re-use
Increased cost of primary fuels like coal and pet coke
Development of collection, separation and processing systems to prepare shingles for fuel use
Ben Brock, Astec Industries, Inc.
About 25 contractors in North America run RAS in HMA as standard practice
675-750 million tons of HMA produced per year (or 2.25 to 2.50 per person) in the U.S.
About 18 billion tons of HMA pavement is in place today
About 3,900 HMA plants in U.S. today
77 shingles manufacturing plants in U.S. today generating about 1.3 million tons of scrap each year
8.5 million tons per year of post-consumer (tear-off) shingle scrap mostly going to landfill at a cost of $15 to $100 per ton
Volumetrics force knowing the AC content in RAS
Prepared by ShingleRecycling.org and DKAPage 9 of 11