Presentation on theme: "Jim Dykes President Dykes Paving & Construction Inc. Atlanta, Georgia Presented at: The 3 rd ASPHALT SHINGLE RECYCLING FORUM."— Presentation transcript:
Jim Dykes President Dykes Paving & Construction Inc. Atlanta, Georgia Presented at: The 3 rd ASPHALT SHINGLE RECYCLING FORUM
Why We Recycle Rising costs and increased restrictions for landfillsRising costs and increased restrictions for landfills 11million tons of shingle waste is produced each year11million tons of shingle waste is produced each year Less than 5% of shingle waste is recycledLess than 5% of shingle waste is recycled
Benefits to Recycling Shingles are composed of 20% to 40% liquid ACShingles are composed of 20% to 40% liquid AC Fiber and polymers from shingles can add strength to mix designFiber and polymers from shingles can add strength to mix design Can be added to HMA to offset liquid AC costs or to create new mixesCan be added to HMA to offset liquid AC costs or to create new mixes
Bottom Line An available 11 million tons of shingle waste, containing 20% liquid ACAn available 11 million tons of shingle waste, containing 20% liquid AC 2.2 million tons of reclaimable liquid AC2.2 million tons of reclaimable liquid AC At $ per ton that’s $660 million worth of liquid asphalt every yearAt $ per ton that’s $660 million worth of liquid asphalt every year DO THE MATH!
The ProcessDoubleDeckScreen HammerMill PrimaryShredder ShingleWaste 5/16” Minus 5/16” to 3/4” Closed Loop System * Larger material is normally wasted as by product. However, we further process this material.
Sort and Prep Remove any unwanted trash from shingles such as wood or metalRemove any unwanted trash from shingles such as wood or metal Paper may stay on manufacturer rejectsPaper may stay on manufacturer rejects
Problems to Overcome Tear-offsTear-offs Intensive pre-processing More contamination than manufacturer rejects Smell from mold Environmental IssuesEnvironmental Issues Dust control E.P.A. regulations concerning stockpile locations and size.
Problems to Overcome Allocating spaceAllocating space Locations for equipment Covered or enclosed area to keep stockpile cool Crossing the economic barrierCrossing the economic barrier Most unsuccessful attempts to recycle and incorporate shingle into mixes are due to improper sizing Best approach is to add the extra equipment necessary to process shingle down to sufficient size
Equipment Primary Shredder
Equipment Double Deck Screen
Equipment Hammer Mill
Equipment Covered Stockpile
Shingle Sources Manufacturer Rejects Post Consumer Waste “Tearoffs”
Products Hot Mix AsphaltHot Mix Asphalt Cold MixCold Mix Dust ControlDust Control
Hot Mix Asphalt Shingles breaking down as they enter hot mix
Loaded Wheel Test Study Showed that Blend 1, with no fines, had the greatest strength Important to note that strength increases as the mix cures. It may initially be very soft, but with time and traffic, ruts will be significantly reduced. All lab testing performed by Pavement Technology Inc.
Field Test: Proving ground for new asphalt mix designs at Waste Management transfer station in Norcross, Georgia.
Resources The most complete information can be found at: or or