The Pre-eminent Supplier– Our People MAKE IT HAPPEN PAPA 54th Annual Paving Conference Hershey, PA January, 30th 2014 RAS Best Practices

The Pre-eminent Supplier– Our People MAKE IT HAPPEN RAS Best Practices What is RAS?

The Pre-eminent Supplier– Our People MAKE IT HAPPEN RAS Best Practices Recycled Asphalt Shingles

The Pre-eminent Supplier– Our People MAKE IT HAPPEN Types 2 types of roofing shingle scraps:  Tear-offs generated during the demolition or replacement of existing roofs  Manufactured waste generated when new asphalt shingles are trimmed during production to the required physical dimensions or from "out-of-spec" shingles

The Pre-eminent Supplier– Our People MAKE IT HAPPEN Shingles typically contain:  Asphalt binder Tear-offs contain 20 – 40% binder Manufacturer waste 18 – 22% binder  40 to 60% hard rock granules and fillers  1 to 12 % fiber, felt, and miscellaneous materials Composition

The Pre-eminent Supplier– Our People MAKE IT HAPPEN Industry Guidance NAPA IS 136: Guidelines for the Use of Reclaimed Asphalt Shingles in Asphalt Pavements

The Pre-eminent Supplier– Our People MAKE IT HAPPEN Where?

The Pre-eminent Supplier– Our People MAKE IT HAPPEN  Incorporating RAS into HMA began more than 30 years ago  Pennsy Supply began using shingles in PA in 2002  PennDOT currently only allows Manufactured RAS, but may be considering allowing use of Tear-Offs Experience

The Pre-eminent Supplier– Our People MAKE IT HAPPEN  Similar concerns as for aggregate crushing, RAP processing/crushing & HMA production  Asbestos screening (if using tear-offs) Must comply with local agency requirements, which vary from state to state Environmental Concerns

The Pre-eminent Supplier– Our People MAKE IT HAPPEN  HMA mixtures produced with shingles are 100% recyclable  Saves natural resources  Saves landfill space Environmental Benefits

The Pre-eminent Supplier– Our People MAKE IT HAPPEN  Various types of industrial grinders can be used to grind the Shingles into a usable product Most use shredding approach Water is used during processing for dust suppression and to aid in shredding, but must be controlled Processing Shingles

The Pre-eminent Supplier– Our People MAKE IT HAPPEN Processing Shingles  Separate out the non-shingle debris before incorporating into HMA  Keep all non-shingle debris separated

The Pre-eminent Supplier– Our People MAKE IT HAPPEN  Ensure proper sizing of the ground Shingle particles Finer is better  Oversized Shingle particles impact: Contribution to P be Mat texture Processing Shingles

The Pre-eminent Supplier– Our People MAKE IT HAPPEN  Test RAS for gradation & AC Content frequently as they are being shredded  Keep RAS of different AC contents in separate stockpiles Processing Shingles

The Pre-eminent Supplier– Our People MAKE IT HAPPEN Pre-Processing Processing Shingles Post-Processing

The Pre-eminent Supplier– Our People MAKE IT HAPPEN Processing Shingles  In some cases RAS is blended with a carrier aggregate: Used to keep Shingles from conglomerating & allows for more efficient flow through cold feed bin RAP, 3/8” Stone, washed screenings, Natural Sand can be used

The Pre-eminent Supplier– Our People MAKE IT HAPPEN  Store RAS in covered environment to control moisture  Shingles left exposed to rain can have very high moisture contents (12%+)  RAS holds more moisture than RAP Storage

The Pre-eminent Supplier– Our People MAKE IT HAPPEN  Not always a best practice to keep the shingles bin full  Best practice to empty the shingles bin when production complete or production is stopped for extended period Plant Photo courtesy of Astec Industries

The Pre-eminent Supplier– Our People MAKE IT HAPPEN  Ensure the RAS feed system is calibrated and maintained Plant Photo courtesy of Astec Industries

The Pre-eminent Supplier– Our People MAKE IT HAPPEN  Load cells or weigh belts measure the amount of RAS as it is metered into plant Plant Photo courtesy of Gencor Industries

The Pre-eminent Supplier– Our People MAKE IT HAPPEN  Watch for build-up at the RAP collar, especially for plants with smaller throats Plant

The Pre-eminent Supplier– Our People MAKE IT HAPPEN  Consider covering conveyors and transfer points Plant

The Pre-eminent Supplier– Our People MAKE IT HAPPEN  Test moisture content of RAS often while incorporating into mix – even more frequently if RAS stockpiles are not covered Plant

The Pre-eminent Supplier– Our People MAKE IT HAPPEN  RAS has been used successfully in batch and drum facilities May need to increase dry & wet mix time in batch plants Plant

The Pre-eminent Supplier– Our People MAKE IT HAPPEN Higher plant production temperatures may be needed to ensure all moisture is removed from RAS & to maximize blending of RAS binder with virgin binder Temperatures

The Pre-eminent Supplier– Our People MAKE IT HAPPEN Higher plant production temperatures may be needed to ensure all moisture is removed from RAS & to maximize blending of RAS binder with virgin binder Temperatures

The Pre-eminent Supplier– Our People MAKE IT HAPPEN Field  RAS mixtures can behave differently than virgin mixtures or RAP mixtures, which doesn’t necessarily make them bad: RAS mixtures tend to be more sensitive to fluctuations in production temperatures RAS mixtures are typically stiffer so may require additional effort to compact RAS mixtures may make hand-work more difficult, so think through paving sequence before you begin paving

The Pre-eminent Supplier– Our People MAKE IT HAPPEN Summary  Shingles require processing  Need consistent stockpiles of RAS  Should cover stockpiles of RAS  Test gradation & moisture content of RAS often  RAS feed must be calibrated & controlled  Higher production temperatures may be needed  Be prepared to manage deltas in mix characteristics when placing RAS mixtures

The Pre-eminent Supplier– Our People MAKE IT HAPPEN Thank you