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A NEWSLETTER TO EXPAND MARKETS FOR RECYCLED MATERIALS |
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Fall 2011 Washington State to Allow Recycled Asphalt Shingles in Paving on Select Projects in 2012
The Washington State Department of Transportation (WSDOT) is close to completing a special provision that will allow paving contractors to use recycled asphalt shingles (RAS) in select state hot mix asphalt (HMA) paving projects in 2012. Washington's current HMA paving specification allows contractors to use up to 20 percent reclaimed asphalt pavement (RAP), which is derived from old paving surfaces, in newly paved projects. The new special provision will allow contractors to increase the amount of RAP and/or use RAS in HMA on select paving projects next year. WSDOT will closely monitor the design, construction and performance of these projects to determine if increased RAP and RAS will become a standard practice in the state highway construction program. Currently, 26 states allow RAS in HMA paving mixes (see sidebar). HMA is made up of coarse and fine mineral aggregate and liquid asphalt, which serves as the binder or glue in the mix. Asphalt shingles consist of these same basic ingredients, with asphalt contents ranging from 20-30 percent, depending on age and other factors. Reclaiming the asphalt from shingles offers a cost-effective alternative to virgin asphalt and aggregate used in paving mixes. WSDOT's RAP/RAS special provision will cap the maximum total recycled binder replacement (i.e. asphalt from RAP and RAS to replace virgin asphalt) at 40 percent and will limit the use of RAS to 5 percent of the total weight of the mix. According to several local HMA producers, the use of RAS in HMA may reduce overall paving costs by as much as $5 per ton, depending on virgin material costs. If a paving contractor elects to use high RAP or RAS, they will need to perform additional preliminary materials testing, develop the HMA mix design and construct a paving test section to ensure specification conformance prior to production paving.
The special provision is the outcome of a joint effort between WSDOT and the Washington Asphalt Paving Association (WAPA), the industry group dedicated to furthering the use and quality of HMA pavements. The two organizations have a longstanding history of collaborating to improve asphalt pavement performance. “This is a WSDOT special provision but it was truly an industry-led effort,” said Joe DeVol, Bituminous Engineer for WSDOT State Materials Lab and co-chair of the effort. “The use of higher quantities of RAP and RAS in HMA has to deliver an equal or superior quality product and has to make economic sense to the industry. WAPA came to us with a proposal and we worked with them to put in place the standards and tests needed to ensure performance.” To develop the specifications for using additional RAS and RAP, a technical RAP/RAS subcommittee was formed, comprised of representatives from WSDOT, the Federal Highway Administration, US Oil, and WAPA. Subcommittee co-chair Mike Costello (Granite Construction, representing WAPA) said, “It has been a great process. Our industry wants to be green but also wants to do it right. The focus all along has been on quality, consistency, and performance. I feel confident that our work will benefit the industry financially, use more recycled material, and deliver a high quality product.” The absence of a state specification that allows RAS in paving has been a significant barrier to recycling asphalt shingles from re-roofing projects locally. With some 27,000 tons of asphalt shingles generated in King County annually, HMA paving is considered the highest and best end use for this material. LinkUp has been working closely with WSDOT, King County Department of Transportation — Road Services Division, the paving industry, and other stakeholders to test the use of shingles in paving including completing a successful paving demonstration in South King County to document the performance of a roadway paved with RAS. Learn more about the Shingles in Paving Project Demonstration. King County focusKing County Focus: King County Council approves new solid waste rate In general, as solid waste rates rise, people and businesses are more likely to look for ways to reduce waste and recycle more so they can switch to a smaller, less expensive garbage can. With this rate increase, the average residential customer who puts out one can for curbside collection will see an increase of about 82 cents per month in their garbage bill. The rate increase includes funds to pay for upgraded transfer stations with space to recycle new materials. Read more about the new rates online.
Fast factsStates Allowing the Use of Recycled Asphalt Shingles in Asphalt Paving
Overall, recycled asphalt shingle (RAS) use increased 57 percent from 2009 to 2010. In the past four years, approximately 10 additional states and the Illinois Tollway adopted new RAS specifications or amended their older specs to allow RAS derived from tear-off shingles. These specs may be “special provisions,” meaning that they are allowed on a job-by-job basis. The 10 states are: Colorado, Illinois, Indiana, Iowa, Kansas, Minnesota, Missouri, Oregon, Texas and Wisconsin. Transportation departments in California and Washington have RAS specs in draft or in progress. There are now a total of 26 state transportation departments with RAS specs:
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Forward this newsletter Printable versionIn this issue
Material highlightsIllinois allows RAS in HMA Earlier this year, IDOT Bureau of Materials and Physical Research adopted a RAS specification effective March 1, 2011. IDOT also adopted a RAS sourcing and quality control policy memorandum (revised April 1, 2011). Oregon DOT allows RAS in HMAC
Oregon State University (OSU) has been conducting a research project that helped provide background information to ODOT for its new specification. According to principal researcher Todd Scholz, an assistant professor of Civil and Construction Engineering, the final OSU report is just about finished and will soon be submitted to ODOT. Earlier this year, OSU helped ODOT develop specifications for two pilot asphalt road construction projects using RAS. One pilot test was conducted on an off-ramp of Interstate 5 in the western part of the state in the Willamette Valley. The other was on Highway U.S. 20 in the eastern part of the state, a region with high elevations and a harsh environment for pavements. New recycling requirements proposed for construction materials in Seattle
Disposal bans are already in place for asphalt paving, bricks and concrete and yard debris from construction sites.
Opening of Evergreen Shingle Recycling Carpet removal best practices See item under In the Loop below to learn about asbestos awareness training that is being offered to the flooring industry by the Washington State Floor Covering Association. Empire Today selected for flooring contract National carpet recycling talks suspended California Carpet Stewardship Program update Since July 1, 2011, an assessment of five cents per square yard has been added to the purchase price of carpet sold in California to pay for the cost of the stewardship program. The Carpet America Recovery Effort (CARE)—the stewardship organization overseeing the program—has submitted the required stewardship plan to CalRecycle (California's Department of Resources Recycling and Recovery) for review. CalRecycle must approve or comment on the plan by Nov. 29, 2011. Also currently under way is rulemaking which “seeks to add clarity and establish necessary administrative procedures covering stewardship plan approval criteria, a process for CalRecycle to accept payment for its services related to oversight and enforcement, the establishment of penalty ranges that reflect a progressive enforcement approach, and criteria for acceptance of annual reports.” Learn more. Seattle Public Utilities proposes to ban carpet from landfills in 2013 Over the past several years Seattle has already banned a number of materials, including common recyclables such as paper, cans and bottles, yard waste and food waste. Earlier this year, Seattle banned asphalt paving, bricks, and concrete from construction jobs, items which were already being recycled at a rate exceeding 90 percent. Carpet recycling options have been growing locally, among carpet sellers, recycling collection and sorting firms and new processors of recovered carpet material. Mattress recycling north of the border Mattress legislation Mattress summit! In the LoopAsbestos awareness seminars offered to flooring industry Product Management Alliance launches
Cleanscapes of Seattle merges with Recology of San Francisco |
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