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Texas Shingle Recycling Programs: A Technical Webinar

January 13th, 2011

12:00 p.m. (Noon) Central Time

Registration is Now Closed!

Presented by:  ShingleRecycling.org and
Construction Materials Recycling Association (CMRA)

Co-Sponsored by: the National Asphalt Pavement Association (NAPA) ,
Recycled Materials Resource Center (RMRC),
Texas Department of Transportation (TxDOT)

This second in a series of technical CMRA webinars will help emphasize the up front supply and processing quality control issues of shingles recycling.  Webinar participants will get a sense of the depth and breadth of both public and private asphalt shingle recycling programs and investments throughout the state of Texas.  We will hear from the Texas Department of Transportation (TxDOT) to address the TxDOT specifications for RAS in hot mix, the Texas Commission on Environmental Quality (TCEQ) to address TCEQ environmental and safety requirements, R2R Recycling to address the supply quality and processing issues from the perspective of an independent shingle recycler and APAC-Texas Inc. 

Scheduled speakers for this webinar include:

  • Dale A. Rand P.E., Flexible Pavements Branch Director, Texas Department of Transportation (TxDOT)
  • Michael Gould, Texas Commission on Environmental Quality (TCEQ)
  • Grant Wollenhaupt, Manager of Compliance & QA/QC, R2R Recycling
  • David M. Morton, Quality Control Manager, APAC-Texas Inc.
  • Dan Krivit, Senior Project Manager, Foth Infrastructure & Environment (Moderator)

Registration Fees:

$75 Full Registration
$40 CMRA Members and ShingleRecycling.org Subscribers*
Registrations will continue to be accepted online through 5 p.m. Central Time on January 12th, 2011. 
Registration is now closed.  Stay connected to ShingleRecycling.org for future webinars and events

ShingleRecycling.org
c/o Redmann Mahoney, LLC
P.O. Box 3073
Greenwood Village, CO  80155-3073

Phone: 303.779.7910
Fax: 303.779.1299

Call us with questions or concerns at: (303) 779-7910 or e-mail us.

CANCELLATION POLICY:
Cancellations received in writing on or before January 3rd will receive a full refund minus a $25 processing fee.  Cancellations received later than January 3rd cannot be refunded.

Recycled Asphalt Shingles in Hot Mix Asphalt

CMRA presented the first in a series of webinars on the use of recycled asphalt shingles (RAS) in hot mix asphalt (HMA).  This first webinar addressed how two states, Iowa and Wisconsin, recently adopted DOT specifications and implemented their recycling programs.  We heard from engineers from Iowa DOT and Wisconsin DOT, one of the Wisconsin HMA producers, and the Asphalt Paving Association of Iowa. The focus was on how the state DOT's worked with industry during the R&D period as well as during program implementation.  Speakers for this webinar included:

Cick links above to download speaker presentations

Registration for the Webinar is now ended.

If you attended please click here to take the post-webinar survey.

 

Welcome to:

Recycled Asphalt Shingles in Hot Mix Asphalt
Case Studies of New State Specifications and Implementation

June 15, 2010
11 a.m – 12:30 p.m. Central Time

Presented by:  ShingleRecycling.org and
Construction Materials Recycling Association (CMRA)

 

Please use the call-in number and code to hear the presentations
Conference Number:  605-715-4949
Conference Code:  326574#

 

Please use the public chat to the right to submit your questions.
Type your question in the lower right-hand box.
Questions will be answered at the end of the webinar.

 

If you are experiencing technical problems please email myron@redmannmahoney.com
or type them in to the public chat to the right.

 

At the end of the webinar please visit
http://www.shinglerecycling.org/content/webinar-survey
to fill out a short survey so we can improve future webinars.

 

Thank you.

 Events

INDUSTRY EVENTS

The Construction & Demolition Recycling Association is working for you!

It is the mission of the CDRA to:

  • Provide positive support and representation to the industry and CDRA members in legislative and rule-making venues that impact the recycling business.
  • Act as an advocate to promote C&D recycling and the recycle business in every manner possible that benefits CMRA members.
  • Facilitate and sponsor CDRA member interaction between the membership companies and further facilitate interaction between the membership and the many specialized services that can potentially benefit the membership such as equipment, financing, insurance and other specialized third party resources.

 

Look for more information about CDRA and the annual meeting—
or join CDRA online—by visiting www.cdrecycling.org!

Overview of Asphalt Shingle Recycling 
William Turley
Executive Director
Construction Materials Recycling Association
 Introduction
Asphalt shingle recycling is a growing, dynamic, and environmentally friendly industry that promises to divert millions of tons of materials from landfills while providing businesses an opportunity to make a profit and employ people. But how to get the shingles, how to process them once you have them, what problems will be encountered when processing them, and most importantly, what markets are available for the finished products are among the questions regarding the practice. There is no definitive tome on the subject, which is why the Construction Materials Recycling Association, with funding from the U.S. EPA Region 5, developed this site. Here you will find a tremendous amount of information about the recycling of asphalt shingles.

Asphalt shingle recycling has been called the next big thing in C&D recycling. An estimated 11 million tons of waste shingles are generated every year in the United States. The overwhelming majority of them are post-consumer, mostly from tear-offs. There is a limited amount of asphalt shingle recycling going on in North America at this time, for a variety of reasons including:

  • Resistance in the marketplace. Some potential markets do not want to try the material, or say it is not economical;
  • Lack of specifications for those markets. Some work has been done in that area, and more is being undertaken now;
  • Fear of hazardous contaminants in post-consumer shingles. The largest concern centers on asbestos.
  • Governmental regulations. Some of these are related to contaminants, some caused by regulator perceptions
Markets
Large-scale recycling of asphalt shingles is a relatively new industry to North America. The shingles have been recycled for years in Europe where several markets are active, including the following, which are also in the United States:
Hot mix asphalt (HMA)
This is considered by many to be the best potential market for recycled asphalt shingles. When asphalt shingles are new they contain anywhere from about 20% to 36% liquid asphalt. Recycling waste generated by the shingle manufacturing process can yield that valuable, petroleum-based product back when used as an additive for hot-mix asphalt. In addition, the small aggregate pieces used for shingles tend to be cubical, a superior shape for binding in road surfaces.
A few official, state-DOT sponsored studies have shown the benefits of using as much as 5% or more recycled manufacturers’ waste back into new HMA (see research section for these studies). According to the National Association of Home Builders (NAHB), 10 states allow for the material to be used on DOT jobs (list resource).The advantages of using manufacturers' waste shingles, rather than post-consumer, in hot mix asphalt is that the infeed has a more uniform level of emulsion and aggregate, making it easier to provide consistent mixes, the kind best suited for highway jobs.  
An example of this concept is done by a shingle recycling and asphalt paving company near Minneapolis. Manufacturers’ waste is ground to 1/4 in. and usually fed at a rate of 5% by volume, sometimes 10%, into the hot-mix plant. The product is used for commercial jobs and in St. Paul, where the city street commissioner allows its use on city streets. The only problem the company has had was when it only ground the shingles to 3/8 inch before feeding theminto the hot mix, and sometimes tabs would slip through and stick up in the pavement. The company now grinds itto 1/4 inch, and nobody can tell the difference between regular asphalt and the recycled shingle one, neither the graders, nor the paving crew.  
Tear-off shingle waste has been used successfully for hot mix asphalt. A paving company in San Jose, CA, used the material in its hot-mix plants. A company representative said, “We did several tests, some with just shingles added, some with shingles and RAP. All the passes we paved with them are still holding up, and they have been in place for several years.”  
Some hot-mix plant operators are still resistant to adding shingles to their mixes, report some recyclers. They say they have enough recycled asphalt pavement (RAP) in there already, or that it is not economically feasible. Also, older plants often are not equipped to properly handle the shingles safely.
Temporary roads, parking lots, driveways
Under these related applications, recycled shingles are processed to a certain size and spread over a designated area to provide a surface on which to drive. Because the specifications are less strict than hot-mix asphalt, this is a common market for post-consumer shingle waste.
Temporary roads, etc., have been done several times, in several ways. One interesting application in Harvard, IL involved a manure spreader for farming that was used to lay down tabs of manufacturers’ waste, followed by a roller to tamp them down. It worked well with the tabs, and requires no grinding. But that is unique. Most of the time, some type of grinding needs to be done in order to get the material to a good size to lay down and compact. Commonly this has been a coarse grind, about to 2 in. minus or so. Caution is advised, however, especially with post-consumer shingles as they contain nails and other metals. One large mixed C&D waste recycler that contracted out shingle grinding, was not told by the subcontractor that the magnet on the grinder was not working that day. The processed material was laid down as dust control on a gravel road near some ballparks. The result was about 20 tire punctures and some sensationalist stories on local television.  
Usually the waste shingle is put through either a tub or horizontal feed grinder, as impact crushers have been tried and found lacking for the application. One exception to that was developed by the late Kenneth Pixley in Altus, OK, where he put a load of shingles in an impactor, along with a load of RAP (Construction Materials Recycling, Vol 1, No. 20). The final product made a great parking lot material, and this practice is being continued today by a few recyclers around the country.
Roadbase
Not commonly used by itself as base, processed shingles are blended in with RAP and concrete by some recyclers to make a roadbase product. The material does provide some added bonding to the product.  
Fuel
The recovery of the fuel value of waste shingles is a well-established market in Europe. Only recently has the concept been tried in the United States, reportedly under controversy because of concern over emissions. Yet the technology exists to make it safe, and with fuel prices going up, this may become a more lucrative market.  
Cold patch mix
Ground shingles can be used alone or mixed with virgin asphalt or other materials as a patch material on roads. Some recyclers report they have had success developing the product.  
Molded products
Examples include parking blocks and stepping stones. These are small markets that probably will just stay niches, but could provide another outletto shingle recyclers.
Specifications
As stated, several states have developed specifications for shingle use in HMA mixes. And some hot-mix plant operators have created their own mix designs using the material, mostly for off-spec work. But, like recycled concrete, there is no one size and performance specification for recycled shingle use in HMA, either size or performance.
Contaminants
A main stumbling block for increased shingle recycling in the United States is the perception that shingles may contain contaminants such as asbestos at levels that are of regulatory concern. There is a lack of understanding by state and local regulatory officials of waste shingles’ properties.
It is acknowledged by the asphalt shingle manufacturers that between 1963 and the mid 1970s, some of them did use asbestos in the fiber mat of their shingles. How many batches of asbestos-tainted shingles were sold as a fire-retardant product and where they were used is information the manufacturers will not divulge, for the obvious reasons of potential asbestos litigation. But the amount of asbestos used in shingles was between 0.02% and 0.00016%, and it was only in a small portion of the manufacturers’ production (NAHB).		  
Thousands of test results of incoming asphalt shingle loads to recycling centersare available from several asphalt shingle recyclers across the country. We have compiled those tests in the section on the presence of asbestos in asphalt shingles on this website. Overwhelmingly, they show the incidence of contaminated loads to be minimal. Most sites testing report no hot loads, and some are no longer even are required to check for the material. Others that do find it are reaping small amounts.

Q. Is it technically feasible to recycle asphalt shingles?

A. Yes. Asphalt shingles are being successfully recycled at a number of locations in the United States. Asphalt shingle recycling facilities currently operate in states such as Texas, Maine, Massachusetts, and Oregon. Many other states have demonstrated the technical feasibility of recycling asphalt shingles.

Q. Can post-consumer shingles be recycled, or can only manufacturer's scrap be recycled?

A. Both can be recycled. Because scrap from shingle manufacturers comes from a known source and is not contaminated with other materials, it is usually preferred. But post-consumer scrap shingles (tear offs) can also be recycled providing materials such as paper and nails are removed. Some markets allow a greater amount of manufacturer's scrap to be used as compared to post-consumer material.

Q. What are the major recycling markets for asphalt shingles?

A. The predominant market is hot mix asphalt. The shingles provide a source of asphalt was well as aggregate. Other markets include pot-hole patch, unpaved road coverings, and construction materials.

Q. How are shingles processed?

A. Shingles must be separated from other components such as wood and paper. This is best performed at the source. Waste shingles are typically ground using a horizontal mill, although tub grinders have been used in some applications. The ground shingles are usually screened to achieve a uniform product size (depending on the market). The ground shingles must be passed under a magnet to remove nails.

Q. Are there any regulatory concerns regarding asphalt shingle recycling?

A. Yes. Many asphalt roofing products once contained asbestos, including small amounts in some brands of shingles. Historical evidence suggests that post-consumer shingle scrap typically do not test positive for asbestos. Nevertheless, sample testing and permits may still be required by a state or local regulatory agency.

Q. Is asphalt shingle recycling regulated?

A. There is no specific federal regulation pertaining to asphalt shingle recycling by itself. The National Emission Standard for Hazardous Air Pollutant (NESHAP) regulations apply to the demolition and renovation of buildings containing asphalt roofing products containing asbestos. As part of these regulations, asbestos containing waste is not supposed to be recycled into roads and is not supposed to be ground. Each state may have specific regulations pertaining to asphalt shingle recycling. See the state regulatory contacts for more information.

Q. What research has been conducted about the recycling potential of asphalt shingles?

A. Numerous laboratory and field experiments have been performed regarding the feasibility of recycling asphalt shingles. Many of these studies have been conducted by state transportation or environmental departments.

Asphalt shingles are the most popular type of residential shingle used today. The benefits derived from using asphalt shingles include weather resistance (temperature, rain, wind), ease of application, low maintenance, and low cost. Asphalt shingles can be purchased in several forms including strip shingles, laminated shingles, or interlocking shingles.  
The creation of asphalt shingles begins with an organic felt or fiberglass backing. The organic felt may be made from recycled paper or wood. This backing is impregnated with asphalt and coated with certain types of ceramics. The asphalt binds well with the felt, but not to the fiberglass. Therefore, mineral fillers are added to bind the asphalt to the fiberglass. The asphalt provides the waterproofing important to shingles. The ceramics are added to reduce the weathering effects of the sun.
For an overall description on how shingles are made and the general types of shingles and roofing, click here.  

 

Last Updated: ( Wednesday, 31 December 1969 )