Thursday, 17 August 2017

Texas

Texas Shingle Recyclers

 

In 1997, the Dallas District of the Texas Department of Transportation (TxDOT) demonstrated separately using manufacturers' shingle scrap and tear-off shingle scrap in hot mix asphalt pavement.

In 2004, the Texas Commission on Environmental Quality (TCEQ) issued an inter-office memo authorizing only manufacturers' shingle scrap in HMA under the TCEQ Air Quality Standard Permit for Hot Mix Asphalt Plants.

In February 2009, TCEQ issued an inter-office authorization memo allowing recycled asphalt shingles (RAS) from either manufacturers shingle scrap or residential tear-offs in HMA under certain conditions. That same month, TxDOT published revised, special provisions allowing RAS in HMA.

On February 12, 2009, Richard Hyde, Director of the Air Permits Division of the Texas Commission on Environmental Quality (TCEQ), issued an Authorization Memo to allow hot mix plants entitled: “Recycled Asphalt Shingles (RAS) as Recycled Asphalt Products (RAP) in Hot Mix Asphalt (HMA) Plants”:

http://www.tceq.state.tx.us/assets/public/permitting/air/memos/ras_memo2_09.pdf

This TCEQ memo allows HMA producers to include either post-industrial or tear-off recycled asphalt shingles under the TCEQ Air Quality Standard Permit for Permanent Hot Mix Asphalt Plants.

TCEQ also regulates speculative accumulation of shingles through its municipal and industrial solid waste rules:
Waste Minimization and Recycling; Limitations on Storage of Recyclable Materials: 30 TAC §328:

http://info.sos.state.tx.us/pls/pub/readtac$ext.ViewTAC?tac_view=5&ti=30&pt=1&ch=328&sch=A&rl=Y
TCEQ also provides for Special Definitions for Recyclable Materials:

30 TAC §335.17(a)(8):

http://info.sos.state.tx.us/pls/pub/readtac$ext.TacPage?sl=R&app=9&p_dir=&p_rloc=&p_tloc=&p_ploc=&pg=1&p_tac=&ti=30&pt=1&ch=335&rl=17
For more information from TCEQ, contact:

Keith Sheedy, P.E., Air Permits Division, Technical Advisor
512.239.1556
ksheedy@tqeq.state.tx.us

Texas Department of Transportation (TXDOT) has had specifications allowing the use of RAS for many years, but the TCEQ, until recently, had not allowed use of tear-off shingles. For more information, see the TXDOT web page on asphalt roofing shingles:

http://www.txdot.gov/business/contractors_consultants/recycling/asphalt_shingles.htm

TXDOT special provisions provide for the use of RAS in HMA:
SPECIAL PROVISION 340---003 Dense-Graded Hot-Mix Asphalt (Method)
ftp://ftp.dot.state.tx.us/pub/txdot-info/cmd/cserve/specs/2004/prov/sp340003.pdf
It is important to note that this special provision states:

“Unless otherwise shown on the plans, use no more than 5% processed RAS of the total mixture weight. When RAS is used, whether in conjunction with RAP or not, calculate and ensure the ratio of the virgin binder to total binder is greater than 65% in surface mixtures and 60% in non-surface mixtures.”

SPECIAL PROVISION 341---024 Dense-Graded Hot-Mix Asphalt (QC/QA)
ftp://ftp.dot.state.tx.us/pub/txdot-info/cmd/cserve/specs/2004/prov/sp341024.pdf

TXDOT had tested tear-off shingles in HMA and participated in demonstration projects as early as 1995. In 1995, TXDOT issued “Special specification 3028: Hot Mix Asphaltic Concrete Pavement Containing Reclaimed Roofing Shingles - For project 0162-04-039 in Navarro County” for one-time use. For more information, see:

ftp://ftp.dot.state.tx.us/pub/txdot-info/cmd/cserve/specs/1995/spec/ms3028.pdf

For more information from TXDOT contact:

Robert E. Lee, P.E., TxDOT Transportation Engineer
512.506.5938
robertlee@txdot.gov

 

 


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Last Updated: ( Thursday, 18 September 2014 )