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CalAPA 2015 Fall Conference
Chuck Suszko
October 28, 2015
Copyright 2015 California Department of Transportation. All Righ...
 Caltrans has used Rubberized Hot
Mix Asphalt (RHMA) for more than
20 years.
 Usage of crumb rubber increased
as RHMA be...
3
New Caltrans RHMA policy:
RHMA is the pavement surface
course of choice when evaluating
alternatives for a project.
4
 In July 2013, Caltrans
implemented the use of
Performance Graded Modified
(PG-M) asphalt binder with
minimum 10 percent ...
 Public Resources Code 42703
requires Caltrans use crumb
rubber in asphalt paving
materials.
 To meet this crumb rubber ...
 Caltrans has recently changed its
mission statement to include
sustainability.
 Caltrans goals include both
Sustainabil...
 It is time for an innovative
approach for drastically increasing
the amount of crumb rubber used
in California’s pavemen...
 The proposed increased use of
crumb rubber in pavements is not
based on the historical engineering
approach of using cru...
 Caltrans proposal to increase the
use of crumb rubber in pavements
will be accomplished by a
dramatic change that will r...
 This “Green” asphalt proposal
would require the use of 5
percent crumb rubber in all
asphalt binder that is currently
cl...
 Implementation of Performance
Graded Asphalt with 5 percent
crumb rubber in place of
unmodified asphalt binders in
Calif...
 For Caltrans an additional
2,300,000 PTE’s could be used by
requiring Performance Graded
Asphalt with 5 percent crumb
ru...
 Caltrans could increase PTEs used
in pavements by 51 percent which
is a dramatic increase in crumb
rubber usage.
14
 In March 2015 Caltrans met with
industry stakeholders to discuss
Caltrans PG+5 proposal and other
industry proposed alte...
 March 2015 meeting alternatives:
1. Caltrans PG+5
2. Caltrans PG+5 with changes
3. Dry Process
4. Field blend
16
 The alternatives will be evaluated in
four phases:
Phase 1: Laboratory Testing
Phase 2: Field Construction
Evaluation
Ph...
18
 This effort will follow the the Rock
Products Committee process.
 Draft Scoping document for
Increasing Crumb Rubber Us...
 Secure needed research funding.
 The total estimated research costs
for this project is $635,000.
 Caltrans is partner...
 Increasing Crumb Rubber Usage -
Small Amounts of CRM in Hot Mix
Asphalt scoping document
approved on October 09, 2015.
...
 Sub Task Group to evaluate the
alternatives in terms of the
following factors:
1. Technical
2. Environmental
3. Economic...
Target Timeline
 Lab Testing (December 2016)
 Environmental and Life Cycle
Analysis (July 2017)
 Pilot Projects (Octobe...
Contact:
chuck.suszko@dot.ca.gov
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Increasing Crumb Rubber Modifier (CRM) Use in CA

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Presentation by Chuck Suszko of Catlrans at the CalAPA 2015 Fall Asphalt Pavement Conference Oct. 28, 2015 in Sacramento.

Published in: Engineering
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Increasing Crumb Rubber Modifier (CRM) Use in CA

  1. 1. CalAPA 2015 Fall Conference Chuck Suszko October 28, 2015 Copyright 2015 California Department of Transportation. All Rights Reserved
  2. 2.  Caltrans has used Rubberized Hot Mix Asphalt (RHMA) for more than 20 years.  Usage of crumb rubber increased as RHMA became commonly used on Caltrans projects. 2
  3. 3. 3
  4. 4. New Caltrans RHMA policy: RHMA is the pavement surface course of choice when evaluating alternatives for a project. 4
  5. 5.  In July 2013, Caltrans implemented the use of Performance Graded Modified (PG-M) asphalt binder with minimum 10 percent CRM. 5
  6. 6.  Public Resources Code 42703 requires Caltrans use crumb rubber in asphalt paving materials.  To meet this crumb rubber usage goal Caltrans must continue to seek new ways of using recycled tires in California pavements.. 6
  7. 7.  Caltrans has recently changed its mission statement to include sustainability.  Caltrans goals include both Sustainability and Stewardship. 7
  8. 8.  It is time for an innovative approach for drastically increasing the amount of crumb rubber used in California’s pavements to support these environmental related goals. 8
  9. 9.  The proposed increased use of crumb rubber in pavements is not based on the historical engineering approach of using crumb rubber to improve pavement performance, but instead is based on creating an asphalt binder which has less impacts on the environment. 9
  10. 10.  Caltrans proposal to increase the use of crumb rubber in pavements will be accomplished by a dramatic change that will require all asphalt binder used in California be “Green” asphalt. 10
  11. 11.  This “Green” asphalt proposal would require the use of 5 percent crumb rubber in all asphalt binder that is currently classified as unmodified. 11
  12. 12.  Implementation of Performance Graded Asphalt with 5 percent crumb rubber in place of unmodified asphalt binders in California would result in use of 8,300,000 to 10,000,000 tires in asphalt pavement each year. 12
  13. 13.  For Caltrans an additional 2,300,000 PTE’s could be used by requiring Performance Graded Asphalt with 5 percent crumb rubber.  With PG+5 and Asphalt Rubber Binder (Wet Process) for RHMA, Caltrans would be able to divert 6,800,000 PTEs. 13
  14. 14.  Caltrans could increase PTEs used in pavements by 51 percent which is a dramatic increase in crumb rubber usage. 14
  15. 15.  In March 2015 Caltrans met with industry stakeholders to discuss Caltrans PG+5 proposal and other industry proposed alternatives. 15
  16. 16.  March 2015 meeting alternatives: 1. Caltrans PG+5 2. Caltrans PG+5 with changes 3. Dry Process 4. Field blend 16
  17. 17.  The alternatives will be evaluated in four phases: Phase 1: Laboratory Testing Phase 2: Field Construction Evaluation Phase 3: Environmental and Life Cycle Cost Analysis Phase 4: Specification 17
  18. 18. 18
  19. 19.  This effort will follow the the Rock Products Committee process.  Draft Scoping document for Increasing Crumb Rubber Usage with Small Amounts of CRM in Hot Mix Asphalt. 19
  20. 20.  Secure needed research funding.  The total estimated research costs for this project is $635,000.  Caltrans is partnering with CalRecycle on funding the research for this project. 20
  21. 21.  Increasing Crumb Rubber Usage - Small Amounts of CRM in Hot Mix Asphalt scoping document approved on October 09, 2015.  Next step is that the Asphalt Task Group appoint Caltrans and Industry Sub Task Group Co-Chairs. 21
  22. 22.  Sub Task Group to evaluate the alternatives in terms of the following factors: 1. Technical 2. Environmental 3. Economic 4. Expected Performance 22
  23. 23. Target Timeline  Lab Testing (December 2016)  Environmental and Life Cycle Analysis (July 2017)  Pilot Projects (October 2017)  Specification (April 2018) 23
  24. 24. Contact: chuck.suszko@dot.ca.gov

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