#5 status of implementation

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Warm Mix Asphalt training documents provided by the National Center for Asphalt Technology (NCAT) for classes held June 26 & 27, 2013 in California, sponsored by the California Asphalt Pavement Association (CalAPA).

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#5 status of implementation

  1. 1. 1California WMA WorkshopJune 26-27, 2013
  2. 2. 2OverviewWMARAPRASCombinations
  3. 3. 3Sources of Info for WMA NAPA Survey for WMA, RAP, RAS for years 2009,2010, and 2011 NAPA: WMA Best Practices Manual First and Second International Conference on WMA NCAT website: ncat.us warmmixasphalt.com WMA producers
  4. 4. 4Estimated WMA Production051015202530352009 2010 2011WMAUsage(%)StateOther Govt.Non-Govt.77.9%19.6%2.3% 0.2%Water-injection foamingChemical additiveFoaming additiveOrganic additive
  5. 5. 5WMA in 2011 (NAPA)
  6. 6. 6Challenges for WMA1. Keeping track of new WMA Technologies2. Definition of WMA3. Developing a Mix Design Process thatworks for all WMA Technologies4. Improving plant burner efficiencies5. Lab tests that contradict fieldperformance
  7. 7. 7RAP usage in US (NAPA)
  8. 8. 8RAP Usage (NAPA)Year RAP Usage2009 16%2010 18%2011 19%Goal 25%
  9. 9. 9Challenges for higher RAP contents1. Determining the best way(s) to reducecracking potential2. Training mix designers and specifiers onuse of high RAP content mixes3. RAP handling procedures especially forhigher RAP
  10. 10. 10RAS usage in US
  11. 11. 11RAS usage (NAPA)RAS UsageYear (Thousand tons)2009 7012010 10992012 1192
  12. 12. 12Challenges for RAS1. Determining the best way(s) to reducecracking potential2. Getting more states to allow RAS3. Training mix designers and specifiers onuse of RAS mixes4. RAS handling
  13. 13. 13Questions ?

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