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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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1
California WMA Workshop
June 26-27, 2013
2
Overview
WMA
RAP
RAS
Combinations
3
Sources 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
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Estimated WMA Production
0
5
10
15
20
25
30
35
2009 2010 2011
WM
A U
sage
(%
)
State
Other Govt.
Non-Govt.
77.9%
19.6%
2.3% 0.2%
Water-injection foaming
Chemical additive
Foaming additive
Organic additive
5
WMA in 2011 (NAPA)
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Challenges for WMA 1. Keeping track of new WMA Technologies
2. Definition of WMA
3. Developing a Mix Design Process that works for all WMA Technologies
4. Improving plant burner efficiencies
5. Lab tests that contradict field performance
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RAP usage in US (NAPA)
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RAP Usage (NAPA)
Year RAP Usage
2009 16%
2010 18%
2011 19%
Goal 25%
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Challenges for higher RAP contents
1. Determining the best way(s) to reduce cracking potential
2. Training mix designers and specifiers on use of high RAP content mixes
3. RAP handling procedures especially for higher RAP
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RAS usage in US
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RAS usage (NAPA)
RAS Usage
Year (Thousand tons)
2009 701
2010 1099
2012 1192
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Challenges for RAS
1. Determining the best way(s) to reduce cracking potential
2. Getting more states to allow RAS
3. Training mix designers and specifiers on use of RAS mixes
4. RAS handling
13
Questions ?
