Brandon Milar, P.E., Director of Technical Services for CalAPA, delivers a technical presentation on Warm Mix Asphalt standards and technology at the CalAPA Spring Asphalt Pavement Conference & Equipment Expo, April 12-13, 2017 in Ontario, Calif.

1. California Asphalt Pavement Association
2017 CalAPA Spring Pavement Conference
April 12, 2017
Ontario, CA

2. Promoting
Learning
Advocating
Networking
2

3. 3
We are ENGINEERS
We provide solutions
HOW do we make it happen!!!

4. 2013 Utah Asphalt Conference; Sandy UT - March 27-28, 2013

5.  Traffic
 Environment
 Design
 Materials
 Construction

6. TRAFFIC LOADINGS
 Mix Enhancements
 modified binders
 coarse gradations
 density
 Design Enhancements
 M&E Design

7. 7
Increased environmental
activism has led to:
• Lowering of emission
limits
• Reducing exposure to
harmful chemicals
• Increasing complaints
• Reducing new HMA
plant permits
A “Greener” Planet

8. 8
 Asphalt mix that includes a technology which
improves the production and placement of
conventional asphalt mix at significantly
lower temperatures.

9. 9
WMA for Local Agencies; CalAPA SDTC
• Energy Savings
• Lower emissions
• Reduced worker fatigue
• Increased production
efficiency
• Decreased plant wear
• Improved RAP Integration
• Longer hauls
• Reduced thermal
segregation
• Cool weather paving
• Improved compaction
• Improved smoothness
What applies to YOU?

10. Hot Mix Asphalt at 325F Warm Mix Asphalt at 275F

11. 11

12. 12
2013 Utah Asphalt Conference; Sandy UT - March 27-28, 2013

13. 13
Identify and Deploy Innovation
that:
 Shortens Project Delivery
 Enhances Roadway Safety
 Protects the Environment
WMA identified as an effective,
proven, and market ready
technology that the FHWA is
prioritizing for accelerated use
FHWA: Every Day Counts

14.  Annual NAPA Survey
 IS138 Recycled Materials andWarm-Mix Asphalt
Usage 2015
 WMA usage reported based on a production
temperature reduction of 10F to 100F.
14

16. 16

17.  2009: 83% Foam 17% Additive (17 million tonsWMA)
 2013: 87% Foam 13% Additive (106 million tonsWMA)
 2014: 85% Foam 15% Additive (114 million tonsWMA)
 2015: 72% Foam 28% Additive (120 million tonsWMA)
17

18. 18
 UCPRC
 NCATTestTrack
 ALF
Similar performance
betweenWMA and HMA!

19.  NCHRP 9-43 – Mix
Design
 NCHRP 9-53 –Water
FoamingWMA
19

20.  UCPRC RR2011-02
 Smoke and odors were
significantly reduced
during construction of
the warm-mix sections
compared to the
Control.
20

21. MIX TEMP (F) AGG MOISTURE
(%)
DTH/ton
STACK
SAVING
(%)
HMA 300 3.6 0.285 N/A
WMA-A 269 4.1 0.248 13
WMA-B 269 3.9 0.237 17
21
 Fuel Usage (MI)
• WMA proven to reduce fuel usage
• Reduction in fuel usage reduces
emissions

22.  NCHRP 09-55 RAS &WMA
 State Research
 Recycling and RAP/RAS
22

23. 23

24. 24
 Allow or Require use of
WMA
 “Approved” WMA
Technology?
 JMF Approval
 Testing Modifications?
 Acceptance Requirements
Changes?
 Temperatures
 Production
 Ambient
 Laydown

25. 25

26. 26

27. 27

28. • Increase RAP %?
• Does production temps restrict RAP utilization?
• Moisture Sensitivity
• How does the use ofWMA affect the Moisture Sensitivity of
the mix?
• CompactionTemperatures
• Does theWMA affect the mixcompaction temperatures?
• WMA Dosage Rate
• How does dosage rate affect these characteristics?

29. 29

30.  Ensure rock is adequately dry at lower
production temperatures
 How does Lime Slurry, RAP %, Aggregate
moisture, etc affect mix production
temperatures?
30

31. 31

32.  Improves mix
workability
(RAP/RAS, SMA,
OGFC, etc.)
 Contractors can
efficiently build the
high performing
pavement required
by Owners!!!

33. 33
270 250 210 190 170 150
Breakdown
Intermediate
Finish
Finish
Intermediate
Breakdown

34. WMA for Local Agencies; UAPA Lunch & Learn 05/22/2014
62 Deg Difference

35. WMA for Local Agencies; UAPA Lunch & Learn 05/22/2014
24 Deg Difference

36. 36

37. 37
Increased
compaction
time x2!!!

38. 38
Reduced
Production
temperature
50F!!!
Or longer
haul?

39. 39
 California Hwy 1
 Santa Rosa – Point Arena
 ~4000 ton 3/8” OGFC PG58-
34PM
 ~1000 ton ½” HMA–A PG64-16
 Low ambient temps
 Northern California Coast
 Low: 50°F; High 60°F
 Fog and drizzle
 Mix Produced in Santa Rosa
 4 hour haul!!!
Construction

40. 3Years Later

41.  CFLHD/NPS
 Kanab – North Rim
(Cape Royal)
 UTBWC
 Ambient
 50-60F
 StrongWinds
 2 ½ Hour Haul
42

42. 43
 1000 ton 3/4” HMA–A
 Low ambient temps
 Sierra Nevada; 7,000’ elev
 Low: 28°F; High 55°F
 Sunny & Clear
 Reduced vibratory compactive
effort (Falling Rocks!!!)
 Mix Produced inTruckee, CA
 2 hour haul

43. 44
 18,000 tons ½” ARHM
(Greenbook)
 2” lift
 Ambient (day) = ~80F
 Ambient (night) = ~55F
 Long Haul:
 1 hour - Newhall
 2 ½ hour - Gorman (4000’
el)
 Night Paving - Newhall
 County’s 1st WMA ARHM Project

44. MIX PROD SCREED BREAK INTER FINISH
CONV 325 290 280 250 200
WMA 290 250 240 190 135
MIX Avg (%) BREAK INTER FINISH
CONV 93.2 4V 4V 2V
WMA 94.1 2V 4V 2S
Rolling Pattern
Temperature

45. 46

46. 47

47. 48

48.  WMA: an Engineered Solution
 Research Ongoing
 Confirmed performance
 Refined designs
 Time for Optimization
 Improve Efficiency

49. Brandon Milar, P.E.
Director ofTechnical Services
California Asphalt Pavement Association
(916) 995-0086
bmilar@calapa.net
www.calapa.net
50