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www.dot.state.pa.us PAPA Regional Technical Meetings Warm Mix Asphalt (WMA) Implementation Steven L. Koser, P.E. Chief, Roadway Management March 14-16, 2016
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Page 1: Warm Mix Asphalt (WMA) Implementation › assets › _control › content › files › 4...Warm Mix Asphalt (WMA) Job‐Mix Formula Composition Tolerance Requirements of the Completed

www.dot.state.pa.us

PAPA Regional Technical Meetings

Warm Mix Asphalt (WMA) Implementation

Steven L. Koser, P.E.Chief, Roadway Management

March 14-16, 2016

Page 2: Warm Mix Asphalt (WMA) Implementation › assets › _control › content › files › 4...Warm Mix Asphalt (WMA) Job‐Mix Formula Composition Tolerance Requirements of the Completed

www.dot.state.pa.us

Warm Mix Asphalt (WMA)

• What is WMA?

Page 3: Warm Mix Asphalt (WMA) Implementation › assets › _control › content › files › 4...Warm Mix Asphalt (WMA) Job‐Mix Formula Composition Tolerance Requirements of the Completed
Page 4: Warm Mix Asphalt (WMA) Implementation › assets › _control › content › files › 4...Warm Mix Asphalt (WMA) Job‐Mix Formula Composition Tolerance Requirements of the Completed

www.dot.state.pa.us

Warm Mix Asphalt (WMA)

Job‐Mix FormulaComposition Tolerance Requirements of the Completed Mix

Temperature of Mixture (F)

HMA WMA

Class of Material Minimum Maximum Minimum Maximum

PG 58‐28 260 310 215 310

PG 64‐22 265 320 229 320

PG 76‐22 285 330 240 330

From Pub. 408, Section 409 (HMA) and 411 (WMA)

Page 5: Warm Mix Asphalt (WMA) Implementation › assets › _control › content › files › 4...Warm Mix Asphalt (WMA) Job‐Mix Formula Composition Tolerance Requirements of the Completed

www.dot.state.pa.us

Warm Mix Asphalt (WMA)

Page 6: Warm Mix Asphalt (WMA) Implementation › assets › _control › content › files › 4...Warm Mix Asphalt (WMA) Job‐Mix Formula Composition Tolerance Requirements of the Completed

www.dot.state.pa.us

Warm Mix Asphalt (WMA)

• How do we get to 100% WMA?

• District Plans

• Potential Issues

Page 7: Warm Mix Asphalt (WMA) Implementation › assets › _control › content › files › 4...Warm Mix Asphalt (WMA) Job‐Mix Formula Composition Tolerance Requirements of the Completed

www.dot.state.pa.us

WMA Usage – Nationwide

• Nationwide use of WMA• Based on 2014 NAPA

Industry Survey

Page 8: Warm Mix Asphalt (WMA) Implementation › assets › _control › content › files › 4...Warm Mix Asphalt (WMA) Job‐Mix Formula Composition Tolerance Requirements of the Completed

www.dot.state.pa.us

WMA Usage – Nationwide

Page 9: Warm Mix Asphalt (WMA) Implementation › assets › _control › content › files › 4...Warm Mix Asphalt (WMA) Job‐Mix Formula Composition Tolerance Requirements of the Completed

www.dot.state.pa.us

WMA Usage - PA

Source:

Asphalt Producers Sampled in 2015• Asphalt Producers sampled either with HMA or

WMA = 123 (125 in 2014)• Asphalt Producers sampled with WMA = 86 (63 in

2014)• Percent of Total Asphalt Producers sampled with

WMA = 86/123 = 69.9% (50.4% in 2014)

Page 10: Warm Mix Asphalt (WMA) Implementation › assets › _control › content › files › 4...Warm Mix Asphalt (WMA) Job‐Mix Formula Composition Tolerance Requirements of the Completed

www.dot.state.pa.us

WMA Usage - PA

156,301 265,127656,732

1,931,5811,503,804

2,430,863

3,427,285

0

500,000

1,000,000

1,500,000

2,000,000

2,500,000

3,000,000

3,500,000

4,000,000

2009 2010 2011 2012 2013 2014 2015

WMA Usage 2009‐2015 (TONS)

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www.dot.state.pa.us

WMA Usage - PA

0

100000

200000

300000

400000

500000

600000

700000

800000

1‐0 2‐0 3‐0 4‐0 5‐0 6‐0 8‐0 9‐0 10‐0 11‐0 12‐0

Tons of W

MA

District

Increase Use of Warm Mix Asphalt

2013 2014 2015 2016*

*Projections

Page 12: Warm Mix Asphalt (WMA) Implementation › assets › _control › content › files › 4...Warm Mix Asphalt (WMA) Job‐Mix Formula Composition Tolerance Requirements of the Completed

www.dot.state.pa.us

Focus Areas: HMA vs. WMA Standard Const.Individual Core Density

Wearing Course Density Data from eCAMMS.

0%

5%

10%

15%

20%

25%

30%

Nor

mal

ized

% o

f To

tal

% Density of Individual Cores - Wearing

2015 Statewide % of HMA & WMA Cores with X% Density [Std. Lots (409A)]

HMAWMA

Meets Specifications

Page 13: Warm Mix Asphalt (WMA) Implementation › assets › _control › content › files › 4...Warm Mix Asphalt (WMA) Job‐Mix Formula Composition Tolerance Requirements of the Completed

www.dot.state.pa.usWearing Course Density Data from eCAMMS.

Focus Areas: HMA vs. WMA RPS Const.Individual Core Density

0%

5%

10%

15%

20%

25%

30%

Nor

mal

ized

% o

f To

tal

% Density of Individual Cores - Wearing

2015 Statewide % of HMA & WMA Cores with X% Density [RPS Lots (409B)]

HMAWMA

Meets Specifications

Page 14: Warm Mix Asphalt (WMA) Implementation › assets › _control › content › files › 4...Warm Mix Asphalt (WMA) Job‐Mix Formula Composition Tolerance Requirements of the Completed

www.dot.state.pa.us

Warm Mix Asphalt (WMA)

Questions?


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