Advantages & Benefits of Evotherm

2

Advantages of Evotherm

1. Improved Compaction

2. Liquid Anti-Strip Replacement & Fiber Removal

3. Reduced Thermal Segregation

4. Extended Hauls and Paving Season

5. Increased Usage of RAP

6. Reduced Fuel Consumption and Emissions

7. Longer Binder Life

3

Improved Compaction

4

PG76-22

T mix: 240°FT: 95°F

Texas DOT San Antonio, TX One of the

first Evotherm

demonstration projects in the US,

2008.

5

TxDOT Densities

94 93.1 92.5

909192

939495

9697

98

Evotherm HMA Control HMA Project

Densities and Bonuses using 4.6% PG76-22

Roadway Density

Lab Density5%

3.2%2.0%

Evotherm is frequently used as a

compaction aid to achieve density

bonuses

6

90

91

92

93

94

95

96

97

Base Binder PG67-22Surface

PG 76-22Surface

Evotherm

HMA

NCAT Test Track Pavement Densities

90

91

92

93

94

95

96

97

Base Binder PG67-22Surface

PG 76-22Surface

Evotherm

HMA

200

220

240

260

280

300

320

340

% D

ensi

ty

Compaction Temp (F)

Evotherm Temp

HMA Temp

7

Liquid Anti-Strip Replacement & Fiber Removal

8

Approval as a Liquid Anti-Strip

Evotherm has been approved as a liquid anti-strip

• Alabama • Florida • Illinois

• Iowa • Missouri • North Carolina

• Tennessee • Virginia • Washington• Louisiana

Enables replacement of lime or liquid anti-strip in the mix design while achieving best-in-class warm mix asphalt

performance.

9

Fiber ReplacementOGFC

Clemson University, Dr. Brad Putman

Evaluated HMA and Evotherm OGFC mixtures with and without fibers

Less Draindown

Equal or Greater Optimum Binder

Content

No Moisture Sensitivity

Lower Cost,Longer Lasting

RoadsWith Evotherm

10

Fiber ReplacementSMA

Rutgers University, Dr. Thomas Bennert

Evaluated HMA and Evotherm SMA mixtures with and without fibersLess Draindown

Higher Fatigue Resistance

Lower Mixture Stiffness

Lower Permanent Deformation Resistance

Lower Cost,Longer Lasting

RoadsWith Evotherm

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Reduced Thermal Segregation

12

Thermal Segregation

Associated with poor pavement performance.

Resists adequate compaction even after aggressive rolling

Higher permeabilities due to lower density

Lower shear strength

Increased binder oxidation

Reduced life of the road

13

62 Deg Difference

14

24 Deg Difference

15

Extended Hauls and

Paving Season

16

Reaching Farther & Working Longer

Evotherm can be used at hot mix temperatures to increase your market reach and extend your paving season

Increase market reach by hauling material longer distances. Since Evotherm remains workable at a lower temperature, asphalt can be cooler when it reaches the jobsite. This gives remote jobs extended haul times.

Extend paving seasons while achieving target densities. Even when it’s cold out, Evotherm gets the job done. Many contractors have succeeded with Evotherm below the traditional “stop paving” temperatures.

17

HMA at 50ºF

HMA has only 19

minutes of paving time

until the minimum

compaction temperature is reached.

19 Minute

s

18

Evotherm at 50ºF

35 Minute

s

Evotherm has 35

minutes until the minimum compaction temperature is reached.

> 80% Increase in compaction

time

19

Evotherm at 1ºF

21 Minute

s

It would have to be 1°F outside

for Evotherm to behave like HMA at 50 °F!

20

Modoc National ForestDecember 2010

Modoc National Forest is located in a remote section of Northern California…

…over a mountain pass

….that requires chains

….with temperatures in the 20s

….for an over 2-hour haul.

Mix type? ¾ -inch with a modified PG 62-38 binder and containing 15% RAP

VERY FAVORABLE performance compared to the hot mix section.

• No chunks after the belly dump• Mix came out of the chute “like sand”• Surpassed target densities

21

Increased usage of RAP

22

Recycled Asphalt Pavement

Evotherm can increase RAP content by over 50% vs HMA

The DOE forecasts crude oil prices to average $105 per barrel throughout 2011 and 2012.

23

Increased RAP in Missouri

Evotherm

35% RAP

HMA

20% RAP

Penetration 28 29

Viscosity 23,500 25,900

Ductility 42 38

DSR @ 64 C 7.56 7.35

MSCR 32 26

DSR @ 70 C 3.49 3.48

I-44 in Eureka, MO near St. Louis

12.5-mm Superpave mix with PG70-22 binder

Increased RAP content by 75% while maintaining mix

properties.

Excellent workability in the lab and in the field.

RAP savings of $4 per mix ton!

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Blending of RAP and Virgin Asphalt

Thorough blending of virgin and RAP binders is important, especially when high levels of RAP are used.

Evotherm mix formulations containing 40% RAP were evaluated in MWV’s Asphalt Innovations laboratory

• Dynamic moduli were measured with an AMPT and calculated using the Hirsch model protocol.

• Thorough blending of the RAP binder and virgin PG64-22 binder was observed.

• Excellent correlation between measured and calculated values was shown.

Evotherm mixtures containing 40% RAP

Dynamic Moduli, ksi

Mea

sure

d68 °F, 10 Hz

10000

1000

100

10

1

Cal

cula

ted

68 °F1 Hz

68 °F0.1 Hz

25

Maintaining the Performance GradeNew York City, New York

Evotherm and HMA were compared in mixes containing 40% RAP

HMA control binder graded as a PG 76-16 & failed PAV testing

Evotherm binder graded as a PG 70-22; Less thermal cracking

Under cold weather conditions, Evotherm in PG64-22 was evaluated with 40% RAP.

Ambient temperature below 20 °F

Tarped trucks and 30 minute haul

Mix compacted easily with dense longitudinal joints

26

Reduced Fuel Consumption and Emissions

27

Lower Emissions

Hot Mix

28

Lower Stack Emissions with Evotherm compared to HMA

200 °F Evotherm, 310°F HMA control

-90%

-80%

-70%

-60%

-50%

-40%

-30%

-20%

-10%

0%

Fuel CO2 CO SO2 Nox TPM

29

What is WARM?

Hot MixEven at 276 °F, fumes are still

visible.

30

Fume Exposure compared to HMA

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

Total Organics Benzene Solubles

HMA

Evotherm

↓41%

Evotherm Below Detectable

Limits

↓

31

Longer Binder Life

32

Binder Hardening

Virgin AC After Paving 2 Years Later

0

20

40

60

80

100

120

Pen Hot Mix

Evotherm

Reduced Oxidation

with Evotherm

33

Aggregate AbsorptionHot Mix Control

TxDOT Cores After 1 Year

34

TTI Overlay Tester Results

29 54108

41 58

841

634593

321

597

0

100

200

300

400

500

600

700

800

900

Cyc

les

to F

ailu

re

Hot Mix

Evotherm

* Test stopped

*

*

35

TTI Overlay Tester Results - Limestone

31 21 20 30 26

419

490

345 334

397

0

100

200

300

400

500

600

Cyc

les

to F

ailu

re

Hot Mix

Evotherm

36

Longer Lasting Roads

Hundreds of projects; > 10,000 miles

9+ independent studies

More than 20 DOT Evaluations

Projects in 40 states, 8 provinces, 10 countries

Approximately 20 million ESAL’s on NCAT Test Track with less than 2 mm of

rutting

37

The Evotherm Difference

38

Evotherm Difference

Easy to Use• Any mix plant • No equipment to purchase or

maintain• Drop-in laboratory evaluations

Lowest Temperatures

Proven Performance

39

Evotherm Difference

Easy to Use

Lowest Temperatures• Reduced thermal segregation• Lower emissions• Reduced fuel consumption• Long hauls• Extended season

Proven Performance

40

Evotherm Difference

Easy to Use

Lowest Temperatures

Proven Performance• Improved Compaction• Increased RAP Content• Longer binder life

41

Easy to Use, Lowest Temperatures, Proven Performance