advantages and benefits of evotherm
DESCRIPTION
Presented by Lance Brooks.TRANSCRIPT
Advantages & Benefits of Evotherm
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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
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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
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Liquid Anti-Strip Replacement & Fiber Removal
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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.
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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
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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
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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
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62 Deg Difference
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24 Deg Difference
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Extended Hauls and
Paving Season
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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.
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HMA at 50ºF
HMA has only 19
minutes of paving time
until the minimum
compaction temperature is reached.
19 Minute
s
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Evotherm at 50ºF
35 Minute
s
Evotherm has 35
minutes until the minimum compaction temperature is reached.
> 80% Increase in compaction
time
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Evotherm at 1ºF
21 Minute
s
It would have to be 1°F outside
for Evotherm to behave like HMA at 50 °F!
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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
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Increased usage of RAP
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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.
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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
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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
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Reduced Fuel Consumption and Emissions
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Lower Emissions
Hot Mix
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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
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What is WARM?
Hot MixEven at 276 °F, fumes are still
visible.
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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
↓
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Longer Binder Life
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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
*
*
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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
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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
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The Evotherm Difference
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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
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Easy to Use, Lowest Temperatures, Proven Performance