acc technology showcase november 10, 2015 … fr acc technology showcase.pdfacc technology showcase...
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ACC Technology ShowcaseNovember 10, 2015Newport Beach, CA
Ronald CorunAxeon Specialty Products LLC
Director - Asphalt Technical Services
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Background
Airfield pavements experience fuel and hydraulic oil spills on aprons and taxiways Fueling operations
Aircraft sitting in queues
Softens (weakens) asphalt
Causes permanent deformations and failures
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Fuel Resistant Pavement
Sealers Coal tar sealers are most
commonly used to protect Hot Mix Asphalt pavements from fuel damage
Different coefficient of expansion for coal tar causes substantial alligator cracking within 2-3 years
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Fuel Resistant Pavement
Sealers
Coal tar sealers are carcinogenic MSDS – “Unusual Chronic
Toxicity: May cause cancer of the skin, lungs, kidney and bladder.”
Adding carcinogenic material to pavement that may be recycled – future exposure
Coal Tar sealers are outlawed in California
Similar legislation pending in other states
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Development of StellarFlex FR
Kuala Lumpur Airport specified jet fuel resistant asphalt pavements for new construction in 1995
Objective – add fuel resistance to polymer modified asphalt without sacrificing performance
No Coal Tar
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Development of StellarFlex FR
Specifications required
compacted mix samples
to be immersed in jet
fuel for 24 hours.
Average weight loss of 4
Marshall specimens
must be less than 2.0%
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Development of StellarFlex FR
Standard Hot Mix Asphalt
mixture loses 10% weight
from 24 hour soak in jet
fuel
Standard Polymer
Modified Asphalt (PG 76-
22) loses 4.5% weight
after 24 soak in jet fuel
Fuel Resistant PMA –
≈1.0% weight loss
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Asphalt Pavement Analyzer
(APA) - Rutting Evaluation of
HMA
- Moving wheel load (100 lbs.) applied to
a pressurized hose (100 psi) which lies
on top of asphalt samples
- Tested at 64oC for 8,000 loading
cycles
- Computer data acquisition system
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StellarFlex FR – Rut Resistance
0
2
4
6
8
10
12
PG 64-22 PG 76-22 PG 82-22 StellarFlexFR
10.2
6.8
4.3
1.6
APA Rutting, mm
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StellarFlex FR Fatigue Test
Flexural Beam Fatigue
Device, AASHTO T-321
Tests mix’s ability to
withstand repeated
bending which causes
fatigue failure
Data = number of
loading cycles to failure
(loss of stiffness)
Failure occurs when
stiffness of beam < 50%
of initial stiffness
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StellarFlex FR – Crack
Resistance
0
5000
10000
15000
20000
25000
30000
35000
40000
45000
PG 82-22 StellarFlex FR
4200
45000
Flexural Beam Fatigue, Cycles to Failure
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First Fuel-Resistant PMA Usage -
Kuala Lumpur International
Airport
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StellarFlex FR Usage
Fuel-Resistant PMA
Technology Brought to
US Market in 2002
First Construction
Project in US – La
Guardia Airport
Test section on taxiway –
450 tons
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Fuel Resistant Mix
Specification Developed generic
specification for fuel resistant HMA
Minimum PG 82-22 polymer modified asphalt
○ Minimum 85% Elastic Recovery
Standard test method for fuel resistance
½” P-401 mix
○ 50 blow Marshall design
○ Design at 2.5% air voids
○ Pass fuel resistance test
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StellarFlex FR Usage – Logan
Airport
Placed 1300 tons
of fuel resistant
mix on Taxiway N
and Runway 4L-
22R at Logan
Airport in June
2004
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Fuel-Resistant Usage – Logan
Airport
FR Asphalt graded
as PG 94-22
1/2” P-401 mix
designed at 2.5% air
voids
7% asphalt content
design target
APA testing at WPI
showed 0.70mm
rutting on this mix
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Logan Airport - 2014
10 year old FR Pavement
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Logan Airport - 2014
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Logan Airport - 2014
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Logan Airport - 2014
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Logan Airport - 2014
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Logan Airport - 2014
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Logan Airport - 2014
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Logan Airport - 2014
De-icing at Logan Airport is done at the gates
Alleyway P-601 pavement in picture has been exposed to de-icing chemicals for 9 winters – no visible damage to date
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P-601 Project – Williston, FL Airport
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P-601 Project – Williston, FL Airport
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P-601 Project – Williston, FL Airport
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P-601 for Bus Lanes
Bus lanes have heavy,
channelized traffic –
rutting may be an
issue
Oil and fuel leaks are
also present
Logan Airport has
used P-601 pavement
in bus lanes to solve
the problem
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FAA P-601 Specification
FAA issued
advisory Circular #
150 / 5370-10G ,
dated 07/21/2014
Contains
specification item
P-601 Fuel
Resistant Hot Mix
Asphalt (HMA)
pavement
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StellarFlex FR Summary
Polymer-Modified Asphalt
developed specifically to
resist jet fuel damage
Designed to meet FAA P-
601 Specification
Eliminate need for coal-
tar sealers
Polymer modification
provides excellent
resistance to permanent
deformation and cracking
in addition to fuel
resistance
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Questions?