New Technologies Land on Airport Pavements
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Transcript of New Technologies Land on Airport Pavements
New Technologies Land on Airport Pavements
Rocky Mountain Asphalt ConferenceFebruary 18-20, 2009
AAPTP Background
• Cooperative Agreement FAA & AU• Created in 2004 $2million/year• $1.6 million for 3 year obtained• Organized similar to TRB NCHRP• 19 Projects funded• Future dependent upon New FAA
Legislation in Congress
Obstacles for Technology
• Lack of experience with technology
• Aversion to risk • Differences between airport and
highways• FAA lack of encouragement
Technologies Introduced
• PG Binder Grading (04-02)• Superpave (04-03)• SMA (04-04)• Guidelines for Rubblization (04-01)• Longitudinal Joints (04-05)
Projects of Interest
• HMA Airport Construction Best Practice Manual (05-01)
• Techniques for Mitigation of Reflective Cracking (05-04)
• Use of RAP in Airport Pavements (05-06)
Projects Underway• Life Cycle Cost Analysis For Airfield Pavements
(06-06)• Non Coal Tar Based Fuel Resistant Sealers and
Binders (05-02)• Techniques for Prevention and Remediation of
Non-load Related Distresses (05-07 & 06-01)• Effect of De-icing Chemical on HMA Airfield
Pavements (05-02)
Projects Underway (Cont.)• Non-destructive Testing to Identify Presence
and Extent of Delamination of HMA Airfield Pavements (06-04)
• Use of Recycled ASR PCC Materials in HMA (06-02)
• Guidelines for Use of State DOT Specs (06-05)• Performance Base Specs for Airfields (06-3)• Assessment of Existing Overlay Design
Procedures for Airfield Pavements (06-07)
• Change from highways to airfield• Considerations for airfield use– Gross vehicle weights– Number of loads– Speed of Loadings– Wander
• Use of pavement facility• Availability of required asphalt grade
Project 04-02 PG Binder Selection
PG Binder Selection Background
• PG System Design based upon highway traffic and expected temperatures at the pavement site
• Grades based upon same performance measurement at different temperatures
• PG 64-22 represents a binder that provides satisfactory performance at a high temperature of 64 C and at a low temperature of -22C
Binder Performance Grade:PG 52
10 16 22 28 34 40 46
Design high pavement temperature, C:
<52
Design low pavement temperature, C:
>10 >16 >22 >28 >34 >40 >46
Test on Original Binder
Flash Point Temperature (T 48), Min., C
230
Viscosity (ASTM D 4402)Maximum value of 3 Pa-s attest temperature, C
135
Dynamic Shear (TP 5)G*/sin , minimum value 1.00 kPa, at 10 rad/s and Test Temperature, C
52
Tests on Residue from Rolling Thin Film Oven (T 240)
Mass Loss, Maximum, % 1.00
Dynamic Shear (TP 5)G*/sin , minimum value 2.20 kPa, at 10 rad/s and Test Temperature, C
52
Tests on Residue from Pressure Aging Vessel (PP 1)
PAV Aging Temperature, C 90
Dynamic Shear (TP 5)G* sin , maximum value 5,000 kPa, at 10 rad/s and Test Temperature, C
25 22 19 16 13 10 7
Physical Hardening Report
Creep Stiffness (TP 1)Stiffness, maximum value 300 MPa m-value, minimum value 0.30, at 60 sec ant Test Temperature, C
0 6 12 18 24 30 36
Direct Tension (TP 5)Failure strain, minimum value 1.0%, at 1.0 mm/min and Test Temperature, C
0 6 12 18 24 30 36
LTPPBind Software
Procedure– Convert aircraft weights into Equivalent Highway
loads (EHE)– Select base temperature from LTPPBind 3.1– Adjust for traffic and pavement location on facility– Check for availability within US
PG Binder Selection
Convert Aircraft to EHE
100,000
1,000,000
10,000,000
100,000,000
1,000 10,000 100,000 1,000,000
Annual Departures
EH
Es
for
Bin
der
Gra
de
Sel
ecti
on
10,00030,000100,000
300,000
1,000,000
Maximum Gross Aircraft Weight, lb:
PG AdjustmentsAircraft Stacking
Typical SpeedMph Design Traffic
EHEs
Grade AdjustmentC
Runway Centers
Taxiways/ Runway Ends
Non-Modified Binders
Polymer Modified Binders*
None 45 15 to < 45 < 300,000 0
Little or none 45 15 to < 45
300,000 to< 3 million
+7Not Required
+4
3 million to < 10 million
+7Suggested
+4
10 million ---Required
+4
Occasional --- 5 to < 15< 10 million +14
Suggested+11
10 million ---Required
+11
Frequent --- < 5 Any ---Required
+17
*Polymer modified binders must have a minimum elastic recovery value of 60 % at 25 C, following procedures described in AASHTO 301.
Check for Availability
Common Binder PG GradesState 46 67 70 82
-28 -34 -28 -34 -28 -22 -34 -28 -22 -16 -22 -34 -28 -22 -16 -10 -16 -28 -22 -16 -28 -22 -16Alabama -- -- -- -- -- Y -- -- Y -- Y -- -- -- -- -- -- -- Y -- -- -- --Alaska -- -- -- -- Y -- -- Y -- -- -- -- -- -- -- -- -- -- -- -- -- -- --Arizona -- -- -- -- -- Y -- -- Y Y -- -- -- -- -- Y -- -- Y Y -- -- --
Arkansas -- -- -- -- -- -- -- -- Y -- -- -- -- Y -- -- -- -- Y -- -- -- --Colorado -- -- -- Y Y Y -- Y Y -- -- -- Y -- -- -- -- Y -- -- -- -- --
Connecticut -- -- -- -- Y -- -- Y Y -- -- -- -- -- -- -- -- -- -- -- -- -- --Delaware -- -- -- -- Y -- -- Y -- -- -- -- Y -- -- -- -- Y -- -- -- --Florida -- -- -- -- -- -- -- -- Y -- Y -- -- -- -- -- -- -- Y -- -- -- --Georgia -- -- -- -- -- Y -- -- Y -- Y -- -- -- -- -- -- -- Y -- -- -- --Hawaii -- -- -- -- -- -- -- -- -- Y -- -- -- -- -- -- -- -- -- -- -- -- --Idaho -- -- -- Y Y -- Y Y Y -- -- -- Y -- -- -- -- Y -- -- -- -- --Illinois Y -- Y -- Y Y -- Y Y -- -- -- Y Y -- -- -- Y Y -- -- -- --Indiana -- -- -- -- Y -- -- Y Y -- -- -- Y Y -- -- -- -- Y -- -- -- --
Iowa -- Y Y -- Y Y -- Y Y -- -- -- -- Y -- -- -- -- Y -- -- -- --Kansas -- -- -- -- -- Y -- Y Y -- -- Y Y Y -- -- -- Y Y -- Y Y --
Kentucky -- -- -- -- -- Y -- -- Y -- -- -- -- Y -- -- -- -- Y -- -- -- --Louisiana -- -- -- -- -- Y -- -- Y -- -- -- -- Y -- -- -- -- Y -- -- -- --
Maine -- -- -- Y -- -- -- Y -- -- -- -- -- -- -- -- -- -- -- -- -- -- --Maryland -- -- -- -- -- -- -- Y Y -- -- -- -- Y -- -- -- -- Y -- -- -- --
Massachusetts -- -- -- Y -- -- -- Y -- -- -- -- -- -- -- -- -- -- -- -- -- -- --Michigan -- Y Y Y Y Y Y Y Y -- -- -- Y Y -- -- -- Y Y -- -- -- --
Minnesota -- -- -- Y Y -- Y Y -- -- -- Y Y -- -- -- -- Y -- -- -- -- --Mississippi -- -- -- -- Y -- -- -- -- -- Y -- -- -- -- -- -- -- Y -- -- Y --
Missouri -- -- -- -- -- -- -- -- Y -- -- -- -- Y -- -- -- -- Y -- -- -- --Montana -- -- Y -- -- -- Y Y Y -- -- -- Y -- -- -- -- -- -- -- -- -- --Nebraska -- -- -- -- -- -- -- Y -- -- -- -- Y -- -- -- -- Y -- -- -- -- --
52 58 64 76
Questions?
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