Post on 18-Feb-2018
Presented to: VI ALACPA Airport Pavements Seminar & IV FAA Workshop
By: David R. Brill, P.E., Ph.D.
Date: 29 October, 2009
Federal AviationAdministrationFlexible Pavement
DesignFAARFIELD 1.3 Workshop
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Starting Screen – No Job Files Created
Click on “New Job”
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Creating/Naming a Job File
Enter Job Title
Click OK
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Copy Basic Section/Pavement Type from Samples
Click on “Samples”
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Copy Basic Section/Pavement Type from Samples
Default Basic Pavement Sections
Click on “Copy Section”
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7 Basic Starting Structures in FAARFIELD
Unbonded PCC on rigidPCConRigid
PCC Overlay on flexiblePCConFlex
New rigid on stabilized baseNew Rigid
New flexible on stabilized baseNewFlexible
HMA overlay on rigid pavementAConRigid
HMA overlay on flexible pavementAConFlex
New flexible on aggregate baseACAggregate
Pavement TypeSection Name
Be sure to select the pavement type that most correctly represents your design requirements.
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Copy a Sample Pavement SectionClick on desired pavement section.
Then click on the project where the section will be saved.
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Create a New Job Title
Enter job title
Click OK
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Create a New Job Title
Click “End Copy”
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Working With a Pavement Section
Select the job and then the section you want to analyze.
Click on “Structure”to open the file.
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Working With a Pavement Section
The selected sample pavement will appear.
Click on “Modify Structure” to modify the structure if desired.
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Modifying a Pavement Section
Click on the box for the layer material type you want to modify.
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Modifying a Pavement Section
Select the layer type you want to include in the pavement section.
(No modification for this example)
Click OK
(Cancel for this example)
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Layer Placement Restrictions
• There are restrictions on placement of certain pavement layers, e.g.:– Cannot place an overlay below a surface course.– Cannot have two aggregate base layers (P-209 on
P-209) in the structure.– Aggregate layer cannot be the surface layer.
• Some layer changes cause changes in the pavement type.– Changing the surface HMA layer to PCC will change
the pavement type to new rigid.
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Modifying a Pavement Section
Click on a property in this area to modify it.
Modify the subgrade CBR for this example.
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Modifying a Pavement Section
Enter the new value for the material property.
**Some materials will have limits on allowable values.
Click OK
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Modifying a Pavement Section
New values appear in the structure window.
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Modifying a Pavement Section
Change the P-401 HMA Surface layer thickness to 150 mm.
When done changing properties, click End Modify
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Enter Traffic Mixture
Click on “Airplane”to enter traffic mix
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Enter Traffic Mixture
Use “Clear List” to clear the existing airplanes
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Enter Traffic Mixture
For each airplane:
Click on the desired airplane group.
Then select the desired airplane from the library and click “Add”
Repeat for the complete traffic mixture.
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Traffic Mix for This Example
0.00600220.446B787-8 (Preliminary)110.001,000352.441B777-300 ER100.00800204.570B767-400 ER90.001,200124.058B757-30080.00300414.130B747-400 ER Pass.70.00400397.801B747-400B Combi60.002,00079.243B737-80050.00300562.001A380-80040.001,000365.200A340-600 std Belly30.001,000365.200A340-600 std20.0060068.400A320-1001
Annual Growth, %
Annual Departures
Gross Wt., tonnesNameNo.
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Enter Traffic MixtureCertain airplanes may appear in the list twice. This is to address the presence of wing gears and belly gears.
FAARFIELD treats these as two airplanes.
However, the weight and departures are interlocked.
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Adjusting Airplane InformationGross Taxi Weight, Annual Departures and % Annual Growth may be modified.
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Adjusting Airplane Information- Gross Weight
Enter the new weight and click OK
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Adjusting Airplane Information- Gross Weight• There are limitations on changes to airplane gross
weights.• A range is provided for each airplane which
represents reasonable weights for the airplane:– Default Weight – 40%– Default Weight + 25%
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Adjusting Airplane Information- Annual Departures
Click on “Annual Departures” to change departures for an airplane.
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Adjusting Airplane Information- Annual Departures
Enter the annual departures of the airplane and click OK.
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Annual Departures in FAARFIELD
• Annual departures has the same meaning as in the previous design procedure.
• Arrivals are ignored.• For design purposes, FAARFIELD uses the
total annual departures, multiplied by the design period in years:– e.g., 1200 annual departures × 20 years = 24,000
departures.
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Adjusting Airplane Information- % Annual Growth of Annual Departures
Click on the annual growth value to bring up the dialog box.
Enter the percent annual growth and click OK.
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Adjusting Airplane Information- % Annual Growth of Annual Departures
• Allowable range of percent annual growth is +/- 10%.
• You can create the same effect by modifying the annual departures.
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Viewing Airplane Information
Scroll over to reveal additional columns of information.
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Viewing Airplane InformationAvailable in FAARFIELD Airplane Screen:
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Viewing Airplane Information
Values in CDF and P/C ratio columns will be zero when airplanes are first entered.
Save the list when finished entering, then click the Back button.
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Performing the Pavement Design
The layer with the small arrow is the layer that will be adjusted to provide the structural design.
The location of the arrow is determined by the type of structure.
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Layers Adjusted During Design
PCC Overlay on FlexPCConFlex
PCC Overlay UnbondPCConRigid
PCC SurfaceNewRigid
P-209 SubbaseNewFlexible
P-401 AC OverlayAConRigid
P-401 AC OverlayAConFlex
P-154 SubbaseACAggregate
LAYER ADJUSTEDPAVEMENT TYPE
For new flexible sections, the arrow can be moved by double-clicking next to the desired base or subbase layer in “modify structure” mode.
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Design Life
Click on “Des. Life”to change the number of years for the design period.
When the dialog box appears, enter the desired number of years (1-50).
NOTE: The standard for FAA design is 20 years.
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Performing the Pavement Design
You are now ready to design the structure. Simply click on “Design Structure.”
The program will keep you informed about the status of the design.
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Result of the Pavement Design
The program will adjust the design layer until a CDF of 1.0 is achieved.
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Result of the Pavement Design
The program has also determined the minimum base layer requirement.
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Reviewing Airplane Data After Completing the Design
CDF and P/C ratio information is now available.
This information allows you to see which airplanes have the largest impact on the pavement design.
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Saving and Reviewing the Pavement Design Data
When finished with the design, click the “Back” button. Click “Yes” to save the data.
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Reviewing Design Information
To view a summary of the design information, click the “Notes” button.
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Reviewing Design Information
You can view the summary data or copy it to other electronic media.
Data can also be exported in XML format to allow automated entry into FAA Form 5100.
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Reviewing Design Information
FAAR FIELD - Airport Pavement De sign (V 1.302 , 3/1 1/0 9) Section N ewFlexible in Job PROJECT. Workin g d irectory is C:\Program Files\FAA\FAARFIELD\ The structure is New Fle xible. Asph alt CDF was n ot computed. Design Li fe = 20 years. A de sign for this section was comp leted on 05/04/0 9 a t 16:19:21. Pavement Structure Information by Layer , Top First
N o. Typ e Thickn ess
mm Modulus
MPa Poisson's
R atio Stren gth R,MPa
1 P-401/ P-403 HMA Surface 1 50.0 1,378.95 0.3 5 0.00 2 P-401/ P-403 St (flex) 2 63.3 2,757.90 0.3 5 0.00 3 P-2 09 Cr Ag 4 75.8 35 4.3 3 0.3 5 0.00 4 Subgrad e 0.0 82.74 0.3 5 0.00
Total thickness to the top of the subgrade = 889.2 mm Airplane Information
No. Name Gross Wt. tonnes
Annual Departures
% Annu al Growth
1 A320-100 68.400 600 0.00 2 A340 -6 00 std 3 65.200 1,00 0 0.00 3 A340 -6 00 std Belly 3 65.200 1,00 0 0.00 4 A380-800 5 62.001 300 0.00 5 B737-800 79.243 2,00 0 0.00 6 B747-400 B Combi 3 97.801 400 0.00 7 B74 7-400ER Passe nger 4 14.130 300 0.00 8 B757-300 1 24.058 1,20 0 0.00 9 B767-40 0 ER 2 04.570 800 0.00
10 B777-30 0 ER 3 52.441 1,00 0 0.00 11 B787-8 (Prelimin ary) 2 20.446 600 0.00
Additional Airplane Inform ation Subgrade CDF
No. Name CDF Co ntribution
CDF Max for Airplan e
P/C Ratio
1 A32 0-100 0.00 0.0 0 1.21 2 A340-600 std 0.04 0.0 5 0.59 3 A340-600 std Bel ly 0.00 0.0 3 0.58 4 A38 0-800 0.01 0.0 1 0.41 5 B73 7-800 0.00 0.0 0 1.22 6 B74 7-400B Combi 0.01 0.0 1 0.57 7 B747-40 0ER Passeng er 0.01 0.0 2 0.57 8 B75 7-300 0.00 0.0 0 0.73 9 B767-400 ER 0.04 0.0 5 0.60
1 0 B777-300 ER 0.86 0.8 6 0.40 1 1 B787-8 (Prel iminary) 0.03 0.0 3 0.57
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Reviewing Design Information
Notice the statement “asphalt CDF was not computed.”
This means the design assumed the failure was in the subgrade and did not calculate the fatigue in the bottom of the HMA layer.
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Computing Fatigue in the HMA Layer
The user can access the optional program features including the HMA layer CDF by clicking on the Options button from the starting screen, or by pressing ALT-O from anywhere in the program.
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Computing Fatigue in the HMA Layer
To compute the HMA fatigue, uncheck the “No HMA CDF” box and re-run the design.
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Computing Fatigue in the HMA Layer
As this example demonstrates, the controlling feature is almost always the subgrade.
(i.e., the subgrade CDF has reached 1.0 (failure) while the HMA CDF is still 0.0.)
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Minimum Base Course Requirements
• FAARFIELD will automatically determine the minimum base layer requirements.
• Users can do this step manually if desired by deselecting this option.– Remove subbase layer and increase subgrade CBR
to 20.– Re-run the design to obtain the minimum base
thickness.
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Determine Minimum Base Thickness
Click on “Modify Structure”
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Determine Minimum Base Thickness
Click on “Add/Delete Layer”
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Determine Minimum Base Thickness
Click on the subbase layer.
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Determine Minimum Base Thickness
Check the Delete option.
Then click OK.
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Determine Minimum Base Thickness
Change the P-401 base layer to P-209
Increase the subgrade CBR to 20
Then click “End Modify”
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Determine Minimum Base Thickness
Click “Design Structure”
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Determine Minimum Base Thickness
The minimum P-209 base thickness is that necessary to protect the CBR 20 subbase material.
Now, convert P-209 to stabilized material.
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Determine Minimum Base Thickness
• Convert 421.3 mm of P-209 to stabilized base.• For this example, use P-401 as stabilized
material. Convert to P-401 by dividing the layer thickness by 1.6 as provided in AC 150/5320-6E, 314(d).– TP401Base = TP209 / 1.6– TP401Base = 421.3 mm / 1.6 = 263 mm (say 270 mm)
• Program performs this calculation automatically when automatic base design is enabled.
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Final Thickness Design•Reconstruct the original pavement section.
•Stabilized P-401 base at 270 mm
•P-209 as the improved subbase material (design layer).
•CBR returned to design value.
Click “End Modify”
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Final Thickness DesignPress ALT-O to bring up the Options window.
Uncheck “Enable Automatic Base Design)
Click OK
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Final Thickness Design
Then click “Design Structure”
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Final Thickness Design
The final layer thickness requirements are now visible.
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Software Available at:
• http://www.faa.gov/airports_airtraffic/airports/construction/design_software/
• http://www.airporttech.tc.faa.gov/naptf/download/index1.asp
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Thank You
Questions?