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Taxilane Reconstruction Adjacent to Active Gates at
Washington Dulles International Airport
Autor/Author: Richard G. Thuma, P.E.
XIV Seminario ALACPA de Pavimentos Aeroportuarios
XII Taller Federal Aviation Administration
VII Curso Rápido de Mantenimiento
de Pavimentos de Aeródromos
28/05 al 01/06 2018 – Ciudad de Quito - Ecuador
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Agenda
• Dulles Airfield Pavement Background
• Airfield Pavement Management Approach
• Taxilane C Reconstruction
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Washington Dulles International Airport
• Airfield Original
Construction 1960-1961
• Multiple expansions over
years
• Ownership transfer from
FAA to MWAA in 1987
• Expansion of taxiways
continued until about
2001
• Annual Evaluation/
Reconstruction Program
started in 2003
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IAD Pavement Background
• Original Pavement composed of 15-inch PCC on
9-inch Aggregate Base
• Subgrade Soil = Weathered Shale, mostly low-
plasticity clay
• Paving Lanes 25-ft wide
• Transverse Joint Spacing at 20 to 25 feet
• Pavement Monitoring Program started in 1979 to
calculate PCI (Pavement Condition Index) and
determine repair budget
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Current Pavement Management Approach
• Established in 2002 for integrating the pavement
rehabilitation construction demands with the Dulles
Development (d2) program
• Two distinct deliverables:
• Pavement Management Update: A complete PCI
inspection and update to the PMS
• Project Definition Report: Document to identify areas
that require major reconstruction or rehabilitation
projects
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Pavement Management System Updates• Inspected in accordance with
FAA Advisory Circular
150/5380-06C. “Guidelines and
Procedures for Maintenance of
Airport Pavements”
• Five Complexes
• Runway 1L-19R
• Runway 1C-19C
• Runway 1R-19L
• Midfield
• Runway 12-30
• One or two complexes
inspected per year:
• Initially: 25% Inspection Rate
• Now: 100% Inspection Rate with
Distress Mapping
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Three Inspection Areas
2008 100% Inspection Rate
2006 100% Inspection Rate
2006 25% Inspection Rate
2007 25% Inspection Rate
(Due to Reconst.)
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PCI Section Map
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PCI Section Map
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Detailed Distress Map
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Project Definition Report
• Projects developed based on:
• Pavement Condition
• Type and severity of pavement distresses
• Feasibility of extended pavement closure period
• Future Development
• Constructability
• Impacts to Airfield Operations
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Project Definition Report
• REHABILITATION
• Partial-depth patches
• Full-depth patches
• Individual Slab replacement or Full Pavement Reconstruction
vs.
• RECONSTRUCTION
• Pavement Sections with PCI below ~55 become candidates
for reconstruction
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Example Project Development
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Example Project Development
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Example Project Development
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Project Cost and Duration Summary
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Project Definition Report
• Prioritize projects
according to condition and
operational value
• Runways
• Main Taxiways
• Taxilanes
• Concept-level cost and
construction duration :
• Accelerated construction
schedules
• Complex phasing
• Nights-only work
• Projects combined to
develop prioritized project
list
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Prioritized Project List
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Project Overview
• Reconstruct Taxilane C, Middle Section• 100’ x 1950’
• Full Depth PCC Reconstruction
• Construction Budget: $5M
T/L C
B44/B42 A22/A20B62 A14A24A32 A26B40/B38B48B50
T/L D
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Taxilane C
April 2002
T/L C
T/L D
Ramp Tower
B44/B42 A22/A20 A14B62
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Taxilane C
April 2006
T/L C
T/L D
Ramp Tower
B44/B42 A22/A20 A14B62
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Taxilane C
Oct 2008
T/L C
T/L D
Ramp Tower
B44/B42 A22/A20 A14B62
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Taxilane C
Aug 2010
T/L C
T/L D
Ramp Tower
B44/B42 A22/A20 A14B62
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Taxilane C
April 2011
T/L C
T/L D
Ramp Tower
B44/B42 A22/A20 A14B62
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Taxilane C
Oct 2012
T/L C
T/L D
Ramp Tower
B44/B42 A22/A20 A14B62
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Taxilane C
Apr 2015
T/L C
T/L D
Ramp Tower
B44/B42 A22/A20 A14B62
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Project LimitsPreliminary Geometry
Approx. Reconstruction Limits
T/L C
T/L D
B44/B42 A22/A20B62 A14
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Existing Pavement Section
15” PCC
9” CTB
Anticipated Soil
Anticipated
Gabion Stone
Taxilane C Typical Removal Detail Typical
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New Pavement Section
17.5” PCC
¼” Choke Stone
6” CTB
6” Aggregate
Base Course
18.25” Aggregate
Backfill Stone
48”
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Drainage
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Phasing Discussions
A
KJ
B
A4A5
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Phase 3 – Work Area
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Phase 3 – Temporary Marking
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Phase 3 – Gate B48A320-200W Power-in Operation
Wingtip Clearance: 27-ft
Barricade Movement Required
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Airline: Avianca
Aircraft: A320
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Phase 3 – Gate B48A320-200W Push-back Operation
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Airline: Avianca
Aircraft: A320
Tug
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Phase 3 – Gate B44A380 Power-in Operation
Wingtip Overhang
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Airline: British Airways
Aircraft: A380*, B777
Wingtip
Trace
Engine Trace
(20-ft offset)
Nose Gear
Trace
Wingtip Clearance
Trace
(36-ft offset)
*Requires barricade movement after each work shift
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Phase 3 – Gate B44A380 Tug-in Operation
Wingtip Overhang
Airline: British Airways
Aircraft: A380*, B777
Wingtip
Trace
Nose Gear
Trace3
Main Gear
Clearance Trace
(15-ft offset)
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Phase 3 – Gate B44A380 Push-back Operation
Airline: British Airways
Aircraft: A380*, B777
Wingtip
Trace
Nose Gear
Trace
Main Gear
Clearance Trace
(15-ft offset)
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Phase 3 – BypassB737-800 Push-back Operation
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*Potential on-site equipment storage on
north side of construction area.
A380 Wingtip Overhang
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Construction
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Construction
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Construction
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Construction
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Construction
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Construction
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QUESTIONS?