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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?