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EXPEDIENT REPAIR OF ANDREWS AFBRUNWAY 01L/19R
Air Force Research Laboratory
Air Base Technology Branch
AFRL/MLQC
Tyndall AFB FL
Randall W. Brown, PhD, PEPrincipal Engineer
Airfields &Pavements Group
OVERVIEW
• Background
• Findings/Solutions
• Repair Process
• Summary
• Conclusions
EXPEDIENT REPAIR OF ANDREWS AFBRUNWAY 01L/19R
Background
BACKGROUND
KEY EVENTS:• 2 FEB 99 AFRL/MLQC contacted by HQ AMC on
behalf of 89 CES, Andrews AFB MD
• 10-13 MAR 99 Ground Penetrating Radar (GPR) Investigation
• 13-15 APR 99 Follow-on GPR Investigation
Cone Penetrometer Testing (CPT)
Video inspection of airfield culvert
• 9-20 AUG 99 Repair of “Dip” in Runway 01L/19R at
Andrews AFB MD
PROBLEM:A 2” dip in Andrews’ runway 1L/19R (The Air Force One Runway) was causing operational problems, particularly for small aircraft.
BACKGROUND
BACKGROUND
APPROACH:
Identify the Source of the Problem Using: A) Ground Penetrating Radar B) Cone Penetration Testing C) Optical Scan of Drainage Culvert
(1)
Develop a Suite of Alternative Solutions Considering Cost, Runway Downtime, and Effectiveness
(2)
EXPEDIENT REPAIR OF ANDREWS AFBRUNWAY 01L/19R
Findings/Solutions
FINDINGS/SOLUTIONS
FINDINGS:
Water Infiltration
Poor Backfill Material
Leaking Underlying Culvert
Loss of Fines Through Culvert
Weakened Pavement Support
Settlement
FINDINGS/SOLUTIONS
ALTERNATIVES:
SOLUTION SELECTED - FOAM JACKING:
Reconstruction(1)Foam Jacking (By-product of FY 98 AFRL research)(2)
“Do Nothing”(3)
Reduced Downtime (Conservatively 50%)(1)
Reduced Cost (Conservatively 50%)(2)
Effective Based on Private Sector and AFRL/MLQC Data(3)
FINDINGS/SOLUTIONSKEY ELEMENTS
• Initial Slab Lifting Using Polyurethane Foam• Deep Injection Stabilization (Compaction Grouting with Polyurethane Foam)• Repair Leaking Culvert• Final Slab Alignment Using Polyurethane Foam• Route and Seal Joints
EXPEDIENT REPAIR OF ANDREWS AFBRUNWAY 01L/19R
Repair Process
REPAIR PROCESSPRE-TREATMENT CONE TESTING
REPAIR PROCESSPRE-TREATMENT CONE TESTING
REPAIR PROCESSDRILLING INJECTION HOLES
REPAIR PROCESSSEVERITY OF THE RUNWAY “DIP”
REPAIR PROCESSPREPARATION FOR INITIAL
LIFTING OF RUNWAY SURFACE
REPAIR PROCESSINITIAL INJECTION
REPAIR PROCESSPREPARATION FOR DEEP
INJECTION
REPAIR PROCESSSOIL STABILIZATION THROUGH
DEEP INJECTION
REPAIR PROCESSEXTRACTION OF COPPER TUBES
REPAIR PROCESSFINAL ALIGNMENT
EXPEDIENT REPAIR OF ANDREWS AFBRUNWAY 01L/19R
Summary
SUMMARY
• 106• 19,172 lbs• 2,500 lbs• 282.00 hrs - 22.25 hrs 259.75 hrs• 126.50 hrs
• Fri 20 Aug 99, 2400 required completion• Fri 20 Aug 99, 1030 actual completion
holes injecteddeep injection foamslab lifting foamgross time availabletime lost due to ramp freezesnet time availableactual time working on airfield
EXPEDIENT REPAIR OF ANDREWS AFBRUNWAY 01L/19R
Conclusions
CONCLUSIONS
Estimated Savings (50%)
Estimated Downtime Savings (60%)• 12 days -- actual repair time using foam• 30 days -- optimistic estimate for reconstruction
CONCLUSIONKEEP HER FLYING!
EXPEDIENT REPAIR OF ANDREWS AFBRUNWAY 01L/19R
Air Force Research Laboratory
Air Base Technology Branch
AFRL/MLQC
Tyndall AFB FL
Randall W. Brown, PhD, PEPrincipal Engineer
Airfields &Pavements Group