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