1. U.S. Army Engineer Research and Development Center’s APT Research
Haley Bell
Airfields and Pavements Branch
Geotechnical and Structures Laboratory
Vicksburg, Mississippi

2. Line-of-Communication Bridge
Full-scale LOCB section
15 in. wide and 51 ft long
Constructed over an open pit
Evaluate surface durability of bridge deck
B-52 tire loading to simulate tri-lateral bridge design code
Channelized traffic in outer wheel path
Target of 100,000 HVS-A passes

3. Line-of-Communication Bridge
Failure in deck surface with B-52 tire
Switched to dual tandem at ~36,000 passes

4. Next Generation ADR Backfill Materials
Objective: To find suitable alternatives to rapid-setting flowable fill for backfill during the airfield damage repair process. The purpose is to rapidly stabilize locally available materials in place while requiring minimal compaction equipment.
Goal: Repair solution to sustain at least 500 F-15E passes and up to 3,500 F-15E passes
Mechanical Stabilization
Chemical Stabilization

5. Foam Backfill Technology for RADR Rapid Airfield Damage Repair (RADR)
Field demonstration with troop support
Repaired simulated bomb craters using rigid polyurethane foam backfill with rapid-setting concrete caps
In-house developed prototype foam dispensing equipment
Repairs met objective of 3,500 F-15E passes
Benefits to the Warfighter:
4,500 lb of foam backfill replaced 30,000 lb of soil fill
Eliminated the need for compaction
Resulted in 50% reduction in repair times compared to legacy techniques
Repairs met RADR performance criteria

6. Other/Future APT Research
Continued Geosynthetic Research
Full-scale geocell test section
Update DOD specifications
Full-scale geogrid test section
Military truck loads
Laboratory “box” testing
Benefits of geogrids in airfield pavements
Next Generation Airfield Matting Systems
RADR – continued performance of next generation materials
Performance evaluation of cold in-place recycling
Performance of non-traditional airfield pavements with low aircraft tire pressure
Thin pavements and surface treatments
Model validation - PCASE