AM2 3-4 Alternate Lay Pattern Evaluation
ENGINEER RESEARCH AND DEVELOPMENT CENTER VICKSBURG MS GEOTECHNICAL AND STRUCTURES LAB
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AM2 airfield matting has a long history of successful performance as an expeditionary airfield surfacing system. Logistical considerations for shipment of AM2 by the U.S. Marine Corps require equal numbers of 6-ft and 12-ft-long AM2 panels to be delivered to all project sites, resulting in far more 6-ft panels than are necessary to create a standard brickwork pattern. Therefore, the 3-4 alternate lay pattern was designed to allow Marines to use any mats on hand to fill in designated portions of the matted areas. Using the 3-4 pattern, as many as six continuous longitudinal joints are allowed, compared to only one with a brickwork pattern. A test section was constructed using the 3-4 pattern and trafficked by simulated F-15E and C-17 traffic. The test results showed a reduction in allowable passes of 92 to 96 when compared to the brickwork pattern for an installation directly over a subgrade with a California Bearing Ratio of 6. Based on these results, the 3-4 pattern is not recommended for runways or high-speed taxiways, nor for soft soil installations.
- Military Aircraft Operations
- Terminal Flight Facilities