Evaluation of May Two-Piece AM2 Landing Mat.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
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The investigation was conducted to evaluate two-piece AM2 landing mat. The mat was fabricated from two 12-in.-wide extrusions welded together to form a 2-ft-wide plank. A test section consisting of one sand and two clay subgrade items with various CBR strength values was constructed and surfaced with the mat. The test section was subjected to uniform-coverage and single-line traffic representing operations of an aircraft having a 60,000-lb gross weight with a single-wheel main-gear assembly load of 27,000 lb with a 30-7.7 tire inflated to 400 psi. Based on the results obtained in this study, it is concluded that the May two-piece AM2 will sustain 1600 cycles 188 coverages of aircraft operations with a 27,000-lb single-wheel load and 400-psi tire-inflation pressure when placed on a subgrade having a CBR of 4.1 or greater throughout the period of traffic, the May two-piece AM2 will sustain 1600 passes of a 27,000-lb single-wheel load with a tire-inflation pressure of 400 psi in a single path located 1-12 ft or more from the mat end joints when placed on a subgrade having a CBR of 4.3 or greater throughout the period of traffic, and general behavior of the mat in these tests was not materially affected by the two-piece nature of the planks. Author
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