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|Title:||Evaluation of Harvey nonwelded aluminum landing mat|
|Authors:||Naval Air Engineering Center (U.S.)|
Burns, Cecil D.
Grau, Robert W. (Robert Walter)
Harvey Aluminum, Inc.
AM2 landing mats
|Publisher:||U.S. Army Engineer Waterways Experiment Station.|
Engineer Research and Development Center (U.S.)
Abstract: This investigation was conducted to evaluate the performance of the 1- and 2-ftuwide Harvey nonwelded aluminum landing mats and to compare the performance with that obtained in previous tests on standard AM2 mat. This landing mat was extruded by the Harvey Aluminum Co., Torrance, Calif. Three test sections were built and surfaced with different shipments or types of Harvey mat. The first and second sections were surfaced with 1- by 6-ft and 2- by 6-ft mat, respectively, each over two clay subgrade items with different CBR strength values. The third section consisted of two items surfaced with 2- by 12-ft and modified 2- by 12-ft mat over a subgrade of the same nominal strength as the lower subgrade strength of the first and second sections. All three test sections were subjected to uniform-coverage traffic, and section one was also subjected to single-line traffic. The traffic represented 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: (A.) The Harvey 1- by 6-ft, 2- by 12-ft, and modified 2- by 12-ft nonwelded aluminum mats 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 subgrades having minimum CBR's of 3.7, 4.2, and 4.4, respectively, or greater throughout the period of traffic. (B.) The Harvey 1- by 6-ft nonwelded aluminum landing mat 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 1-1/2 ft or more from the mat end joints when placed on a subgrade having a CBR of 4.6 or greater throughout the period of traffic. (C.) The two sections of 2- by 6-ft nonwelded mat failed early in the traffic period due to extrusion defects and not to the nonwelded joint configuration. (D.) The main difference between the performance of the 2- by 12-ft mat and that of the modified 2- by 12-ft mat was that the modified planks shifted more laterally duing traffic. (E.) Compared- with AM2 mats previously tested at the WES, the 1- by 6-ft mat will sustain 188 coverages of aircraft operations with a 27,000-lb single-wheel load and 400-psi tire inflation pressure on a lower subgrade strength, but the 2- by 12-ft Harvey nonwelded mat requires a slightly higher subgrade strength to sustain 188 coverages of traffic. NOTE: This file is very large. Allow your browser several minutes to download the file.
|Rights:||Approved for public release; distribution is unlimited.|
|Appears in Collections:||Miscellaneous Paper|