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Title: Engineering tests of Harvey 1-by-6-ft landing mat with integral end connectors
Authors: United States. Army Materiel Command.
McCormick, Charles T.
Keywords: Aluminum alloys
Landing mats
Harvey Aluminum, Inc.
Publisher: U.S. Army Engineer Waterways Experiment Station.
Engineer Research and Development Center (U.S.)
Description: Miscellaneous Paper
Abstract: This report describes an investigation conducted to evaluate an extruded aluminum alloy landing mat fabricated by Harvey Aluminum, Inc., Torrance, California. The J. by 6-ft mat is a one-piece hollow extrusion fabricated from 6061 aluminum alloy artificially aged to the T6 condition. The main feature of the mat was the incorporation of a nonwelded end joint, which was an integral part of each panel. Individual panels were joined together at the end joints by H-shaped extruded aluminum locking bars. This investigation consisted of traffic tests to obtain information for use in comparing the performance of the experimental mat with project requirements, and to determine the feasibility of fabricating mat with this type of end connector. A test section consisting of a heavy clay subgrade (rated CBR of 3.6) surfaced with the Harvey mat was trafficked with a rolling wheel load simulating actual aircraft operations. The tests were conducted using a load cart with a single-wheel load of 25,000 lb and a tire inflation pressure of 250 psi. The test section failed after eight coverages due to the tire hazard caused by end-joint curling. Since there was no other apparent damage to the mat, it was decided to modify the mat and continue traffic. All panels in the traffic lane were removed, and the corners formed by a female connector and an end joint were cut off. The panels were relaid in their original location and traffic was continued. The section was considered failed after 100 coverages due to severe curling and dishing along end joints and female connectors. Strength evaluation of the mat indicated that the mat, as fabricated, would support 12 coverages of the 25,000-lb single-wheel load if placed on a subgrade with a rated CBR of 4.0. Evaluation of the mat after modifying the end joints indicated that the modified mat was capable of supporting about 140 coverages of the 25,000-lb load. Therefore, neither the mat as fabricated nor the modified mat would meet the service life criterion of 200 coverages. NOTE: This file is large. Allow your browser several minutes to download the file.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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