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|Title:||Evaluation of AM2 2-1 lay pattern over a 25 CBR subgrade|
|Authors:||Hoffman, Nolan R.|
Garcia, Lyan I.
Rushing, Timothy W.
Runways (Aeronautics)--Maintenance and repair
|Publisher:||Geotechnical and Structures Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Technical Report (Geotechnical and Structures Laboratory (U.S.)) ; no. ERDC/GSL TR-18-7|
|Abstract:||AM2 matting has a long history of successful performance as an expeditionary airfield surfacing system. Previous evaluations determined the number of passes to failure of AM2 when installed in a brickwork pattern over a wide range of soil strengths and alternate 2-1 and 3-4 lay patterns installed over soft soils. To determine the reliability of AM2 when installed in alternate patterns over stronger soils, the U.S. Air Force Civil Engineer Center (AFCEC) sponsored the evaluation of AM2 over a soil with a CBR of 25 installed in a 2-1 lay pattern. A CBR of 25 is considered by the U.S. Navy Naval Air Systems Command (NAVAIR EAF) to be the minimum threshold at which no subgrade maintenance is required during expeditionary operations. Recent investigations showed that the 2-1 configuration significantly reduces the operating life of AM2 over subgrades with a CBR of 6. In contrast, the results of the 25 CBR, 2-1 lay evaluation showed that both F-15E traffic and C-17 traffic surpassed the 1,500 pass requirement. The evaluation validated the NAVAIR EAF requirement for a minimum CBR of 25 to minimize maintenance requirements for F-15E and C-17 operations.|
|Gov't Doc #:||ERDC/GSL TR-18-7|
|Rights:||Approved for Public Release; Distribution is Unlimited|
|Size:||117 pages/29.66 Mb|
|Types of Materials:||PDF/A|
|Appears in Collections:||Technical Report|