Please use this identifier to cite or link to this item:
|Title:||Engineer design test of modified XM19 special surfacing landing mat|
|Authors:||United States. Army Materiel Command.|
Carr, Gordon L.
XM19 landing mat
|Publisher:||Soils and Pavements Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
Abstract: During previous evaluations of the standard XM19 medium-duty mat, results indicated the mat would not meet the hook-impact or the cable roll-over requirements stipulated in the QMR. Inasmuch as the QMR allows a special surfacing in the cable roll-over and hook-impact areas, the standard XM19 was modified by using a thicker top skin and this mat was designated XM19 special surfacing. In conjunction with the top skin modification, the overlap and underlap edge members were changed to connectors capable of being waterproof. The mat was traffic tested with the medium-duty loading consisting of a 25,000-lb single-wheel load (SWL) on a tire inflated to 250-psi pressure. The mat supported in excess of 1600 coverages of the above loading on a subgrade strength of 4 CBR, which is 60 percent over the required coverages. The coefficients of friction of the mat surface of 0.62 dry and 0.53 wet are within the acceptable limits of 0.80 and 0.40 as specified by the QMR. The mats sustained the required 20 passes of the load cart in the same spot over a 1-in.-diam arresting cable without fracture of the top mat surface. The blast test of 300 °F for 5 sec did not cause any detrimental effects and the mats successfully passed laboratory tests for compressive, shear, and flexural strength. The hook-impact test, consisting of two impacts on the same spot without fracture of the mat surface, was also successfully passed. The placing rate of over 500 sq ft per man-hour was in excess of the QMR requirement of 250 sq ft per man-hour essential and 400 sq ft per man-hour desired.
|Rights:||Approved for public release; distribution is unlimited.|
|Appears in Collections:||Miscellaneous Paper|
Files in This Item:
|MP-S-74-12.pdf||22.38 MB||Adobe PDF|