Engineer Design Test of Modified XM19Special Surfacing Landing Mat.

摘要

The standard XM19was modified by using a thicker top skin and this mat was designated XM19special surfacing. 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 1600coverages of the above loading on a subgrade strength of 4 CBR,which is 60% over the required coverages. The coefficients of friction of the mat surface of 0.62dry and 0.53wet are within the acceptable limits of 0.80and 0.40as specified by the QMR. The mats sustained the required 20passes of the load cart in the same spot over a l-in.-diam arresting cable without fracture of the top mat surface. The blast test of 300F for 5sec did not cause any detrimental effects,and the mats successfully passed laboratory tests for compressive,shear,and flexural strength. (Modified author abstract)