Field studies in New Mexico indicate that trucks are presently operating with tire inflation pressures that average approximately 105 psi with approximately 25% operating at 115 psi. Modifications to the VESYS-3A computer program were made to accept higher wheel load and tire pressures. The program was then used to predict rut depths produced by aircraft loads with wheel loads of approximately 30 kips and inflation pressures of up to approximately 355 psi. While computer code modifications were successful, it does not appear that the codes can be used directly for rut predictions for aircraft, since these modifications are not widely available. Furthermore, additional issues important with regard to aircraft wheel configurations and loads were not investigated. Part of the study does suggest, however, that back calculations based on rut measurements may produce the information to estimate materials characteristics necessary for routine use of the program. Modified Shell creep models were considered as an alternate for determining materials characteristics which would to predict rut damage due to new higher pressure truck tires. Shear models are suggested as possible methods to provide insight to rutting due to higher tire pressures and to design mixtures capable of supporting these loads.
Investigation of Mathematical Models for Asphalt Pavement Rutting
1989
152 pages
Report
Keine Angabe
Englisch
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