As part of an on-going research program regarding the unbound pavements used for heavy construction and resource industry haul roads, an experiment was carried out at the Pavement Test Facility, Transport Research Lab, Crowthorne, England, to an experimental design set out by UNB. The experiment was arranged to determine the effects caused in unbound single-layer granular pavements by extremely heavily loaded wheels having tires with very low inflation pressures, simulating the effects of central tire inflation (CTI). The behaviour of the roads was observed at 30, 100, 300, 1000, 3000, 10000 passes, by performing straight-edge and wedge tests of rutting and by taking optical levels to measure rut development. The results of measure rut development. The results of these tests are discussed, and conclusions drawn regarding reduced tire inflation pressure and the behaviour of the model unbound granular roads. (A)
Samenvatting