Description
Accelerated load tests were performed on laboratory simulated pavement sections to evaluate the rutting potential of asphalt concrete and asphalt rubber mixture. Two pavement sections were surfaced with asphalt concrete and two others were surfaced with asphalt rubber mixture. The pavement sections were subjected to moving loads at a speed of 50 km/h using an accelerated load testing device. Two load levels were used to simulate axle loads of 67 and 89 kN. The accumulation of the rut depth was monitored through one million load repetitions. The rate of rutting of asphalt rubber mixture was less than that of the asphalt concrete for the high load level, while the opposite was true for the low load level. Rutting was mostly developed through densification of materials in the case of asphalt
concrete pavement, where it was mostly due to shoving (or lateral displacement) in the case of asphalt rubber pavement. The results of the accelerated load testing were used to develop rutting performance prediction equations for both asphalt concrete and asphalt rubber mixture pavements. The Ohio State Rutting Model was used in this analysis and produced good estimates for the rutting potentials of pavements. The rutting constants of the model
depend on the mix type and the load level.
