Estimation of Zero Shear Viscosity Versus Rutting Resistance Parameters of Asphalt Concrete

The article presents test results of the correlation of zero shear viscosity (ηo) and the G*/sinδ parameter with rutting parameters WTSAIR and PRDAIR. The tests were conducted on asphalt concrete AC11S containing synthetic wax in the range 1.5% to 4.0% with a step of 0.5%, compacted at 115°C to 145°C with a step of 10°C. Zero Shear Viscosity was determined using the Cross/Sybilski rheological model. The results of WTSAIR and PRDAIR showed better agreement with the ηo parameter (R2> 95%) than with the G*/sinδ parameter, which reached the test convergence of R2 = 73%. The ZVS parameter exhibited a higher sensitivity to rutting resistance and stiffness results of asphalt concrete. Moreover, the increase in the amount of synthetic wax F-T used increased the rutting resistance of the asphalt mixture. Parameters ZSV and G*/sinδ did not correlate. The ZSV parameter showed higher sensitivity and correlation with the results obtained for the rutting resistance of asphalt concrete. Therefore, G*/sinδ should be used more carefully in the prediction of the resistance to rutting of asphalt mixtures with synthetic wax. The ZSV parameter should be used as a major indicator characterizing the susceptibility of asphalt mixtures rutting. This is particularly warranted when new asphalt mix modifiers are applied.