A quite considerable part of the Hungarian road infrastructure is in critical condition due to the steady traffic growth of heavy good vehicles and increasing frequency of extreme weather conditions. The author analyzed the most typical deterioration problems of asphalt pavements, their possible causes and the reasons of shortened service life of these pavements. The impacts of construction compact-asphalt technology’ modifications on the asphalt pavements were studied. Based on laboratory analysis of appropriate specimens, as a result of these technology modifications, changing characteristics of the asphalt pavement were revealed and more reliable data were provided for lifecycle costing and maintenance parameters used as input in the economic analysis.
Permanent deformation in the form of rutting is the most frequently occurring defect of asphalt pavements. This paper gives a short overview of bitumen performance parameters used for characterization of resistance against permanent deformation in the USA and Europe. Investigation of relationships between rheological parameters measured with dynamic shear rheometer using different test modes is presented. The test program consisted of measuring of performance parameters of paving grade, hard, polymer modified and rubber bitumen binders. They were tested in the linear viscoelastic range and beyond. Correlations between complex shear modulus, combined with phase angle, complex viscosity, stress sensitivity, and zero-shear viscosity are given. However, the correspondence of binder parameters with relevant performance parameters of asphalt mixes have to be further investigated.
Authors:Mohammad Fahad, Richard Nagy, and Peter Fuleki
Impacts of autonomous truck’s passes on pavement have been analyzed in this research. Two types of lateral positioning namely zero wander and uniform wander along with a super single wide tire and a dual tire have been analyzed with variable traffic speeds in ABQUS. The study concludes with the results in favor of usage of a super single wide tire under a uniform wander mode. The highest amount of pavement damage in terms of maximum rut depth is caused by the dual wheel assembly moving under a zero-wander mode. The magnitude of rut depth increases by a factor of two when a dual tire assembly is used instead of a wide tire assembly. At a uniform wander mode, rut depth increases by 0.2 mm for every 10 km/h decrease in traffic speed within 90 km/h to 70 km/h range.