Comparison of complex modulus and elasticity modulus of bitumen bonded materials

Abstract

The European standards for asphalt mixture testing are mainly focused on empirical parameters of asphalt mixtures. On the other hand, functional parameters (e.g. fatigue, stiffness) of asphalt mixtures describe real behavior of the material in-situ. These parameters are used for design of road construction according to the Slovak design method where the elasticity modulus is used instead of the complex modulus. The problem is that no standard for elasticity modulus measurement exists in the collection of the European standards. In this study complex modulus measurement was performed according to the European standard, and for comparison elasticity modulus measurement was also done according to the Australian standard.

Fatigue damage analysis of pavements under autonomous truck tire passes

“…Palmgren-Miner linear damage hypothesis also termed as Miner's rule has been used in calculating fatigue damage and remaining number of tire passes for a specific period of time [13]. Fatigue characteristics are more prevalent during low temperature conditions [16] hence the tensile strain obtained under a specific location of the wheel path, the resulting fatigue damage can be calculated using the derived form of Eq. ( 1) [11],…”

“…The footprint data has been taken from [12]. Since it has been proved that highest stress is exerted under the middle of tire [13] and the distribution of tire pressure under the tire is non-uniform [14][15][16], therefore, footprints for each tire configuration is shown in Figs 5 and 6.…”

Creep model to determine rut development by autonomous truck axles on pavement

“…Since asphalt is a rheological material, hence creep model can be used to determine deflection in asphalt layers with inputs such as modulus of elasticity [13]. Dynamic creep test was utilized to study permanent deformation if foamed asphalt mixtures and reported that resulting creep strains accumulations are good indicators of permanent deformations in pavements [14].…”