Deformation superposition effect of asphalt mixture based on experiments and micromechanical modeling

Abstract Under multi-wheel heavy load, the asphalt mixture is prone to exhibit deformation superposition effect, which exacerbates damage of pavement structure. Multi-point penetration tests and numerical simulations by discrete element method (DEM) are performed investigate effect micromechanical characteristics mixture. The wheel spacing, group, evolution behavior analyzed. Results indicate that resistance under load decreases dramatically with decrease in spacing increase number wheels, specifically 54 mm wheels 4. DEM reflect property multi-point test. reduction tensile chains internal reason for superposition, indicating adhesive strength material. A remarkably positive correlation found between chain coefficient. In process aggregate skeleton force gradually destroyed zero until cracking. simulation outcome consistent laboratory test outcome.