Study on Influence of Mineral Aggregate Gradations and Spatial Distribution on Performance of Asphalt Mixture
In order to find out the influence of geometric characteristics, distribution and combination condition of mineral aggregates on mixture properties, the single and multi aggregates were built using finite element method and the mechanical properties of aggregates was discussed. Then comparison analysis was carried out for three representative asphalt mixture structures with different gradations. Finally the optimal gradation curve was obtained. Simulation results are as follows: extreme values or damage of stress was likely to emergence on the interface between mortar and aggregate; the impact on the equivalent stress of aggregate space in vertical direction is greater than in horizontal direction; in comparison with "framework-pore" structure, the "suspend-dense" structure and "framework-dense" structure had better shear resistance behavior and load-carrying capacity. The results shows that the macroscopical carrying capacity of asphalt mixtures was determined by the microcosmical mechanical properties of aggregates, and it was a new mehtod for researching mechanical behavior owing to internal nonuniformity of asphalt mixture in future.
T. Li "Study on Influence of Mineral Aggregate Gradations and Spatial Distribution on Performance of Asphalt Mixture", Advanced Materials Research, Vol. 586, pp. 191-198, 2012