Experimental and Computational Investigations of High Density Asphalt Mixtures

Recent studies have shown that the air void ratio of hot mix asphalt (HMA) has a profound implication on the durability and long-term performance of asphalt pavements. It is believed that a low air void ratio could enhance the strength and durability of asphalt pavements. MnDOT HMA pavements are typically constructed with air voids close to 7% in the mat and often exceeding 10% over the longitudinal construction joints. Recent efforts in Indiana have shown that a new mix design method called Superpave 5 can be used to design mixtures at 5% air voids and to successfully compact them in the field at the same 5% air voids, a significant decrease compared to current practice. The objective of this research is to build upon the preliminary results of the recently proposed Superpave 5 method and to investigate the compaction process of HMA through a combined experimental and computational approach. The computational model will be anchored by a fluid dynamics-discrete element model, which is capable of capturing the motion of aggregates in the viscous binder. The model will be calibrated and validated by a series of experiments, which include rheological test of the binder and compaction test of the mixture. The experiments will involve typical Superpave mix designs in Minnesota and modified mix designs that follow the Superpave 5 approach. The mixtures will also include a recently developed graphite nano-platelet (GNP) reinforced asphalt mixture. The proposed research will advance our understanding of how the viscous properties of the binder and the gradation of aggregates affect the compaction process of HMA. To evaluate the performance of the different mix designs, the research will also include mechanical tests on the mixtures evaluated to further investigate the effect of air void ratio on relevant properties of HMA.


  • English


Subject/Index Terms

Filing Info

  • Accession Number: 01640075
  • Record Type: Research project
  • Source Agency: Minnesota Department of Transportation
  • Contract Numbers: 1003325 WO#20
  • Files: RiP, STATEDOT
  • Created Date: Jun 30 2017 11:24AM