Quantifying the Role of Coarse Aggregate Strength on Resistance to Load in HMA for Blended Aggregates

Details

• Creators:
  Abdallah, Imad ; Mahmoud, Enad ; Nazarian, Soheil ; Masad, Eyad
• Corporate Creators:
  University of Texas at El Paso. Center for Transportation Infrastructure Systems
• Corporate Contributors:
  Texas Department of Transportation. Research and Technology Implementation Office ; United States. Department of Transportation. Federal Highway Administration
• Subject/TRT Terms:
  Aggregate Gradation Asphalt Pavements Coarse Aggregates Hot Mix Asphalt Mix Design Pavement Performance Strength Of Materials
• Publication/ Report Number:
  FHWA/TX 08/0-5268-3, Report No. 0-5268-3
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  Texas. Department of Transportation
• Abstract:
  The performance of the new generation of HMA mixtures that rely more on a stone-to-stone contact is greatly influenced by the properties of the aggregate blends such as gradation and strength. As a result, aggregates have a significant and direct effect on the performance of asphalt pavements, and it is important to maximize the quality of aggregates to ensure the proper performance of roadways. The objective of this research is to evaluate the effect of stress concentrations at contact points of single-source and blended coarse aggregates. To achieve this objective, an extensive series of tests to characterize and to evaluate the performance of a number of aggregates were carried out. The laboratory activities were supplemented with micro-mechanical modeling to understand the internal behavior of the mixes. The aggregates were tested at different blends in four mixes. A number of findings were made based on the aggregate quality, the blending ratios and the type of aggregate blended. Also, the results from Phase I and Phase II were supported both in the tests that are recommended to be included as part of the aggregate characterization and in showing the gap in ranking the aggregates based on current tests. It should be emphasized that these observations are preliminary since the database is rather small. As a result, it is proposed to expand the database with more aggregate sources.
• Format:
  PDF
• Funding:
  0-5268
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:d342acc08b15a720ea76fd36880cd2c798bb0dfbddf0149de5faca0bfd4b47000ad66a95883405a99abd3eb1726144f5915b4fcefae74eaa2067eb383936002a
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/88885/dot_88885_DS1.pdf
• File Type:
  [PDF - 1.09 MB ]