Feasibility of Quantifying the Role of Coarse Aggregate Strength on Resistance to Load in HMA

Details

• Creators:
  Alvarado, Cesar ; Mahmoud, Enad ; Abdallah, Imad ; Masad, Eyad ; Nazarian, Soheil ; Langford, Richard ; Tandon, Vivek ; Button, Joe
• 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 Bituminous Pavements Coarse Aggregates Hot Mix Asphalt Mix Design Pavement Performance Strength Of Materials
• Publication/ Report Number:
  FHWA/TX-06/0-5268-1, Research Report 0-5268-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  United States
• Corporate Publisher:
  Texas. Department of Transportation
• Abstract:
  The ever-increasing traffic volumes, including increased truck traffic and higher tire pressures, are putting greater stresses on the bituminous pavements which manifest in the form of pavement distresses such as rutting and fatigue cracking. To address these issues, improvements in the hot mix bituminous (HMA) blends are being implemented. The new generation of bituminous pavements such as coarse-graded Superpave mixtures, Stone Matrix Bituminous (SMA) and Porous Friction Course (PFC) rely more on stone-on-stone contact for a stronger coarse aggregate skeleton. The performance of HMA mixtures is greatly influenced by the properties of the aggregate blends such as gradation and strength; therefore, they have a significant and direct effect on the performance of bituminous pavements. It is important to maximize the quality of aggregates to ensure a proper performance of roadways. Several methods are available to determine aggregate characteristics, but their relationship to field performance, aggregate structure in HMA, and traffic loading needs to be further investigated and defined. Current laboratory protocols do not correlate well with aggregate abrasion, toughness, and strength requirements during handling, construction, and service. Specifications should ensure that aggregate particles possess the necessary strengths to avoid degradation during handling, construction, and traffic loading. In this report, the feasibility of determining the characteristics of the aggregates in multifaceted ways, considering the geological, geotechnical and mix design, is reported. The use of these parameters in a micro-mechanical model to predict the performance is also discussed.
• Format:
  PDF
• Funding:
  0-5268
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:c18bda7d2d01d819b1313ff3db7b21221f6cc5103d571d7ce8e1630d1d1df280b22915e50e008f6ad9e3c4e2962abbb2ce64b4b935677ba385cb2d5ef35499ce
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/88880/dot_88880_DS1.pdf
• File Type:
  [PDF - 6.00 MB ]