Aggregate absorption in HMA mixtures.

Details

• Creators:
  Cooley, Jr., L. Allen ; Williams, Kevin
• Corporate Creators:
  Burns Cooley Dennis, Inc.
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Hot mix paving mixtures
  • Absorption
  • Aggregates
  • Mix design
  • Binder content
  • Specific gravity
  • Durability
  • Aging (Materials)
  • Laboratory tests
  • Field studies
  More +
• Publication/ Report Number:
  FHWA/MS-DOT-RD-13-245 ; MS-DOT-RD-13-245
• Resource Type:
  Tech Report
• Geographical Coverage:
  Mississippi
• Corporate Publisher:
  Mississippi. Dept. of Transportation
• Abstract:
  Designing hot mix asphalt (HMA) that will perform for many years is a complex balancing act of selecting an ; appropriate design asphalt binder content that is sufficiently high to provide durability but not so high as to lead ; to rutting problems. One of the factors that has to be considered during the design of HMA is the absorption of ; asphalt by aggregates. Most all aggregates used in the production of HMA have some absorptive characteristics. ; The objective of this project was to evaluate asphalt absorption through the production and construction process. ; In order to accomplish this objective, six on-going HMA construction projects were visited and HMA sampled. ; The HMA was sampled from four locations through the production and construction process, including: the slat ; conveyor prior to the mix being placed in the silo, trucks prior to transportation, the paver, and the compacted ; HMA layer (cores). Laboratory testing was conducted on these samples to evaluate the amount of asphalt that was ; absorbed by the aggregates throughout the production and construction process. ; Based upon the results of testing, it was concluded that asphalt absorption continues from the production process ; through the construction process. Sample obtained from the slat conveyor and the truck had similar average ; asphalt absorption values, while the paver and core samples also had similar average asphalt absorption values. ; However, the asphalt absorption at the paver and core locations were significantly higher than the other two. This ; suggested that most of the absorption took place during mix transportation to the job site. It was attempted to ; compare the amount of asphalt absorption that took place during mix design (based upon the job mix formula) to ; the amount of asphalt absorption that took place during the production and construction process; however, this ; attempt was not successful. Generally, the amount of asphalt absorption in the field was much higher than that ; shown on the job mix formulas.
  More +
• Format:
  PDF
• Funding:
  SS-245
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/27480/dot_27480_DS1.pdf
• File Type:
  [PDF - 1.28 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:bd7c673c4b8a2f4e0891cb01f8e3bf7e98de92310e3adace6a77bf811955ab40