EVALUATION OF AGGREGATE SIEVING METHODS FOR HOT-MIX ASPHALTIC CONCRETE DESIGN AND PRODUCTION

During the course of Research Study 2-9-80-285 "Asphalt Concrete Mixture Design and Specification," it was desired to address two question concerning sieve analysis of hot-mix asphaltic concrete aggregates which are often raised by personnel of the Texas State Department of Highways and Public Transportation (SDHPT). These questions are as follows: (1) Would the use of wet sieving (with its associated additional effort) to replace or supplement dry sieving be justified based on the additional knowledge gained and problems alleviated, for the design and production monitoring of hot mixes? (2) Would the use of concrete sieves in place of hot-mix design and production monitoring be justified based on the additional knowledge gained and the unified use of the same sieve sizes for both concrete and hot-mix testing? In an effort to answer these questions, a minimum of 10 dry, wet and extraction sieve analyses were accomplished on 10 different produced hot-mixes for the SDHPT during te summer of 1982. In all, four hot-mixes were sampled from four weigh-batch plants, and six were sampled from four drum-dryer plants. The predominant type of hot-mix sampled was SDHPT Item 340 Type "D". Most of the aggregates, although one mixture consisted entirely of crushed gravel and another entirely of pit run iron ore. Results of this study indicated (1) that there was no general need to adopt wet sieving, and (2) that concrete sives did not offer enough extra information and economy of standardization to merit adopting their usage in place of hot-mix sieves. The results of this study and the experience of one district did, however, indicate that there may be occasions where wet sieving during the design process may be very useful in precluding a mix design that may generate excessive minus No. 200 material, thus causing trouble with staying within grading limits and design tolerances.

• Corporate Authors:

  Texas Transportation Institute

  Texas A&M University System, 1600 E Lamar Boulevard
  Arlington, TX  United States  76011

  Texas State Department of Highways & Public Transportation

  Transportation Planning Division, P.O. Box 5051
  Austin, TX  United States  78763

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590
• Authors:
  • Benson, F C
  • Ellis, T D
  • Martinez, D F
• Publication Date: 1985-8

Media Info

• Features: Figures; References; Tables;
• Pagination: 79 p.

Subject/Index Terms

• TRT Terms: Aggregates; Asphalt concrete; Dryer drum process; Evaluation; Hot mix asphalt; Mix design; Mixing plants; Monitoring; Production; Sieve analysis; Specifications
• Old TRIS Terms: Wet sieving
• Subject Areas: Construction; Geotechnology; Highways; Materials; I52: Construction of Pavements and Surfacings;

Filing Info

• Accession Number: 00453657
• Record Type: Publication
• Report/Paper Numbers: FHWA/RD-85/3+285-2, Res Rpt. 285-2
• Contract Numbers: Study 2-9-80-285
• Files: TRIS, USDOT, STATEDOT
• Created Date: May 31 1986 12:00AM