A CASE FOR REDUCING PRODUCTION AND LAYDOWN TEMPERATURES - TODAY

Lowering production and placement temperatures for Hot Mix Asphalt (HMA) mixtures can lead to a number of construction and performance benefits, without the risk of sacrificing quality. In particular, these practices can result in reductions in emissions, asphalt binder aging, tenderness of the mix during compaction, and drain down with coarse mixes. The article outlines three best practices proven to be helpful in achieving a 10 degrees or more reduction in temperature. These include keeping drier stockpiles, using truck tarps, and increasing lift thickness. The moisture content of aggregate stockpiles affects production rate and fuel consumption. Truck tarps provide insulation, help keep temperatures warmer, and reduce cold spots that can affect compaction. Lift thickness is one of the most important factors on the amount of time available for compaction. Thicker lifts offer compactness and a slowdown in cooling, and ultimately give rollers more time to complete their work.

• Supplemental Notes:
  • July/August 2005; Page range: pp 24-25, 27, 30-31
• Corporate Authors:

  National Asphalt Pavement Association (NAPA)

  5100 Forbes Boulevard
  Lanham, Maryland  United States  20706
• Authors:
  • Prowell, B
  • West, R C
• Publication Date: 2005-7

Language

• English

Media Info

• Features: Figures; Photos; Tables;
• Pagination: 5p
• Serial:
  • HMAT: Hot Mix Asphalt Technology
  • Volume: 10
  • Issue Number: 4
  • Publisher: National Asphalt Pavement Association (NAPA)

Subject/Index Terms

• TRT Terms: Asphalt mixtures; Dryness; Temperature; Thickness; Warm mix paving mixtures
• Subject Areas: Materials; BITUMINOUS: BITUMINOUS MATERIALS AND MIXES;

Filing Info

• Accession Number: 01005262
• Record Type: Publication
• Source Agency: UC Berkeley Transportation Library
• Files: BTRIS, TRIS, ATRI
• Created Date: Oct 14 2005 8:23AM