A NEW PROCESS AND APPARATUS FOR MAKING ASPHALT CONCRETE

The new Energy Efficient Mixer (EEM) makes possible a pollution-free and energy-efficient process. The EEM can heat and mix materials to a final temperature ranging from 60ousC to more than 204ousC (140ousF to 400ousF). There are three main components associated with the complete plant: a gas- or oil-fired thermal liquid heater (heater), a sealed and indirectly heated mixing chamber (processor), and the condensing coil-heat recovery bins (heat recovery). Compared with current processes for making asphalt concrete, the pollution-free EEM uses 20 to 30 percent less fuel per ton of product. This fuel economy is based on production of 140ousC (280ousF) mixture while removing 5 percent moisture. When the moisture content of the raw material exceeds 5 percent, the EEM process becomes even more efficient compared with existing processes. EEM thermal efficiency is made possible by effective recovery of the heat of vaporization contained in the removed moisture. In addition to cleanly and efficiently producing all types of asphalt concrete, EEM can produce new mixtures with a predetermined optimum moisture content. This optimized asphalt concrete mixture is produced by controlling the mixture temperature and the vapor pressure within the sealed mixing chamber. Furthermore, oxidation of the mixture is minimized because the heating and mixing take place within a sealed and pressurized chamber.

• Record URL:
  • http://onlinepubs.trb.org/Onlinepubs/trr/1984/986/986-005.pdf
• Summary URL:
  • https://scholar.google.com/scholar_lookup?title=A+NEW+PROCESS+AND+APPARATUS+FOR+MAKING+ASPHALT+CONCRETE&author=P.+Bracegirdle&publication_year=1984
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0309037700
• Supplemental Notes:
  • Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved. Publication of this paper sponsored by Committee on Construction Equipment.
• Authors:
  • Bracegirdle, Paul E
• Conference:
  • 63rd Annual Meeting of the Transportation Research Board
  • Location: Washington District of Columbia, United States
  • Date: 1984-1-16 to 1984-1-20
• Publication Date: 1984

Media Info

• Media Type: Print
• Features: Figures;
• Pagination: pp 22-26
• Monograph Title: Construction: quality control and specifications
• Serial:
  • Transportation Research Record
  • Issue Number: 986
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Aggregates; Asphalt cement; Asphalt concrete; Asphalt plants; Drum containers; Fuel consumption; Hydrocarbons; Mixers; Moisture content; Oxidation; Particulates; Pollution; Temperature; Thermal efficiency
• Uncontrolled Terms: Batching
• Subject Areas: Construction; Energy; Environment; Geotechnology; Highways; Materials; I52: Construction of Pavements and Surfacings;

Filing Info

• Accession Number: 00399161
• Record Type: Publication
• ISBN: 0309037700
• Files: TRIS, TRB
• Created Date: Jan 31 1986 12:00AM