TURBULENT-MASS PROCESS SPEEDS ASPHALT OPERATION

HOT LIQUID ASPHALT, MIXED WITH WATER OR WITH WATER CONTAINING CHEMICALS TO PROMOTE COHESION AND ADHESION IN MIXTURES, IS COMBINED WITH THE AGGREGATE IN THE DRYER DRUM IN A NEW TURBULENT-MASS MIXING PROCESS. THE WATER VAPOR GENERATED BY THE HEAT OF THE TURBULENT-MASS DISPERSES THE ASPHALT QUICKLY AND ALSO ACTS AS AN OXIDATION BARRIER. HEATING AND MIXING ARE ACCOMPLISHED IN AN INERT ATMOSPHERE OF WATER VAPOR AND SPENT GASES OF COMBUSTION. AS A CONSEQUENCE, THERE IS VERY LITTLE HARDENING OF THE ASPHALT. THE PROCESS OFFERS THE FOLLOWING ADVANTAGES: (1) HIGH PRODUCTION RATES; (2) LOWER MIX TEMPERATURES; (3) GOOD CONTROL OF AGGREGATE GRADATION AND ASPHALT CONTENT; (4) HIGH QUALITY MIXTURES BECAUSE OF LESS OXIDATION OF THE ASPHALT; AND (5) LESS POLLUTION AND NO NEED FOR EXPENSIVE ANTI-POLLUTION EQUIPMENT.

• Publication Date: 1972-5

Media Info

• Features: Tables;
• Pagination: p. 120-3
• Serial:
  • Roads and Streets
  • Volume: 115
  • Issue Number: 5
  • Publisher: Donnelley (Reuben H) Corporation

Subject/Index Terms

• TRT Terms: Adhesion; Aggregate gradation; Asphalt content; Asphalt hardening; Chemicals; Cohesion; Hot mix asphalt; Liquid asphalt; Mixers; Mixing; Oxidation; Pollution; Productivity; Quality control; Temperature; Water
• Uncontrolled Terms: Quality
• Old TRIS Terms: Mixing procedures; Mixing temperature
• Subject Areas: Construction; Environment; Highways;

Filing Info

• Accession Number: 00215654
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 20 1974 12:00AM