MECHANISTIC EVALUATION OF SELECTED ASPHALT ADDITIVES (WITH DISCUSSION)

A host of man-made products are now available which can be used to improve the rheological and/or adhesive properties of asphalt cement. The laboratory evaluation of five of these asphalt additives (latex, block copolymer rubber, ethylene vinylacetate, finely dispersed polyethylene, and carbon black) is the subject of this report. The primary objective was to evaluate the performance of materials added to asphalt concrete mixtures for the purpose of reducing pavement cracking and/or rutting potential. The laboratory test program was designed to examine stiffness, brittleness and flexibility at low temperatures and high loading rates and evaluate the resistance to fatigue-type tensile loads such as those caused by vehicular loading and thermal variations. The research consisted of a systematic identification of promising types of asphalt additives designed to reduce plastic deformation and cracking in asphalt concrete pavements. Asphalt cements with and without additives were tested in the laboratory to determine chemical, rheological, elastic, fracture and thermal properties as well as sensitivity to heat and oxidation and compatibility between asphalts and additives. Asphalt concrete mixtures were tested to determine stability, compactibility and water susceptibility as well as stiffness, tensile, fatigue and creep/permanent deformation properties as functions of temperature.

• Corporate Authors:

  Association of Asphalt Paving Technologists (AAPT)

  400 Selby Avenue, Suite I
  St Paul, MN  United States  55102
• Authors:
  • Button, J W
  • Little, D N
  • Kim, Y
  • Ahmed, J
• Conference:
  • Association of Asphalt Paving Technologists Proc
• Publication Date: 1987

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 62-90
• Serial:
  • Volume: 56

Subject/Index Terms

• TRT Terms: Acetates; Additives; Asphalt concrete; Brittleness; Carbon black; Compactibility; Creep; Ethylene resins; Ethylenes; Fatigue (Mechanics); Flexibility; Laboratory tests; Latex; Low temperature; Mechanical analysis; Mechanistic design; Pavement cracking; Plastic deformation; Prevention; Properties of materials; Rubber; Rutting; Stability (Mechanics); Stiffness; Tension; Traffic loads; Vinyl resins
• Uncontrolled Terms: Polyethylene
• Old TRIS Terms: Ethylene vinylacetate; Water susceptibility
• Subject Areas: Design; Freight Transportation; Highways; Materials; Pavements; Security and Emergencies; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 00739791
• Record Type: Publication
• Files: TRIS
• Created Date: Aug 27 1997 12:00AM