CATIONIC ASPHALT EMULSIONS: HOW THEY DIFFER FROM CONVENTIONAL EMULSIONS IN THEORY AND PRACTICE

ASPHALT EMULSIONS ARE USED EXTENSIVELY IN THE HIGHWAY CONSTRUCTION INDUSTRY BEACUSE OF THE EASE OF APPLICATION AND THE VARIETY OF CONDITIONS UNDER WHICH THEIR PERFORMANCE IS SATISFACTORY. THIS PAPER IS CONCERNED WITH OIL-IN-WATER EMULSIONS WHEREIN ASPHALT IS THE OIL PHASE AND THE EMULSIFYING AGENTS ARE ANIONIC OR CATIONIC SOAPS. A REVIEW OF THE THEORY OF EMULSIONS COVERS THE CONCEPTS OF MICELLIZATION, SOLUBILIZATION, EMULSIFICATION, AND THE CLASSIFICATION OF EMULSIFYING AGENTS INTO ANIONIC, CATIONIC, OR NONIONIC TYPES, BASED ON THE MANNER IN WHICH THE EMULSIFIER DISSOCIATES IN AN AQUEOUS SYSTEM. IN ANIONIC EMULSIONS, THE SURFACE CHARGE OF THE EMULSIFIED PARTICLE IS NEGATIVE, WHILE IN CATIONIC EMULSIONS THE SURFACE CHARGE IS POSITIVE. ASPHALT EMULSIONS OF BOTH TYPES ARE USED. A CLASSIFICATION OF AGGREGATES BASED ON AGGREGATE SURFACE CHARGE IS PRESENTED. AGGREGATES RANGE IN EXTREMES FROM ELECTROPOSITIVE TO ELECTRONEGATIVE. ASPHALT EMULSION- AGGREGATE SYSTEMS ARE EVALUATED ON THE BASIS OF WHICH EMULSION TYPE SHOULD BE USED WITH A GIVEN AGGREGATE TYPE, AND WHY. CATIONIC ASPHALT EMULSIONS, WHICH ARE POSITIVELY CHARGED, ARE USED WITH ELECTRONEGATIVE AGGREGATES, WHEREAS ANIONIC EMULSIONS ARE USED WITH ELECTROPOSITIVE AGGREGATES. THE CURRENT STATUS OF CATIONIC AND ANIONIC ASPHALT EMULSIONS IS DESCRIBED, WITH SOME INDICATIONS AS TO PROBABLE FUTURE USES FOR EACH TYPE. THE NEED FOR THE EXISTENCE OF BOTH TYPES IS STRESSED. /AUTHOR/

  • Supplemental Notes:
    • Vol 38, pp 386-397, 14 FIG, 12 REF
  • Authors:
    • Mertens, E W
    • Wright, J R
  • Publication Date: 1959

Media Info

  • Monograph Title: Proceedings of the Thirty-Eighth Annual Meeting of the Highway Research Board, Washington, D.C., January 5-9, 1959
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00211640
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Sep 27 1971 12:00AM