SPREADING BEHAVIOR OF BITUMINOUS MATERIALS UPON AQUEOUS SUBSTRATES

SPREADING CHARACTERISTICS OF THE VARIOUS BITUMINOUS MATERIALS IS OF UTMOST FUNDAMENTAL IMPORTANCE IN THE INCORPORATION OF SUCH SUBSTANCES INTO AND UPON MATERIALS USED IN CONSTRUCTION. THE SURFACE PRESSURE BALANCE WAS USED IN THIS WORK TO MEASURE THE SPREADING BEHAVIOR OF SUCH MATERIALS THROUGH THE FORCE EXERTED BY FILMS UPON A FLOATING PRESSURE INDICATOR. BITUMINOUS FILMS WERE SPREAD UPON VARIOUS AQUEOUS SUBSTRATES AT 25 C. AND THEIR SURFACE PRESSURES MEASURED. THE BITUMINOUS SUBSTANCES USED, WHICH INCLUDED ASPHALTS, RECLAIMED ASPHALTS, GILSONITE, COAL TAR, AND CUTBACK SOLVENT, SPREAD POORLY UPON PURE WATER. THE SPREAD FILMS WERE UNDOUBTEDLY POLYMOLECULAR IN THICKNESS. UPON ACID WATER OR UPON ANILINE HYDROCHLORIDE SOLUTIONS THE SPREADING AREAS WERE ABOUT THREE TIMES THE AREAS ON PURE WATER. COMMON SALT AND BASIC SOLUTIONS HAD LITTLE EFFECT UPON THE AREAS. ALUMINUM SULFATE, WHICH HYDROLYZES ACID, WAS BUT SLIGHTLY SUPERIOR TO WATER. COAL TAR SHOWED POORER SPREADING TENDENCIES UPON SALTS THAN DID THE VARIOUS ASPHALTS. WHEN OXIDIZING AGENTS WERE USED IN DILUTE SOLUTION, SPREADING EFFICIENCIES INCREASED REMARKEDLY. SOLUTIONS OF POTASSIUM PERMANGANATE WERE ESPECIALLY EFFECTIVE IN CAUSING INCREASED SPREADING, GIVING SURFACE AREAS UP TO 20 TIMES THE AREAS OBTAINED ON PURE WATER. THE CURVES SO PRODUCED SHOWED AN UNEXPECTED HORIZONTAL BENCH. HERE THE AREAS OCCUPIED PER SURFACE MOLECULE CHANGED BY AS MUCH AS 10 ANGSTROMS SQUARED WITH NO CHANGE IN SURFACE PRESSURE. WHEN ASPHALT WAS REFLUXED WITH KMN04 AND SPREAD ON WATER A SIMILAR BENCH OCCURRING AT HIGHER PRESSURES WAS EVIDENT. SOME RECLAIMED CITY PAVEMENT ASPHALT THAT HAD BEEN IN USE ABOUT 20 YEARS SHOWED A SIMILAR BENCH AT MEDIUM PRESSURES WITH AREAS PER MOLECULE FIVE TO EIGHT TIMES THE USUAL WATER VALUE. THESE PESSURE BENCHES SEEM TO BE ASSOCIATED WITH OXIDATION OF BITUMINOUS MATERIALS OR HYSTRESIS EFFECTS IN THE SPREAD SURFACE FILM. /AUTHOR/

  • Supplemental Notes:
    • Vol 33, pp 281-292, 7 FIG, 1 TAB, 19 REF
  • Authors:
    • Andrews, A C
    • Sawhill, D L
    • Ziem, R W
    • Jacobsen, R J
  • Publication Date: 1954

Media Info

  • Monograph Title: Proceedings of the Thirty-Third Annual Meeting of the Highway Research Board, Washington, D.C., January 12-15, 1954
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00211624
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: May 22 1972 12:00AM