A LABORATORY STUDY OF ANTI-STRIPPING ADDITIVES FOR HOT BITUMINOUS MIXES

THIS PAPER PRESENTS DATA OBTAINED FROM USING TWO TESTING METHODS DESIGNED FOR HOT MIXES. THE FIRST IS A MODIFIED STATIC IMMERSION TEST DEVISED BY THE AUTHORS; THE SECOND IS THE IMMERSION-COMPRESSION TEST FOLLOWING ASTM DESIGNATION D 1075-54T. IN THE STATIC IMMERSION TEST THE STONE CHIPS WERE HEATED AND COVERED WITH A PENETRATION-TYPE ASPHALT. THE RESISTANCE TO STRIPPING WAS EVALUATED (1) BY IMMERSION IN WATER AND (2) BY EXPOSURE OF COATED CHIPS TO NATURAL WEATHERING. AGGREGATES FROM 24 DIFFERENT MASSACHUSETTS SOURCES AND VIRGINIA DOLOMITE WERE USED WITH HEAT-STABLE ADDITIVES FROM 12 MANUFACTURERS. RESULTS DO NOT SHOW SIGNIFICANT VARIANCES BETWEEN THE ADDITIVES, BUT DISTINCT AGGREGATE DIFFERENCES WERE FOUND. THE HIGHEST STRIPPING WAS OBSERVED WITH VIRGINIA DOLOMITE, FOLLOWED BY MASSACHUSETTS RHYOLITE. RHYOLITE WAS SELECTED FOR USE IN THE IMMERSION- COMPRESSION TEST BEACUSE OF ITS POOR PERFORMANCE IN THE STATIC TEST. THE MIX COMPLIES WITH MASSACHUSETTS SPECIFICATIONS FOR BOTTOM COURSES (1-IN. MAXIMUM SIZE, WHICH HAS A HIGH PERCENTAGE OF VOIDS, ALLOWING WATER TO ENTER EASILY). TWO SERIES OF TESTS WERE PERFORMED USING THE 12 ADDITIVES. HYDRATED LIME FILLER WAS USED IN A SEPARATE TEST. SERIES I DID NOT INCLUDE ANY PREHEATING OF THE ASPHALT OR ADDITIVES, WHEREAS SERIES II REQUIRED A 72-HR HEAT TREATMENT (DOUBLE-CAN METHOD). A STATISTICAL ANALYSIS OF ALL DATA SHOWS THAT CERTAIN ADDITIVES AID SOMEWHAT IN RETAINING THE COMPRESSIVE STRENGTH OF SPECIMENS. /AUTHOR/

  • Supplemental Notes:
    • Vol 38, pp 408-430, 7 FIG, 6 TAB, 16 REF, 2 APP
  • Authors:
    • Wood, R V
    • Tons, E
    • Winterkorn, H F
  • 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: 00211650
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Sep 27 1971 12:00AM