THE MOISTURE MECHANISM THAT CAUSES ASPHALT STRIPPING IN ASPHALTIC PAVEMENT MIXTURES

A LABORATORY TEST METHOD FOR PREDICTING STRIPPING (ASPHALT-AGGREGATE DEBONDING) IN SATURATED ASPHALT CONCRETE MIXTURES IS SHOWN. THE METHOD UTILIZES 4-INCH DIAMETER FIELD CORES OR LABORATORY SPECIMENS, AND CONSISTS OF EVALUATING SPLIT CYLINDER TEST RESULTS (TENSILE STRENGTHS) ON PAIR- GROUPS OF SPECIMENS IN WHICH SOME SPECIMENS FROM THE SAME GROUP ARE THERMAL CYCLED IN A SATURATED CONDITION (TO DUPLICATE FIELD STRIPPING CONDITIONS) AND OTHERS ARE MAINTAINED IN A DRY STATE BEFORE TESTING. THE DEVELOPMENT OF AN OPTIMUM SET OF SPLIT CYLINDER TEST CONDITIONS: RATE OF DEFORMATION AND TEMPERATURE, ARE INCLUDED. THESE CONDITIONS WERE MAINTAINED CONSTANT FOR SUBSEQUENT PRACTICAL TESTING. A "TENSILE STRENGTH RATIO," TSR WAS USED TO QUANTIFY THE AMOUNT OF STRIPPING AND TO RANK MIXTURES. ANTI-STRIPPING REMEDIES SUCH AS ADDITION OF LIME, USE OF HYDRATED LIME COATED AGGREGATES, ADDITION OF CATIONIC ASPHALT ADDITIVE, AND DECREASE IN VOIDS WERE EVALUATED USING TSR FOR A PROMINANT STRIPPING MIXTURE IN SOUTHEASTERN IDAHO CONTAINING INKOM AREA AGGREGATES. FIELD CORES FROM ACTUAL PAVEMENT PROJECTS IN 1970 WERE ALSO TESTED AND RANKED BY THE TSR METHOD FOR PREDICTING STRIPPING DAMAGE. HOPEFULLY, ADDITIONAL CORES WILL BE TESTED IN 1971 OR SO FOR DETERMINATION OF ACTUAL FIELD PERFORMANCE VERSUS THE PREDICTION. /AUTHOR/

  • Supplemental Notes:
    • 135 Pp, 34 FIG, 9 TAB, 3 APP
  • Corporate Authors:

    University of Idaho, Moscow

    Moscow, ID  USA  83844
  • Authors:
    • Lottman, R P
  • Publication Date: 1971-2

Subject/Index Terms

Filing Info

  • Accession Number: 00211676
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 2 1971 12:00AM