ASPHALT ABSORPTION AS RELATED TO PORE CHARACTERISTICS OF AGGREGATES

ABSORPTION OF ASPHALT BY AGGREGATES IS OF PARAMOUNT IMPORTANCE TO ACCOUNT FOR THE LOSS DUE TO ABSORPTION BECAUSE, IN THE DESIGN OF DENSELY GRADED BITUMINOUS CONCRETE MIXES, A RELATIVELY SMALL VARIATION IN THE ASPHALT CONTENT WILL RESULT IN MIXTURES THAT ARE TOO RICH OR TOO LEAN. THOUGH PORE CHARACTERISTICS ARE THE MOST IMPORTANT PROPERTIES OF THE AGGREGATES, ESPECIALLY IN THE ABSORPTION PHENOMENON, MOST ATTEMPTS TO EVALUATE AGGREGATE ABSORPTION HAVE BEEN MADE WITHOUT DIRECT ANALYSIS OF THE PORE CHARACTERISTICS. A REVIEW OF THE LITERATURE ON PORE CHARACTERISTICS AND METHODS OF DETERMINATION OF ASPHALT ABSORPTION BY AGGREGATES ARE PRESENTED. ROCK CORES 1/2 IN. IN DIAMETER FROM SIX IOWA LIMESTONES, HAVING VARIABLE ABSORPTIVE CHARACTERISTICS, HAVE BEEN USED THROUGHOUT THE STUDY. MERCURY POROSIMETRY HAS BEEN EMPLOYED TO EVALUATE TOTAL EFFECTIVE POROSITY, PORE-SIZE DISTRIBUTION, PORE-VOLUME DISTRIBUTION, AND EXTENT OF THE "INK- BOTTLE" PORES. ASPHALT ABSORPTION HAS BEEN DETERMINED BY THE IMMERSION METHOD AND THE BULK-IMPREGNATED SPECIFIC GRAVITY METHOD. A RELATION BETWEEN PORE PARAMETERS AND ASPHALT ABSORPTION HAS BEEN ESTABLISHED BY REGRESSION ANALYSIS. PORE SIZE IN THE RANGE OF 0.1 TO 0.05 MICRONS SEEMS TO DETERMINE THE AMOUNT OF WATER ABSORPTION, WHEREAS PORE SIZE IN THE RANGE OF 0.7 TO 0.05 MICRONS DETERMINES THE ASPHALT ABSORPTION. /AUTHOR/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 97-111
  • Monograph Title: Asphalt mixture characterization and asphalt grading
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00211776
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Apr 2 1973 12:00AM