DIELECTRIC MEASUREMENTS OF ASPHALT CONTENT, FINAL REPORT

PRESENT METHODS OF MEASURING ASPHALT CONTENT IN ASPHALTIC PLANT MIXES ARE EITHER TIME CONSUMING OR COSTLY. THE DIFFERENCES IN DIELECTRIC PROPERTIES OF ASPHALT AND AGGREGATES SUGGEST THAT AN INEXPENSIVE INSTRUMENT MIGHT BE DEVELOPED WHICH COULD DETERMINE ASPHALT CONTROL BY MEASUREMENTS OF THIS DIFFERENCE. THE DIELECTRIC CONSTANT OF TYPICAL ABSTRACT MIXES WAS DETERMINED BY MEASURING THE CHANGE IN CAPACITANCE OF A PARAELLEL RESONANCE CIRCUIT. THE DIELECTRIC LOSS WAS DETERMINED BY MEASURING THE VOLTAGE OF THE RESONANCE CIRCUIT. FREQUENCIES USED WERE FROM 50 TO 200,000 CYCLES PER SECOND. A VARIETY OF COMBINATIONS OF CAPACITOR PLATES AND ELECTRODES WERE USED TO OBTAIN OPTIMUM OUTPUT VALUES. AFTER CONSIDERABLE WORK, IT WAS TENTATIVELY CONCLUDED THAT THE DIELECTRIC READINGS WERE AS DEPENDENT UPON THE DENSITY OF THE MIX AS ON THE ASPHALT CONTENT. TO MEASURE ASPHALT CONTENT IT WILL BE NECESSARY TO CONTROL OR MEASURE THE DENSITY OF THE SAMPLE. /CDH/

  • Supplemental Notes:
    • 8 Pp, 9 Fig, 2 TAB
  • Corporate Authors:

    Colorado Department of Highways

    Planning and Research Division, 4201 East Arkansas Avenue
    Denver, CO  United States  80222
  • Publication Date: 1967-8

Subject/Index Terms

Filing Info

  • Accession Number: 00211696
  • Record Type: Publication
  • Files: TRIS, STATEDOT
  • Created Date: Nov 8 1971 12:00AM