DETERMINATION OF ASPHALT CONTENT OF BITUMINOUS MIXTURES BY MEANS OF RADIOACTIVE ISOTOPES

WITH A PROPER COMBINATION OF RADIOATIVE ISOTOPES AND ELECTRONIC EQUIPMENT, IT IS POSSIBLE TO DETERMINE THE RELATIVE CONCENTRATION OF HYDROGEN IONS IN A BITUMINOUS MIXTURE. THE ONLY SOURCE OF HYDROGEN IONS IN A DRY BITUMINOUS MATERIAL IS THE BITUMEN ITSELF. THUS, IT IS POSSIBLE TO DETERMINE THE PERCENT OF BITUMEN IN A MIX FROM CURVES WHICH ARE BASED ON TESTS OF STANDARD SAMPLES. FROM DATA ACCUMULATED BY A 25-MILLICURIE SOURCE OF RADIUM-D BERYLLIUM AND AN ENRICHED BORON-FLUORID 10 COUNTING TUBE, A CURVE OF COUNTS OF SLOW NEUTRONS VS. ASPHALT CONTENT, IN POUNDS PER CUBIC INCH, IS PRESENTED FOR THE SAMPLES TESTED. ALSO SHOWN IS A FAMILY OF CURVES RELATING COUNTS OF SLOW NEUTRONS TO PERCENT OF ASPHALT BY WEIGHT FOR VARIOUS TOTAL UNIT WEIGHTS OF SAMPLES. A TABLE IS PRESENTED GIVING MIX DATA AND TEST RESULTS FOR ALL SAMPLES TESTED. IT IS CONCLUDED THAT A QUICK AND REASONABLY ACCURATE TECHNIQUE FOR DETERMINING ASPHALT CONTENT BY RADIOACTIVE ISOTOPES HAS BEEN FOUND. /AUTHOR/

  • Supplemental Notes:
    • Vol 35, pp 322-326, 2 FIG, 1 TAB, 3 PHOT, 1 REF
  • Authors:
    • Lamb, D R
    • Zoller, J H
  • Publication Date: 1956

Media Info

  • Monograph Title: Proceedings of the Thirty-Fifth Annual Meeting of the Highway Research Board, Washington, D.C., January 17-20, 1956
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00211634
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 15 1971 12:00AM