NUCLEAR BITUMINOUS CONCRETE RESEARCH

THIS STUDY WAS INITIATED AS A PRELIMINARY EVALUATION OF A PORTABLE NUCLEAR GAUGE DEVELOPED TO ACCURATELY DETERMINE THE ASPHALT CONTENT OF HOT BITUMINOUS CONCRETE. THE UNIT WAS DEVELOPED UNDER RESEARCH CONTRACT WITH NUCLEAR CHICAGO CORPORATION, CHICAGO, ILLINOIS, TO REQUIREMENTS SET FORTH BY THE PENNSYLVANIA DEPARTMENT OF HIGHWAYS. STATISTICS INVOLVED IN THE RANDOM DECAY OF THE SOURCE AND THE BACKGROUND COUNT PREVIOUSLY HAD TENDED TO PLACE A LIMIT ON SENSITIVITY OF NUCLEAR DEVICES. THIS WAS USUALLY ON THE ORDER OF PLUS OR MINUS 0.25 PERCENT OF ACTUAL CONTENT. THE SENSITIVITY OF THE NUCLEAR CHICAGO GAUGE, HOWEVER, WAS SHOWN IN THE STUDY TO BE MUCH BETTER THAN THIS, USING INITIAL CALIBRATION RESULTS. SAMPLES OF HOT BITUMINOUS CONCRETE WERE PREPARED TO DEVELOP AN INITIAL SYSTEM CALIBRATION. MIXES WERE TESTED WITH THE NUCLEAR GAUGE AND THE NUCLEAR TEST RESULTS WERE THEN PAIRED WITH ACTUAL DESIGN ASPHALT CONTENT TO YIELD A REGRESSION CURVE. STANDARD DEVIATIONS WERE COMPUTED AND, AT TIMES, RESULTS COMPARED TO IMMEREX EXTRACTION RESULTS FOR THE SAME SAMPLES. /AUTHOR/

  • Supplemental Notes:
    • Hpr, 64-15
  • Corporate Authors:

    Pennsylvania Department of Highways

    400 North Street
    Harrisburg, PA  USA  17120-0095
  • Authors:
    • Grey, R L
  • Publication Date: 1967-8

Subject/Index Terms

Filing Info

  • Accession Number: 00210381
  • Record Type: Publication
  • Source Agency: Bureau of Public Roads /US
  • Files: TRIS
  • Created Date: Dec 21 1994 12:00AM