MEASUREMENT OF THE DENSITY OF THE TOP INCH OF ASPHALT PAVING BY GAMMA RADIATION

AN INSTRUMENT WAS DEVELOPED TO MEASURE, NON- DESTRUCTIVELY, THE DENSITY OF THE TOP 2.5 CM LAYER OF AN ASPHALT PAVING. THE INSTRUMENT IS BASED ON THE PRINCIPLE OF GAMMA RAY BACKSCATTERING, BUT DIFFERS FROM THE USUAL INSTRUMENT IN THAT THE DEPTH OF MEASUREMENT IS ONLY 2.5 CM. THIS IS ACHIEVED BY USING A LOW ENERGY SOURCE, AM 241, WITH A SOURCE TO DETECTOR DISTANCE OF 5.5 CM, AND A NAI (T1) DETECTOR. THE INSTRUMENT WAS CHECKED IN THE FIELD AGAINST THE METHOD OF CORING, CUTTING AND WEIGHING, AND THE ROOT-MEAN- SQUARE DIFFERENCE BETWEEN THE METHODS WAS FOUND TO BE 0.02 G/CC, WHICH IS LESS THAN 1 PERCENT. /AUTHOR/

• Authors:
  • Preiss, K
  • Nadavia, D
  • Grossberg, H
• Publication Date: 1972-9

Media Info

• Pagination: p. 331-4
• Serial:
  • Matls & Structures, Res & Testing /Fr/
  • Volume: 5
  • Issue Number: 29

Subject/Index Terms

• TRT Terms: Bituminous mixtures; Density; Gamma rays; Measurement; Measuring instruments; Nondestructive tests
• Old TRIS Terms: Density measurement
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00211788
• Record Type: Publication
• Files: TRIS
• Created Date: Apr 30 1973 12:00AM