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

An apparatus was developed for the non-destructive measurement of the density of the 2.5 cm-thick upper layer of a flexible pavement. The apparatus uses the principle of gamma ray backscattering but is different from normally used equipment in that the depth of measurement does not exceed 2.5 cm; this result was obtained by using a low-energy source (am 241) situated at a distance of 5.5 cm from the detector, the latter being a na(ti) detector. A comparison was made with the technique of core boring, scraping and weighing, and the mean quadratic deviation observed between the two methods was 0.02 gr/cm cubed, e.g. Less than 1%. /TRRL/

• Corporate Authors:

  Rilem

  12 Rue Brancion
  75737 Paris Cedex,   France 
• Authors:
  • Preiss, K
  • Nadavia, D
  • Grossberg, H
• Publication Date: 1972-9-10

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 331-334
• Serial:
  • Materiaux & Constructions/Materials & Structures
  • Volume: 5
  • Issue Number: 29
  • Publisher: International Union of Testing and Research Laboratories for Mat & St

Subject/Index Terms

• TRT Terms: Backscattering; Density; Flexible pavements; Gamma rays; Measurement; Measuring instruments; Nondestructive tests; Pavement layers; Surfacing; Tests; Texture
• Old TRIS Terms: Back-scattering apparatus; Density measurement
• ITRD Terms: 4967: Bituminous mixture; 5908: Density; 6769: Diffusion; 6706: Gamma ray; 6216: Non destructive testing; 2972: Surfacing; 6255: Test; 2980: Wearing course
• Subject Areas: Geotechnology; Highways; Materials; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 00096036
• Record Type: Publication
• Source Agency: Laboratoire Central des Ponts et Chausees (LCPC)
• Files: ITRD, TRIS
• Created Date: Sep 30 1975 12:00AM