THIN LAYER NUCLEAR ASPHALT DENSITY METER INVESTIGATION

Main Roads Western Australia traditionally used coring techniques to detere use of a Troxler 4640B thin layer nuclear density meter was investigated to deliver density results immediately after the laying process. The project involved the investigation of calibration procedures and the correlation of densities derives from the various calibration equations to the densities of cores. The factory calibration equation and a special calibration equation, developed on a standard density block, gave variable and at times poor agreement with densities obtained from core samples. Special calibration equations developed on an 100 mm thick asphalt block and on a block closely resembling the pavement structure provided only minor improvement. The use of linear regression equations to calculate densities from counts of the detector responding to radiation passing mainly through the upper horizon of the pavement was then investigated. The densities calculated by these equations were in close agreement with the densities of cores cut from the upper 25.4 mm horizon. (a) For the covering abstract of this conference see IRRD abstract no. 861222.

• Record URL:
  • http://arrbknowledge.com
• Corporate Authors:

  ARRB

  Melbourne, Victoria  Australia 
• Authors:
  • NIELSEN, W A
  • HAMORY, G I
• Conference:
  • 17TH ARRB CONFERENCE, GOLD COAST, QUEENSLAND, 15-19 AUGUST 1994; PROCEEDINGS; VOLUME 17, PART 2
• Publication Date: 1994

Language

• English

Media Info

• Features: References;
• Pagination: p. 165-80

Subject/Index Terms

• TRT Terms: Accuracy; Bituminous mixtures; Building materials; Calibration; Conferences; Densitometers; Density; Field tests; Measuring instruments; Properties of materials; Tests
• Uncontrolled Terms: Nuclear densitometer
• ITRD Terms: 6155: Apparatus (measuring); 6160: Back scattering apparatus; 4967: Bituminous mixture; 6171: Calibration; 8525: Conference; 5908: Density; 6440: Error; 6226: In situ; 4555: Material (constr); 5925: Properties; 6255: Test
• Subject Areas: Data and Information Technology; Materials;

Filing Info

• Accession Number: 00669740
• Record Type: Publication
• Source Agency: ARRB
• Files: ITRD, ATRI
• Created Date: Dec 23 1994 12:00AM