DYNAMIC TESTING: DENSITY ON THE RUN

Presented herein is a discussion of a new nondestructive device that will measure density continuously while hot asphaltic concrete is being compacted by the contractor. Density on the run consists of a nuclear source and detectors mounted inside a rotating drum, 6 5/8 in. in diameter by 18 in. long. It is placed directly on a steel wheel roller compactor so that density can be reported instantly to the operator, density that may change (intentionally or unintentionally) because of changes in ballast, rolling speed, frequency, and amplitude of vibration and temperature. This device can be removed from the roller in minutes and mounted on a two-wheeled cart to measure and optimize density performance of the asphalt paver. It can also be used to take stationary readings and provide moisture data for base course construction. Density on the run may be used to (a) deal with shortcomings of nuclear and conventional coring specifications in which one test in 1,200 lane-ft is often considered adequate agency acceptance; (b) reduce rolling hours and optimize asphaltic concrete paver performance to avoid penalties and solve problem variables of compaction; (c) measure density of large areas, furnishing the added data to statistically analyze uniformity of density and its relationship to quality in flexible pavements; (d) offset the shortcomings of stationary nuclear density meters; and (e) implement high-speed nuclear testing and pneumatic roller compaction testing and measure the density of thin lift overlays as small as 3/4 in. in 1-in. increments.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/trr/1988/1178/1178-003.pdf
• Record URL:
  https://scholar.google.com/scholar_lookup?title=DYNAMIC+TESTING%3A+DENSITY+ON+THE+RUN&author=D.+Seaman&author=D.+Seaman&publication_year=1988
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/030904717X
• Supplemental Notes:
  • This paper appears in Transportation Research Record No. 1178, Flexible Pavement Construction. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
• Authors:
  • Seaman, D J
  • Seaman, Donald J
• Publication Date: 1988

Media Info

• Features: Figures; Photos; References;
• Pagination: p. 16-22
• Monograph Title: Flexible pavement construction
• Serial:
  • Transportation Research Record
  • Issue Number: 1178
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Asphalt concrete; Density; Dynamic tests; Flexible pavements; High speed ground transportation; High speed vehicles; Nondestructive tests; Nuclear tests; Paving; Portable equipment; Speed; Testing equipment
• Subject Areas: Construction; Highways; Materials; Railroads; I31: Bituminous Binders and Materials; I52: Construction of Pavements and Surfacings;

Filing Info

• Accession Number: 00486156
• Record Type: Publication
• ISBN: 030904717X
• Files: TRIS, TRB, ATRI
• Created Date: Aug 31 1989 12:00AM