You are being redirected because this document is part of your ASTM Compass® subscription.
    This document is part of your ASTM Compass® subscription.

    If you are an ASTM Compass Subscriber and this document is part of your subscription, you can access it for free at ASTM Compass
    Volume 50, Issue 1 (May 2021)

    A New Low-Activity Nuclear Density Gauge for Soil Density Measurements

    (Received 10 February 2020; accepted 25 February 2021)

    Published Online: 12 May 2021

    CODEN: JTEVAB

      Format Pages Price  
    PDF (1.48 MB) 22 $25   ADD TO CART

    Cite this document

    X Add email address send
    X
      .RIS For RefWorks, EndNote, ProCite, Reference Manager, Zoteo, and many others.   .DOCX For Microsoft Word



    Abstract

    For decades, nuclear density gauges have been used to measure the density and moisture content of soil during compaction testing in road and embankment construction. Worldwide regulatory agencies consider nuclear density gauges as controlled devices because of their inclusion of radioisotope sources. Regulatory requirements, such as the need for licensing, special storage, special transportation procedures, gauge operator training, and personal dosimetry, have become burdens for gauge users. Recently, a new nuclear density gauge for measuring soil wet density was declared exempt from licensing and other nuclear regulatory requirements in the United States. The new gauge uses an extremely low-activity radioisotope source. It further incorporates a separate probe operating on electromagnetic principles for soil moisture measurement or any other moisture measurement method the user desires. This paper presents the design features and measurement properties of this low-activity nuclear density gauge and its associated moisture probe. The measurement properties were determined from laboratory and field studies that were conducted in North Carolina, United States. These studies showed that the sensitivity and precision of wet density measurements made by the low-activity nuclear density gauge were similar to those made by a conventional nuclear density gauge. The wet density measurements made by the low-activity gauge and conventional gauge showed a strong correlation and agreement. For the two field sites studied, a silty sand subbase and a cement-treated aggregate base course, the dry density agreement between the low-activity nuclear density gauge/moisture probe and the conventional nuclear density gauge was within 3 lb/ft3 (48 kg/m3).

    Author Information:

    Dep, Linus
    Department of Engineering–R&D, Troxler Electronic Laboratories, Research Triangle Park, NC

    Troxler, Robert E.
    Department of Engineering–R&D, Troxler Electronic Laboratories, Research Triangle Park, NC

    Sawyer, James
    Materials & Tests Unit, North Carolina Department of Transportation, Raleigh, NC

    Mwimba, Sumuna
    Department of Engineering–R&D, Troxler Electronic Laboratories, Research Triangle Park, NC


    Stock #: JTE20200483

    ISSN:0090-3973

    DOI: 10.1520/JTE20200483

    Author
    Title A New Low-Activity Nuclear Density Gauge for Soil Density Measurements
    Symposium ,
    Committee D18