Asphalt Content of Hot Bituminous Mixes Using Nuclear Asphalt Content Gauges

Wence, Donald E.; George, Anthony J.; Dominick, Dick; Smith, Jeffrey; Oregon. Department of Transportation. Materials and Research Section

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Asphalt Content of Hot Bituminous Mixes Using Nuclear Asphalt Content Gauges

1991-10-01
By Wence, Donald E. ; George, Anthony J. ; Dominick, Dick ; ...

[PDF-3.11 MB]

English

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Creators:

Wence, Donald E. ; George, Anthony J. ; Dominick, Dick ; Smith, Jeffrey

Wence, Donald E. ; George, Anthony J. ; Dominick, Dick ; Smith, Jeffrey Less -
Corporate Creators:

Oregon. Department of Transportation. Materials and Research Section
Corporate Contributors:

United States. Federal Highway Administration
Subject/TRT Terms:

[+]

Asphalt Concrete Pavements Asphalt Content Asphalt Mixtures Nuclear Asphalt Content Gauges Nuclear Gages
Publication/ Report Number:

FHWA-OR-MA-89-06
Resource Type:

Tech Report
Geographical Coverage:

Oregon
Corporate Publisher:

Oregon. Department of Transportation. Materials and Research Section
Abstract:

The Oregon State Highway Division (OSHD) currently uses the Vacuum Extraction procedure for acceptance testing for asphalt content of asphaltic concrete. Because of the concern with Chlorinated solvent, i.e. safety, disposal, and expense, OSHD has investigated the potential of Nuclear Asphalt Content Gauges. In June 1988, OSHD published a report titled "Precision and Accuracy of Nuclear Asphalt Content Gauges in Determining Asphalt Content in Asphaltic Concrete Pavement: This report concluded a proper calibration is essential, moisture correction is necessary, and the Nuclear Gauges are cost effective. This study is to validate previous findings, evaluate field performance, and develop necessary calibration and operation procedures. A total of thirteen OSHD projects were included in this study. Asphalt content comparisons were evaluated between Extraction, Nuclear Gauge, Tank Stick, and Plant Meter. The latest model Nuclear Gauges, Troxler 3241-C and CPN AC-2, were used. Gradation comparisons were evaluated between extracted and cold feed grading. This study concluded the asphalt gauge to be a precise and accurate instrument, but the reading must be corrected for moisture content. The Microwave moisture correction is not acceptable, therefore, a detailed procedure was written for moisture correction using a conventional oven. Also, a new nuclear gauge procedure entailed the use of calibration transfers for field operation. Oregon is proceeding with outfitting each OSHD Region with asphalt nuclear gauges and is immediately reducing solvent usage by replacing vacuum extraction testing of open graded and plant mix bituminous base mixtures with a Tank Stick/Meter asphalt content determination method.
Format:

PDF
Funding:

DTFH71-88-511-OR-09
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:358047c625970445f5643b4e6120281b001ebb5559c9eac415ae992ed0e220cc
Download URL:

https://rosap.ntl.bts.gov/view/dot/22568/dot_22568_DS1.pdf
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Asphalt Content of Hot Bituminous Mixes Using Nuclear Asphalt Content Gauges

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