Thin layer asphaltic concrete density measuring using nuclear gages.

Scholl, Lewis G.; Laylor, H. M.; Rusnak, James S.; Oregon State Highway Division, Materials and Research Section

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ROSA P serves as an archival repository of USDOT-published products including scientific findings, journal articles, guidelines, recommendations, or other information authored or co-authored by USDOT or funded partners. As a repository, ROSA P retains documents in their original published format to ensure public access to scientific information.

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Thin layer asphaltic concrete density measuring using nuclear gages.

1989-03-01
By Scholl, Lewis G. ; Laylor, H. M. ; Rusnak, James S.

[PDF-2.56 MB]

English

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Creators:

Scholl, Lewis G. ; Laylor, H. M. ; Rusnak, James S.

Scholl, Lewis G. ; Laylor, H. M. ; Rusnak, James S. Less -
Corporate Creators:

Oregon State Highway Division, Materials and Research Section
Corporate Contributors:

United States. Federal Highway Administration
Subject/TRT Terms:

[+]

Alternatives Analysis Asphalt Concrete Asphaltic Concrete Density Backscattering Density Measurement Nuclear Gages Overlays (Pavements) Pavement Layers Thickness Thin Layer Nuclear Gage
Publication/ Report Number:

FHWA-EP-11-003
Resource Type:

Tech Report
Geographical Coverage:

Oregon
Corporate Publisher:

Oregon State Highway Division, Materials and Research Section
Abstract:

A Troxler 4640 thin layer nuclear gage was evaluated under field conditions to determine if it would provide improved accuracy of density measurements on asphalt overlays of 1-3/4 and 2 inches in thickness. Statistical analysis shows slightly improved accuracy resulting from the use of the Troxler 4640 gage compared to conventional gages. Other apparent benefits of this gage (data storage capabilities and digital readout of actual densities) are not true advantages because they are now available in gages which operate like the conventional gage tested here. One major disadvantage is that the gage lacks the versatility of conventional gages. The Troxler 4640 or similar gages are not recommended for widespread use.

Further statistical analysis shows that density as measured in the laboratory using cores is significantly higher than density measured by either of the two types of nuclear gages. The difference can be removed by developing an adjustment factor from core densities on every project. The amount of this difference varies from project to project (varying form 1.7 to 3.2 pcf for the conventional gage in backscatter mode).

The three different operating modes of the conventional gage were also evaluated and compared. As a result of this comparison, continued use of the backscatter mode with sand for seating is recommended.
Format:

PDF
Funding:

DTFH71-88-511-OR-08
Collection(s):

US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:efe20ce3b683b0645905d3ec03fed028a8a2805fe607ddb0f70f4600a2a49c2f
Download URL:

https://rosap.ntl.bts.gov/view/dot/22464/dot_22464_DS1.pdf
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Thin layer asphaltic concrete density measuring using nuclear gages.

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