United States Department of Transportation
i
Precision and accuracy of nuclear asphalt content gauges in determining asphalt content in asphaltic concrete pavement.
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1988-06-17
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[PDF-2.49 MB]
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Abstract:Use of nuclear asphalt content gauges for determining asphalt content of asphaltic concrete pavement are gaining acceptance as an alternative method to the vacuum extraction process. The reasons nuclear asphalt content gauges are considered promising are as follows:
1) Recent technological advances in nuclear asphalt content gauges improved their precision and accuracy.
2) Relative safety of their use compared to the use of potentially hazardous solvents is advantageous.
3) A potential for lower overall test costs exist.
4) Ability to obtain more timely test results.
This study incorporated a multi-task work plan which included:
1) A literature review.
2) A survey of use by western states.
3) An in-house two phase testing program. A. Field bituminous mixture evaluation. B. Laboratory fabricated samples evaluation.
The first phase was performed by evaluating bituminous mixture used on the 12th Street SE - 24th Street SE Section, Mission Street (Salem) Project. This involved performing four asphalt content determinations on each sample. Two tests were evaluated by the nuclear asphalt content gauges, Troxler 324l-B and Campbell AC-2. The remaining two tests were evaluated by the vacuum extraction procedure, one by OSHD laboratory personnel and one by OSHD field personnel.
The second phase compared a nuclear asphalt content gauge, Campbell AC-2, to known asphalt contents of samples prepared and analyzed by the Materials and Research Laboratory of the Oregon State Highway Division.
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