United States Department of Transportation
i
Density of Thin Lift Bituminous Mixtures by Nuclear Methods
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1991-05-01
[PDF-7.77 MB]
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Edition:Final Report
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Abstract:Densities of bituminous mixtures, as determined by eight nuclear density gauges, were compared to the densities of cores at the same test locations. The densities determined by the two methods did not agree and varied with each gauge. However, the differences were relatively constant suggesting that good agreement could be obtained by use of a correction factor with the nuclear gauge results. The average of 16 nuclear density readings and four cores (four nuclear density readings per core location) were used to establish a daily correction factor. Analysis of the test results indicate that the MHTD inspector can use this method of correction to determine bituminous mixture density with confidence. A correction factor for each day's production is recommended. The previous day's correction factor can be used to estimate density until cores can be cut and a new daily correction factor determined. Relying on uncorrected nuclear density readings for acceptance testing is not recommended. Some cores should always be cut to verify the accuracy of the gauge and actual density of the compacted bituminous mixture. Gauge position in relation to the roller direction and the use of a filler material did not significantly affect the results of gauges during this study.
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