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Abstract:This study was one of two studies designated as Research Project 62-1SB to evaluate the use of nuclear devices in highway construction. (1) The primary objective of this study was to evaluate a nuclear density device for obtaining densities on asphaltic concrete pavements during or after construction. On evaluating this device an attempt has been made to correlate nuclear density results with densities obtained from roadway cores taken at identical locations. Efforts were also made to determine the minimum thickness of an asphaltic concrete pavement in which nuclear density readings would not be affected by the underlying material.
Although the relationship between the percent of standard reading and the roadway densities showed a definite trend, results from 144 roadway cores and 170 nuclear readings indicated that the actual density at a given percent of standard could vary as much as 4 lbs/cu ft. Results also indicated that nuclear density readings were not affected by the underlying material when taking densities on slab thicknesses of 2 inches or more. On the basis of the inconsistency of the results obtained, it was decided to discontinue any additional testing as outlined in the proposal and to report the completed results.
As a future course of action, it is intended to continue accumulating nuclear density data on various state projects to eventually obtain an adequate statistical evaluation. However, this additional work will not be performed under Highway Planning and Research funds.
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