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Title: EXAMINATION OF GAMMA-RAY METHOD FOR MEASURING BULK SPECIFIC GRAVITY OF HOT-MIX ASPHALT CONCRETE
Accession Number: 00965419
Record Type: Component
Record URL: Availability: Transportation Research Board Business Office 500 Fifth Street, NW Find a library where document is available Abstract: Much attention has been given to the determination of bulk specific gravity (Gmb) of compacted hot-mix asphalt (HMA) specimens. For relatively open-graded HMA mixtures, such as those produced by Superpave and stone matrix asphalt design methods, perceived potential shortcomings in traditional test methods may be pronounced. Recently, a new device was introduced for measuring Gmb that features the use of gamma-ray technology. To evaluate the efficacy of the device, 221 compacted HMA specimens were tested with three test methods: saturated surface dry (SSD) (AASHTO T-166), vacuum-sealing (Corelok), and gamma-ray technology (CoreReader). Each specimen was tested three times in each of the three methods. The specimens represented field-sampled and laboratory-prepared mixtures, 12.5-mm and 25-mm nominal maximum aggregate sizes, and a variety of aggregates typically used in Arkansas. Test results indicated that statistically significant differences exist between mean Gmb-values generated by each of the three testing methods. In general, the vacuum-sealing method yielded the lowest Gmb-values, followed (in order of low to high) by the gamma-ray and SSD methods. Significant differences in the variability of test results were not observed between test methods. In ease of testing and testing variability, the CoreReader gamma-ray device does not appear to offer significant advantages for determining the bulk specific gravity of compacted HMA cores. Further, departments of transportation wishing to replace or allow alternatives to traditional SSD-based tests should consider the impact of test results on existing volumetric property specifications.
Supplemental Notes: This paper appears in Transportation Research Record No. 1832, Bituminous Paving Mixtures 2003.
Language: English
Corporate Authors: Transportation Research Board 500 Fifth Street, NW Authors: Hall, K DWilliams, S GGriffith, F TPagination: p. 148-154
Publication Date: 2003
Serial: ISBN: 0309085667
Features: Figures
(4)
; Photos
(2)
; References
(7)
; Tables
(3)
TRT Terms: Subject Areas: Highways; Materials; I31: Bituminous Binders and Materials
Files: TRIS, TRB, ATRI
Created Date: Nov 5 2003 12:00AM
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