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• W764693312 abstract "In 1992, the Nevada Department of Transportation (NDOT) sponsored a research project at the university of Nevada to assess the applicability of the newly developed Superpave binder grading systems under Nevada's. conditions. The project comprised of three major tasks which consisted of evaluating the rheological properties of Nevada's binders toward low temperature cracking of HMA mixtures and identify the best method to evaluate low temperature resistance of HMA mixtures, and developing a demerit system to be used with the Superpave binder grading system. A total of fifty-five binders were evaluated and graded using the Superpave binder grading system. Atl of the binders were used on actual construction projects. A large percentage of the evaluated binders were polymer modified AC-20 referred to as AC-20P. Such binders are very commonly used In northern Nevada due to a wide range of expected temperatures. The performance grading of these blnders showed that AC-20P binders can fall over a wide range of performance grades. The AC-20P's high temperature grades ranged from 52 to 64 while their low temperature grades ranged from -16 to -40 . The Superpave recommended PG grades were determined for each project and checked against the PG grades of the binders used. It was concluded that the majority of the binders violate the Superpave recommended PG grade. On the other hand the field performance of these projects tor the past six years did no t indicate any potential problems. Therefore' it was concluded that the Superpave binder grading system must be modified prior to its full implementation in Nevada. The low temperature cracking resistance of twenty-one mixtures was evaluated using the TSRST. The fracture temperatures of the mixtures were evaluated using samples manufactured from lab mixed-lab compacted (LMLC), field mixed lab compacted (FMLC) and LMLC with PAV aged binders materials (PAV-LMLC). The objective of this experiment was to identify the most appropriate method of assigning a critical low temperature for the HMA mixtures. The data showed that the fracture temperature determined by the TSRST is not consistent. In some cases the TSRST measured fracture temperatures on the LMLC mixtures are warmer than the PAV-LMLC mixtures. lt was concluded that the critical low temperature determined by the Superpave Binder grading system using the BR device is conservative for the majority of the cases which makes it an acceptable alternative to mixture testing until a more consistent mixture evaluation system is developed." @default.
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• W764693312 date "1998-12-01" @default.
• W764693312 modified "2023-09-23" @default.
• W764693312 title "Characterization of Nevada's Binders and Low Temperature Properties of Mixtures Using SHRP Tests. Part II. Characterization of Nevada's Binders Using Superpave Technology" @default.
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