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Improving the Performance-Graded Asphalt Binder Specification: Final Report.
| 题名： | Improving the Performance-Graded Asphalt Binder Specification: Final Report. |
| 作者： | Hajj, R.; Filonzi, A.; Bhasin, A. |
| 关键词： | Performance grading, Multiple stress creep and recovery (MSCR) test, Texas (state), Performance-graded asphalt binder, Dynamic shear rheometer (DSR), Asphalt mixtures, Specification requirements |
| 摘要： | The Performance Grading (PG) specification is currently used as the primary purchase specification and binder classification system in the state of Texas and many other parts of the world. Since its inception, binder production has evolved to include new technologies and additives that can be used to improve binder performance. However, in some cases such binders may also prematurely fail in asphalt pavements while still meeting the existing specification requirements. In light of this shortcoming with the PG specification, this project reviewed various new methods that can be utilized as alternatives or in a complimentary manner to the current specification. A variety of field and laboratory modified binders were evaluated using a suite of tests along with mixtures that incorporated these binders in order to evaluate the most effective performance indicators for asphalt binder specification. Parameters from the Multiple Stress Creep and Recovery (MSCR) test showed a good correlation with rutting of asphalt mixtures and parameters from the poker chip test showed a good correlation with cracking of asphalt binders. A method to measure low-temperature properties of the binder using a 4-mm diameter geometry with the Dynamic Shear Rheometer (DSR) was evaluated and the analytical method used with the resulting data was further developed for use as a surrogate to traditional tests. Based on the results, this study recommends the implementation of the MSCR, the 4-mm plate geometry for low temperature DSR testing in certain scenarios, and the poker chip test as an indicator for cracking resistance. |
| 报告类型： | 科技报告 |
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