United States Department of Transportation
i
Selection and evaluation of performance-graded asphalt binders for Virginia.
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1999-06-01
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By Prowell, BD
[PDF-2.29 MB]
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Edition:Final report 6/94-6/99
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Abstract:This study recommended performance-graded (PG) binders to be used in hot-mix asphalt in Virginia. Ten conventional viscosity-graded asphalt cements, representing the asphalt typically available in Virginia, were graded under the PG system to develop a cross-reference with the new system. Based on the past performance of the viscosity-graded asphalt and the PG binder testing, PG 64-22 was selected as the base grade of asphalt for Virginia. Laboratory studies were performed with the Georgia loaded-wheel tester and asphalt pavement analyzer to evaluate the practice of increasing the high-temperature binder grade for heavy or slow-moving traffic. Based on the success of these studies and field trials sections, two new mix types, SM-2D and SM-2E, both 50-blow Marshall mixes using PG 70-22 and PG 76-22 binders, respectively, were developed. The lower laboratory compaction effort will increase the asphalt content for durability, and the stiffer binder will prevent rutting. A large database of field rut-depth data was developed for Virginia Department of Transportation surface mixes with the asphalt pavement analyzer. The data were used to estimate maximum rut-depth criteria for quality assurance testing and the evaluation of future asphalt mix designs, binders, and stabilizers.
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