United States Department of Transportation
i
Performance Evaluation of Fine Graded Superpave Mixtures for Surface Courses
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2001-08-01
[PDF-422.92 KB]
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Edition:Final Report
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Abstract:SHRP A407 recommends that aggregate gradations pass below the restricted zone as traffic level increases. The aggregate gradation curve of most of the SUPERPAVE mixes used today, especially in the Southeast region of the U.S., follows a typical "S" shape with fines lying slightly below the restricted zone. Such a gradation yields a relatively coarse mix; however, the use of gradation with fines slightly above the restricted zone is technically acceptable according to SHRP specifications. Since such a mix is similar to the I-I or I-2 surface mixture used by the NCDOT for surfacing of the secondary roads, it will be more economical as well as more amenable to acceptance by field engineers. The use of natural sand will reduce the build up of fines in the stone quarries and encourage the use of reclaimed asphalt pavement (RAP) material. This study investigated the use of natural sand in the fine and coarse gradations for the surface course mixtures. The mixtures were designed using the SUPERPAVE mix design approach and were evaluated for their performance in terms of resistance to rutting, fatigue, and moisture damage. In addition, the accelerated performance of these mixtures was also evaluated using the Asphalt Pavement Analyzer (APA).
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