Performance Evaluation of SP-9.5 and SP-12.5 Superpave Mixtures
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Performance Evaluation of SP-9.5 and SP-12.5 Superpave Mixtures

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    • Creators:
    • Corporate Creators:
      Texas A&M Transportation Institute
    • Corporate Contributors:
      Florida. Department of Transportation
    • Subject/TRT Terms:
    • Publication/ Report Number:
      BE928
    • Resource Type:
      Tech Report
    • Geographical Coverage:
    • Edition:
      Final Report July 2020–June 2022
    • Corporate Publisher:
      Texas A&M Transportation Institute
    • Abstract:
      Current Florida Department of Transportation specifications allow the use of Superpave (SP)-12.5/Friction Course (FC)-12.5 mixtures in heavy traffic levels (e.g., level E), but not SP-9.5/FC-9.5 mixtures. The main goal of this project is to compare the performance of SP-9.5/FC-9.5 to SP-12.5/FC-12.5 Superpave asphalt mixtures and then determine if SP-9.5/FC-12.5 mixtures are at least equivalent to SP-12.5/FC-12.5 mixtures in terms of cracking, rutting resistance, and durability. To achieve this goal, a full factorial experiment was designed and executed. This experiment includes 24 mixture designs (i.e., two gradations [SP-9.5 and SP-12.5], two aggregate types [granite and limestone], two binder grades [PG 67-22 and PG 76-22], and three design gyrations [50, 75, and 100]). For each mixture, specimens were prepared at two compaction levels (or air voids [5 percent and 7 percent]), and seven performance tests were conducted. The test results were summarized in tables and bar charts, showing their averages and standard deviations. Statistical analysis was performed based on the paired t-test to compare the performance between SP-9.5 and SP-12.5 mixtures. The results show only limestone SP-9.5 PG 67-22 mixtures have worse rutting performance than the corresponding SP-12.5 mixtures. Other SP-9.5 mixtures, such as granite (PG 67-22 or PG 76-22) and limestone (PG 76-22), show equivalent or better performance (rutting, cracking, and durability) than the corresponding SP-12.5 mixtures.
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