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

Details

• Creators:
  Hu, Sheng ; Zhou, Fujie
• Corporate Creators:
  Texas A&M Transportation Institute
• Corporate Contributors:
  Florida. Department of Transportation
• Subject/TRT Terms:
  Anti-strip Agents Asphalt Mixtures Cracking Pavement Performance Rutting Superpave Asphalt Mixture Stability
• Publication/ Report Number:
  BE928
• Resource Type:
  Tech Report
• Geographical Coverage:
  Texas;United States;Florida
• 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.
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:ae0ef29a1a6d7e158b11e34f7ecdb5456d1375629f92286c5794b575168fcbe1ad1fbf583566c49726d315d52eecd2ff0da1868736aa7db733e9d7800a5fc9a0
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/70387/dot_70387_DS1.pdf
• File Type:
  [PDF - 9.73 MB ]