Performance evaluation of Louisiana superpave mixtures.

Details

• Creators:
  Mohammad, Louay N. ; Wu, Zhong ; Raghavendra, Amar
• Corporate Contributors:
  Louisiana Transportation Research Center ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Superpave
  • Pavement performance
• Publication/ Report Number:
  FHWA/LA.06/410
• Resource Type:
  Tech Report
• Geographical Coverage:
  Louisiana
• Corporate Publisher:
  Louisiana Transportation Research Center
• Abstract:
  This report documents the performance of Louisiana Superpave mixtures through laboratory mechanistic tests, mixture ; volumetric properties, gradation analysis, and early field performance. Thirty Superpave mixtures were evaluated in this ; study. Fourteen of them were designed for high volume traffic (> 30 million ESALs), twelve for intermediate-volume ; traffic (between 3 and 30 million ESALs), and four for low volume traffic (< 3 million ESALs). Four aggregate types: ; limestone, sandstone, novaculite, and granite and five binder types: AC-30, PAC-30, PAC-40, PG 70-22M, and PG 76- ; 22M were included in the mixtures. Four MTS tests: the indirect tensile (IT) strength, IT resilient modulus, IT creep, ; and axial creep, three Superpave Shear Tester (SST) tests: frequency sweep at constant height (FSCH), repeated shear at ; constant height (RSCH), and simple shear at constant height (SSCH), and the Asphalt Pavement Analyzer (APA) rut test ; were included in the testing program of this study. ; The test results showed that high volume mixtures appeared to have higher IT strengths, lower IT and axial creep slopes, ; and higher shear stiffnesses when compared to those of low volume mixtures. This indicates that high volume mixtures ; generally possessed better rut resistance than the low volume mixtures considered. The compaction efforts (the N-design ; levels), dust/AC ratio, film thickness, and the percent of aggregate passing the 0.075 mm sieve were observed to have ; certain relations with the rut susceptibility of Superpave mixtures. The Power-law gradation analysis indicated that all ; four Power-law gradation parameters (aCA, nCA, aFA, and nFA) were sensitive to the mixture mechanistic properties ; evaluated. This implies that the proposed Power-law gradation analysis could be used as the bridge between aggregate ; gradation design and mixture performance evaluation. Finally, the early field performance of those Superpave mixtures ; was studied and compared to their laboratory performance test results.
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• Format:
  PDF
• Alternate URL:
  http://www.ltrc.lsu.edu/pdf/2016/FR_410.pdf
• Funding:
  98-1B ; work unit no. 736-99-0537
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/30793/dot_30793_DS1.pdf
• File Type:
  [PDF - 837.76 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:c2c6e4298ae36aedbb7a8bbb43067c27c6383ed2c75229d01ca0b17ba8ee9e1b