Durable superpave mixes in Kansas.

Details

• Creators:
  Ahmed, Ananna ; Aziz, Syeda R. ; Sabahfar, Nassim ; Hossain, Mustaque
• Corporate Creators:
  Kansas State University. Transportation Center
• Corporate Contributors:
  Kansas. Dept. of Transportation. Bureau of Research
• Subject/TRT Terms:
  • Superpave
  • Pavement performance
• Publication/ Report Number:
  K-TRAN: KSU-12-4
• Resource Type:
  Tech Report
• Geographical Coverage:
  Kansas
• Corporate Publisher:
  Kansas. Dept. of Transportation. Bureau of Research
• Abstract:
  Approximately 89% of 11,000 miles of Kansas roads are surfaced with asphalt. Hundreds of thousands of tons ; of reclaimed asphalt pavement (RAP) are produced annually in the United States, including in Kansas. This bulk ; volume of RAP must be economically managed in order to achieve environmental friendliness. Recycling of RAP ; conserves natural resources and reduces landfill usage. However, many agencies have reported that increased RAP ; content produces drier hot-mix asphalt (HMA) mixtures than virgin mixtures that are susceptible to premature ; cracking. ; In this research, laboratory-produced Superpave HMA mixtures containing increased percentages (20, 30, and ; 40%) of RAP materials from three RAP sources (Shilling Construction Co., Konza Construction Co., and the Kansas ; Department of Transportation project, US-73) were studied for cracking performance. Mix designs were produced ; using Superpave design criteria for 12.5-mm nominal maximum aggregate size mixture. The static and repetitive ; Semicircular Bending (SCB) test, the Texas Overlay Tester test, the dynamic modulus test, and Simplified Viscoelastic ; Continuum Damage (S-VECD) tests were performed on laboratory-prepared samples. In general, cracking ; performance decreased with increased RAP content. The RAP from the US-73 project performed most consistently ; compared to other two sources of RAP. Test results were analyzed using two-way Analysis of Variance (ANOVA), ; proving that mixtures containing 4.5% to 4.9% binder performed the best against cracking. The RAP source was found ; to have more effect on cracking propensity than RAP content. Mixtures with RAP content up to 40% performed ; satisfactorily. Tukey’s pairwise comparison method was used to compare results from all tests; S-VECD was ; determined to be the most appropriate test to evaluate cracking propensity of HMA mixtures.
  More +
• Format:
  PDF
• Funding:
  C1918
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/30784/dot_30784_DS1.pdf
• File Type:
  [PDF - 2.85 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:ae03f3266c225765107b537d0027647ea18c5ba8c0cef261bb45368792d2eb11e360e65f8f3b8a9ebe9e104707721b6146cf119cb519082fcd8647f51b2ae952