Continued Monitoring of Indiana's SPS9-A Site

Details

• Creators:
  Shah, Ayesha ; McDaniel, Rebecca S. ; Olek, Jan
• Corporate Creators:
  Purdue University. Joint Transportation Research Program
• Corporate Contributors:
  Indiana Department of Transportation ; United States. Federal Highway Administration
• Subject/TRT Terms:
  Binders Concrete Pavements Cracking Of Concrete Pavements Long-term Performance Pavement Cracking Pavement Monitoring Pavements RAP Section Recovered Binders SPS9-A Testing Transverse Cracking

  More +
• Publication/ Report Number:
  FHWA/IN/JTRP-2012/19
• Resource Type:
  Research Paper
• Geographical Coverage:
  Indiana
• Edition:
  Final report.
• Corporate Publisher:
  Purdue University. Joint Transportation Research Program
• Abstract:
  This study was initiated to continue monitoring the performance of five test sections placed in 1997 to compare the performance of
  
  Superpave asphalt mixtures with different binder grades and one test section designed using the Marshall mix design method. A
  
  previous study had evaluated the performance of these test sections for four years after construction. This study extended that
  
  evaluation period to 12 years. During that time period, cores were taken from each test section at 9.5 and 12 years in service. Cores
  
  were tested and analyzed to determine the volumetrics and low temperature cracking behavior of the mixtures. Additional cores were
  
  used to extract, recover and test the binder in the mixtures. Results showed that the air void content in the mixtures did continue to
  
  decrease up to about nine years then appears to have leveled off. Aging (stiffening) of the unmodified binders was observed through
  
  Dynamic Shear Rheometer testing of the recovered binders but not by the penetration test. The modified binder did not exhibit the
  
  same level of aging as the unmodified binders. Aging also affected the recovered low temperature binder grade of four of the six
  
  binders, but the other two seemed relatively insensitive to aging at low temperatures. Testing of field cores showed that all of the
  
  mixtures would be expected to show thermal cracking at 9.5 years and beyond; this was confirmed by field distress surveys. The mix
  
  with polymer modified binder showed the greatest amount of cracking, which began at an early age in the field; this was not expected
  
  and did not correlate well with the lab testing results for unknown reasons. The mix with 15% RAP was slightly stiffer than a companion
  
  control mix without RAP, but the difference in predicted cracking temperature was only 1 ‐ 2°C for the surface mixes. Based on these
  
  results, INDOT can continue to use Superpave mixes with confidence, especially when considering the fact that Superpave has continued
  
  to evolve and be refined since this project was constructed. The mixture with RAP has performed about as well as the virgin mixtures
  
  under heavy interstate traffic.
  
  
• Format:
  PDF
• Funding:
  SPR-3017
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:ac06b8b3219275bae505e24eb1a2a07d2be02348e4aa68a98a93ffa494f075d2
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/25214/dot_25214_DS1.pdf
• File Type:
  [PDF - 8.61 MB ]