Evaluation of rutting distresses on I-20 near Mound to Delta Scales.

Details

• Creators:
  King, William ; Kabir, Sharear ; Cooper, Samuel B. ; Gaspard, Kevin
• Corporate Creators:
  Louisiana Transportation Research Center
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Interstate highways
  • Rutting
  • Pavement distress
  • Asphalt concrete pavements
  • Overlays (Pavements)
  • Stripping (Pavements)
  • Superpave
  • Moisture damage
  • Stone matrix asphalt
  • Binder course
• Publication/ Report Number:
  FHWA/LA.13/13-01TA-B
• Resource Type:
  Tech Report
• Geographical Coverage:
  Louisiana
• Corporate Publisher:
  Louisiana. Dept. of Transportation and Development
• Abstract:
  Within six months of construction, areas with excessive premature rutting were noticed on a 4.95 mile long asphaltic concrete overlay ; project on the I-20 corridor in Madison Parish, Louisiana. The scope of the project included full depth patching of the existing 8-inch ; Continuously Reinforced Concrete Pavement and providing a structural overlay with a 2-inch Stone Matrix Asphalt (SMA) layer on top ; of a 7.5-inch minimum layer of Superpave Level 2 Binder Course. Prior to this report, at the request of District 05, LTRC Asphalt ; Material Lab performed two rounds of forensic evaluation of the Stone Matrix Asphalt (SMA) surface layer of that job. From the ; preliminary investigations, the blended aggregate gradations of SMA mixture at isolated areas seemed to be the cause of the failures. ; However, since the occurrence of the initial rutting, the problem kept progressing with time and rutting was detected for almost the entire ; length of the job. Twenty one full depth asphaltic concrete roadway cores were sampled from various locations and a suite of laboratory ; tests were conducted to evaluate the mixture. Tests include various volumetric tests along with Loaded Wheel Tests (LWT) and boil tests ; to quantify the moisture susceptibility of the mixture. The SMA layer was excluded from this round of testing as that mix was already ; included in the first and second rounds. Investigation into design features revealed lift thicknesses being placed that were thinner than ; adequate for the nominal maximum aggregate size used in the mixture. Even though a small percentage of aggregate gradations and ; asphalt contents of Superpave BC mixes were found to be out of the validation tolerance limits in the latest round of evaluation, no ; correlation was noticed between materials and performance of distressed and non-distressed areas. However, field investigations, ; subsurface drainage inspection, and laboratory evaluation of mixtures demonstrated the occurrence of moisture damage in the leveling ; and binder course lifts. High Speed Profiler and FWD data were collected and evaluated in an effort to define areas of weaker pavement ; for estimating the amount of full depth patching that would be required. LTRC recommends modifying the existing drainage system to ; help eliminate the moisture from the existing pavement structure. Milling the existing surface course of each outside travel lane and ; replacing with a new HMA mixture is recommended.
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• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/27016/dot_27016_DS1.pdf
• File Type:
  [PDF - 5.90 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:c16e8c9a0a38d9b20bfd1946251adecd44f4ad3b9cf0ab39737d0ca89f6a78a1