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

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  • Creators:
  • Corporate Creators:
    Louisiana Transportation Research Center
  • Corporate Contributors:
    United States. Federal Highway Administration
  • Subject/TRT Terms:
  • 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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