United States Department of Transportation
i
I-10 pavement distress : Ramah-Westover, east & west sections : technical assistance report.
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1995-03-01
[PDF-129.87 KB]
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Alternative Title:I-10 pavement distress : Ramah-Westover, east & west sections.
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Abstract:A fourteen mile, 6.5-8.0 inch asphalt concrete overlay of continuously reinforced concrete pavement demonstrated delamination, leaching, and rutting distress prior to acceptance in June 1989. Twentysix areas ranging from 20-1000 feet were either partially or full depth removed and replaced. An extensive field and laboratory investigation was conducted to determine the cause of the distress. Full depth asphalt concrete overlay roadway cores were sampled at sites designated as either moisture damaged or rutted along with samples at non-distressed areas. Observations during this evaluation detected moisture damage within each of the lifts placed. Each core was returned to the laboratory where individual lifts were separated and the asphalt extracted. Asphalt content and gradations were determined. Materials were sampled from the contractor's plant and were tested for moisture susceptibility in the Louisiana boil test, modified Lottman test and Texas pedestal test. Rut depths were determined for the entire project in 1989 and 1994 at 0.25 mile intervals in the outside wheelpath of the outside lane . Three trenches were cut across the outside lane in 1994 to determine the origin of the rutting problem. The moisture susceptibility testing demonstrated that each of the individual materials was moisture susceptible by either the boil test or pedestal test. Modified Lottman tests indicated that the overall mixtures were also susceptible. The rutting was found to initiate in the wearing course mix. An analysis of the mix design found that the gradation approved for use met specifications but provided the maximum packing capacity leaving minimum void space. The asphalt content approved for use was found to be from 0.2 - 0.5 percent higher than optimum as determined by standard practice. The combination of minimum void space in the aggregate structure and excess asphalt provided the opportunity for permanent deformation. Recommendations are provided for revisions to the department's mix design procedures and guidelines for gradation and voids analysis.
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