United States Department of Transportation
i
Feasibility and Performance of Low-Volume Roadway Mixture Design
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2022-04-01
[PDF-1.81 MB]
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Edition:Final Report8, /2019 – 11/2021
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Abstract:The typical low-volume project in Louisiana is mill and replace (~2 in.) with no base repair. The less than ideal base conditions often lead to density variations in the asphalt wearing course. The 2016 Louisiana Department of Transportation and Development specification based pay for asphalt tonnage on density under a percent within limits (PWL) pay structure. In an effort to provide Louisiana contractors with a more efficient hot mix asphalt (HMA) mix design for low-volume roadways, the Louisiana Department of Transportation and Development (DOTD) introduced criteria for roads with average daily traffic (ADT) under 1000. One way to accomplish this was to introduce a new set of criteria that would yield a mix that could achieve a passing density with less effort; this would not unjustly penalize contractors for density variation on low-volume projects with varying base conditions. In addition to the revised asphalt mixture criteria, the specifications introduced a revised payment adjustment schedule that is based on the average roadway density of the asphalt lot rather than the PWL pay schedule. With the implementation of the low-volume roadway mix design criteria and the revised payment adjustment schedule, DOTD proposes to evaluate the performance of these asphalt pavements and evaluate the effect that the new payment adjustment schedule may have on the performance.
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