Effect of Michigan multi-axle trucks on pavement distress and profile: executive summary.
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Effect of Michigan multi-axle trucks on pavement distress and profile: executive summary.

  • 2009-02-01

Filetype[PDF-231.22 KB]

  • English

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      Executive summary.
    • NTL Classification:
      NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance ; NTL-FREIGHT-Trucking Industry ;
    • Abstract:
      Truck traffic is a major factor in pavement design because truck loads are the primary cause of pavement distresses. Trucks have different axle configurations that cause different levels of pavement damage. The American Association of State Highway Transportations Officials (AASHTO) pavement design procedure only accounts for single and tandem axles used in the AASHO road test and uses extrapolation to estimate the damage due to tridem axles. Truck axle configurations and weights have significantly changed since the AASHO road study was conducted in the late 1950’s and early 1960’s. There remain concerns about the effect of newer axle configurations on pavement damage, which are unaccounted for in the AASHTO procedure. The State of Michigan is unique in permitting several heavy truck axle configurations that are composed of up to 11 axles, sometimes with up to 8 axles within one axle group. Therefore, there is a need to quantify the relative pavement damage resulting from these multiple axle trucks. The objective of this research study is to determine the effect of heavy multi-axle Michigan trucks on pavement distress by quantifying the effects of trucks with different axle configurations (single, tandem and multi-axles) on pavement damage. This was done by determining Axle Factors (AF) from laboratory and mechanistic analyses and then calculating Truck Factors (TF) using these AF and the AASHTO Load Equivalency Factors (LEF).
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