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Effect of Michigan multi-axle trucks on pavement distress and profile : volume 1.
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2009-02-01
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[PDF-3.36 MB]
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Alternative Title:Volume1, Literature review and analysis of in-service pavement performance data
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Edition:Final report.
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Abstract:With the adoption of the new mechanistic-empirical pavement design method and the employment of axle load
spectra, the question of evaluating the pavement damage resulting from different axle and truck configurations has
become more relevant. In particular, the state of Michigan is unique in permitting several heavy truck axle
configurations that are composed of up to 11 axles, sometimes with as many as 8 axles within one axle group. Thus,
there is a need to identify the relative pavement fatigue damage resulting from these multiple axle trucks.
The unconfined compression cyclic load test with loading cycle that simulate different axle/truck configurations was
used to examine their relative effect on permanent deformation of an asphalt mixture. Five different axle
configurations and five different truck configurations were studied. Indirect tensile tests were used for studying
fatigue cracking of flexible pavements. The laboratory investigation indicates that the rutting damage due to
different axle configurations is approximately proportional to the number of axles, indicating that the damage per
load carried is constant for individual axles. However, the same is not necessarily true for trucks with different axle
configurations.
The fatigue life of a typical plain concrete mixture under different truck axle configurations was determined directly
from a cyclic four point beam test by using load pulses that are equivalent to the passage of an entire axle group.
Full scale slab testing was performed to study joint deterioration in jointed plain concrete pavements. The laboratory
investigation indicates that the fatigue damage due to different axle configurations increases with increasing number
of axles within an axle group for a given stress ratio. However, the results also indicate that for the multiple axles,
the damage per axle is less than the single axle for the same stress ratio. Mechanistic analysis was also carried out to
substantiate laboratory results and study specific case scenarios of loading and pavement damage.
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