Fatigue of bituminous mixtures |
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Authors: | H Di Benedetto C de La Roche H Baaj A Pronk R Lundström |
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Affiliation: | (1) Mechanical Engineering Department, Advanced Composites Research Laboratory, Wayne State University, Detroit, MI, 48202;(2) Mechanical Engineering Department, University of Nevada-Reno, MS312, Reno, Nevada, USA |
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Abstract: | This paper presents an interlaboratory test campaign organized by the RILEM 182-PEB Technical Committee. In the campaign,
11 different test methods, comprising uniaxial tension/compression, 2-, 3- and 4-point bending and indirecttension tests,
were utilized in order to investigate fatigue characteristics of a dense graded asphalt concrete mixture. The testing conditions
specified were sinusoidal excitation at 10Hz and 10°C using controlled strain and stress modes. In total, more than 150 fatigue
tests were carried out during the investigation. The fatigue test results were analyzed using both classical as well as continuum
damage mechanics approaches. The fatigue test results obtained using the classical fatigue approach are considerably influenced
by test type and mode of loading (controlled stress or strain) used. Consequently, this approach has limited use in realistic
fatigue characterization of bituminous materials and pavement structures. In contrast to the classical approach, models founded
on continuum damage theory may serve to isolate intrinsic fatigue characteristics from the influence of so-called biased effects,
which are largely caused by the accelerated laboratory testing. The continuum damage models investigated may constitute steps,
towards a rational mechanistic fatigue characterization model, which are important for effective future pavement design. |
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