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Experiments were conducted to study the creep behavior of compacted recycled asphalt pavement (RAP), which is a backfill material that can be beneficially re-used in the construction of embankments and retaining structures. A series of constant stress, drained triaxial tests was performed on 100-mm diameter, compacted RAP specimens to assess its response under sustained shear stress. The test data displayed classic creep behavior, with clearly identifiable primary and secondary creep observed in all specimens. Tertiary creep and creep rupture were observed in specimens tested at shear stress ratios greater than 0.64. Fitting the RAP experimental data to a creep model developed for soils indicates that RAP displays creep behavior similar to clays. Models that predict the time to creep rupture were also successfully fit to the experimental data and showed that the time to creep rupture decreased with increasing shear stress ratio. In general, the creep potential of RAP is significant and should be considered in design. The developed creep models can be used to predict the time dependent deformation of projects utilizing RAP backfill.
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