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Gravelly soils and aggregates composed of crushed rock are commonly encountered in a variety of applications in geotechnical, transportation and infrastructure engineering projects, while gravel-sized materials, often in the form of soil mixtures, are also found in natural deposits in alluvial, glacial and shoreline environments. Despite the significant amount of research being conducted on the dynamic properties of soils, less attention has been given on the assessment and modeling of the behavior of gravel-sized materials, particularly in the range of medium strains, where stiffness and damping have a nonlinear relationship with strain amplitude. In the present study, laboratory data stemming from resonant column tests published in the literature are re-analyzed with emphasis on gravel-sized crushed rock of strong and hard grains and the range of small-to-medium strain amplitudes. The test samples had a mean …