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Approved for public release; distribution is unlimited. Abstract:The Vermont Agency of Transportation (VAOT) conducted a two-phase study to quantify the resilient modulus and strength characteristics of its subbase material. In Phase 1, a literature review was done to determine the various methods available for indexing the shape, texture, and angularity of coarse aggregates. In the second phase, described in this report, a study was conducted to relate particle index to the mechanical resilient and shear properties of base course materials. The particle index as modified by the Michigan Department of Transportation used the complete gradation and was a good indicator of the crushed (angular) content of a given base course gradation. The particle index test also may be used to indicate resilient and shear properties of base course aggregate gradation.

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