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The Indiana Department of Transportation prompted by major concerns in 1987 over permanent deformation (rutting) decided to increase the level of one face fractured gravel coarse aggregate particles in asphalt mixtures. Previous levels of 40% for base course, 55% for binder course and 70% for surface were essentially increased to 95% for all mixtures used in higher traffic volume work. This paper subsequently addresses two questions: 1. Is it always necessary to increase gravel fracture percentage to offset rutting and if so, what level is appropriate? 2. Since both stone and gravel asphalt pavements in Indiana have experienced rutting, what other mixture properties and/or construction techniques influence rutting potential?
rutting, permanent deformation, gravel, fractured gravel, crushed gravel, sand angularity, fines, hot mix asphalt, marshall properties
Director of Technical Services, Vulcan Materials Company's Midwest Division, Chicago, Illinois
Manager of Technical Services, Vulcan Materials Company's Southwest Division, San Antonio, Texas