1. Stone-on-stone contact of permeable friction course mixtures
- Author
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Alvarez, Allex E., Mahmoud, Enad, Martin, Amy Epps, Masad, Eyad, and Estakhri, Cindy
- Subjects
Asphalt concrete -- Analysis ,Pavements, Asphalt -- Mechanical properties ,Engineering and manufacturing industries ,Science and technology - Abstract
Stone-on-stone contact of the coarse-aggregate fraction is one of the main characteristics of permeable friction course (PFC) asphalt mixtures that is required to provide adequate resistance to both raveling and permanent deformation. Currently, stone-on-stone contact is determined by comparing the air voids content in the coarse aggregate (VCA), assessed in both the dry-rodded condition ([VCA.sub.DRC]) and the compacted PFC mixture ([VCA.sub.mix]). The underlying assumption is that the coarse aggregate of a compacted PFC mixture with [VCA.sub.mix] equal to [VCA.sub.DRC] would develop a stone-on-stone contact condition equivalent to that existing in the dry-rodded aggregate. This study focused on proposing enhancements for the quantitative determination of stone-on-stone contact of PFC mixtures. The assessment supported on both laboratory testing and application of the discrete element method and image analysis techniques, led to recommendation of a criterion to determine the breaking-sieve size. In addition, verification of stone-on-stone contact using a maximum VCA ratio of 0.9 was recommended to ensure the design and construction of PFC mixtures with fully developed stone-on- stone contact. DOI: 10.1061/(ASCE)MT.1943-5533.0000117 CE Database subject headings: Asphalt pavements; Porous media; Aggregates; Mixtures. Author keywords: Asphalt pavements; Porous pavements; Asphalts; Aggregates.
- Published
- 2010