Large Stone Hot Mix Asphalt: State of the Artby Mike Acott, Natl Asphalt Pavement Assoc, United States,
Abstract: Improved mix characteristics can be achieved by utilizing existing well-known technologies. Developments have included: more attention to voids in mineral aggregate criteria; adjusting laboratory compaction to replicate the condition of the mix on the road, after traffic; increasing design air voids to about 4%; emphasis on the use of angular shaped coarse and fine aggregate; increase in coarse aggregate content and coarse aggregate size to increase deformation resistance. The degree of change is determined by traffic conditions and past performance, and is tempered by materials availability and cost. For various reasons there has been considerable interest in the option of adding large stone to the mix. This paper concentrates on the impact of large stone addition. The main areas covered include mix characteristics, mix design, field experiences, construction and equipment.
Subject Headings: Aggregates | Rocks | Air traffic | Structural design | Construction equipment | Materials processing | Pavement design
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