ABSTRACT
This chapter discusses the methods of testing and specification applied to crushed rock aggregates, including roadbase. It is worth emphasizing that not all end-uses require the same toughness, durability and wear resistance. The most demanding applications are as road surfacing aggregate and railway ballast; somewhat lesser-quality stone is acceptable for most concrete mixes, lower-course asphalt and unbound basecourse. Relatively poor aggregate may be adequate for road subbase, backfill concrete and sub-ballast courses.
