Aggregates For Concrete
Aggregates—sand, gravel, crushed stone, and air-cooled blast-furnace slag—produce freshly mixed normal-weight concrete with a density (unit weight) of to kg/m. 3 (140 to 150 lb/ft. 3). aggregates of expanded shale, clay, slate, and slag (fig. 5-3) are used to produce struc-tural lightweight concrete with a freshly mixed.