Aggregate Definitions


Coarse Aggregate:   Aggregates held on the #4 (4.76 mm) sieve.
Fine Aggregate: Aggregates that pass the #4 (4.76 mm) sieve and are retained on the #200 (74 micron) sieve.
Gravel: Granular material resulting from abrasion and natural disintegration of rock that is predominately held on the #4 (4.76 mm) sieve.
Sand: Granular material resulting from abrasion and natural disintegration of rock that almost entirely passes the #4 (4.76 mm) sieve.
Bank Gravel: Gravel found in natural deposits, usually more or less intermized with fine material, such as sand or clay, or combinations thereof; gravelly savd, clayey gravel, and sandy gravel indicate the varying proportions of the materials in the mixture.
* Definition from ASTM D8
Crushed Gravel: The result of artificially crushing of gravel; almost all fragments have at least one face that resulted from fracture.
Crushed Stone: The result of artifically crushing rocks and boulders; almost all faces result from the crushing operation.
Crushed Rock: The result of artifically crushing all rock; all faces result from blasting or the crushing operation.
Blast-Furnace Slag:   The nonmetallic product (composed mainly of silicates and alumino-silicates of lime and other bases) that is formed in a molten state simultaneously with iron in a blast furnace.