Natural Aggregates: Aggregates originated from stone quarries, gravel, sand or igneous/ metamorphic rock deposits.
Slag Aggregates: By-products formed in the production of iron, copper, and steel.
Iron Blast Furnace Slag: A synthetic nonmetallic by-product simultaneously produced with pig iron in a blast furnace that primarily consists of a fused mixture of oxides of silica, alumina, calcium, and magnesia.
Reverberator Furnace Slag: A non-metallic by-product of refined copper ore.
Steel Furnace Slag: A synthetic by-product of basic oxygen, electric or open-hearth steel furnaces that primarily consists of a fused mixture of oxides of calcium, silica, iron, alumina, and magnesia.
Crushed Concrete Aggregate: Crushed portland cement concrete.
Salvaged Aggregate: Dense-graded aggregate saved or manufactured from Department project sources that may consist of natural aggregate, blast furnace slag, crushed concrete, or reclaimed asphalt pavement with particle sizes no greater than 2 inches and no visible organic or foreign matter.
Manufactured Fine Aggregate: One hundred percent crushed rock, gravel, iron blast furnace slag, reverberatory furnace slag, steel furnace slag, or portland cement concrete.
Natural Sand 2NS and 2MS: Fine, clean, hard, durable, uncoated particles of sand free from clay lumps, and soft or flaky granular material resulting from the natural disintegration of rock, and used in concrete mixtures, mortar mixtures, and intrusion grout for pre-placed aggregate concrete.
Stone Sand 2SS: Sand manufactured from stone sources. These stone sources must meet the physical requirements for coarse aggregate 6A prior to crushing. The Engineer will only allow stone sand in concrete base course or structural concrete not exposed to vehicular traffic.
Soft Particles: Structurally weak particles or particles experiencing environmental deterioration, including shale, siltstone, friable sandstone, ochre, coal, and clay-ironstone.
Crushed Particles: Particles with at least one fractured face. The contract will specify the number of fractured faces based on required use. Unless otherwise specified, one fractured face is considered a crushed particle.
Base Fineness Modulus: The average fineness modulus typical of the source for a specific fine aggregate.
Cobblestones (Cobbles): Rock fragments, usually rounded or semi-rounded, with an average dimension between 3 inches and 10 inches.