Many types of crushed stone: Crushed stone is not a "standard commodity." It is made by mining one of several types of rock such as limestone, granite, trap rock ...
Aggregates are inert granular materials such as sand, gravel, or crushed stone that, along with water and portland cement, are an essential ingredient in concrete.
aggregate proportions as well as cement and water requirements, workability, pumpability, economy, porosity, shrinkage, and durability of concrete.