(Colour is generally blue-grey, but is subject to variation)
Cobbles are our largest screened material. As can be seen in the photo opposite, there is a large variation in the size of the rocks.
Typically the material is 100% passing the 150mm sieve, with 0% passing the 37.5mm sieve
Construction aggregate, or simply aggregate, is a broad category of coarse- to medium-grained particulate material used in construction, including sand, gravel, crushed stone, slag, recycled concrete and geosynthetic aggregates. Aggregates are the most mined materials in the world.
