gruset

Gruset is the definite form of the noun grus in Swedish and Norwegian, referring to gravel—a granular construction material made of rock fragments. It typically consists of particles ranging from about 2 to 64 millimeters in size and is used as an aggregate in various civil engineering applications. Grus can be natural, formed by river or shore processes, or produced as crushed gravel by breaking larger rock and sorting the fragments.

Size classification and standards vary by region, but common fractions include components such as 4–8 mm, 8–16 mm, 16–32 mm, and 32–64 mm. Washed grus has a reduced fines content and improved cleanliness, which benefits concrete work, drainage, and durability. Natural gravels tend to have more rounded particles, while crushed gravels are more angular and interlock better, affecting compaction and load-bearing characteristics.

Common uses of gruset include as aggregate in concrete and asphalt, as a base or sub-base layer in road and driveway construction, as ballast for railway tracks, and in drainage systems and landscaping. The performance of gruset depends on particle size distribution, shape, density, and mineral content. Cleanliness (low clay content) and appropriate grading are important for achieving desired strength, permeability, and long-term durability.

Extraction and processing of gruset can have environmental impacts, including habitat disturbance and groundwater effects. Reuse of recycled concrete aggregates and careful site management help mitigate these impacts.