Splittkörnungen

Splittkörnungen, often translated as split grading or split control, is a technique used in concrete technology to achieve specific aggregate properties in a concrete mix. Instead of using a single aggregate size, two or more distinct aggregate sizes are employed. This allows for greater control over the particle packing, density, and workability of the fresh concrete. By carefully selecting the proportions and sizes of these "split" aggregates, engineers can optimize the void content within the aggregate structure. This, in turn, can lead to a denser concrete with reduced cement paste requirements, potentially improving strength and durability while also offering economic benefits.

The principle behind splittkörnungen is to fill the larger voids created by the coarse aggregate with a smaller, well-graded aggregate, and then fill the remaining smaller voids with even finer aggregate or sand. This creates a more continuous and densely packed skeleton of aggregate particles. Different combinations of aggregate sizes and their proportions can be used depending on the desired properties of the final concrete, such as high strength, low permeability, or specific surface texture. This method contrasts with traditional single-size aggregate grading where achieving optimal packing can be more challenging. The careful design of splittkörnungen is crucial for its successful implementation in concrete production.