The key components of cold recycling

Milling and mixing rotor

Cold recyclers granulate the existing pavement material by means of a robust milling and mixing rotor. The rotor is equipped with highly wear-resistant point-attack cutting tools which rotate in special quick-change toolholders. Toolholders and cutting tools are arranged on the rotor in an elevated position, ensuring that the construction material is thoroughly mixed with the binding agents

The engine power is transmitted to the milling and mixing rotor via a direct mechanical belt drive, ensuring maximum efficiency. The design of the cold recycler’s drive system with belt pulleys and power belt allows four different rotor speeds to be selected, depending on the intended application.

Mixer

The large cold recycler WR 4200 and the mobile mixing plant KMA 200 produce cold mix in a twin-shaft compulsory mixer. The mixer blends the milled material with water and binding agents to produce a homogeneous mix. The mixing arms and mixing blades, as well as the interior lining are made from highly wear-resistant material.

Decompaction increases the volume of the existing soil, with the decompaction factor strongly depending on the condition of the in-situ material.

Injection system for binding agents

The binding agents (cement slurry, bitumen emulsion or foamed bitumen) and water are injected into the cold recycler’s mixing chamber via injection bars. These injections bars with pumps and nozzles are precisely adapted to the different types of agents to be added. Metering of the quantities to be added is precisely governed by microprocessor units.

Paving screed

The track-mounted recyclers are capable of placing the recycled mix immediately. A spreading auger distributes the mix evenly across the full working width, followed by the paving screed which compacts the recycled pavement material to produce a compact layer.