Frost layer and gravel base layer in high quality

In times of increasingly scarce raw materials, it is increasingly important to reuse the available construction waste with maximum quality in order to obtain high-quality RCL material at the end of the process chain. When crushing rubble waste usually high fines and high levels of crushed sands are produced, which can prevent the reuse of this recycled material. Monitoring the grading curve is therefore essential to ensure consistent quality. In particular, the proportions of the smaller grain fractions should be smaller, so that the legally prescribed limits for frost layers and gravel base layers are not exceeded by the handling and compression of the RCL gravel. Only then can the requirements for water permeability and frost resistance be guaranteed even after complete use of it.

Little sand and a lot of coarse grain

The gentle crushing process produces only a minor portion of the smaller grain sizes. This gives you more coarse grains, which take on an important function for the support structure, and achieves an excellent load capacity and compressibility of the material. The largest grains are supported by the smaller grains.

The low level of sand or fine particles ensures excellent water permeability and guarantees important antifreeze properties. Depending on the feed material and processing, it may even happen that the amount of added sand have to be increased, so that the usually excess sand content from other treatment processes are utilized and do not need to be landfilled.

Concrete granules as aggregate for concrete

Due to the small proportion of fractions smaller than 2 mm, the double-roll crushing technology with special crushing tools is excellently suited for the production of aggregates for concrete. For feed grain sizes of e.g. 22/100 mm, a product grain size of less than 22 mm can be produced with a sand content of between 20% and 25%.