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Hard aggregate screed

A hard aggregate screed is a cement screed (CT) to which various aggregates such as granite, electrocorundum, quartz sand or natural stone are added as required. By adding these materials, the hard aggregate screed (also known as industrial screed) achieves a very high resistance to pressure, wear and surface abrasion. Due to these properties, the screed is mainly used in areas where the floor has to withstand high mechanical or chemical loads.

Areas of application for hard aggregate screed

Hard aggregate screed is suitable for indoor and outdoor areas where high demands are placed on the load-bearing capacity and wear resistance of the floor. Different hard aggregates are used depending on the intensity and load. The following list gives you an overview of the different areas of application and the suitable aggregates in each case:

  • - Industrial, storage and factory halls (quartz sand, corundum, metals, silicon carbide)
  • - Public buildings such as shopping centers and museums (granite or marble)
  • - Chemical and pharmaceutical industry (corundum and metal)
  • - Parking garages and underground garages (quartz and corundum)
  • - Airport hangars (corundum and metal)
  • - Port areas (metal)

Good to know: The hard materials contained in the screed are divided into three hard material groups based on their strength and abrasive wear. Group A (for general) contains materials such as natural stone and/or dense slag as well as mixtures of these with materials from groups M and KS and offers the highest abrasive wear with max. 5 cm³ / 50 cm². In the middle is group M (for metal) with max. 3 cm³ / 50 cm². Electrocorundum (K) and silicon carbide (S) from the KS group (max. 1.5 cm³ / cm²) have the lowest wear and are therefore best suited as an aggregate for very heavily stressed areas.

Laying types of hard aggregate screed

Depending on individual requirements, the hard aggregate screed is laid in a single layer in a bond or in two layers on a separating or insulating layer. With the single-layer installation method, the cement screed is mixed directly with the hard materials and applied to the floor below without an additional separating or insulating layer. This creates a firm bond between the substrate and screed, which increases its stability and load-bearing capacity. To ensure good adhesion of the screed, a bonding bridge can be applied to the substrate before laying.

With two-layer installation, a layer of cement screed is first applied to the substrate. A separating or insulating layer is then applied as required. Finally, the top layer of screed mortar and hard materials is applied. Sprinkling is a special variant. Here, the hard aggregates are sprinkled onto the surface of the still damp base screed and applied manually. This type of installation has the advantage that the surface of the hard aggregate screed is even more durable and wear-resistant, but also involves more work and is therefore more expensive than single-layer installation.

By the way: The requirements that hard aggregate screed must meet are regulated in DIN 18560-1.

The advantages of hard aggregate screed at a glance:

  1. - High load capacity
  2. - Uncomplicated care
  3. - Increased sliding safety
  4. - abrasion-resistant and wear-resistant
  5. - Particularly high flatness
  6. - Time-efficient installation
  7. - High durability
  8. - Variable optics

Arrange a consultation now

Our employees have many years of experience in concrete and screed processing.

Would you like to find out more about the numerous advantages of hard aggregate screed? Then make an appointment now for a no-obligation consultation. We will find out whether hard aggregate screed is the best choice for your needs or whether other screeds are more suitable. If you decide on the special cement screed, we will be happy to assist you with our experience from over 25 years of laying screed and support you professionally and reliably - from the initial consultation to the completion of your project.