Compacting mineral concrete - what do you have to pay attention to?

Mineral concrete is a mixture of different minerals and contains no cement as binder. Compacting mineral concrete therefore has a different impact on the material than conventional concrete. What to look out for, you can read here.

Cavity compaction in mineral concrete

The only binder used in mineral concrete is water, not cement, as is the case with conventional concrete. The individual substances of the bulk material are often different in size, and broken grain is common. Due to the different sized grains arise cavities.

If a vibrating plate is used, the individual grains are pushed into each other, the cavities shrink thereby. Therefore one speaks of the mineral concrete of a cavity compaction. The effects of compaction can not be calculated exactly but can only be estimated. With very different grain sizes and very small grains in the bulk material, the effect is stronger than with bulk material with large or at least equal sized grains.

Compaction, volume and weight

The compaction also reduces the volume that the mineral concrete fills. At the same time, the weight increases as the density of the material increases. This is due to the different composition compared to conventional concrete.

This is important at:

  • Substrates with limited load-bearing capacity
  • a certain intended height of the construction of mineral concrete and
  • in estimating the required amount

How much bulk material (in m³) is required depends on the degree of subsequent compaction. In most cases, you have to estimate here, an exact calculation is not possible. Also, the weight of the mineral concrete substructure - such as roads or roads - can only be roughly estimated, for the most common varieties, however, there are quite reliable experience.

It is also important to keep in mind how many times it is compressed - two to three times the rule is in most cases.

Tips & Tricks

When using a manufacturer's weight calculator, keep in mind that weight refers only to loose bulk. By compacting the bulk material, the density and thus the weight can rise very significantly, thus overloading the load bearing capacity of the substrate. It is best to rely on the estimates of a professional.

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