The technology of the®-process

The technology of the®-process carried out in accordance with DIN 18506, ZTV considered T-StB (FGSV-999) and is based on physico-chemical reactions.

Physical reaction

Electron micrographs of the compressed material show, that the use of the specific binding agent with a particle size range from 0 to 90 µm larger pores completely disappear in the ground material, and thus a very high degree of consolidation is achieved.

Chemical reaction

Due to the basic properties of the binder, the surfaces of the solidified soil minerals are dissolved and activated. This makes it possible that the minerals contained in the soil form new and stable aggregates.

Adding water

The addition of water is used to produce an optimum Proctor density.


The additive (project depends partly also a catalyst) serves only to accelerate the mineral formations and is included in the respective binder. By using the special binder in the®-process on the building site, the addition of the catalyst carried out, if appropriate, on site.

What types of soil can be used?

With regard to their mineral composition all types of soil for use of®-process are basically suitable. According to the existing natural water content of the soil, the respective mixing ratio must be analyzed and determined in the laboratory. Even with the existing grain size there is no limit. They range from fine-grained clay up to gravel. Depending on the particle size only the technique has to be defined.

What are the environmental implications of the®-process?

In Germany the environmental impact of the®-process was examined by a publicly appointed and sworn expert. The report confirms the safety and compliance of the test values for the pathway soil-groundwater according to the Federal Soil Protection Ordinance. Project-specific suitability tests are carried out basically before use.

What are the criteria for quality control?

The criteria are subject to the general principles of the construction industry. Essentially the 1-axial compressive strength of test specimens and the deformation modulus are tested on the object. The deformation modulus involves measuring the reduction of incremental load to a defined area, discharge and reloading [MN/m²]. For the criteria base and base course the respective limits are prescribed. The environmental impacts will be assessed according to the requirements of the Federal Soil Protection Ordinance.

How is the rate (the percentage) determined?


The dosage is determined by the existing natural water content and varies depending on the type of soil between 0.5 to 4 % by mass binder content.

Base course

Considering the found water content is in accordance with the stability – see parking pads, foundation surfaces and roads of various load classes – the binder content is set to 2 to 5% by mass.

What influence does the material on the asphalt or cement?

The®-process exerts no influence on the tarmac. By using the®-process there are no chemical or physical soil reactions between asphalt and the solidified underground. The same applies to the applied cement or other surfaces.

Can the solidified soil be used as a road without asphalt?

The production of such, “ecological road” called surface, is a primary goal when using the®-process, because by saving on asphalt or cement a very good price-performance ratio is achieved. In Germany “ecological roads” have been prepared as forest roads, which have even in heavy traffic (10 years at freeze-thaw-change) a long durability.

Which cost structures can be planned?

By using a relatively cheap available binder, the cost structure is clearly more favorable as in the use of cement or quicklime material, especially roads without asphalt and cement pad can be produced (“ecological roads”). Currently only the transport distances limit the field of application for the whole of Europe. It has been demonstrated, that the built of test tracks under real conditions, with a relatively large complexity in the coordination of the individual companies and not trained staff, costs of around € 6.00 – € 10.00 per square meter incurred.

By realizing a professional coordination and employing specialized staff, so the costs can be significantly reduced. If the process is considered as part of immobilization compared to disposal, there is no economic alternative.