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“Fluidised soil” is increasingly important, not least as a result of new developments and progress in machine technology.

The 3‑mtbc starscreen from Backers is used for 3 fraction screening.

Retrofitted with a container for binder, the 3‑mtbc starscreen can be used as a screening and mixing machine and to produce fluidised soil. Water is added to the concrete mixer in measured quantities when the machine is filled. For sticky and clayey soils, screening at 60 mm is recommended.

The new 3‑mtcf starscreen can add water to the mixture of soil and compound in measured quantities and then mix them in the flow mixer. The system can therefore produce fluidised soil at up to 150 t/h.



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A smaller version can also be used for screening and to produce fluidised soil. The concept consists of a 2-hma starscreen and a loader with quick coupler, bucket and rotor mixer. All the machines can be transported using a hook lift truck with trailer.

The workflow for producing fluidised soil can be completed on site as follows:

The telescopic loader loads the hopper from the starscreen using a batch excavator. Depending on how cohesive the soil is, screening is done at 60, 50, 40, 30, 20 or 10 mm. The rotor mixer is then attached. The rotor mixer is filled with a corresponding quantity of water and placed in front of the starscreen’s fine-grain discharge belt. The binder is also weighed per batch and conveyed into the rotor mixer with the excavated material by the fine-grain belt.

The mixing intensity of the rotor mixer is excellent, so that the fluidised soil is mixed well after a short time. The fluidised soil can be cast quickly on site using the loader.

he result is a cost-effective, mobile solution. It is easy to operate accurately and in compliance with documentation requirements.

Rapid, correct installation of fluidised soil can be checked on site under optimal conditions.

A loader with e.g. 5 tonne lifting force in conjunction with one rotor mixer can mix up to 3 tonnes in a single batch.

A single person can produce and cast the fluidised soil. A higher daily production rate can be achieved by using a second wheeled loader (or bucket excavator). The daily production rate can be increased further with this system by using multiple loaders with the rotor mixer.