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Road recycling: concrete breaking and asphalt milling

A FAE MTM/HP multitask has been recently used on two construction sites at an altitude of 800 m in the Swabian Alb, a mountainous region between Stuttgart and Ulm

The FAE MTMHP multitask

  Per la versione in Italiano: https://www.stradeeautostrade.it/macchine-stradali/riciclaggio-stradale-la-frantumazione-di-calcestruzzo-e-la-fresatura-di-asfalto/

Germany has a widespread, well-maintained road network. The Federal Agency of the German Ministry of Transport and the local municipalities invest large amounts of public funds every year to keep this national heritage, made up of different types of roads, in perfect condition.

The Bundesstraßen or federal highways, the Landesstraßen or state roads, the Kreisstraßen or county roads, and the Gemeindestraßen or municipal roads. It goes without saying that a number of private companies in the business of road maintenance have also emerged.

One of these is Franz Blum GmbH Tief- und Straßenbau, based in Ittenhausen, in Baden-Württemberg. The company has 35 employees and an FAE MTM/HP multitask (https://www.fae-group.com/en/products/construction/co-pto-driven-heads/multitasks/mtm-mtm-hp?_locale=en), which it recently used on two construction sites at an altitude of 800 m in the Swabian Alb, a mountainous region between Stuttgart and Ulm.

On both construction sites, the use of a multitask, capable of taking on multiple jobs – in this case, stabilizing the soil and milling or breaking asphalt and concrete – proved crucial.

Recycling concrete

“On the first site, we had to recycle a municipal road made of 16 cm thick plain concrete and break it on site” – recounts Lothar Blum, the company’s owner.

“The road had a lot of wear and tear, with potholes and subsidence that made for difficult driving. We had to break the existing concrete, stabilize the resulting material, and prepare it for the new asphalt surface.

A working FAE MTM-HP in Germany
1. A FAE MTM/HP multitask has been recently used on two construction sites at an altitude of 800 m in the Swabian Alb, a mountainous region between Stuttgart and Ulm

Because the concrete road was 16-cm thick, it was necessary to loosen the concrete surface in advance using an excavator chisel in a grid of approx. 40×40 cm.

Afterwards, the MTM milling machine was able to break up the concrete and crush it into a grit size of 0/60 mm. We milled 1,500 square meters of concrete in all. We paired the FAE MTM/HP with our Fendt 936 tractor, a very powerful duo that allowed us to complete the job within the time allotted”.

Asphalt recycling

On a second nearby job site, Franz Blum GmbH Tief- und Straßenbau took care of the cold recycling of the asphalt surface from a municipal road. “In this case, we were tasked with recycling 1,600 square meters of asphalt (approx. 10 cm thick) on site” – Mr. Blum went on to say.

“Again, we worked with the MTM/HP attached to the Fendt 936 tractor to 40 cm deep, at an operating speed of 0.2 to 0.6 km/h. The grit size of the processed material was approximately 0/60 mm. Here too, we were very happy with the work. Overall, or experience with the FAE MTM was positive for both job sites”.

Recycling in road construction

Recycling in road construction – which is often mandated by various national regulations – generally has numerous advantages.

The first is being able to immediately recycle the material obtained from milling the old road surface and use it to produce the new surface, all without the additional costs associated with conventional construction and by applying a method with significantly lower environmental impact.

The benefits therefore range from saving time and money to a more environmentally-friendly project.
Just consider that the conventional method involves removing the old road surface, transporting it to the landfill and disposing of it or treating it at a special facility, then purchasing the new material and transporting it from the quarry to the job site.

A FAE MTM-HP from the front
2. A FAE MTM-HP from the front

Overall, recycling old concrete or asphalt on site can save up to 400%. FAE’s multitask machines make recycling on site easier, and the same machines can be used for different jobs later.

The FAE MTM/HP

The FAE MTM/HP works with 300 to 360 hp tractors and has a maximum working depth of 40 cm. Due to its compact size and extreme maneuverability, it can work on surfaces that self-propelled machines find difficult to access, as well as on small construction sites.

The variable geometry of the crushing chamber is a technological solution from FAE that’s unique in this industry and guarantees optimal crushing results.

This technology has two important benefits. First, it allows the machine to penetrate the soil with just the rotor because of the moving frame that can be hydraulically adjusted with extreme precision from the tractor cab. Second, the mixing chamber’s volume is variable.

As the depth increases, the chamber’s volume also increases, and so does the ability to manage the material being mixed. In addition, FAE heads with a variable geometry chamber reduce traction forces, which in turn means lower fuel consumption, higher operating speed, and improved stability of the machine on the ground.

A FAE MTM-HP from the back
3. A FAE MTM-HP from the back

Another notable technical feature is that the options include the High Flow Water Spray System – WSS and Full Control System – FCS. They are especially useful on the MTM/HP because:

  • they stabilize the temperature of the teeth, which minimizes wear and extends service life;
  • they prevent overheating to guarantee continuous output over the long term and reduce the risk of downtime;
  • they contain/reduce the amount of dust generated during breaking/recycling, for optimal work in urban environments or on busy roads.

The FAE MTM/HP is also equipped with a counter blade made of wear-resistant Hardox®, which, together with the grill on the rear flap, ensures the desired grit size of the processed material.

  Per la versione in Italiano: https://www.stradeeautostrade.it/macchine-stradali/riciclaggio-stradale-la-frantumazione-di-calcestruzzo-e-la-fresatura-di-asfalto/