Asphalt recycling

The Asphalt Cycle

In industrially developed countries, significantly more roads are rehabilitated or extended than completely new roads are built. But what happens to the old road surface?

Recycling asphalt is an economic imperative in order to conserve natural resources. Using the maximum amount of recycled asphalt not only protects the environment, it also positively affects RAP prices.

BENNINGHOVEN asphalt plants

BENNINGHOVEN offers a wide range of "hot and cold" recycling feed systems designed to produce the highest quality RAP. The recycling technologies can also be individually customized and integrated to retrofit existing asphalt mixing plants. The maximum theoretical amount of asphalt that can be added depends largely on its grading curve – or, to put it another way, on the quantity, size, and composition of its constituents. As a result, one goal must be to align the grading curve of the crushed asphalt as closely as possible to the desired grading curve of the final asphalt product.

“BENNINGHOVEN offers recycling technologies – whether hot or cold feed system – for every customer requirement.”

Recycling technology
KLEEMANN MOBIREX MR 130 Z EVO2

This is where the MOBIREX MR 130 Z EVO2 mobile impact crusher from KLEEMANN, equipped with a secondary screening unit, comes in. The ability to flexibly adjust the rotor speed and the crushing gap via a touch panel makes it possible to achieve the desired grading curve.

WIRTGEN Cold Milling Machines

First, however, the asphalt must be recovered by removing individual layers of the road structure. Cold milling machines are perfect for this because they are capable of selectively milling these layers. As a result, it’s possible to remove the surface layer, binder course, and base layer separately and recycle them separately.

“WIRTGEN’s leveling technology adjusts height, depth, and pitch for extremely accurate results.”

WIRTGEN Leveling Technology
Recycling drum with hot-gas generator with counterflow action
  • Up to 90% + x addition of recycling material possible
  • Highest possible feed rates of recycling material
  • Indirect heating of the material
  • Recycling material takes the straight, easy route through the entire system
  • No deflection of the recycling material, which could result in blockages and adhesions/deposits
  • Mixer is positioned directly vertical underneath the recycling drum
  • Careful use of resources
  • Lower emissions figures Cges < 50mg/Nm³
  • The system meets the requirements of the new “Technical Instructions on Air Quality Control” (German regulation “TA Luft”)
  • This process ensures that the recycling material is already heated to processing temperature (160 °C)
  • Highly positive overall energy balance of the plant
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Benefits
Perfectly compatible machine technology
Conserves resources
Cost Efficiency
Go with the Counterflow

Interview with Dirk Auler, Product Trainer at BENNINGHOVEN

To the Interview
Materials processing
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