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Contractors World - International
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construction, demolition, mining and quarrying industries.
 
Contractors World International - 2017 Vol 8 No 3

 

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Developments on Cold Recycling with Foamed BitumenDevelopments on Cold Recycling with Foamed Bitumen - continued

 

What is foamed bitumen and how is it made?

Foamed bitumen is produced by injecting small quantities of water and air into hot bitumen under high pressure.
    The water evaporates and makes the bitumen foam up rapidly to between 15 and 20 times its original volume.

The foam is then injected into a mixer through injection nozzles and optimally mixed into cold and moist construction materials.

The foam is then injected into a mixer through injection nozzles and optimally mixed into cold and moist construction materials.
   The quality of the foamed bitumen is primarily described in terms of the parameters “expansion ratio” and “half-life”.
   The greater the expansion ratio and half-life, the more easily the foamed bitumen can be processed.

A key attribute of the WLM 30 twin-shaft compulsory mixer for batches of approximately 30 kg.

• WLM 30 laboratory scale mixer

A key attribute of the WLM 30 twin-shaft compulsory mixer for batches of approximately 30 kg.

The WLM 30 laboratory scale mixer defines the best mix composition and reliably produces different mix formulas in a very short time.

• WLB 10 S laboratory foamed bitumen plant

The foamed bitumen quality can be accurately defined in preliminary tests in the WLB 10 S mobile foamed bitumen plant even before construction starts.

With its simple operation, parameters such as the water volume, pressure and temperature can be varied.

 

Wirtgen Group

 


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