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Contractors World UK & Ireland
2012 Vol 2 No 6   
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New asphalt mix using recycled tyres promises significant all round benefits - page 4 of 4

Rutting, cracking as well as noise is considerably reduced by using Road+ modification of the asphalt. In Cologne, Germany, a noise reduction of up to 5-6 dB(A) was recently achieved.

Rutting, cracking as well as noise is considerably reduced by using Road+ modification of the asphalt. In Cologne, Germany, a noise reduction of up to 5-6 dBA was recently achieved.

Transport Scotland (TS) commented: “We are pleased that industry has identified this opportunity and developed an alternative surfacing material for use on the trunk road network. This adopts a sustainable approach in making the best use of resources available, by re-using an abundant waste material and thereby reducing the use of oil-based bitumen products. TS will continue to work corroboratively with the industry under the auspices of the TS Pavement Forum and we look forward to the continued success of this initial trial.”

Extensive benefits if trials are positive

When all the data is collected and analysed, if the results show similar benefits to those done in Germany, then the Road+ product opens up many opportunities.

The German trials shows that traffic noise levels are significantly reduced - so much so, that a heavily trafficked road in Cologne, Germany, along the Rhine Riverside, was designated “Baustelle des Monats” (Construction Site of the Month) because of the dramatic reduction in noise.

The product also appears to reduce rutting and cracking and being based on a waste product the cost is more stable than using virgin chemicals. The cost is only marginally more than for standard mix but the increased durability and other benefits more than offset the little increase in material costs.

Suitable for the binder layer as well as the top layer, Road+ is suitable for a wide temperature fluctuations and extremes. Apart from the environmental benefit of using old tyres, the product itself is 100% recyclable, producing lower emissions during the process.

With road authorities under pressure to reduce costs, should the new material prove successful, then there is the potential to save on road maintenance, reduce traffic inconvenience, and provide a more enjoyable drive for road users. Roadside communities will also benefit from the reduced traffic noise that cab be a blight on their lives as roads get busier. In German trials, the product also proved suitable for heavy industrial applications such as container ports, etc.

For the contractors, there is no need for additional equipment and, the ability to work the product at lower temperature means and manually as required also reduces restriction due to cold weather.

And the big winner is the environment, now there would appear to be a good opportunity to reduce the mountains of old tyres in a useful way with benefits to the community.

No comparison with earlier rubber asphalts

Rubber in asphalt is not new and has been tried out previously with mixed success. However, the characteristics that Road+ achieves are no comparison to those of earlier generations of rubber asphalt.

Earlier generations of rubber asphalt required special equipment and proved to be sticky on applications on all types of roads and industrial applications, Road+ modified asphalt has an extremely good adhesion to the aggregate but does not stick to the equipment. Tanks and trucks do not have to be cleaned with release agents.

Contractors World will report on the results of the test as they are announced.

Click here for more information:
>>> Breedon Aggregates Road+           >>> Genan Tyre Recycling

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