Substantial cost and environment benefits on in-situ recycling repairs
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2012 Vol 2 No 3   
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Stabilised Pavements is using its Wirtgen 2500 to rotovate and treat the tar bound road to a depth of 200 mm, while saving an estimated 59 t of CO2 emissions.Stabilised Pavements is using its Wirtgen 2500 to rotovate and treat the tar bound road to a depth of 200 mm, while saving an estimated 59 t of CO2 emissions.


First council in London to use this method

The council is believed to be the first local authority in London choosing to partially reconstruct hazardous tar-bound roads by in-situ recycling, instead of using conventional full depth pavement reconstruction techniques with new bituminous materials. “Roads constructed in the UK prior to 1980, or surface dressed prior to the late 1980s may contain tar,” says Ian Sturrock. “Programmed maintenance works on these roads may, therefore, involve excavation of materials containing tar and disposing of them to landfill is expensive and unsustainable.”

According to the Council the cost of traditional reconstruction of the eight tar bound Enfield roads would have been about £2.5M, and just over three and a half times the cost of £0.75M for the in-situ recycling process. Treating the roads in-situ also took about a third of the time needed for traditional reconstruction, thereby also considerably minimising disruption to residents and local traffic and saving extended road closure costs.

In addition an estimated 59 t of CO2 emissions between in-situ recycling and conventional reconstruction has been saved on this road works programme.

“You don’t normally associate recycling with roads, but we’re looking at all of our options and found this is a really unusual, but efficient way of saving a lot of money,” says Enfield Council cabinet member for the environment, Chris Bond. “This scheme helps reduce the amount of hazardous waste we produce, reuses valuable raw material and saves the taxpayer money. We’ve been forced to deal with unprecedented government spending cuts and this is an innovative way of making every penny we spend count.”

 A blend of cement and pulverised fuel ash was spread as a blanket across the rotovated material to stabilise and strengthen in-situ the tar-bound road.   Cold in-situ recycling contributes to considerably reducing CO2 emissions, as the technique vastly reduces the need for extraction and transportation of existing in-situ materials to landfill sites, and the production and transportation to site of virgin materials extracted from natural sources.

A blend of cement and pulverised fuel ash was spread as a blanket across the rotovated material to stabilise and strengthen in-situ the tar-bound road.

“In-situ recycling has shown to be less disruptive to local traffic than conventional reconstruction as we have saved about 300 movements of 20 t wagons and improved our carbon footprint,” says Ian Sturrock. “The advantage of recycling, compared to other methods, is that the work can be completed quickly with minimal disruption. Additionally scarce resources will be saved by recycling the road and there will be a reduction in CO2 emissions.

“Recycling the road is quicker, more cost effective and better for the environment than conventional replacement. The process is carried out in accordance with the Transport Research Laboratory TRL Report’s 386 & 611: Design guide and specification for structural maintenance of highway pavements by cold in-situ recycling.”

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