"Like what, we can do ecological without being more expensive! ", says François Durovray (LR), president of the departmental council of Essonne, visiting the site of the RD12, in Valpuiseaux. For several years, Jean Perthuis (LR), mayor of this town of 612 inhabitants, asked the department to rebuild this road "in poor condition". "Residents came to see me several times to tell me that their rim or tire had been damaged because of this road," he says.
And it will soon be done since, as of June 9, drivers will walk a road redone and "ecological". Because this 3 km portion will be composed of almost 100% recycled materials.
40% less CO2
The objective of this experimental project is multiple: reduction of nuisances with less odours, dust and discharges, more virtuous practices for adaptation to climate change with recycling of the roadway, short circuits to recover aggregates, reduction of energy consumption or reduction of delays.
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"We keep the planing milling milling (Editor's note: rubble from cutting the top layer of a roadway) recovered from a nearby construction site, on the RD 837, to make a new asphalt," explains Cédric Pantel, Île-de-France regional director for the public works company Colas, at the origin of this process.
A method that makes it possible not only to recycle but also to emit nearly 40% less CO2 than during a conventional renovation thanks to a "cold kneading". "Normally, we would have had to do two interventions and completely take over the structure, whereas here, we simply have a road surface which saves time," adds Cédric Plantel.
In total, this operation amounts to 660,000 euros. "It's less than for a traditional road construction site," insists François Durovray.
A process that does not adapt everywhere
"We've wanted to try this technique for a while and it's the first time we've done it over such a long distance in Essonne. But it is important to note that it remains a surface sensitive to tearing, so it is not suitable for all roads, especially those where there is a lot of traffic or places like crossroads, "says Sébastien Garguet, works controller for the South Essonne territorial unit.
The other constraint related to this process remains the duration of "ripening" of the road. "We have to wait five to seven days before we can ride on it again to avoid a break," explains Eric Ogé, head of the Sud Essonne territorial unit.
Despite these few disadvantages, the benefits outweigh for the department, which already plans to duplicate this type of project as part of its road master plan.