verdun Reconstruction des viaducs du boulevard de l'Ile-des-Soeurs / Parc West Vancouver

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[Chuck-A]

il y a 58 minutes, Rocco a dit :

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19 hours ago, Windex said:

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19 hours ago, Rocco said:

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18 hours ago, Chuck-A said:

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[Chuck-A]

Montreal using recycled wine bottles to replace Darwin bridge on Nuns' Island
Project will replace 10% of cement with glass powder, equivalent of 70,000 wine bottles

CBC News · Posted: Oct 15, 2020 5:00 AM ET | Last Updated: 7 hours ago

Étienne Cantin Bellemare, the lead designer and engineer behind the Montreal project, holds up an example of the crushed glass that is being added the Darwin Bridge project. (Charles Contant/CBC)

A pair of age-worn bridges are being replaced on Nuns' Island, but the cement used to construct the new structures will have an unusual ingredient — 70,000 wine bottles.

"It's an opportunity for this glass to, let's say, have a second life," said Étienne Cantin Bellemare, the lead designer and engineer behind the Montreal project.

"We are going to replace 10 percent of the cement with glass powder."

He said using the glass powder will reduce the energy consumed to produce the needed cement for the bridges, enough to cut CO2 emissions by 40 tonnes.

But drivers won't notice any difference and neither will those passing underneath.

The Darwin bridge is a set of overpasses that allows pedestrians and cyclists to cross under Île-des-Sœurs Boulevard's four lanes safely.

The old structures were built in 1967 near the St. Lawrence River's shoreline and have reached the end of their life, Montreal says.

Construction of the first of two bridges — the east side — is slated to be completed next month, and the second next fall, Montreal says on its website.

This means giving a second life to around 70,000 bottles which might otherwise end up in a landfill.

Montreal says the two bridges will also be a pilot project for the use of stainless steel rebar, which has "excellent corrosion resistance."

The glass, the city says, will add to the durability while helping relieve the pressure on Quebec's recycling centres, which are overflowing with empties.

"The durability of these bridges will last over 100 years," the city says in a statement.

Ground down to a micron

To add glass to cement, Bellemare said it is ground down to the size of a micron, about 1/60th the width of a human hair.

He said the material isn't just energy efficient — it will also make the bridge more resistant to winter conditions than traditional cement.

The set of overpasses that allow pedestrians and cyclists to cross under Île-des-Sœurs Boulevard's four lanes safely are being replaced with new building techniques. (Charles Contant/CBC)

"This glass is much more resilient to freeze and thaw and de-icing material," he said.

Bellemare hopes that if all goes well, the procedure will create a new, sustainable construction technique. It could be used to construct even larger bridges, he said.

And Quebec's liquor board is offering its help in the project, chipping in enough wine bottles to replace 40,000 kilograms of cement, or 1,340 bags of cement from the local hardware store, the SAQ says on its website.

From store floors to urban furniture

Both Montreal and the SAQ are touting this bridge construction technique as a worldwide first, but CBC could not independently verify that claim, as adding crushed glass to cement is not a new practice.

The SAQ has been promoting the technique since 2004, having helped found a chair position at the Université de Sherbrooke that specifically focuses on recycling recovered glass.

Mixing glass powder into cement has been used to create store floors and urban furniture. Glass powder has even been added to some of Montreal's sidewalks in recent years.

In a statement, Christian Marier-Pilon, the SAQ's director of social responsibility, describes the mixing technique as "genius."

"It's an incredible way to improve concrete's performance while making use of a recovered material that too often ends up in landfill," he says.

https://www.cbc.ca/news/canada/montreal/darwin-bridge-montreal-glass-crushed-cement-1.5762667

[KOOL]

Au retour de la pointe Sud ce soir je suis passé par le nouveau viaduc direction Nord. Le plus tôt possible je vous envoie des photos à partir du 15ème du 201 Corot. 

[Invité]

Ça date de la nuit dernière 

[Rocco]

De toute beauté. Regardez moi ce béton fait tout croche, déjà jauni par endroit, et cette cloture blanche digne de Lietteville par dessus. Non mais on l'a tu l'affaire pour nos structures, on l'a tu au Québec.... Ça fait pitié. C'est neuf, bordel! Et c'est presque pire que la structure qui datait de 60 ans. Honte, encore, à nos donneurs d'ouvrage.

[Invité]

Après de très longues recherches sur Internet, je ne sais toujours pas combien va coûter cette splendeur. Difficile de savoir combien on paie pour du travail souvent bâclé (viaduc Berri, par exemple) ou dégradé immédiatement (graffiti au viaduc Turcot). Comme si la chose était sans importance. Le parc West Vancouver, juste à côté, a vu son aire de jeux subir un lifting récemment. De mémoire, plus de 200 000 dollars. Un muret, un sentier, trois chaises longues, du paillis (on a conservé les jeux!) : 200 000 dollars! Imaginez la facture du pont d’étagement qui sera prêt dans 12 mois. C’est long, c’est cher, c’est moche. Et c’est partout comme ça. Ajoutez les coûts de la COVID à toutes ces dépenses et on en a pour deux ou trois cents... siècles à payer.

[KOOL]

Ça date de l'automne dernier et ce n'était pas encore asphalté. À noter qu'au final la dalle de béton du milieu est surélevée par rapport au niveau de la rue. Hallucinant tout ce botchage ! Je dois en recevoir une plus récente dès que la route ne sera plus enneigée. 

[Rocco]

22 minutes ago, KOOL said:

Ça date de l'automne dernier et ce n'était pas encore asphalté. À noter qu'au final la dalle de béton du milieu est surélevée par rapport au niveau de la rue. Hallucinant tout ce botchage ! Je dois en recevoir une plus récente dès que la route ne sera plus enneigée. 

Et au final je remarque des murets de béton beaucoup plus invasifs que l'original de 1967. Ça fait dur, pas de doute là dessus!