Barcelona is going to build a road bridge which may be the cleanest bridge yet. Of course it’ll have pedestrian walks and bike paths, however, what makes the bridge really noteworthy is that it will clean the air.
Concrete is notoriously energy-intensive to create so any carbon offset is beneficial. The Barcelona bridge will make use of photocatalytic concrete.
But the real prize of this thing is its basic building material,Â photocatalytic concrete. The principal of photocatylitics is that ultraviolet light naturally breaks down dirt, both natural and synthetic. Itâ€™s that old adage about sunlight being the best disinfectant. Photocatalytic concrete is used with titanium dioxide, which helps accelerate the natural UV-breakdown process, turning the pollution into carbon dioxide, and oxygen and substances that actually belong in the atmosphere.
The actual process has to do with semiconductors and electrons and other things that you may or may not care to read about. (At any rate, the Concrete Society of the United KingdomÂ does a better job of explaining it.)
An air-cleaning bridge makes for a neat news story and a sci-fi-ish novelty that environmentalists can blog about. But the important point is that Barcelona has taken a piece of infrastructure that exists solely to accommodate car culture, and re-invented it to partially offset the effects of car pollution.
The competition jury, which is composed of architects, directors of some of the world’s foremost architecture schools, and mayors of cities such as Barcelona, is looking for outstanding proposals for any city in the world, at any scale, and within any timescale. Competition entries should be submitted via the Internet (www.advancedarchitecturecontest.org) on Connected metropolises, Eco neighborhoods, Self-sufficient buildings, Intelligent homes or any other proposal for a short-, medium or long-term project to create habitats that respond to the social, cultural, environmental and economic conditions that may obtain in the 21st century. The proposal should include whatever texts, drawings and other images may be needed to make it fully understandable.
The competition prizes will consist of three scholarships for the IaaC Masters in Advanced Architecture for academic year 2010-11, cash prizes, and the latest generation of large-format HP printers. The selected projects will go on show in a major exhibition, due to open in Barcelona in May 2010, which will then travel to key cities around the world. The best projects will also be featured in a book to be published by Actar. The project is supported by the Spanish Ministry of Housing, the Generalitat de Catalunya, Barcelona City Council, and the publishing house Actar.
The city joins Paris, Barcelona, and Lyon with the installation of its own public bike system, named Bixi, making 2,400 bicycles available to the public at more than 300 locations across six Montreal boroughs.
Starting next spring, residents will be able to borrow bicycles from one station and drop them off at another.
“You grab it, you ride it, you bring it back,” Montreal’s mayor Gerald Tremblay told The Canadian Press. “It will become an emblem for Montreal.”
Bixi may be a more health-friendly means of transportation, but it’s also environmentally friendly. The bikes, which were made in Quebec, are composed entirely of recycled aluminum and the parking stations run on solar power.
The entire operation cost $15 million and was paid for by Stationnement de Montreal, a company that manages the city’s on-street parking.