backtop


Print 26 comment(s) - last by tmouse.. on Jul 14 at 7:50 AM


  (Source: TopNews.in)

Titanium Dioxide concrete  (Source: Treehugger)
Could improve breathing, but costs 50 percent more than regular concrete

Eindhoven University of Technology (EUT) researchers revealed that 45 percent of nitrogen oxides on the road can be removed by creating a roadway made with concrete that is blended with titanium dioxide.  

The study was conducted by the EUT in the Netherlands on a 1,000-square-meter repaved road. Jos Brouwers, professor of building materials at the EUT, noted that the air-purifying test in the new pavement proved to be effective in the laboratory, and has now proved to be effective outdoors as well.

When tested outdoors in the town of Hengelo, the pavement blended with titanium dioxide showed a 25 to 45 percent reduction in nitrogen oxide that came in contact with it as opposed to regular concrete. Titanium dioxide is a photocatalytic material that grabs airborne nitrogen oxides and converts it to harmless nitrates with the help of the sun, and it is washed away by the rain. In addition, the mixed material breaks down dirt and algae, so it is sure to stay clean. 

The cost of lacing titanium dioxide into the concrete costs approximately 50 percent more than traditional concrete, but the increase total road-building costs is only 10 percent. 

The idea of adding titanium dioxide to concrete is not a new concept. In 2007, Italian company Italcementi developed a cement that was also laced with titanium dioxide, and could neutralize certain harmful pollutants. It's called TX Active, and when exposed to sunlight or ultraviolet light, the titanium dioxide transforms any nitrogen oxides or sulfur oxides into harmless nitrates or sulfates which can be washed away by rainwater, much like the titanium dioxide mix that EUT researchers are testing in the Netherlands right now.

Researchers at the EUT are still conducting additional testing, but see a lot of advantages to using titanium dioxide-mixed concrete that could help people breathe cleaner air. But despite these advantages, it will take awhile for this project to come into effect due to the time and cost it will take to repave every road. 



Comments     Threshold


This article is over a month old, voting and posting comments is disabled

Catalytic converter?
By troysavary on 7/13/2010 5:31:08 PM , Rating: 2
There are already catalysts in a car's exhaust system that remove most of the harmful emissions. (Note, CO2 is NOT a harmful emission.) Modern cars actually produce very little in the way of pollution if they are well maintained. As more and more older cars are retired, and replaced with cleaner cars, the need for this concrete seems to me to be non-existent except for in some problem spots. All in all, it does not seem to have a cost to benefit ratio to make it viable to start resurfacing tens of thousands of miles of roadways.




RE: Catalytic converter?
By diggernash on 7/13/2010 8:10:39 PM , Rating: 2
Found under sham: snake oil, radon detectors, lead paint detection kits, asbestos removal, and now titanium dioxide pavement.

What a perfectly impartial, science based world we live in...LOL.


"Intel is investing heavily (think gazillions of dollars and bazillions of engineering man hours) in resources to create an Intel host controllers spec in order to speed time to market of the USB 3.0 technology." -- Intel blogger Nick Knupffer














botimage
Copyright 2014 DailyTech LLC. - RSS Feed | Advertise | About Us | Ethics | FAQ | Terms, Conditions & Privacy Information | Kristopher Kubicki