Featured Research

from universities, journals, and other organizations

Road surface purifies air by removing nitrogen oxides, researchers in the Netherlands find

Date:
July 8, 2010
Source:
Eindhoven University of Technology
Summary:
Road surfaces can make a big contribution to local air purity. This conclusion can be drawn from the first test results on a road surface of air-purifying concrete. This material reduces the concentration of nitrogen oxides (NOx) by 25 to 45 per cent.

Road surfaces can make a big contribution to local air purity. This conclusion can be drawn from the first test results on a road surface of air-purifying concrete. This material reduces the concentration of nitrogen oxides (NOx) by 25 to 45 per cent, said prof. Jos Brouwers in a recent inaugural lecture at Eindhoven University of Technology in the Netherlands.

The tests were carried out in the municipality of Hengelo, where the busy Castorweg road was resurfaced last fall. As part of the project, around 1,000 square meters of the road's surface were covered with air-purifying concrete paving stones. For comparison purposes, another area of 1.000 square meters was surfaced with normal paving stones.

Researchers at TU/e carried out three air-purity measurements on the Castorweg last spring, at heights of between a half and one-and-a-half meters. Over the area paved with air-purifying concrete the NOx content was found to 25 to 45 per cent lower than that over the area paved with normal concrete. "The air-purifying properties of the new paving stones had already been shown in the laboratory, but these results now show that they also work outdoors," said prof. Brouwers. Further measurements are planned later this year.

Asphalt

Brouwers, who has been professor of building materials in the TU/e Department of Architecture, Building and Planning since September 2009, sees numerous potential applications, especially at locations where the maximum permitted NOx concentrations are now exceeded. The concrete stones used in the tests are made by, and co-developed with, paving stone manufacturer Struyk Verwo Infra, and are already available for use. For roads where an asphalt surface is preferred the air-purifying concrete can be mixed with open asphalt, according to Brouwers. It can also be used in self-cleaning and air-purifying building walls.

The use of air-purifying concrete does not have a major impact on the cost of a road, Brouwers has calculated. Although the stones themselves are 50 per cent more expensive than normal concrete stones, the total road-building costs are only ten per cent higher.

Self-cleaning

Vehicle exhaust gases contain nitrogen oxides (NOx), which cause acid rain and smog. The air‑purifying concrete contains titanium dioxide, a photocatalytic material that removes the nitrogen oxides from the air and converts them with the aid of sunlight into harmless nitrate. The nitrate is then rinsed away by rain. These stones also have another advantage: they break down algae and dirt, so that they always stay clean.

Jos Brouwers, professor of building materials at TU Eindhoven, delivered his inaugural lecture on the afternoon of Friday 2 July.


Story Source:

The above story is based on materials provided by Eindhoven University of Technology. Note: Materials may be edited for content and length.


Cite This Page:

Eindhoven University of Technology. "Road surface purifies air by removing nitrogen oxides, researchers in the Netherlands find." ScienceDaily. ScienceDaily, 8 July 2010. <www.sciencedaily.com/releases/2010/07/100706082058.htm>.
Eindhoven University of Technology. (2010, July 8). Road surface purifies air by removing nitrogen oxides, researchers in the Netherlands find. ScienceDaily. Retrieved October 21, 2014 from www.sciencedaily.com/releases/2010/07/100706082058.htm
Eindhoven University of Technology. "Road surface purifies air by removing nitrogen oxides, researchers in the Netherlands find." ScienceDaily. www.sciencedaily.com/releases/2010/07/100706082058.htm (accessed October 21, 2014).

Share This



More Earth & Climate News

Tuesday, October 21, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Traditional Farming Methods Gaining Ground in Mali

Traditional Farming Methods Gaining Ground in Mali

AFP (Oct. 20, 2014) He is leading a one man agricultural revolution in Mali - Oumar Diatabe uses traditional farming methods to get the most out of his land and is teaching others across the country how to do the same. Duration: 01:44 Video provided by AFP
Powered by NewsLook.com
Hey, Doc! Sewage, Beer and Food Scraps Can Power Chevrolet’s Bi-Fuel Impala

Hey, Doc! Sewage, Beer and Food Scraps Can Power Chevrolet’s Bi-Fuel Impala

3BL Media (Oct. 20, 2014) Hey, Doc! Sewage, Beer and Food Scraps Can Power Chevrolet’s Bi-fuel Impala Video provided by 3BL
Powered by NewsLook.com
White Rhino's Death In Kenya Means Just 6 Are Left

White Rhino's Death In Kenya Means Just 6 Are Left

Newsy (Oct. 20, 2014) Suni, a rare northern white rhino at Ol Pejeta Conservancy, died Friday. This, as many media have pointed out, leaves people fearing extinction. Video provided by Newsy
Powered by NewsLook.com
New Organic Fertilizer Helps Reforestation of Monarch Butterflies’ Winter Retreat

New Organic Fertilizer Helps Reforestation of Monarch Butterflies’ Winter Retreat

Reuters - Innovations Video Online (Oct. 20, 2014) Using an organic fertiliser, a conservationist from the National Autonomous University of Mexico (UNAM), leads an award-winning project to reforest the sanctuary of monarch butterflies. Sharon Reich reports. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins