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Road Surface Purifies Air By Removing Nitrogen Oxides
Eindhoven, Netherlands (SPX) Jul 08, 2010 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 his inaugural lecture recently. 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 Eindhoven University of Technology (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 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 Jos Brouwers, professor of building materials at Eindhoven University of Technology, delivered his inaugural lecture on the afternoon of Friday 2 July.
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