Noxer pavement - Treating pollution at source

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Over one million tons of nitrogen oxides (NOx) are generated in France every year; vehicle exhaust
accounts for nearly 50% of that volume. These emissions constitute a health hazard and are
involved in many respiratory disorders, especially in vulnerable people.
To address this problem and public health issue, Eurovia has developed a unique innovative
process, NOxer, which eliminates certain air pollutants (NOx).
When NOxer is applied to pavements, it traps and eliminates pollution at source.

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Noxer pavement - Treating pollution at source

  1. 1. NOxer Pavement Treating pollution at source
  2. 2. NOxer POLLUTION REDUCING PAVEMENT SURFACING Over one million tons of nitrogen oxides (NOx) are generated in France every year; vehicle exhaust accounts for nearly 50% of that volume. These emissions constitute a health hazard and are involved in many respiratory disorders, especially in vulnerable people. To address this problem and public health issue, Eurovia has developed a unique innovative process, NOxer, which eliminates certain air pollutants (NOx). When NOxer is applied to pavements, it traps and eliminates pollution at source. key benefits key figures A broad palette of colours B lends perfectly into the environment Pollution reduction of over 4mg/m2/hr A sustainable process U ses roads as broad pollutionreducing surfaces I mproves the quality of air inside and outside the vehicle passenger compartment E liminates pollution at source 30% of the NOx eliminated locally at vehicle level 15% to 25% of overall pollution eliminated
  3. 3. innovation serving pollution reduction EFFective over time… … in all its FORMS NOxer optimises pollution reduction since exhaust gases come into direct contact with the active surface as soon as they are emitted. The surface characteristics of the NOxer pavement are identical to those of a conventional asphalt surfacing in terms of texture and skid resistance. In addition, the NOxer pavement is a sustainable process: the active agent, photocatalytic TiO2, acts as a catalyst and is not consumed in the pollution reduction process. Its reactivity is therefore not limited in time. The colour of the slurry is selected by the client from a wide range of available colours. Lightcoloured pavements can be applied in tunnels and access ramps to save lighting and improve safety. Shoulders, sidewalks and central reservations can also be surfaced with NOxer. The first NOxer pavement projects were carried out in the summer of 2006. Eurovia offers the NOxer pavement as one of its solutions for controlling the environmental impact of road infrastructure; it is a further instance of Eurovia’s commitment to sustainable development. The use of NOxer in road pavements is an Eurovia innovation. The NOxer pavement addresses the environmental concerns of contracting authorities in urban areas and zones of heavy traffic.
  4. 4. across the board PERFORMANCE NOxer is an air pollution reduction process based on a titanium dioxide (catalytic TiO2 ) reaction. When TiO2 comes into contact with the ultra-violet radiation contained in sunlight, it is activated and catalyses a chemical reaction in which nitrogen oxides (NOx) present in air are transformed into stable nitrogen compounds. These stable nitrogen compounds are washed away by rainwater. The amounts precipitated are minute compared to the limits defined for drinking water. OPTIMum application The NOxer pavement is made up of an opengraded asphalt mix into which a slurry containing photocatalytic titanium dioxide is percolated. The asphalt mix – which can be, for example, a very thin asphaltic overlay (VTAO) - has a high voids content. It is laid conventionally by paver in a thickness of 25 to 35mm. The slurry is made up, among other things, of mineral filler, cement, fibres and titanium dioxide. It is spread manually. The pavement can be reopened to traffic a few hours after the work is completed, depending on weather conditions which influence the time needed for the slurry to dry. Coloured pigments can be added to the mix to blend the pavement into the local landscape or architecture. SPECTACULARS ReSULTS The NOxer process achieves spectacular results. An in situ inspection method to measure the effectiveness of the material was specially developed for the laboratory and the worksite. The effectiveness of NOxer is confirmed by pollution reduction values of over 4m/m2/hr using this protocol. Other studies measuring the environmental impact in an open environment have shown that the number and intensity of pollution peaks is reduced in areas treated with Noxer. TECHNICAL DEPARTMENT 18, place de l’Europe - 92565 Rueil-Malmaison Cedex Tel. : 33 (0)1 47 16 38 00 - Fax : 33 (0)1 47 16 38 01 www.eurovia.com technique@eurovia.com - December 2013 - photos credit : photolibrary Eurovia ACTION… REACTION!

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