De-Pollution Activity Assessment of Photocatalytic Cement-Based Materials from Laboratory to Real Scale Testing

Paper by PLASSAIS GUILLOT from ISCR 10th 2006 Brussels Belgium

“Photocatalytic” materials are discussed for various applications in building technology ranging from de-soiling to de-polluting applications. However most of the efficiency proofs are derived from indirect laboratory scale tests. Italcementi Group has developed a range of cement-based products based on the TX Active? concept demonstrating both photocatalytic activity and performances (mechanical and chemical). Photocatalytic de-pollution efficiency has been assessed from laboratory to in situ tests as well as numerical simulations: (i) The laboratory tests allow a fast and controlled evaluation; (ii) In situ measurements allow a direct assessment; (iii) numerical simulations allow correlating the first two data and further predicting. In this paper are described two different laboratory test methods for which we propose a global way of interpreting the data. Moreover, examples of in situ measurements are given. In particular, a three month measurement campaign on the so-called Street Canyon Pilot (as part of the European project PICADA) has been performed: four lines of buildings were built at scale 1:5. The pollution level and meteorological conditions were measured for background and inside the street. It evidences a significant pollution reduction inside the street thanks to photocatalytic concrete. Other different in situ assessments on road applications (paving blocks and soundproof walls) have confirmed previous results.

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