Self-cleaning property of mortars with TiO2 addition using real diesel exhaust soot(Article)

Journal of Cleaner Production

Journal Article

Black crusts appearing on mortars in buildings include exogenic deposits of soot from car engines in combination with materials derived from this substrate, leading to a devaluation of the aesthetic value of the building and also to the development of decay features. A solution to counteract/minimize this problem is the addition of TiO2 in the manufacturing process due to its photocatalytic activity. This research is the first scientific paper devoted to evaluate the self-cleaning property exhibited by mortars with TiO2 addition covered with real diesel exhaust soot collected from exhaust car pipes. The evaluation of the self-cleaning property of mortars manufactured using different binders (lime-, cement- and lime & cement-based mortars with different TiO2 content) under different light irradiations (UV-A and artificial solar) and simulating the exposure to urban atmospheres rich in SO2, was carried out. The evaluation of the diesel soot oxidation was based on stereomicroscopy, field emission scanning microscopy, Fourier transform infrared spectroscopy and colour spectrophotometry. In this study the degradation of real diesel soot by photocatalysis was not as promising as previous researches reported. The mortars did not recover the initial appearance, i.e., without soot, since some soot remains were on the surfaces after thirty days of exposure. Nevertheless colour spectrophotometry allowed to infer a slight degradation of organic matter on the surface for the mortar with higher TiO2 content, mainly in lime-based mortar. © 2017 Elsevier Ltd

J.S. Pozo-Antonio



ISSN: 09596526


DOI: 10.1016/j.jclepro.2017.05.202

Alternative Titles