Improvement of the depolluting and self-cleaning abilities of air lime mortars with dispersing admixtures

The aim of this study is to develop new air lime mortars with enhanced photocatalytic depolluting and self-cleaning abilities. Nanosilica, as pozzolanic mineral admixture, was used improve the strength mortars, whereas nanotitania (TiO2) added impart properties. At same time, five different dispersing admixtures –superplasticizers– were in bulk enhance activity by reducing rate charge carrier recombination. Four polycarboxylate-based derivatives a polynaphthalene sulfonate tested aiming achieve an efficient separation. In order increase lasting subjected water movements, sodium oleate also repellent agent. Since photoinduced hydrophilicity, responsible for effect, might be affected repellent, compatibility between admixture performance investigated. Results showed that improved due action superplasticizers indicated average 33% NO degradation, which significant these mortars. Furthermore, greatly reduced release intermediate toxic compounds, mainly NO2: selectivity factor (NOx/NO) reached values up 87%. ability, studied through dye SPs around 1.2 times. Three photosensitization under visible light irradiation, resulting faster decolouring kinetics. connection performance, preserved hydrophilicity reaching good wettability surface (water contact angles ca. 10°), even presence oleate, proving compatible characteristics allowing obtaining range actively