The purpose of this work is to investigate the influence of the addition of TiO2 nanoparticles on the rheological, physico-mechanical and photocatalytic properties of alkali-activated slag-based mortars. The self-cleaning capability of TiO2-containing composites were evaluated by means of accelerated dye degradation tests and 24-months outdoor exposure tests in comparison with Portland-based mortars. Experimental results show that the variation of the rheological properties of mixtures due to the addition of TiO2 is negligible while it can be noted a general reduction on the setting times by increasing the amount of the TiO2 content. The use of TiO2 seems to have a minor effect on the elasto-mechanical properties of slag-based mortars at early and long ages. Only alkali-activated materials with low alkali content evidence an increase in compressive strength from 9 to 14% with respect to the same mortars manufactured without nanoparticles. The beneficial effect of TiO2 addition in self-cleaning capability is evident both in cementitious and alkali-activated mortars under accelerated tests. In particular, regardless of UV light exposure time and dye nature, the color variation increases almost linearly by increasing the nanoparticles content. Finally, the self-cleaning ability has been evaluated by measuring the color variation during the exposure of mortar samples to the industrial environment for 2 years. Results evidenced the efficiency of the titanium dioxide on the reduction of the color variation promoted by the polluted environment.

(2024). The Influence of TiO2 Nanoparticles on the Smart Properties of Alkali-Activated Materials . Retrieved from https://hdl.handle.net/10446/297835

The Influence of TiO2 Nanoparticles on the Smart Properties of Alkali-Activated Materials

Coffetti, Denny;Rapelli, Simone;Coppola, Luigi
2024-01-01

Abstract

The purpose of this work is to investigate the influence of the addition of TiO2 nanoparticles on the rheological, physico-mechanical and photocatalytic properties of alkali-activated slag-based mortars. The self-cleaning capability of TiO2-containing composites were evaluated by means of accelerated dye degradation tests and 24-months outdoor exposure tests in comparison with Portland-based mortars. Experimental results show that the variation of the rheological properties of mixtures due to the addition of TiO2 is negligible while it can be noted a general reduction on the setting times by increasing the amount of the TiO2 content. The use of TiO2 seems to have a minor effect on the elasto-mechanical properties of slag-based mortars at early and long ages. Only alkali-activated materials with low alkali content evidence an increase in compressive strength from 9 to 14% with respect to the same mortars manufactured without nanoparticles. The beneficial effect of TiO2 addition in self-cleaning capability is evident both in cementitious and alkali-activated mortars under accelerated tests. In particular, regardless of UV light exposure time and dye nature, the color variation increases almost linearly by increasing the nanoparticles content. Finally, the self-cleaning ability has been evaluated by measuring the color variation during the exposure of mortar samples to the industrial environment for 2 years. Results evidenced the efficiency of the titanium dioxide on the reduction of the color variation promoted by the polluted environment.
2024
Coffetti, Denny; Crotti, Elena; Rapelli, Simone; Coppola, Luigi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10446/297835
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