Volume 7, 2020
Special Issue - The emerging materials and processing technologies
|Number of page(s)||9|
|Published online||06 April 2020|
Innovative hydraulic lime-based finishes with unconventional aggregates and TiO2 for the improvement of indoor air quality
Department of Materials, Environmental Sciences and Urban Planning (SIMAU), Università Politecnica delle Marche (UNIVPM), INSTM Research Unit, Ancona, Italy
2 Department of Biomolecular Science, Biotechnology Section, University of Urbino “Carlo Bo”, Urbino, Italy
3 Department of Life and Environmental Sciences (DiSVA), UNIVPM, Ancona, Italy
4 Institute of Atmospheric Sciences and Climate, National Research Council (ISAC-CNR), Bologna, Italy
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Accepted: 12 February 2020
This paper reports a study on 8 unconventional hydraulic lime-based mortars able to improve indoor air quality by acting as passive systems. Mortars have been prepared with commercial sand or highly adsorbent materials as aggregates with/without TiO2 as photocatalytic agent, to test also the decomposition of airborne pollutants. Mechanical properties, hygrometric behavior, inhibition of growth of molds and depollution properties have been tested. Despite using porous materials (zeolite and activated carbon), in mortars with unconventional aggregates, compressive strength is higher than in sand-based ones, with a more than double higher water vapor permeability. Zeolite-based mortars have the highest moisture buffering capacity followed by silica gel- and activated carbon-based mortars (1.5–2 times higher than reference, respectively, because of the high porosity of unconventional aggregates). Sand-based mortars show optimum inhibitory capacity against fungal growth. Concerning unconventional aggregates, silica gel mortars have good inhibitory capacity, whereas zeolite and activated carbon give to mortars an optimum substrate for molds. Mortars with unconventional aggregates as silica gel remove more than 80% of tracer pollutant after 2 h of test, whereas zeolite-based mortars remove the 65% of it after 120 min. TiO2 enhances depollution properties as photocatalytic oxidation agent when the mortar is close to saturation.
Key words: Indoor air quality / mortar / adsorbent aggregates / titanium dioxide TiO2 / mechanical properties / microstructure / hygroscopic behavior / inhibition of moulds / depollution properties
© C. Giosuè et al., Published by EDP Sciences 2020
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