Mutual interactions between carbonation and titanium dioxide photoactivity in concrete

Diamanti, Maria Vittoria; Lollini, Federica; Pedeferri, MariaPia; Bertolini, Luca

doi:10.1016/j.buildenv.2013.01.023

Cited by 48 publications

(18 citation statements)

References 22 publications

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“…From the results (Tab. 2) it is shown that the addition of TiO 2 does not imply substantial differences in compressive strength results probably due to pore-refining and accelerating effect on hydration, as indicated in [17], despite other findings in literature, where it is shown that TiO 2 could decrease [18] mechanical behavior if the amount of binder decreases. Zeolite (A1) based mortars show values slightly higher (about 5%) than the reference mortar.…”

Section: Mechanical Propertiesmentioning

confidence: 78%

Innovative hydraulic lime-based finishes with unconventional aggregates and TiO₂ for the improvement of indoor air quality

et al. 2020

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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.

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Section: Mechanical Propertiesmentioning

confidence: 78%

Innovative hydraulic lime-based finishes with unconventional aggregates and TiO₂ for the improvement of indoor air quality

et al. 2020

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“…This first evaluation was performed on all samples; results concerning non-treated TiO2 powders are shown as an example in Figure 4, but the same considerations apply to acid treated powders. Data reported are related to the percent decrease in a* coordinate intensity, which can be taken as an indirect measurement of dye degradation percentage [50]. The effect of sand is that of magnifying the photocatalytic efficiency of TiO2 NPs: this was ascribed to possible beneficial effects of better powder dispersion and refraction of light within the layer of sand-admixed paint with respect to NPs dispersed in the paint.…”

Section: Resultsmentioning

confidence: 99%

“…Then, the full characterization was performed on complete samples (paint, sand, and NPs). To check photocatalytic activity, rhodamine Ban azo dye with magenta huewas chosen, as it is commonly accepted and utilized to test the efficiency of photocatalytic materials as representative of organic pollutants, as attested by several independent research groups [14,29,31,[47][48][49][50].…”

Section: Characterizationmentioning

confidence: 99%

Self-cleaning building materials: The multifaceted effects of titanium dioxide

Paolini

Borroni

Pedeferri

et al. 2018

Construction and Building Materials

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The physical integrity and photocatalytic performance of titanium dioxide (TiO2) deteriorate with aging. Here we propose a pre-treatment with nitric or sulfuric acid of commercial TiO2 nanopowders used in coating, mortars, or paints. The diffuse reflectance is increased between 1500 and 2500 nm by 0.04 and 0.06, respectively, with nitric and sulfuric acid (unaffected by neutralization). Nitric acid causes a decrease in crystallinity and photocatalytic activity, which drops by almost 20%; this drawback is prevented by post-treatment neutralization, which allows to recover initial photocatalytic efficiency and even increase it. Treatment with sulfuric acid shows no significant effect on photoactivity, instead.

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“…Beside changes occurring during setting and hardening the microstructure of concrete and mortars evolves in time during the service life of structures [24]. Diamanti et al [10] focused on mechanical and durability aspects of TiO 2 -containing photocatalytic concrete by examining mutual influences between TiO 2 and concrete components, and their evolution with the material aging. Materials were produced by adding the commercial form of TiO 2 (P25) to concrete.…”

Section: Tio 2 Effect On the Compressive Strengthmentioning

confidence: 99%

Concretes with Photocatalytic Activity

Janus¹,

Zając²

2016

High Performance Concrete Technology and Applications

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This chapter is a short review about the modified concretes with photocatalytic activity. In the beginning, the photocatalysis process is explained; the authors are focused on the mechanism of organic contamination and nitrogen oxide decomposition. Next the three main methods for concretes modification are presented: the first group is when the concrete is covered by thin layer of TiO 2 materials, e.g., paints or TiO 2 suspensions. The second group is the concretes with thick layer of photoactive concrete on the top. The third group constitutes concretes modified in mass with TiO 2. The two main methods for photocatalytic activity of the modified concrete determination were shown: an air purification by a nitrogen oxide decomposition and the self-cleaning properties by dyes decomposition. Also in this chapter the mechanical properties of the modified concrete are presented. In the end, the examples of the buildings made of photocatalytic concretes are shown.

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Mutual interactions between carbonation and titanium dioxide photoactivity in concrete

Cited by 48 publications

References 22 publications

Innovative hydraulic lime-based finishes with unconventional aggregates and TiO₂ for the improvement of indoor air quality

Innovative hydraulic lime-based finishes with unconventional aggregates and TiO₂ for the improvement of indoor air quality

Self-cleaning building materials: The multifaceted effects of titanium dioxide

Concretes with Photocatalytic Activity

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Mutual interactions between carbonation and titanium dioxide photoactivity in concrete

Cited by 48 publications

References 22 publications

Innovative hydraulic lime-based finishes with unconventional aggregates and TiO2 for the improvement of indoor air quality

Innovative hydraulic lime-based finishes with unconventional aggregates and TiO2 for the improvement of indoor air quality

Self-cleaning building materials: The multifaceted effects of titanium dioxide

Concretes with Photocatalytic Activity

Contact Info

Product

Resources

About

Innovative hydraulic lime-based finishes with unconventional aggregates and TiO₂ for the improvement of indoor air quality

Innovative hydraulic lime-based finishes with unconventional aggregates and TiO₂ for the improvement of indoor air quality