Nano-Additives Based on Titanium Dioxide and Silicon Dioxide for Self-Cleaning Concretes

Number of journal: 5-2021
Autors:

Tyukavkina V.V.,
Shchelokova Е.А.,
Pozhivina К.А.,
Kasikov A.G.

DOI: https://doi.org/10.31659/0585-430X-2021-791-5-47-53
УДК: 666.9.035

 

AbstractAbout AuthorsReferences
The properties of TiO2–SiO2 nanocomposites synthesized with the use of silicon-containing residues of hydrochloric acid leaching of magnesia-ferruginous slag and a solution of titanium sulfate are studied, and the possibility of their use in the composition of cement composites is evaluated. The synthesized TiO2–SiO2 nanocomposites are characterized by a high specific surface area (183–534 m2/g), the presence of a Si–O–Ti bond in their structure, and differ in the phase composition and SiO2 content. It is established that all the studied samples exhibit photocatalytic activity in the decomposition reaction of methylene blue (MS), both in the ultraviolet (UV) and visible spectral regions (VS). The degree of MS decomposition of TiO2–SiO2 nanoparticles was 86–67% and VS – 80–59% in 180 min after UV irradiation. The sample with the highest specific surface area (534 m2/g) showed photocatalytic activity only after ultrasonic dispersion in the presence of surfactants. The sample consisting of anatase and amorphous silica is superior to the commercial P25 catalyst in terms of MS decomposition. It is shown that the use of TiO2–SiO2 in the cement matrix accelerates hydration and contributes to an increase in compressive strength, while with an increase in the specific surface area, the effect of TiO2–SiO2 nanoparticles on the strength of cement stone increases. The optimal content of the additive in the composition of TiO2–SiO2 cement paste with the highest specific surface area (534 m2/g) is 0.05–0.5 wt.%, while the strength increases at the daily age by 60–73%, 28 days by 22–28%. TiO2–SiO2 nanocomposites can be used as additives in concrete matrices to improve strength properties and obtain self-cleaning surfaces
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For citation: Tyukavkina V.V., Shchelokova Е.А., Pozhivina К.А., Kasikov A.G. Nano-additives based on titanium dioxide and silicon dioxide for self-cleaning concretes. Stroitel’nye Materialy [Construction Materials]. 2021. No. 5, pp. 47–53. (In Russian). DOI: https://doi.org/10.31659/0585-430X-2021-791-5-47-53


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