The Structure of Cement Stone With Dispersed Titanium Dioxide  in Daily Age

Лукутцова, Н П; Pikin, Aleksey; Golovin, S.N.; Postnikova, O. N.; Borovik, E. S.

doi:10.12737/22432

Cited by 3 publications

(2 citation statements)

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“…T he development and application of photocatalytically active construction materials is one of the promising directions for improving environmental safety and ensuring sustainable development of settlements and territories that contribute to reducing concentrations of pollutants in the atmospheric air (volatile organic substances, ammonia, nitrogen and sulfur oxides, etc.) due to their decomposition to low-toxic or non-toxic products (oxygen, carbon dioxide, water, sulfates, nitrates and nitrites) as a result of redox reactions occurring in the structure of the material when irradiated with light [1][2][3][4][5][6][7][8]. Achieving the self-cleaning mechanism of the outer layers of composites with photocatalysts through more efficient flushing of pollutants with water due to surface hydrophilization is another positive aspect of the use of such materials, which makes it possible to maintain the original purity and color of building products and structures for a long time under the influence of adverse environmental factors [6,[9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…Anatase form of titanium dioxide is currently the most widely studied and successfully used photocatalyst [4,5,7,8,[9][10][11][12][13][14][15] due to its chemical stability, non-toxicity, and the special band structure, which determines its high photocatalytic activity. However, photocatalysis using titanium dioxide also has a number of disadvantages.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the effectiveness of mineral additives in cement systems in the development of “core – shell” photocatalytic compositions

Balykov¹,

Nizina²,

Kyashkin³

et al. 2022

Nanobuild

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Introduction. Creation of highly efficient photocatalysts for construction composites, which are characterized by increased activity and an extended spectral range of action, is a very important area of research. It is known that "core (substrate)shell (photocatalyst)" compositions, where mineral raw materials of various genesis can act as carriers, are one of the most effective types of photocatalytic additives for cement systems. It is worth noting that for integrated assessment of the substrate efficiency, we need to obtain information on the composition and properties of raw materials used among which its chemical activity and structure-forming role in cement systems are of paramount importance. The purposes of this study are (1) to establish the influence pattern of four types of mineral additives (silica fume, metakaolin, expanding sulfoaluminate modifier and microcalcite) on the structure formation processes of plasticized cement systems and (2) to identify the most effective modifiers for further use as mineral substrates in the photocatalytic compositions. Methods and materials. Specific surface area and granulometric composition of mineral modifiers were determined by the Kozeny-Karman and laser diffraction methods. The phase composition of mineral additives and modified cement systems were studied using X-ray diffraction phase analysis. Results and discussion. Features of mineralogical and granulometric compositions of mineral additives were revealed. It was determined that the use of individual and complex mineral additives based on silica fume, metakaolin and ESAM made it possible to directionally influence on content of the main phases of cement stone such as ettringite, portlandite, calcium hydrosilicates of different basicity. Conclusions. The increased chemical activity of these modifiers in cement systems, due to presence of reactive minerals in the structure, along with features of the granulometric composition (high dispersity and narrow particle size distribution), indicated the potential prospects for their use as mineral substrate in "core -shell" photocatalytic compositions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of the effectiveness of mineral additives in cement systems in the development of “core – shell” photocatalytic compositions

Balykov¹,

Nizina²,

Kyashkin³

et al. 2022

Nanobuild

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Photocatalytic Active Self-Cleaning Cement-Based Materials. Compositions, Properties, Application

Antonenko

Ogurtsova

Строкова

et al. 2020

Bulletin of Belgorod State Technological University Named After. V. G. Shukhov

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The paper reviews the available technologies for producing photocatalytic active self-cleaning materials based on cement, including concretes and dry building mixtures. Used photocatalytic additives and their influence on the cement system are considered. The applied methods for assessing the photocatalytic activity of self-cleaning cement materials are presented. The compositions of concrete mixtures, their properties, areas and prospects of application are analyzed. The main problems of development, production and application of photocatalytic active self-cleaning materials based on cement are presented. The main directions to increase the self-cleaning ability of photocatalytic active materials based on cement are: optimization of the microstructure of the photocatalyst and the composite with its use in the direction of creating a developed surface of the photocatalyst - hierarchical microstructure; it intensifies the diffusion processes of photocatalytic reaction reagents and increases the contact area photocatalyst with a pollutant; it absorbs and accumulates ultraviolet radiation waves; optimization of the phase composition of titanium dioxide - search for the ratio of the anatase and rutile phases, at which the maximum photocatalytic activity is achieved; choosing of economically feasible method for periodical updating of the surface of concrete products carbonized during operation in order to restore self-cleaning ability.

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Acid-Base Properties of the Surface of Micro-Reinforcing Fibers as a Component of a Photocatalytic Composite Material for Plaster Mixes

Nerovnaya,

Sival'neva,

Strokova

et al. 2023

Bulletin of Belgorod State Technological University Named After. V. G. Shukhov

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The analysis of fibers of various types from the point of view of their use as a component of a photocatalytic composite material (PCM) of the composition "fiber – anatase", intended for use as an additive in the creation of self-cleaning plaster coatings was carried out. The fiber was treated with acids (nitric, acetic, formic) and thermal exposure at 550 °C, which simulates the conditions of sol-gel deposition of TiO2 on the carrier and synthesis of anatase. The criterion for evaluating changes in the properties of the surface of various fibers as a photocatalyst carrier was the nature of the distribution of adsorption sites in the area of Brensted acids. The positive effect on the activity of the fiber surface of the treatment modeling the process of sol-gel synthesis of PCM has been determined. The nature of the change in the total number of adsorption sites depending on the type of treatment and the type of fiber is established.

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The Structure of Cement Stone With Dispersed Titanium Dioxide in Daily Age

Cited by 3 publications

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Evaluation of the effectiveness of mineral additives in cement systems in the development of “core – shell” photocatalytic compositions

Evaluation of the effectiveness of mineral additives in cement systems in the development of “core – shell” photocatalytic compositions

Photocatalytic Active Self-Cleaning Cement-Based Materials. Compositions, Properties, Application

Acid-Base Properties of the Surface of Micro-Reinforcing Fibers as a Component of a Photocatalytic Composite Material for Plaster Mixes

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