Synthesis and characterization of SiO2-TiO2 nanoparticles and their effect on the strength of self-cleaning cement composites

Shchelokova, E. A.; Tyukavkina, V. V.; Tsyryatyeva, A.V.; Kasikov, А. G.

doi:10.1016/j.conbuildmat.2021.122769

Cited by 28 publications

(5 citation statements)

References 61 publications

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“…The increase in the compressive strength of the cement paste after 1 day of hardening is 26–29%, after 3 days 42–49%, after 28 days 38–41%, after 180 days 20–26%. [ 152 ].…”

Section: Results Of Mechanical Properties Of Modified Cement Mortarsmentioning

confidence: 99%

Photoactive Cements: A Review

Dudek

Janus

2022

Materials

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This article presents a short overview of modified cements with photocatalytic activity. First, the types and three main methods of obtaining photoactive cements are presented. The most frequently used modification method is the incorporation of a photocatalyst into the total mass of the cement. The second group analyzed is cements obtained by applying a thin layer of photoactive materials, e.g., paints, enamels, or TiO2 suspensions, using various techniques. The third group is cement mortars with a thick layer of photoactive concrete on the top. In addition, methods for determining the photoactivity of cement composites, mechanical properties, and physicochemical parameters of such materials are briefly presented. Finally, examples of investments with the use of photoactive cements and development prospects are shown.

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“…The increase in the compressive strength of the cement paste after 1 day of hardening is 26–29%, after 3 days 42–49%, after 28 days 38–41%, after 180 days 20–26%. [ 152 ].…”

Section: Results Of Mechanical Properties Of Modified Cement Mortarsmentioning

confidence: 99%

Photoactive Cements: A Review

Dudek

Janus

2022

Materials

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“…Mohamed [168] also highlighted the notable enhancement in the compressive strength of composite mixtures that incorporate both nano-SiO 2 and nano-clay, as opposed to mixtures containing only one type of nanoparticle. Shchelokova et al [169] investigated cement composites containing SiO 2 -TiO 2 (synthesized by heterocoagulation method). They reported that the temperature of calcination is a very influential factor on the important factors (the particle sizes, crystalline phase, surface area, and photocatalytic activity) of SiO 2 -TiO 2 .…”

Section: The Combined Use Of Nanomaterials In Concretementioning

confidence: 99%

A Critical Review Examining the Characteristics of Modified Concretes with Different Nanomaterials

Mohtasham Moein,

Rahmati,

Saradar

et al. 2024

Materials

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The movement of the construction industry towards sustainable development has drawn attention to the revision of concrete. In addition to reducing pollution, the use of nano-materials should lead to the provision of higher quality concrete in terms of regulatory items (workability, resistance characteristics, durability characteristics, microstructure). The present study investigates 15 key characteristics of concrete modified with nano-CaCO3, nano-clay, nano-TiO2, and nano-SiO2. The results of the study showed that nanomaterials significantly have a positive effect on the hydration mechanism and the production of more C-S-H gel. The evaluation of resistance characteristics also indicates the promising results of these valuable materials. The durability characteristics of nano-containing concrete showed significant improvement despite high dispersion. Concrete in coastal areas (such as bridges or platforms), concrete exposed to radiation (such as hospitals), concrete exposed to impact load (such as nuclear power plants), and concrete containing recycled aggregate (such as bricks, tiles, ceramics) can be effectively improved by using nanomaterials. It is hoped that the current review paper can provide an effective image and idea for future applied studies by other researchers.

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“…Например, в работе [95] авторы упоминают приложения для измерения цвета поверхностей пищевых продуктов [100], для выявления повреждений растений кукурузы [101], определения местоположения персонажей на изображениях сцен [102], автоматического мониторинга снежного покрова в Антарктиде [103], оценки гумусированности почв на основе обработки их цифровых фотоизображений [104; 105], простого анализа поровой структуры почв [106] и ряд других [107][108][109][110][111]. Отдельно отметим исследования сотрудников Института химии и технологии редких элементов и минерального сырья (ИХТРЭМС) КНЦ РАН, в которых с применением цифровых изображений изучена способность модифицированного титаносиликатной добавкой цементного камня к самоочищению под воздействием видимого и ультрафиолетового (УФ) света [112][113][114].…”

Section: взаимосвязь температуры и влажности материала хвостов обогащ...unclassified

“…После орошения образцы выдерживали в течение 12 часов. Затем измеряли температуру каждого образца и выполняли фотосъемку при естественном освещении и УФ-свете [112][113][114]. Понятно, что использование УФ-света возможно только в лабораторных экспериментах.…”

Section: взаимосвязь температуры и влажности материала хвостов обогащ...unclassified

Dusting of apatite-nepheline ores enrichment tailings: an environmental problem and pathways to solve it

Amosov,

Baklanov,

Goryachev

et al. 2023

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Studies of dusting of KB JSC “Apatit” enrichment tailings are presented. An assessment was made of the relationship between the meteorological parameters of the warm period and the tailings dusting intensity, which leads to an excess of MPC in Apatity, Murmansk region. An overview of the available methods for suppressing the dust particles emission during the operation of current and mothballed tailings dumps is presented. The results of new binding reagents testing are presented: in situ monitoring of the fixed surface state and laboratory studies of physical and mechanical properties, affecting the resistance to aggressive influences, as well as the effect of the binding reagents intake into recycled water on the technological parameters of apatite-nepheline ore flotation. It was shown that in addition to tailings dumps, transport and other industrial enterprises have a significant load on atmospheric air. The role of green zones within buffer zone, as well as in urban area was experimentally noted. An approach was tested (on a laboratory scale) for analyzing digital photographs of enrichment tailings material using RGB- and Lab-techniques to determine the quantitative relationship between temperature and humidity of the studied material. The results of computer simulation of both dusting at the ANOF-2 tailings dump and atmospheric pollution with a multi-dispersed impurity along the downward wind flow based on two- and three-dimensional CFD models. An assessment was made of the technological measures effectiveness to reduce the dusting intensity on the tailings dump beaches. The monograph is addressed to engineering and technical workers of the chemical industry, scientists, environmental practitioners, as well as citizens living in areas where mining and processing plants and interested in a clean atmosphere. It may be useful for students of higher educational institutions studying in chemical and environmental fields.

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Synthesis and characterization of SiO2-TiO2 nanoparticles and their effect on the strength of self-cleaning cement composites

Cited by 28 publications

References 61 publications

Photoactive Cements: A Review

Photoactive Cements: A Review

A Critical Review Examining the Characteristics of Modified Concretes with Different Nanomaterials

Dusting of apatite-nepheline ores enrichment tailings: an environmental problem and pathways to solve it

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