Effect of Dispersions of Technical Carbon on Properties of Fine Concrete

Yakovlev, G.I.; Грахов, В П; Gordina, Anastasiya; Shaibadullina, A.V.; Saidova, Zarina; Nikitina, Svetlana V.; Begunova, E.V.; Elrefai, Ali Elsaed Mohamed Mohamed; Ooo, TM “PalIzh” “Noviy Dom”

doi:10.31659/0585-430x-2018-762-8-89-92

Cited by 5 publications

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“…According to paper [ 26 ], the use of soot and multiwall carbon nanotubes promotes a distribution of electrically conductive components in material structure that provides stable electrical characteristics without worsening the physical and mechanical properties [ 1 , 5 ].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Complex Modification on the Impedance of Cement Matrices

et al. 2021

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The research results presented in this article were obtained by joint scientific research on creatingcement materials with reduced impedance. It is known that functional additives added to impart electrically conductive properties have a negative impact on physical and mechanical characteristics of the material. This study suggests using the multiwall carbon nanotubes in the amount of 7% from binder mass as a functional additive. The results obtained prove that the addition of this amount of the modifier does not lead to a significant decrease of strength characteristics. Calcium nitrate in the amount of 1–7% was added in order to level the strength loss and to ensure the effective stable electrical conductivity. The multifunctionality of using this salt has been proven, which is manifested in the anti-frost and anticorrosive effects as well in enhancement of electrical conductivity. The optimal composition of the additive with 7% of carbon nanotubes and 3% of calcium nitrate ensures a reduced electrical impedance of cement matrix. The electrical conductivity was 2440 Ohm, while the decrease of strength properties was within 10% in comparison tothe control sample. The nature of changes in the microstructure were studied to determine the influence of complex modifications that showed significant changes in the morphology of the hydration products. The optimum electrical characteristics of cementitious materials are provided due to the uniform distribution of carbon nanotubes and the formation of a network of interconnected micropores filled with the solution of calcium nitrate that provides additional and stable electrical conductivity over time.

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Section: Introductionmentioning

confidence: 99%

The Effect of Complex Modification on the Impedance of Cement Matrices

et al. 2021

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“…The setting of favorable conditions for effective hydration can be reached by the application of ultrafine additives with high surface activity caused by their small size. Among such additives, it is possible to mention carbon-based nanomaterials such as carbon black [14][15][16][17], isostatic graphite [18][19][20], graphene oxide [21,22], graphene nanoplatelets [23,24], carbon nanotubes [25][26][27], and carbon fibers [28,29]. The listed additives possess several unique properties, such as high surface energy, mechanical strength, and electrical conductivity.…”

Section: Introductionmentioning

confidence: 99%

“…The listed additives possess several unique properties, such as high surface energy, mechanical strength, and electrical conductivity. The application of such additives for the modification of composites provides an improvement in the structure of the binding matrix and, consequently, leads to the improvement of different composite properties [14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

“…Monteiro et al [14], Nalon et al [15], and Dong et al [16] established the improvement of electrical properties of cement composites with CB, whereas the mechanical properties, as well as microstructure, were not deeply investigated. The study of the mechanical properties of modified cement mortar was carried out by Yakovlev et al [17]. Additionally, some researchers noted that the impact of CB on cement composites is comparable with the impact of carbon nanotubes, while the price of CB is lower [14,17].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Ultrafine Additives on the Morphology of Cement Hydration Products

et al. 2021

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The present research is focused on the investigation of the influence of ultrafine additives on the structure formation of hardened cement paste and the establishment of the mechanisms of the morphological transformations, which determine the properties of hydrated products. In the course of the research, the modification of ordinary Portland cement was performed by the suspension of multi-walled carbon nanotubes (MWCNTs), carbon black (CB) paste, and silica fume (SF). Scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) microanalysis, X-ray diffraction (XRD) analysis, thermal analysis, and Fourier-transform infrared (FTIR) spectroscopy were used to study cement hydration products. The morphology of hardened cement paste depends on the chemical reactivity of additives, their geometry, and their genesis. The action mechanism of the inert carbon-based additives and pozzolanic silica fume were considered. The cement hydration products formed in the process of modification by both types of ultrafine additives are described. In the case of the modification of cement paste by inert MWCNTs and CB paste, the formation of cement hydration products on their surface without strong adhesion was observed, whereas in the case of the addition of SF separately and together with MWCNTs, the strong adhesion of additives and cement hydration products was noted.

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“…Предварительные исследования, проведенные с использованием технического углерода в виде водной дисперсии [14,15], показали, что введение в бетонную смесь на основе портландцемента ультрадисперной сажи позволяет обеспечить плотную упаковку зерен цементной матрицы, улучшить межфазные контакты между матрицей и наполнителями, повысить прочность цементного бетона модифицированного дисперсией сажи. Учитывая полученные результаты на цементных матрицах, в данной работе приведены результаты исследований влияния дисперсии технической сажи на структуру и свойства гипсовых вяжущих.…”

Section: Introductionunclassified

Technical Carbon for Modification of the Structure and Properties of the Gypsum Binder

Yakovlev

Pervushin

Gordina

et al. 2019

Intellekt. Sist. Proizv.

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В работе приведены результаты исследований структуры и свойств гипсового вяжущего, модифицированного ультрадисперсной технической сажей. Показано, что введение в состав гипсового вяжущего технического углерода в виде колеровочной пасты приводит к изменению морфологии кристаллогидратов двуводного сульфата кальция, уплотнению структуры гипсовой матрицы и, как следствие, к повышению прочности затвердевшего гипсового вяжущего. Показано, что дисперсность частиц сажи в составе колеровочной пасты зависит от ее возраста. Проведено физическое моделирование твердения гипсового вяжущего с добавкой дисперсии сажи, которое позволило установить, что кристаллизация гипсового вяжущего происходит из центров кристаллизации, в качестве которых выступают частицы технического углерода. При этом существенно меняется морфология кристаллогидратов двуводного гипса с переходом ее из игольчатой к пластинчатой с повышенной плотностью структуры. С использованием растровой электронной микроскопии в сочетании с рентгеновским микроанализом и ИК-спектрального анализа обосновано изменение физико-механических характеристик гипсового вяжущего. Отмечается, достигнутые эффекты по степени модификации структуры гипсовой матрицы сопоставимы с результатами, получаемыми при модификации гипсового вяжущего дисперсиями углеродных нанотрубок, но при этом стоимость технической сажи существенно ниже стоимости углеродных нанотрубок.

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Effect of Dispersions of Technical Carbon on Properties of Fine Concrete

Cited by 5 publications

References 0 publications

The Effect of Complex Modification on the Impedance of Cement Matrices

The Effect of Complex Modification on the Impedance of Cement Matrices

Effect of Ultrafine Additives on the Morphology of Cement Hydration Products

Technical Carbon for Modification of the Structure and Properties of the Gypsum Binder

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