Improving the Cement Systems Corrosion Resistance Based on Clogging Theory

Rakhimbaev, Shark M.; Tolypina, N. M.; Khakhaleva, E. N.; Tolypin, D.A.

doi:10.4028/www.scientific.net/msf.974.26

Cited by 5 publications

(4 citation statements)

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“…Полифракционный гранулометрический состав многокомпонентной смеси способствует образованию полидисперсной структуры, в которой более мелкие частицы располагаются в пустотах крупных частиц, при этом обеспечивается минимизация пустотности пылевидной фракции, что положительно влияет на прочность образцов мелкозернистого бетона [3][4][5][6][7]. На практике пористая структура бетона устраняется увеличением расхода цемента либо вводом тонкодисперсных наполнителей, что обеспечивает заполнение пор новообразованиями или тонкодисперсными частицами наполнителя [8][9][10][11]. Однако выполнение данных требований приводит к удорожанию бетонов, так как стоимость дисперсных наполни-телей может в несколько раз превышать стоимость вяжущего, поэтому поиск дешевых наполнителей является актуальной задачей [12][13][14][15][16][17][18][19][20].…”

Section: влияние полидисперсного бетонного лома 3d-печати на структурообразование бетонаunclassified

The Effect of Polydisperse Concrete Scrap of 3d Printing on the Structure Formation of Concrete

Tolypina

Tolypin

2021

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

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The article considers the influence of polydisperse concrete scrap of 3D printing on the structure formation of concrete during its repeated application. It is established that the favorable effect on the strength is due to the presence of thin layers on the surface of the secondary fine aggregate in the form of hydrate phases that enhance adhesion to the forming cement matrix. At the same time, an important multifunctional role is played by a fine fraction consisting of a cement matrix with a small amount of pulverized clinker and quartz. It increases the volume of the binder part; performs the function of the centers of crystallization of hydrate phases; promotes the formation of a compact and homogeneous structure by filling the pores; increases the strength due to the hydration of the minerals alite and belite. It is shown that the minimization of the voidness of the fine-grained part of the concrete scrap is largely due to the polymodal grain composition, which contributes to the optimization of the structure of fine-grained concrete and increases the strength. The features of the microstructure of fine-grained concrete samples are established. Artificial conglomerate based on concrete scrap is characterized by a compact structure, due to the high adhesion of the fine aggregate to the cement matrix of concrete, filling the pores with hydrate phases and fine particles, in contrast to the samples of fine-grained concrete of the control composition, which structure is characterized by a weak contact zone between the aggregate and the cement matrix.

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Section: влияние полидисперсного бетонного лома 3d-печати на структурообразование бетонаunclassified

The Effect of Polydisperse Concrete Scrap of 3d Printing on the Structure Formation of Concrete

Tolypina

Tolypin

2021

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

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“…FarEastCon -Materials and Construction II carbonate rocks (marble and limestone) with positively charged active centers often prevailing [26].…”

Section: Impact Of Electrostatic and Dipole Forces On The Contact Zon...mentioning

confidence: 99%

Mechanism of Interaction between Concrete Cement Matrix and Mineral Additive Particles

Rakhimbaev

Logvinenko

2020

MSF

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A nature of the forces, which act between the concrete cement matrix and entrained mineral particles (ground additives, fine and coarse additives), has been considered. It has been shown that the adhesion between them is attributable to the forces of different nature. The strongest adhesion between the particles of the hydrated binding material and mineral additives occurs, when materials, which react with calcium hydrate of the pore fluid, are used. The latter includes glassy wollastonite, which is part of granulated blast furnace slag. Even at a temperature of 25 °C, an aggressive interaction between them is observed and firm chemical bonds occur. In such case, the dissociation energy of such bonds ranges from 400 to 500 kJ per bond. Between materials, such as crystalline wollastonite and the concrete cement matrix, there is an epitaxial coalescence of its basal surfaces and tobermorite calcium hydrosilicates formed by the interaction of the binder with water. A direct contact is required between the reacting surfaces for such interaction. This is implemented by virtue of the bond, which is attributable to contraction forces resulting from shrinkage strains of the hydrated particles in the concrete cement matrix. Internal strains of the cement that are attributable to contraction, shrinkage, and carbonization of hydrated compounds result in the cement sheath contracting around the aggregate grains and steel reinforcement. Internal strains of the cement stone can be calculated using the Lame equation. We have reviewed the role of the factors, which are most critical for contraction of the cement ring around coarse particles of the aggregate and for stress-strain properties of artificial conglomerates, which have different composition and purpose.

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“…Fiber concretes have enhanced deformation properties, primarily flexural tensile strength, low shrinkage deformations, and high abrasion resistance [ 8 ]. Having reviewed the scientific literature on hydrophysical indicators and the corrosion resistance of concrete, having become acquainted with the works of scientists in the field of building materials science on the investigation of the impact of various types of corrosion on the concrete matrix, and focusing on the peculiarities of the soils of Southern and Central Kazakhstan, we came to the conclusion that, in this work, it is necessary to investigate the indicators of corrosion resistance of modified SCC with the use of fiber reinforcement [ 7 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Hydrophysical Properties and Corrosion Resistance of Modified Self-Compacting Concretes

Zhagifarov,

Akhmetov,

Suleyev

et al. 2024

Materials

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Improvement of hydrophysical properties and corrosion resistance of self-compacting concrete to the effects of alternate freezing–thawing and aggressive soils of Southern and Central Kazakhstan is of interest to a wide range of researchers from the side of practical application of the obtained results in construction practice. It is proposed to form a spatially reinforced fine crystalline structure of a cement matrix with the maximum dense packing by using a complex modifier (hyperplasticizer + polymer + microsilica + fibro fibers) in the composition of self-compacting concretes (SCCs). The introduction of the calculated amount of the above additives increases the operational reliability of the current SCC compositions, increasing the water resistance to W16, frost resistance to F = 500, increasing the compressive strength by 20%, and reducing the mass loss of samples during corrosion leaching to 50%. It has been experimentally established that the proposed addition of the complex modifier (hyperplasticizer + polymer + microsilica + fibro fibers) to the SCC composition allows obtaining self-compacting concrete of high quality with improved performance characteristics (compressive strength, water resistance, frost resistance, and corrosion resistance). Studies have shown that the complex modifier-modified SCC compositions have a high degree of resistance in aggressive environments and leaching corrosion. Based on the results of the conducted tests, it is possible to recommend the obtained SCC compositions for the production of building products working in the zone of alternating freezing–thawing and aggressive soils.

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Improving the Cement Systems Corrosion Resistance Based on Clogging Theory

Cited by 5 publications

References 1 publication

The Effect of Polydisperse Concrete Scrap of 3d Printing on the Structure Formation of Concrete

The Effect of Polydisperse Concrete Scrap of 3d Printing on the Structure Formation of Concrete

Mechanism of Interaction between Concrete Cement Matrix and Mineral Additive Particles

Investigation of Hydrophysical Properties and Corrosion Resistance of Modified Self-Compacting Concretes

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