Fine-Grained Concrete with Nanodispersed Silica Additive

Лукутцова, Н П; Borovik, E.G.; Pehen'ko, Daniil

doi:10.4028/www.scientific.net/msf.992.156

Cited by 5 publications

(4 citation statements)

References 11 publications

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“…It is an inert mineral of the chain silicate subclass Ca3[Si3О9] of metamorphic origin. The use of this mineral in construction composites can significantly improve their properties [2][3][4][5][6][7]. Among natural minerals, wollastonite is distinguished by the ability of its surface hydrolysis when in contact with water, forming calcium hydroxide [8][9][10][11][12][13][14], thus providing an increased alkalinity and improving the corrosion resistance of the materials it is in [15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Effective Fine Concrete Modified with a Highly Dispersed Wollastonite-Based Additive

Karpikov

Лукутцова

Blagoder

et al. 2021

KEM

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An effective highly dispersed additive based on the wollastonite Miwoll 05-97 with an average particle diameter of 6.5 microns is obtained. A stable effect of interacting the additive components with Portland slag cement CEM II/A–Ш 42.5H is revealed; it results in improving the strength of fine-grained concrete produced with the raw materials mentioned above. It is established that using water suspension of wollastonite solid particles, highly water-reducing/superplasticizing modifier based on the polycarboxylate ether Master Glenium 430, as a stabilizer of the surface-active substance allows producing an additive with an evener distribution of solid particles in the liquid, and with stable functional properties. A highly dispersed wollastonite-based additive, obtained by ultrasonic dispersion for 10 minutes in the bath-type activator at the frequency of 35 kHz in the aquatic environment with a suspension stabilizer, enables producing the wollastonite-modified fine concrete with a compressive strength of more than 50 MPa, with the 10% additive being 2 times higher than that of the control.

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Section: Introductionmentioning

confidence: 99%

Effective Fine Concrete Modified with a Highly Dispersed Wollastonite-Based Additive

Karpikov

Лукутцова

Blagoder

et al. 2021

KEM

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“…It is possible to solve the problem of obtaining effective fine-grained concretes by using the modifying additives [2][3][4][5][6][7][8][9], due to their concrete structure and properties regulating effect [10][11][12][13][14][15][16][17]. A special part is assigned to dispersion-reinforcing additives [18][19][20], belonging to the group that regulates the properties of concretes and mortars in accordance with GOST 24211 [21].…”

Section: Introductionmentioning

confidence: 99%

Extreme Modelling of Concrete Optimal Composition and Content of the Components

Лукутцова

Pykin

Golovin

et al. 2021

KEM

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The optimal compositions of fine-grained concrete (FGC) with two-level reinforcement with fiber are determined via the extreme modelling of experimental data based on the Scilab engineering and scientific computing environment. At the macro level brass plated fibre of the wave profile FSW LV 15/0.3 made of steel grade 70-85 with the fiber length of 15 mm and the diameter of 0.3 mm was used for reinforcement. At the micro-level the halloysite nanotubes NN-RTE 200 with the particle sizes from 0.05 to 5 microns were applied. Having calculated the models the designed program Extr.sce determined the extrema of the required characteristics of fine-grained concrete Max_z and their coordinates max_x and max_y, corresponding to the contents of the brass plated fiber (x) and halloysite nanotubes additive (y). The graphic dependences of the compressive strength, bending strength and water absorption of fine-grained fiber concrete on the content of brass plated fibre and halloysite nanotubes additive with minimum, average and maximum cement content in it in the form of contour and 3d graphs of the interpolation surface are obtained. Two-level reinforcement of FGC, optimized by the program Extr.sce, proved that fine-grained concrete with 10% of brass plated fibre, 20% of halloysite nanotubes additives, and cement content of 600 kg had the maximum compressive strength of 70.26 MPa. In order to obtain FGC with maximum bending strength (17.43 MPa), there should be 5% of brass plated fibre, 10% of halloysite nanotubes additives, and 600 kg of cement in it. The fine-grained concrete without any reinforcement additives will have the minimum water absorption (3%).

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“…To keep the distribution of particles over the system volume unchanged over time, the use of surfactants capable of adsorbing at a solid phase-dispersion medium interface and stabilizing suspensions is the most effective [3][4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Study of the Suspension Stability of Titanium Dioxide of Anatase Modification for Self-Purifying Fine Concrete

Lukutsova

Efremochkin

Golovin

2020

SSP

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The suspension stability of the titanium dioxide of anatase modification, obtained by ultrasonic dispersion (USD) at the ultrasound frequency of 35 kHz in the aqueous medium of the stabilizer for self-purifying fine concrete as a finishing material for building envelope, is studied. The extreme dependence of the zeta potential on the ultrasonic dispersion parameters of titanium dioxide in the aqueous medium of the surfactant on the basis of sodium salts of naphthalene sulfonic acid and formaldehyde condensation products is established. Various variants of the sequence of the surfactant introduction into the titanium dioxide suspension are analysed. The ratio between TiO2 and the stabilizer, at which the zeta potential exceeds the threshold value of 30 mV and the suspension stability is maintained during 15 days, is determined. The optimal sequence of the suspension components introduction and the ultrasonic dispersion time are established. The influence mechanism of intermittent surfactant introduction on stabilization of the suspension of titanium dioxide of anatase modification is offered. The dependences of the fine concrete strength on zeta potential of the studied suspensions are obtained.

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Fine-Grained Concrete with Nanodispersed Silica Additive

Cited by 5 publications

References 11 publications

Effective Fine Concrete Modified with a Highly Dispersed Wollastonite-Based Additive

Effective Fine Concrete Modified with a Highly Dispersed Wollastonite-Based Additive

Extreme Modelling of Concrete Optimal Composition and Content of the Components

Study of the Suspension Stability of Titanium Dioxide of Anatase Modification for Self-Purifying Fine Concrete

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