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Journal articles on the topic 'Fine grained concrete'

Author: Grafiati

Published: 4 June 2021

Last updated: 18 February 2022

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1

Tolstoy, A. "FINE-GRAINED HIGH-STRENGTH CONCRETE." Construction Materials and Products 3, no. 1 (July 8, 2020): 39–43. http://dx.doi.org/10.34031/2618-7183-2020-3-1-39-43.

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the article discusses the possibilities of improving the strength characteristics of fine-grained concrete. Modification of compositions and production technology of fine-grained high-strength concrete is possible with the use of natural and man-made raw materials of various chemical and mineral composition. It is shown that it is possible to increase the economic feasibility of high-strength fine-grained concretes with the preservation of performance characteristics due to the use of man-made raw materials and production waste. The issues of controlling the processes of structure formation and identifying a potentially stable state of hardening compositions are considered, possibly on the basis of modification and design methods for the composition of construction objects with improved properties.

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2

Lukutsova, N. P., G. N. Soboleva, S. N. Golovin, E. V. Chivikova, and E. V. Ogloblina. "Fine-Grained High-Strength Concrete." Materials Science Forum 945 (February 2019): 131–35. http://dx.doi.org/10.4028/www.scientific.net/msf.945.131.

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The factors determining the production of fine-grained high-strength concrete are considered. The effect of micro-and complex nanodisperse additives based on natural mineral components, as well as the packing density of the quartz aggregate, on the strength parameters of fine-grained concrete is studied. The compositions of the fine-grained concrete modified by micro-and complex nanodisperse additives have been developed. The dependence of the fine concrete strength on the ratio of the mineral component and the stabilizer in the nanodisperse additive and the time of ultrasonic dispersion and additive storage is analyzed. The stabilization mechanisms of water dispersions of complex nanodisperse additives by various surface active modifiers are considered. The positive role of ultrasonic dispersion in obtaining nanodispersed additives is shown. The application efficiency of the micro-filler improving the density and strength of fine-grained concrete is revealed. The structure of fine-grained concrete is studied. It has been established by scanning electron microscopy that the introduction of the micro-and nanodispersed additives in the concrete leads to a less defective crystalline structure of the material.

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3

Perfilov, V. A. "Modified Composite Fine-Grained Concrete." Defect and Diffusion Forum 410 (August 17, 2021): 829–34. http://dx.doi.org/10.4028/www.scientific.net/ddf.410.829.

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The paper presents the findings of the experimental investigation conducted to identify the effect of composite admixtures including a plastifying agent and soot production wastes on the proper-ties of fine grained concrete. The joint effect of the cement and sand matrix and soot wastes was investigated, too. The investigation identified the effect the complex admixture of a plastifying agent and soot wastes on structure formation, physical, mechanical properties and strength of the fine grained concrete. It was found that the micro particles of soot wastes concentrate the grains of the quartz sand around them as well as the products of the new formation of cement stone such as hydrated calcium silicate and others. This ensures a higher density of micro structure and increased strength of the fine grained concrete.

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4

Khezhev, Tolya, Aslan Kardanov, Eldar Bolotokov, Azamat Dottuyev, and Ibrahim Mashfezh. "Fine-Grained Fibre Concrete of Run-Of-Crusher Stone Using Volcanic Ash." Materials Science Forum 1043 (August 18, 2021): 61–65. http://dx.doi.org/10.4028/www.scientific.net/msf.1043.61.

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The results of the studies on the creation of self-compacting fine-grained fiber-reinforced concrete based on run-of-crusher stone with the use of a polyfunctional additive D-5 are presented. Compositions of self-compacting fine-grained fiber-reinforced concrete with the use of basalt fiber have been developed, which significantly reduce cement consumption and improve the characteristics of fine-grained concrete mixture and concrete. Using a polyfunctional additive D-5in mixtures makes it possible to increase the strength properties of fine-grained fiber-reinforced concrete while improving the concrete mixtures’ rheological characteristics. Replacement of cement up to 10% of the mass by ash fraction d<0.14 min fine-grained concrete mixtures does not cause a noticeable decrease in the concrete strength properties. The developed self-compacting fine-grained fiber-reinforced concretes have increased strength properties and have a low-cost price due to the use of local raw materials and run-of-crusher stone.

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5

Belov, Vladimir, Temur Barkaya, and Pavel Kuliaev. "Durability of fine-grained limestone concrete." E3S Web of Conferences 97 (2019): 02042. http://dx.doi.org/10.1051/e3sconf/20199702042.

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Production of effective building materials of high-density and high-durability is connected with the development of methods of modification of such materials on macro-, micro- and nanostructural levels. Presently the application of finest ingredients in admixture compositions such as limestone filler produced from local quarries is viewed as a primary task of cost reduction in limestone concrete manufacturing. The efficiency of limestone filler to enhance the durability of fine-grained limestone concrete is shown in tests performed. Limestone half inert filler conjointly with superplasticizer are found to enhance crack-resistance and reduces creep strains, which makes fine-grained limestone concrete the most effective and long-standing material. Knowledge of the stress-strain distribution in concrete with limestone fines under compression is important for the design of certain kinds of reinforced thin-walled concrete structures, such as shells, membranes and domes. These structures are manufactured with addition of both limestone filler and superplasticizer performing synergetic effect which leads to increasing a level of crack causing stresses.

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6

LUKUTTSOVA, N. P., R. A. EFREMOCHKIN, O. I. BORSUK, and S. N. GOLOVIN. "Photocatalytic Self-Cleaning Fine-Grained Concrete." Stroitel'nye Materialy 778, no. 1-2 (2020): 8–15. http://dx.doi.org/10.31659/0585-430x-2020-778-1-2-8-15.

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7

Solovyov, Vitaly, and Yulia Sokolova. "Fine-grained concrete with organomineral additive." MATEC Web of Conferences 86 (2016): 04045. http://dx.doi.org/10.1051/matecconf/20168604045.

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8

Fediuk, R., A. Pak, and D. Kuzmin. "Fine-Grained Concrete of Composite Binder." IOP Conference Series: Materials Science and Engineering 262 (November 2017): 012025. http://dx.doi.org/10.1088/1757-899x/262/1/012025.

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9

Anatolii, Vorokhaiev, Barabash Ivan, Ksonshkevych Liubov, Kos Zeljko, and Grynyova Iryna. "Fine-grained Fiber Concrete on Mechanoactivated Portlandcement." Croatian Regional Development Journal 2, no. 1 (June 1, 2021): 41–49. http://dx.doi.org/10.2478/crdj-2021-0007.

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Abstract This article is devoted to the study of the mechanical properties of fine-grained concrete used for flooring in industrial and civil buildings. Characterized by the well-known advantages (unlimited raw material base, manufacturability, high homogeneity), fine-grained concrete requires an increased consumption of cement to achieve the necessary mechanical characteristics - compressive strength, abrasion, impact resistance. An alternative to the known technological method is proposed an intensive separate technology (IST) for preparing fine-grained concrete mixtures using a high-speed mixer-activator in the presence of hydrophobized basalt fiber and a polycarboxylate superplasticizer Relaxol-Super PC. The use of IST leads to an increase in the strength of fine-grained concrete in compression by 1.9 times, impact resistance by a factor of 2, and a decrease in abrasion by 40... 50% in comparison with the control. The relevance of using the technology of monolithic floors for industrial and civil construction is due to a wide range of varieties of Portland cement, the grain composition of aggregates, as well as the simplicity of the technology for preparing a fine-grained concrete mixture.

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10

Poluektova, Valentina Anatolyevna. "Fine-Grained Polymer-Cement Basalt Fibrous Concrete for 3D Printing." Solid State Phenomena 299 (January 2020): 227–34. http://dx.doi.org/10.4028/www.scientific.net/ssp.299.227.

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The construction concrete printing requires new approaches at reinforcement performing. Only successful integration of the existing reinforcement systems will provide for the opportunity to design concrete structures and make objects with the help of additive technologies. The paper dwells upon the issues of possibilities and the efficiency of disperse reinforcement with basalt fibers. It presents a composition of a composite material for 3D printing of a type of fine-grained fibrous concretes with the required technological properties: a necessary plasticity and a high plastic strength for printing large-dimensioned items and structures without timbering by means of extrusion with a high material adhesion between the layers and controlled setting periods. The author studied a possibility to reclaim basalt fiber production wastes as a high-disperse fibrous filler for the reinforcement of polymer-modified concretes. The article provides the dependence of plastic strength on the fiber content in concrete. The authors consider the influence of components and the mechanism of modifying disperse particles of basalt fibrous concrete at obtaining the material for 3D printing. The obtained polymer-modified basal fibrous concrete has a good impact resistance, low water absorption and high crack resistance.

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11

Kapustin, F. L., and A. F. Kapustin. "Influence of Plasticizers on the Properties of Fine-Grained Polymer Concrete." Solid State Phenomena 299 (January 2020): 72–77. http://dx.doi.org/10.4028/www.scientific.net/ssp.299.72.

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Polymer concretes are used in construction, engineering, electrical and chemical industries. Polymer concrete mixes are characterized by low mobility mixtures, due to their high viscosity. It makes difficult to use them in the production of thin-walled and high-reinforced structures, monolithic floors, application of finishing and protective coatings and repairing of roads. The influence of additives of dibutyl-phthalate, chlorinated paraffin, technical glycerin and engine oil on the mobility of the concrete mix and the physical and mechanical properties of fine-grained concrete, based on polyester resin, was studied. For polymer concretes with different type and quantity of plasticizer the density and bending and compression strength were determined. To improve the workability of the concrete mix and obtain a polymer concrete with a homogeneous structure and high strength, it is recommended to use chlor-paraffin ChP-470A and “Lukoil” engine oil as a plasticizer.

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12

Belov, Vladimir, Pavel Kuliaev, and Temur Barkaya. "Ultrasonic modifications of fine-grained limestone concrete." IOP Conference Series: Materials Science and Engineering 869 (July 10, 2020): 032035. http://dx.doi.org/10.1088/1757-899x/869/3/032035.

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13

Lukuttsova, N. P., E. G. Borovik, and D. A. Pehenko. "Fine-Grained Concrete with Nanodispersed Silica Additive." Materials Science Forum 992 (May 2020): 156–61. http://dx.doi.org/10.4028/www.scientific.net/msf.992.156.

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The effect of the modifying nanodispersed silica (NS) additive, obtained by the polycondensation method, on the properties of fine-grained concrete (FGC) is studied. It is revealed that the dependence of the NS-additive particle size on its age is extreme. The maximum number of particles of up to 100 nm in the additive is observed at the age of 10 days, and then their number decreases. However, it affects the FGC strength little even after 30 days of the additive storage. It is established that the NS-additive could be most effectively used with 0.23% of an active silica concentration and pH 4.1 in combination with S-3. At that, the porosity declines from 17.5 to 12.9% and the pore diameter diminishes from 3.171 to 0.689 μm. It leads to an increase in the compressive strength by 2 times and a decrease in water absorption by 1.6 times as compared to the control composition without additives. An increase in the frost resistance of the modified fine-grained concrete to F250 is recorded; it occurs due to a decrease in porosity at portlandite binding with amorphous silica additives into low-basic calcium hydrosilicates.

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14

Endzhievskaya, I., N. Vasilovskaya, O. Gofman, A. Kozmin, and V. Grigoreva. "Fine-grained shotcrete-concrete with complex modifiers." Systems. Methods. Technologies, no. 2 (38) (2018): 164–69. http://dx.doi.org/10.18324/2077-5415-2018-2-164-169.

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15

Strokova, Valeria V., Igor V. Zhernovsky, Yulia V. Fomenko, and Natalya V. Makarova. "Regulation of Fine Grained Concrete Efflorescence Process." Applied Mechanics and Materials 357-360 (August 2013): 1300–1303. http://dx.doi.org/10.4028/www.scientific.net/amm.357-360.1300.

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The presented research focuses on the investigation of the efflorescence process and its structure and morphology. It aims at the development rational methods to prevent the efflorescence risk, taking into account the specifics of fine grained concrete paving blocks.

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16

Tang, Van Lam, and Boris Igorevich Bulgakov. "RESEARCH OF ADHESIVE STRENGTH OF NEW CONCRETE LAYER WITH A SURFACE OF OLD CONCRETE." Vestnik MGSU, no. 4 (April 2016): 76–83. http://dx.doi.org/10.22227/1997-0935.2016.4.76-83.

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Concrete is a material very commonly used in modern construction, each year over 4 billion m3 of concrete is used around the world. In the recent years high-quality fine grain and other types of concrete allow giving the modern creation city buildings new architectural expressivity, meeting the requirements of the XXI century. The trend of using of these new types of concrete is also applied in the construction of tunnel systems and the subway. The fine-grained high performance concrete obtained by using a mixture of organo-mineral additives and fiber reinforcement, compares fovourably with ordinary fine-grained concrete, namely its bending and tensile strength is higher, it has good resistance to shock impacts and fatigue, as well as crack resistance, water resistance and resistance to erosion. So this type of fine-grained high performance concrete is suitable for the construction of subway tunnels and other special objects. When evaluating the concrete performance in underground rock layers subjected to complex mechanical forces, it is important to take into account the stress of metro upon departure and stopping at the stations. The article presents a new experimental method of determining the adhesion strength of fine-grained high performance concrete layer freshly poured on the surface of old concrete in the process of construction and repair of underground. The result of this method application showed that fine-grained high performance concrete is capable of skid resistance higher than 55 % compared to regular fine-grained concrete without additives.

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17

Bilek, Vlastimil, Michal Pešata, and Lukáš Procházka. "High Performance Fine Grained Concrete with Content of Pumice." Solid State Phenomena 309 (August 2020): 21–25. http://dx.doi.org/10.4028/www.scientific.net/ssp.309.21.

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Pumice is a volcanic rock that consists of a highly vesicular rough textured volcanic glass. It is very porous and shows a high absorption - it can contain a lot of water. Thanks to its low volume density, it is sometimes used as a light natural aggregate, especially for some small elements such as chimney blocks. The paper is focused on the development of concretes and mortars for these purposes. The optimum content of pumice was specified from the point of view of mechanical properties. Special attention was paid to absorbed water - it can be a source of self-curing of concrete.

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18

Balabanov, Vadim, and Ksenia Putsenko. "Modification of fine-grained polymer concrete with microsilica." MATEC Web of Conferences 212 (2018): 01010. http://dx.doi.org/10.1051/matecconf/201821201010.

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At present, one of the most promising areas in construction is the modification of concrete by means of a complex of modifying additives and production wastes that will allow to obtain concrete with improved technical and operational characteristics and solve a number of problems: import substitution and nanotechnology. The aim of scientific research is the development of new technologies for obtaining concrete with enhanced performance characteristics, provided that raw materials, energy and labor costs are minimized. The article presents the results of research work on the development of fine-grained polymer concrete, modified with microsilica. In the framework of the study, a literature review for the last 68 years has been conducted, devoted to the experience of using microsilica and polymers in concrete construction as a modifier for building materials. The main characteristics of the starting materials and modifying additives are determined. A study was conducted to determine the effect of various modifying additives on the physicomechanical characteristics of fine-grained concrete. The main rheological properties and strength characteristics of the entire spectrum of the investigated compositions are determined. A microscopic study of the structure was carried out. The result of scientific research is the establishment of an optimal combination of additives, the development of cement concrete with the use of microsilica and acrylic dispersion and the determination of the effect of additives on the physical and mechanical properties.

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19

Parashchuk, Lidiya, Viktoria Kochubei, Petro Novosad, Bohdan Seredyuk, and Andriy Hamarnik. "Modified fine-grained concrete for floor heating system." French-Ukrainian Journal of Chemistry 8, no. 1 (2020): 133–41. http://dx.doi.org/10.17721/fujcv8i1p133-141.

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This work shows the influence of components and hardening conditions on linear shrinkage of fine-grain concrete. The floor heating system is one of the most popular options of the heating system these days. The possibility of using this composition for screed for floor heating system is shown. A method of enhancing of strength of the concrete by adding reinforcing fibers and plasticizer has been suggested. Concrete composition has been optimized.

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20

Skripnikova, N. K., V. V. Shekhovtsov, D. K. Grigorevskaya, M. A. Semenovykh, and I. Yu Yur'ev. "SMALL-GRAIN CONCRETE BASED ON METALLURGY WASTE." Vestnik Tomskogo gosudarstvennogo arkhitekturno-stroitel'nogo universiteta. JOURNAL of Construction and Architecture, no. 2 (April 29, 2019): 185–91. http://dx.doi.org/10.31675/1607-1859-2019-21-2-185-191.

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The paper presents the approach to the metallurgical waste recycling introducing them into the composition of fine-grained concretes. Blast-furnace produced by OOO „EVRAZ ZSMK‟ is used as a recyclable waste. According to the X-ray diffraction patterns, the blast-furnace is mainly represented by such components as iron and calcium hydrated silicates, quartz, calcite and carbon. It is found that during the hydrothermal treatment of fine-grained concrete, carbonate-containing additives facilitate the formation of hydrated calcium silicates containing carbonate groups the composition of which is close to the that of hydrosilicate phases. The formation of these products in the concrete production contributes to the strength properties improvement in the material obtained and reduces the possibility of late formation of similar phases during its service. This minimizes the carbon dioxide corrosion and shrinkage deformation accompanying this process. It is shown that the use of blast-furnace as fine aggregate in the concrete mix increases the material density and strength by 14 % and 11.2 %, respectively. The water absorption decreases by 5 %, which positively affects the frost resistance of finegrained concretes. The obtained fine-grained concrete provide can be used to produce the M250 concrete grade.

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21

Klyuev, Sergey V., A. V. Klyuev, and E. S. Shorstova. "The Micro Silicon Additive Effects on the Fine-Grassed Concrete Properties for 3-D Additive Technologies." Materials Science Forum 974 (December 2019): 131–35. http://dx.doi.org/10.4028/www.scientific.net/msf.974.131.

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The effectiveness of silica fume for the fine-grained concrete used for 3-D technologies is proved in the give scientific paper. The advantages of silica fume using for concretes are presented. The mathematical modeling is used for the fine-grained concrete high-quality compositions’ development. The effectiveness of silica fume has been proved by the studies. The increase in the strength characteristics of concrete with the addition of silica fume is explained by the active pozzolan reaction, which starts when the concrete mix is mixed with water.

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22

Parfenov, Sergey, Anatoly Alekseytsev, and Yuriy Vinokurov. "Fine grained concrete structures reliability assessment: theory and investigational studies." MATEC Web of Conferences 251 (2018): 02002. http://dx.doi.org/10.1051/matecconf/201825102002.

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Describes the theoretical preconditions of using mechanical properties of fine-grained concrete in the design of concrete structures subject to risks and the general safety. A technique for experimental studies and data on the fine-grained concrete deformative properties at different ages and different loading levels are presented. The regularities of the modulus of elasticity change from strength, type and age of concrete are revealed. Full diagrams of deformation of concrete are constructed. The results obtained can be used in the design of the fine-grained concrete structures in buildings having risks occurrence socioeconomic losses and able to resist of emergency actions.

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23

Belov, V. V., P. V. Kuliaev, and A. A. Artemiev. "Fine-grained limestone concrete with improved dissipative properties." IOP Conference Series: Materials Science and Engineering 709 (January 3, 2020): 044050. http://dx.doi.org/10.1088/1757-899x/709/4/044050.

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24

Pyataev, Eugene, Vyacheslav Semenov, Elen Bilonda Tregubova, and Denis Kirushok. "Fine-grained concrete modified with a multifunctional additive." IOP Conference Series: Materials Science and Engineering 869 (July 10, 2020): 032050. http://dx.doi.org/10.1088/1757-899x/869/3/032050.

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25

Kholmyansky, M., E. Kogan, and K. Kovler. "On the hardness determination of fine grained concrete." Materials and Structures 27, no. 10 (December 1994): 584–87. http://dx.doi.org/10.1007/bf02473127.

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26

SHCHEPOCHKINA, J. A. "MODIFICATION OF FINE-GRAINED CONCRETE ADDITIVES CRUSHED PLASTIC." Building and reconstruction 89, no. 3 (2020): 131–36. http://dx.doi.org/10.33979/2073-7416-2020-89-3-131-136.

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27

Shyshkina, Alexandra A., and Аlexander А. Shyshkin. "FINE-GRAINED CONCRETE FOR REPAIR OF HYDRAULIC STRUCTURES." Shipbuilding & marine infrastructure 14, no. 2 (2020): 30–37. http://dx.doi.org/10.15589/smi2020.2(14).3.

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28

Beshtokov, Beslan, Aues Tsipinov, Marita Mashukova, Astemir Ozrokov, and Timur Tokmakov. "Fine-Grained Lightweight Concrete from Volcanic Tuffsawing Waste." Materials Science Forum 1043 (August 18, 2021): 115–20. http://dx.doi.org/10.4028/www.scientific.net/msf.1043.115.

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29

Anisimov, Sergey, and Olga Kononova. "Self-compacting fine-grained concrete for reinforced concrete frame joints filling." IOP Conference Series: Materials Science and Engineering 365 (June 2018): 032050. http://dx.doi.org/10.1088/1757-899x/365/3/032050.

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30

Tekle, Biruk Hailu, Dennis Messerer, and Klaus Holschemacher. "Bond induced concrete splitting failure in textile-reinforced fine-grained concrete." Construction and Building Materials 303 (October 2021): 124503. http://dx.doi.org/10.1016/j.conbuildmat.2021.124503.

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31

Goncharova, Margarita A., V. V. Simbaev, and O. V. Karaseva. "Optimization of Fine-Grained Concrete Composition in Order to Improve the Quality of Units’ Front Surface." Solid State Phenomena 284 (October 2018): 1052–57. http://dx.doi.org/10.4028/www.scientific.net/ssp.284.1052.

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In this article, the results of optimizing fine-grained concretes are given. Laboratory tests were conducted to obtain a high-quality front surface of products formed according to two different methods. Special focus was given to the rheological characteristics of concrete mixture which make the biggest impact on the front surface quality class of units produced from modified fine-grained concretes.

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32

Tolypina, N., and D. A. Tolypin. "THE EFFECT OF POLYDISPERSE CONCRETE SCRAP OF 3D PRINTING ON THE STRUCTURE FORMATION OF CONCRETE." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 6, no. 7 (July 10, 2021): 17–23. http://dx.doi.org/10.34031/2071-7318-2021-6-7-17-23.

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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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33

Baranova, Albina, Margarita Badenikova, Pavel Shustov, Christina Rudykh, and Anna Bobrova. "Light fine-grained fibrous concrete for small architectural forms." MATEC Web of Conferences 212 (2018): 01008. http://dx.doi.org/10.1051/matecconf/201821201008.

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The selection of the composition of a highly mobile concrete mixture for manufacturing small architectural forms has been performed, and the strength characteristics of light fine-grained fibrous concrete have been studied. It has been experimentally established that the optimal ratio of the Portland cement to microsilica is 1: 1. The introduction of basalt fiber in the amount of 0.5% of the mass of solids contributes to the increase in bending strength of fine-grained concrete to 70%.

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34

Skarzynski, Ł., and J. Tejchman. "Numerical Mesoscopic Analysis of Fracture in Fine-Grained Concrete." Archives of Civil Engineering 58, no. 3 (September 1, 2012): 331–61. http://dx.doi.org/10.2478/v.10169-012-0019-7.

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Abstract This paper presents numerical two-dimensional results for fine-grained concrete under quasi-static three-point bending at meso-scale. Concrete was modelled as a random heterogeneous three-phase material. The simulations for notched concrete beams were carried out with the standard finite element method using an isotropic damage constitutive model enhanced by a characteristic length of micro-structure by means of a non-local theory. The effect of the volume fraction, shape, size, statistical distribution and stiffness of aggregate was analysed. Moreover, the effect of the bond thickness, notch size and characteristic length of micro-structure on the material behaviour was numerically investigated. The FE results were compared with own laboratory test results and other meso-scale calculations for three-phase concrete elements.

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35

Belov, Vladimir, Pavel Kuliaev, and Temur Barkaya. "Carbonate fine- grained concrete with enhanced internal energy dissipation properties." MATEC Web of Conferences 329 (2020): 04005. http://dx.doi.org/10.1051/matecconf/202032904005.

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In this paper, research is carried out in the field of application of carbonate fine filler and hyper- and superplasticizers for enhancing micro- level energy dissipation in fine-grained concrete. The joint effect of a hyper- and superplasticizing additive including limestone microfiller on the mechanical properties of fine-grained carbonate concrete has also been studied. The main parameter of concrete properties considered in this paper is stress intensity factor. It is determined in conducting incongruent tests of concrete samples-prisms for bending in accordance with the present standard.

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36

Vyšvařil, Martin, and Markéta Rovnaníková. "Sulfuric Acid Attack on Various Types of Fine Grained Concrete." Advanced Materials Research 1100 (April 2015): 101–5. http://dx.doi.org/10.4028/www.scientific.net/amr.1100.101.

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Sulfate corrosion is one of the major threats for durability of concrete constructions and it becomes a major destructor in sewage collection systems where the concrete sewer pipes are exposed to sulfates from wastewater as well as from biogenic activity of bacteria. During this process the pH of the surface of concrete sewer pipes is reduced and it may lead to steel depassivation and results in the corrosion of this steel reinforcement. This paper is focused on the sulfate attack on fine grained concrete where the effect of 0.5% sulfuric acid, simulating biogenic sulfuric acid corrosion, on changes of pH and content of sulfates in various types of concrete has been investigated. After 3 and 6 months of the corrosive treatment, the content of sulfate ions and pH values in several layers of specimens were determined. It was found that the sulfate ions penetrate into concrete to the maximum depth of 20 mm and the pH of the aqueous leaches of particular layers of the samples was reduced to 11.4 at the most. Thus, the conditions for the depassivation of reinforcement were not met. The GL and GBFS concrete samples showed the least changes of their pH and therefore they had the best resistivity to the six months sulfate attack.

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Gerasimova, Ekaterina S., and Elizaveta Gumirova. "Influence of “MC-Bauchemie” Additions on the Fine-Grained Concrete Properties." Solid State Phenomena 309 (August 2020): 114–19. http://dx.doi.org/10.4028/www.scientific.net/ssp.309.114.

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The paper is devoted to research of influence of “MC-Bauchemie” additions on the fine-grained concrete properties, namely compressive strength. The results of testing of fine-grained concrete made on the basis of two different natural sands are presented. Characteristics of the initial materials used in the work (Portland cement, sands and additions-plasticizers) are given. The basic methods of preparation of mixes and testing of hardened cement stone and concrete are described. The optimal quantity of the selected additions on the example of cement paste and stone are established. Mobility dependences of concrete mixes on a type and quantity of plasticizers are received. The dependence of the additions effectiveness on the mobility of the concrete mix on the quality of the fine aggregate is shown. It is established that the most effective additive is PowerFlow 3100, its optimal amount for obtaining fine-grained concrete on the basis of JSC “Kar’er Myisyi” sand is 0.2 %.

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Shyshkina, Alexandra, and Alexander Shyshkin. "Fine-Grained Concrete for Repair and Restoration of Building Structures." Materials Science Forum 1038 (July 13, 2021): 317–22. http://dx.doi.org/10.4028/www.scientific.net/msf.1038.317.

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It is determined that the active components of modern concrete are active mineral fillers, such as microsilica, meta-kaolin, ash-bearing or compositions from them, as well as superplasticizers. The optimal combination of these additive modifiers allows you to control the rheological properties of concrete mixtures and to modify the structure of the cement stone in such a way as to provide concrete properties that provide high operational reliability of structures. However, they have certain disadvantages that hamper their widespread use. The purpose of the research is to determine the effect of reaction powders applied simultaneously with colloidal surfactant, on the strength of powdered concrete and the rate of its formation.

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Klyuyev, A. V., D. M. Sopin, A. V. Netrebenko, and S. A. Kazlitin. "Heavy loaded floors based on fine-grained fiber concrete." Magazine of Civil Engineering 38, no. 3 (April 2013): 7–14. http://dx.doi.org/10.5862/mce.38.1.

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Udodov, Sergey, Yuriy Galkin, and Philip Belov. "Mechanical and physical properties of fine-grained concrete for concrete additive manufacturing." E3S Web of Conferences 91 (2019): 02041. http://dx.doi.org/10.1051/e3sconf/20199102041.

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Additive manufacturing (3D printing) is becoming more and more common in the field of modern construction. However, for wider implementation of this technology, it is necessary to solve a number of material-oriented scientific problems related to development of concrete composition with targeted rheological, stress-strain, physical and mechanical properties. It has been established that time periods between successful applications of layers play the crucial role in ensuring monolithic features of the “printed” structures. Application of mathematics planning of the experiment allowed establishing the main principles of formation of basic physical and mechanical properties of fine-grained concrete depending on material composition.

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Tang Van, Lam, Dien Vu Kim, Hung Ngo Xuan, Doan Tung Lam Nguyen, Boris Bulgakov, and Sophia Bazhenova. "Combined effect of limestone fine aggregate and pozzolan on properties of high performance fine-grained concrete." E3S Web of Conferences 97 (2019): 02004. http://dx.doi.org/10.1051/e3sconf/20199702004.

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This paper used the absolute volume method combined with the experiment to determine the compositions of high performance fine-grained concrete (HPFC) and presented the effect of limestone fine aggregate (LFA) and pozzolan (PU) on the HPFC properties. Test results showed that by increasing the LFA and PU, the workability of the concrete mixture decreased, the maximum slump loss after 90 minutes of mixing was 37.84%, whereas the mechanical properties of HPFC increased. The fine-grained concrete mixture containing 40% PU and LFA completely replaced material for natural sand, the compressive strength of concrete at 28-day increased about 23.87% in comparison to the control mixture. By using the standard NT Build 356, the destruction time of the four specimens tested was of 45, 63, 60 and 61 days, respectively. This result is due to the presence of PU increased the volume of the C-S-H, as well as the density of concrete structure and enhanced the strength of HPFC, thus increased destruction time of specimens used for the assessment of corrosion damage of reinforced in the concrete. The results of the current study support the use of the waste limestone from the quarries as a fine aggregate of green concrete in the future.

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Vyšvařil, Martin, and Markéta Rovnaníková. "One-Year Sulfate Attack on Various Types of Fine Grained Concrete." Advanced Materials Research 1124 (September 2015): 313–18. http://dx.doi.org/10.4028/www.scientific.net/amr.1124.313.

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Concrete shows extensive degradation when exposed to the external sulfate attack, characterized by ingress of sulfate ions from surrounding medium. This process leads to gradual pH decrease, to expansion, cracking, spalling of concrete, and finally to the complete disintegration of the material. Sulfate attack becomes a major destructor in sewage collection systems where the concrete sewer pipes are exposed to sulfates from wastewater as well as from biogenic activity of bacteria. This paper is focused on the sulfate attack on fine grained concrete where the effect of 0.5% sulfuric acid, simulating biogenic sulfuric acid corrosion, 5% sodium sulfate solution and solution simulating sewage water on various types of concrete has been investigated. The concrete specimens were characterized after exposition to corroding media by their mechanical parameters, microstructure and in the case of H2SO4 as the most aggressive corroding solution, the mineralogical composition was also determined by XRD analysis. It was found that the exposition to Na2SO4 solution twofold improved flexural strengths of concrete mixes based on Portland and sulfate-resisting cements. Contrary, the exposition to H2SO4 solution significantly decreased compressive strengths of all types of concrete.

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Zajceva, Ljajsjan, Ekaterina Lucyk, Tat’jana Latypova, Valerij Latypov, Pavel Fedorov, and Madina Salamanova. "Influence of the Type of Aggregate from Industrial Waste on Corrosion Resistance of Modified Fine-Grained Concrete." Buildings 11, no. 8 (August 14, 2021): 352. http://dx.doi.org/10.3390/buildings11080352.

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The development and implementation of “green” technologies in the construction sector, which ensure natural resource conservation, reduce harmful emissions and provide utilization of industrial waste, are key issues in material engineering of the XXI century. Extensive research has been devoted to solving these issues, including research in the field of concrete science. Still, the issue of developing concrete compositions with increased corrosion resistance remains much less studied. At the same time, reactive aggregates from industrial waste can have positive effect on durability of concrete, and the best result can be achieved by means of modification of a concrete mixture with highly effective additives. The article presents the research data in two lines—the study of applicability of reactive aggregates from waste products of nonmetallic and ceramic industries, mineral wool production and concrete scrap for production of corrosion-resistant concretes, as well as the assessment of possibility of Portland cement quantity reduction in a concrete mixture on local raw materials due to the introduction of additives based on polycarboxylates. The article presents the research evidence of the effect of dust and clay particles content on the quality of concrete with a polycarboxylate additive. The article describes the studies of corrosion resistance of concrete samples based on production wastes in sulfate environments and under the influence of carbon dioxide. The developed concrete compositions with waste use can be recommended for widespread application, rational use of resources, and production of durable high-quality concretes. The application of additives based on polycarboxylates makes it possible to produce concretes with the reduction of cement consumption in the mixture by 10–20% and decrease in the mode of thermo-wet treatment by two times.

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Abdykalykov, A., M. Dzhusupova, Nadia Antoniuk, and Aidai Talantbek Kyzy. "Ensuring Strength of Fine Grained Concrete with Mixed Cement Binders." Key Engineering Materials 864 (September 2020): 134–40. http://dx.doi.org/10.4028/www.scientific.net/kem.864.134.

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The article presents the results of the evaluation of the strength of fine-grained concrete of ordinary grades on mixed cement binders with ash and slag waste of thermal power plants. To ensure the required strength, the preliminary activation of the mixed binder was envisaged, which is one of the main techniques for reducing cement consumption. Experimental-statistical models of the strength properties of fine-grained concrete was obtained, which make it possible to predict the required strength with a minimum consumption of cement and the optimal concentration of ash in the binder.

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Айменов, Ж. Т., А. Ж. Айменов, and И. З. Кашкинбаев. "CONSTRUCTION AND TECHNICAL PROPERTIES OF FINE-GRAIN STRESS CONCRETE JOINTS." Вестник ГГНТУ. Технические науки, no. 4(22) (December 25, 2020): 36–43. http://dx.doi.org/10.34708/gstou.2020.19.91.005.

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В работе приведены результаты исследований по проектированию составов мелкозернистых бетонов на напрягающем цементе для замоноличивания стыков труб. Задачей исследования явилось получение материала заделки стыков с заданными физико-механическими свойствами. Для этого были определены оптимальные составы мелкозернистых бетонов на напрягающих цементах и условия получения материала, удовлетворяющего требованиям, предъявляемым к бетонам заделки стыков бетонных труб, закрытых водоподающих систем. Исследования проводились на экспериментальных установках. Установлено, что мелкозернистые бетоны на основе напрягающегося цемента обладают особо плотной структурой, обусловливающей их высокую непроницаемость, также повышенную трещиностойкость благодаря наличию в них самонапряжения. Высокая непроницаемость обусловлена его слабо пористой структурой, округлой изометричной формой пор, отсутствием неплотностней между заполнителем и цементом. Исследованиями установлено, что путем изменения водоцементного отношения, расхода напрягающего цемента и песка можно регулировать структуру напрягающего бетона. The paper presents the results of studies on the design of compositions of fine-grained concrete on tensile cement for monolithic pipe joints. The objective of the study was to obtain material for sealing joints with specified physical and mechanical properties. For this, the optimal compositions of fine-grained concrete on tensile cements were determined from the conditions for obtaining a material that meets the requirements. Presented to concretes for sealing joints of concrete pipes of closed water supply systems. The studies were carried out in experimental facilities. It was established that fine-grained concrete based on tensile cement has a particularly dense structure, which determines their high impermeability, as well as increased crack resistance due to the presence of self-stress in them. High impermeability is due to its weakly porous structure with a rounded isometric pore shape, the absence of leaks between the aggregate and cement. Studies have found that by changing the water - cement ratio, the flow rate of the cement and sand, the structure of the concrete can be adjusted.

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Klyuev, Sergey, Alexander Klyuev, and Nikolai Vatin. "Fine-grained concrete with combined reinforcement by different types of fibers." MATEC Web of Conferences 245 (2018): 03006. http://dx.doi.org/10.1051/matecconf/201824503006.

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The article deals with the application of combined reinforcement of fi-ne-grained concrete with steel wave and polypropylene fibers. High-density packaging of the mixture components was used to improve the strength and deformation characteristics. In order to reduce the cost of fibre concrete, composite binders were developed. Rational selection of filler and the use of a steel wave fiber gave the opportunity to get the fibre concrete with tensile compressive strength – 84.8 MPa, the tensile strength in bending – 19.8 MPa on technogenic sands of the Kursk Magnetic Anomaly. With combined reinforcement by steel and polypropylene fiber on technogenic sands of the Kursk magnetic anomaly fibre concrete with a tensile compressive strength – 82.8 MPa, in bending – 19.1 MPa was developed. With the same strength charac-teristics the developed mixture of fibre concrete based on combined re-inforcement due to reducing the amount of steel fiber at cost is lower by 25% compared to the composition on steel fiber and the same com-posite binder.

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Rakhimbayev, Shark M., Natalia M. Tolypina, Elena N. Khakhaleva, and Daniil A. Tolypin. "Comparative Resistance of Concrete with Aggregates and Fillers of Different Composition." Materials Science Forum 1017 (January 2021): 133–42. http://dx.doi.org/10.4028/www.scientific.net/msf.1017.133.

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The paper studies the influence of aggregates and fillers with negative and positive electrical surface properties on the corrosion resistance of concrete. The advantage of resistance of fine-grained concrete on marble sand in comparison with concrete on quartz sand, regardless of the type of aggressive environment, is established. At the same time, the stability of samples of powdered concrete with 10 and 30% of fine-grained filler changed little when replacing the quartz powder with marble one. It is shown that the resistance coefficients of powdered concrete samples with quartz filler (10%) do not differ from the resistance coefficients of samples of a similar composition with crushed marble filler, and with an increase in the dosage of the filler (30 %) slightly exceed. It was found that in powder concretes without aggregates, the contact layer between the cement matrix and the aggregate is absent, so the composition of the mineral powder plays a much smaller role in the corrosion processes of cement stone. The obtained results allowed establishing that electrokinetic phenomena play a secondary role, and the main influence on the stability of fine-grained concrete is the processes of pore colmation by chemical reactions, as well as the interaction of the surface layers of the aggregate with the cement matrix.

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Rakhimbayev, Shark M., Natalia M. Tolypina, Elena N. Khakhaleva, and Daniil A. Tolypin. "Comparative Resistance of Concrete with Aggregates and Fillers of Different Composition." Materials Science Forum 1017 (January 2021): 133–42. http://dx.doi.org/10.4028/www.scientific.net/msf.1017.133.

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The paper studies the influence of aggregates and fillers with negative and positive electrical surface properties on the corrosion resistance of concrete. The advantage of resistance of fine-grained concrete on marble sand in comparison with concrete on quartz sand, regardless of the type of aggressive environment, is established. At the same time, the stability of samples of powdered concrete with 10 and 30% of fine-grained filler changed little when replacing the quartz powder with marble one. It is shown that the resistance coefficients of powdered concrete samples with quartz filler (10%) do not differ from the resistance coefficients of samples of a similar composition with crushed marble filler, and with an increase in the dosage of the filler (30 %) slightly exceed. It was found that in powder concretes without aggregates, the contact layer between the cement matrix and the aggregate is absent, so the composition of the mineral powder plays a much smaller role in the corrosion processes of cement stone. The obtained results allowed establishing that electrokinetic phenomena play a secondary role, and the main influence on the stability of fine-grained concrete is the processes of pore colmation by chemical reactions, as well as the interaction of the surface layers of the aggregate with the cement matrix.

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Buravchuk, N. I., and O. V. Guryanova. "Fine-grained concrete based on technogenic raw materials for road surfaces." Innovatics and Expert Examination, no. 1(31) (June 18, 2021): 152–59. http://dx.doi.org/10.35264/1996-2274-2021-1-152-159.

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On the basis of technogenic raw materials – ash and slag waste and burnt rocks of mine dumps – the compositions of fine-grained concrete were selected. The developed compositions have been tested in the manufacture of pilot batches of paving slabs. The introduction of fly ash and crushing screenings of burnt rocks into the composition of concrete improves the physical and mechanical properties of products with significant savings in cement. The applicability of the investigated technogenic raw materials in fine-grained concrete, intended for the manufacture of paving slabs and road paving elements, has been proved. Products have high indicators of physical and mechanical properties and quality.

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Vyšvařil, Martin, and Markéta Rovnaníková. "Study of Fine-Grained Composites Exposed to Sulfuric Acid and Sodium Sulfate." Applied Mechanics and Materials 827 (February 2016): 275–78. http://dx.doi.org/10.4028/www.scientific.net/amm.827.275.

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The degradation of concrete due to ingress of sulfate ions from the environment plays an important role in the durability of concrete constructions, especially in sewage collection systems where concrete sewer pipes are exposed to sulfates from waste water and from biogenic activity of bacteria. During this process the pH of the surface of concrete sewer pipes is reduced and it may lead to the steel depassivation and results in the corrosion of steel reinforcement. Damage due to sulfate interaction can result in the cracking and softening, with loss of strength of concrete. This paper is focused on the sulfate attack on fine-grained concrete where the effect of one-year contact of 0.5% H2SO4, and 5% Na2SO4 on changes of pH and content of sulfates in 7 types of concrete has been analyzed. It was found that after one year of sulfate attack on concrete, significant growth of content of sulfates is observed in the lowermost layer of the samples. Samples treated by 5% Na2SO4 contain slightly more sulfates in the upper layers than samples treated by sulfuric acid. The reduction in pH of aqueous leaches occurred in all layers of the samples. However, even in the lower layers of the samples, the reduction of pH below 9.5 did not turn up (except for SRS sample), and thus the conditions for the depassivation of reinforcement were not met.

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