LOW WATER DEMAND CEMENTS - WAY OF EFFICIENT USE OF CLINKER AND MINERAL FILLERS IN CONCRETES

Vestnik MGSU 10/2017 Volume 12
  • Khokhryakov Oleg Viktorovich - Kazan State University of Architecture and Civil Engineering (KGASU) Candidate of Technical Sciences, Associate Professor of the Department of Construction Materials, Products and Structures Technologies, Kazan State University of Architecture and Civil Engineering (KGASU), 1 Zelenaya str., Kazan, 420043, Republic of Tatarstan, Russian Federation.
  • Khozin Vadim Grigor’evich - Kazan State University of Architecture and Civil Engineering (KGASU) Doctor of Technical Sciences, Professor, Head of the Department of Building Materials Technology, Products and Constructions, Kazan State University of Architecture and Civil Engineering (KGASU), 1 Zelenaya str., Kazan, 420043, Republic of Tatarstan, Russian Federation.
  • Kharchenko Igor’ Yakovlevich - Moscow State University of Civil Engineering (National Research University) Dr.-Ing. habil, Head of the Implementation Sector, Research Institute for Expertise and Engineering, Moscow State University of Civil Engineering (National Research University), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.
  • Gazdanov David Vladimirovich - Moscow State University of Civil Engineering (National Research University) , Moscow State University of Civil Engineering (National Research University), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.

Pages 1145-1152

Subject: the provisions in the updated edition of the technical specifications for cements are analyzed. A trend to decrease the clinker volume in Portland cement due to the wider use of mineral additives, up to 95%, was observed. Research objectives: substantiation of the most complete and efficient use of Portland cement and mineral additives in the composition of low water demand cements. Materials and methods: portland cement, mineral additives and superplasticizer were used as raw materials for obtaining cements of low water demand. The experimental methods comply with the current standards. Results: comparative properties of low water demand cements and cements with mineral additives are presented. The properties of cement-water suspensions of these binders have been studied, and, on their basis, heavy concretes have been made. The results of the grindability of Portland cement and mineral components with a superplasticizer are given. Conclusions: it is shown that the cement of low water demand, in which the advantages of both Portland cement and mineral additives are more fully and efficiently presented, complies with the tendency to decrease the clinker volume to the greatest degree. It is established that the clinker volume index for heavy concrete prepared on low water demand cement is almost four times lower than that for heavy concrete based on common Portland cement.

DOI: 10.22227/1997-0935.2017.10.1145-1152

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HOMOGENIZATION OF NANO-MODIFIED CEMENT SYSTEMS AND SELECTION OF PARAMETERS OF THEIR TREATMENTIN VORTEX LAYER UNITS

Vestnik MGSU 2/2013
  • Yavruyan Khungianos Stepanovich - Rostov State University of Civil Engineering (RGSU) Candidate of Technical Sciences, Associate Professor, Chair, Department of Technology of Binders, Concretes and Building Ceramics; +7 (863) 2633096, Rostov State University of Civil Engineering (RGSU), 162 Sotsialisticheskaya St., Rostov-on-Don, 344022, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Filonov Igor Aleksandrovich - Rostov State University of Civil Engineering (RGSU) Director, Educational Laboratory, Department of Technology of Binders, Concretes and Building Ceramics; +7 (863) 2633096., Rostov State University of Civil Engineering (RGSU), 162 Sotsialisticheskaya St., Rostov-on-Don, 344022, Russian Federation.

Pages 130-136

Overview of application of nanotechnologies in production of construction materials is provided in the article. Successful cases of application of nano-materials and nano-particles in the construction industry are described, including molecular indicators informing about the stress-deformable state of bearing structures, coatings accumulating solar energy, and self-cleaning paints and varnishes. One of the core difficulties of introduction and uniform distribution of nano-particles is identified in the course of consideration of nano-modification and nano-disperse reinforcement of the cement stone. The problem is caused by the miniature dimensions of particles of modifiers and their small amounts. Employment of vortex layer devices, namely, the Process Activation Device, is proposed by the authors. These devices can ensure an appropriate extent of hashing. Thus, the two problems are eliminated by one solution: one is the uniform distribution of nano-disperse additives over the modified cement system and the other one is activation of initial input products. In the article, certain optimal parameters of the process of mixing a small mass of nano-disperse modifiers with building mixes (cement systems) are provided.

DOI: 10.22227/1997-0935.2013.2.130-136

References
  1. Golovin Yu.I. Nanotekhnologicheskaya nauka startovala [The Science of Nanotechnology Has Gotten Off the Mark]. Priroda Publ., 2004, no. 1, pp. 25—36.
  2. Golovin Yu.I., Rodaev V.V., Umrikhin A.V. Nanotekhnologii — na sluzhbu obshchestvu [Nanotechnologies to Serve the Society]. Vestnik TGU [Bulletin of Tomsk State University]. 2007, no. 9 (53), pp. 7—14.
  3. Kaprielov S.S., Batrakov V.G., Sheynfel’d A.V. Modifitsirovannye betony novogo pokoleniya: real’nost’ i perspektivy [Modified Concretes of the New Generation: Reality and Prospects]. Moscow, Predpriyatie Master Beton Publ., 2009.
  4. Sakharov G.P. O kratkosrochnoy perspektive nanotekhnologiy v proizvodstve stroitel’nykh materialov i izdeliy [On the Short Term Prospects of Nanotechnologies in the Production of Building Materials and Products]. Tekhnologiya betonov [Technology of Concretes]. 2009, no. 4 (33), pp. 65—67.
  5. Sakharov G.P. O kratkosrochnoy perspektive nanotekhnologiy v proizvodstve stroitel’nykh materialov i izdeliy. Ch. 2 [On the Short Term Prospects of the Nanotechnology in the Production of Building Materials and Products. Part 2.]. Tekhnologiya betonov [Technology of Concretes]. 2009, no. 5 (34), pp. 13—15.
  6. Ponomarev A.N., Pokropivnyy M.A. Struktura i fiziko-mekhanicheskie svoystva nanobetona [Structure and Mechanical Properties of Nano-concrete]. Nauchno-tekhnicheskie problemy prognozirovaniya nadezhnosti i dolgovechnosti konstruktsiy i metody ikh resheniya [Research and Technology-related Problems of Projecting the Reliability and Durability of Structures and Methods of Their Resolution]. Works of International Conference. St.Petersburg, Izd-vo politekhn. un-ta publ., 2008, pp. 275—279.
  7. Logvinenko D.D. Reaktor dlya provedeniya protsessov v kipyashchem sloe [Reactor of Processes in the Fluidized Bed]. Avtorskoe svidetel’stvo ¹ 168264 [Copyright Certificate no. 168264]. Byulleten’ izobreteniy [Bulletin of Inventions]. 1965, no. 4, p. 47.
  8. Filonov I.A., Yavruyan Kh.S. Mekhanicheskaya aktivatsiya portlandtsementa v apparate vikhrevogo sloya [Mechanical Activation of Portland Cement in the Vortex Layer Unit]. Inzhenernyy vestnik Dona [Bulletin of Engineering News of the Don]. 2012, no. 3. Available at: http://ivdon.ru/magazine/archive/n3y2012/969.

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INFLUENCE OF THE CEMENT TYPE ON THE CHARACTERISTICS OF THE MINERAL FOAM APPLICABLE IN FOAMED CERAMIC TECHNOLOGIES

Vestnik MGSU 10/2012
  • Korolev Evgeniy Valer'evich - Moscow State University of Civil Engineering (MGSU) Doctor of Technical Sciences, Professor, Director of Research and Educational Centre for Nanotechnologies, 8 (499) 188-04-00, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Beregovoy Vitaliy Aleksandrovich - Penza State University of Architecture and Civil Engineering (PSUAC) 8 (8412) 9-29-501, Penza State University of Architecture and Civil Engineering (PSUAC), 28 G. Titova St., Penza, 440028, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Kostin Dmitriy Sergeevich - Penza State University of Architecture and Civil Engineering (PGUAS) postgraduate student, Department of Building Materials, 8 (8412) 92-94-10, Penza State University of Architecture and Civil Engineering (PGUAS), 28 Titova St., Penza, 440028, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 166 - 170

The subject of the research is the influence of the type of Portland cement, as well as the nature and concentration of additives that represent electrolytes and polymers, onto the foam stability. The project is implemented within the framework of the research of foamed ceramic. Detailed explanation of the influence pattern is provided.
The research performed by the authors has generated the following findings. Besides the rheological properties of the solution, chemical interaction between the mix components must be taken into account in the course of development of the best foamed ceramic mix composition, as chemical processes produce a substantial influence onto the foam stability. Polymer additives based on liquid carbamyde-formaldehyde and polyacrylamide substantially improve the quality of the foam mineralized by the particles of the cement binder. They also assure the foam stability rate sufficient for the formation of a high-quality foamed material.

DOI: 10.22227/1997-0935.2012.10.166 - 170

References
  1. Shakhova L.D. Nekotorye aspekty issledovaniy strukturoobrazovaniya yacheistykh betonov neavtoklavnogo tverdeniya [Some Aspects of Research of Structurization of the Non-autoclaved Foamed Concrete]. Stroitel’nye materialy [Construction Materials], 2003, no. 2 (The Supplement), pp. 4—7.
  2. Beregovoy V.A., Proshina N.A., Korolev E.V., Beregovoy A.M., Bolotnikova O.V. Zharostoykie penobetony [Hear-resistant Foamed Concretes]. Penza, PGUAS Publ., 2007, 111 p.
  3. Gorin V.M., Sukhov V.Yu., Nekhaev P.V., Khlystov A.I., Riyazov R.T. Legkiy zharostoykiy beton yacheistoy struktury [Lightweight Heat-resistant Concrete That Has a Foamed Structure]. Stroitel’nye materialy [Construction Materials], 2003, no. 8, pp. 17—19.
  4. Beregovoy V.A., Korolev E.V., Bazhenov Yu.M. Effektivnye teploizolyatsionnye penokeramobetony [Effective Heat-insulating Foamed Ceramic Concretes]. Moscow, MGSU Publ., 2011, 264 p.
  5. Tikhomirov V.K. Peny. Teoriya i praktika ikh polucheniya i razrusheniya [Foams. Theory and Practice of Generation and Destruction]. Moscow, Khimiya Publ., 1975, 264 p.
  6. Kondo R., Daymon M. Fazovyy sostav zatverdevshego tsementnogo testa [Phase Composition of the Cured Cement Grout]. VI Mezhdunarodnyy kongress po khimii tsementa [6th International Congress on Cement Chemistry]. Moscow, 1976, book 1, vol. 2, pp. 244—258.
  7. Kuznetsova T.V. Alyuminatnye i sul’foalyuminatnye tsementy [Aluminate and Sulfoaluminate Cements]. Moscow, Stroyizdat Publ., 1986, 208 p.
  8. Kruglyakov P.M., Ekserova D.R. Pena i pennye plenki [Foam and Foam Films]. Moscow, Khimiya Publ., 1990, 432 p.
  9. Velichko E.G., Komar A.G. Retsepturno-tekhnologicheskie problemy penobetona [Problems of the Foamed Concrete Formulation and Technology]. Stroitel’nye materialy [Construction Materials]. 2004, no. 3, pp. 27—31.
  10. Lotov V.A., Mitina N.A. Vliyanie dobavok na formirovanie mezhporovoy peregorodki v gazobetone neavtoklavnogo tverdeniya [Influence of Additives onto Formation of Interpore Partitions in the Non-autoclaved Foamed Concrete]. Stroitel’nye materialy [Construction Materials]. 2003 (The Supplement), no. 3, pp. 2—6.

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SYNTHESIS OF EXPANDER TO PREVENT CONTRACTION OF CEMENT STONE

Vestnik MGSU 3/2017 Volume 12
  • Elenova Aurika Almazovna - Moscow State University of Civil Engineering (National Research University) (MGSU) candidate of technical sciences, head Research Laboratory of Building Composites, Solutions and Concretes, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.
  • Krivoborodov Yuriy Romanovich - Dmitry Mendeleev University of Chemical Technology of Russia Doctor of Technical Sciences, Professor, Department of Chemical Engineering of Composite and Cementing Agents, Dmitry Mendeleev University of Chemical Technology of Russia, 20 bldg 4 Geroev Panfilovtsev str., Moscow, 125480, Russian Federation.

Pages 326-333

This article contains the results of studies of the use of additives containing crystallization components significantly affecting the curing of cement, improving the structure of cement stone and concrete. The crystalline component is obtained using the rotary-pulse unit, which provides not only the grinding of agents, but their interaction with each other as well in order to accelerate the hydration and structure formation in cement stone. The degree, and kinetics of hydration, the composition of hydrated phases, the structure of the additives and cement stone was studied using the following methods: x-ray diffraction (XRD), differential thermal analysis (DTA), scanning electron microscope (SEM). Mechanical properties of cement were determined by standard methods and techniques. The expander produced by means of hydrodynamic activation of the sulfoaluminate clinker (SAC) consists of ettringite and hydrated calcium silicates, which are characterized by high dispersion rate (less than 10 µm) and reactivity as the seed for the crystallization of hydrated compounds. The introduction of the ultrafine additives of the crystalline SAC (within 1-5%) was discovered to cause expansion of the cement stone. Implementation of the additives increases cement hydration and contributes to the formation of active centers of crystallization that lead to the fast formation of ettringite, hydrated calcium aluminates and calcium silicates. The activated crystalline additive provides for significant reduction of porosity, initial curing, and high strength of cement stone. In addition, the additive is an expansive component, forming needle-like crystals of ettringite during hydration. These microcrystals grow in the capillaries of cement stone, filling them, and create conditions for improving the crack resistance of cement concrete.

DOI: 10.22227/1997-0935.2017.3.326-333

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Investigation of rational types of light concrete for external walls in conditions of hot climate

Vestnik MGSU 10/2018 Volume 13
  • Hoshim R. Ruziev - Bukhara Engineering Technology Institute , Bukhara Engineering Technology Institute, 15 K. Murtazaev st., Bukhara, 200100, Uzbekistan.

Pages 1211-1219

Introduction. The paper presents theoretical and experimental studies of the improvement of the structure of lightweight concrete, which provides the maximum value of the attenuation of the amplitude of external air temperature fluctuations during the passage of heat flow through the walls and the reduction of thermal conductivity, the results of the 3-factor experiment on determining the rational structure of claydite concrete and the methods for their processing. To determine the purposeful structure of the composition of lightweight concrete and its thermal conductivity, a complex of research works was carried out at the Central Research Institute for Housing, applied to lightweight concrete for exterior walls. The main optimization criterion was the maximum reduction in thermal conductivity while providing the necessary strength, durability and waterproofness. The purpose of this work is theoretical research and experimental substantiation of methods for improving the structure of lightweight concrete used for a hot climate with improved functional performance. Materials and methods. As material a claydite gravel with bulk density p = 400 kg/m3 of Lianozovsky plant (Moscow) was used, at a ratio of 40 % of the fraction 5-10 mm and 60 % of the fraction 10-20 mm and a Portland cement of the brand “400” of the Voskresensky plant, not plasticized. The water flow rate was varied for 10 seconds, to ensure the mixture to be vibropacked.As a foam generating agent and plasticizer, the “Saponified wood resin” (SDO) was used in a 5 % aqueous solution. The methods were adopted in accordance with the Recommendation on the technology of factory production and quality control of lightweight concrete and large-panel constructions of residential buildings. M. CNIIEP dwelling, 1980. In the department of the lightweight concrete application at CNIIEP of dwelling, a method for the purposeful formation of the structure and composition of lightweight concrete, which provides a set of physic-technical, technological and technical-economic requirements, was developed. Results. Calculations are reduced to obtaining mathematical models of dependence of strength R, density ρ, thermai conductivity λ and other indicators of concrete characteristics from initial factors in the form of regression equations. Based on the equations obtained, it was possible to determine the expedient composition of lightweight concrete, which, in combination with the operational characteristics, provides comparable results of the technical and economic characteristics of a single-layer structure from the projected type of lightweight concrete. Conclusions. 1. An improved composition of the structural and heat insulating lightweight concrete for the load-bearing part of the structure, providing its high thermal stability by chemical additives and low consumption of porous sand, was developed. An algorithm for selecting its composition on computer is made. 2. The conducted researches in the field of design of external enclosing structures for hot climate conditions have shown that: single-layer exterior wall constructions with massiveness of D ≤ 4 provide minimum allowable values of heat flux attenuation and temperature fluctuation amplitude on the inner wall surface.

DOI: 10.22227/1997-0935.2018.10.1211-1219

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