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RESEARCH OF BUILDING MATERIALS

INTERACTION OF MECHANICALLY ACTIVATED WATER WITH THE CEMENT BINDING AGENT

Vestnik MGSU 2/2012
  • Gujumdzhjan Perch Pogosovich - Ivanovо State University of Architecture and Civil Engineering Doctor of Technical Sciences, Professor, Department of Production of Building Materials, Ivanovо State University of Architecture and Civil Engineering, 20 March 8 St., Ivanovo, 153037, Russia; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Vetrenko Tat'jana Grigor'evna - Ivanovо State University of Architecture and Civil Engineering Candidate of Technical Sciences, Associated Professor, Department of Hydraulics, Water Supply and Sanitation 8 (4932) 32-85-40, Ivanovо State University of Architecture and Civil Engineering, 20 March 8 St., Ivanovo, 153037, Russia; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Ladaev Nikolaj Mihajlovich - Ivanovо State University of Architecture and Civil Engineering Candidate of Technical Sciences, Associated Professor, Department of Production of Building Materials 8 (4932) 41-39-06 8 (4932) 38-40-20, Ivanovо State University of Architecture and Civil Engineering, 20 March 8 St., Ivanovo, 153037, Russia; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Zinov'eva Ekaterina Vital'evna - Ivanovо State University of Architecture and Civil Engineering Senior Lecturer, Department of Heat, Gas Supply and Ventilation, Ivanovо State University of Architecture and Civil Engineering, 20 March 8 St., Ivanovo, 153037, Russia; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 117 - 120

The article presents the procedure of interaction between the water and the particles of the cement binding agent, if subjected to high-speed processing inside an intensive mixing device that represents a hydrodynamic stirrer composed of a rotor and variable section turbines. The proposed method of modification (mechanical activation) of the cement and water suspension makes it possible to reduce the cost of concrete due to reduction of the cement consumption rate. The research of strength-related properties of the cement stone has proven that high-speed mechanical processing of the binding agent, if mixed with the water, may improve mechanical properties of concrete by 25 to 30 %.

DOI: 10.22227/1997-0935.2012.2.117 - 120

References
  1. Zacepina G.N. Fizicheskie svojstva i struktura vody [Physical Properties and Structure of Water], 2nd edition. Moscow, Himija, 1987.
  2. Usmanov S.M. Radiacija: spravochnye materialy [Radiation: Reference Materials]. Moscow, VLADOS, 2001.
  3. Haritonov A.M. Strukturno imitacionnoe modelirovanie v issledovanijah svojstv cementnyh kompozitov [Structural Simulation as Part of Research of Properties of Cement Composites]. Author’s abstract of the dissertation for the title of the doctor of technical sciences, St.Petersburg, PGASU, 2009.
  4. Gujumdzhjan P.P., Rascvetova E.A., Vetrenko T.G., Vaganov F.A. Vlijanie vysokoskorostnoj obrabotki vody v vodno-cementnoj suspenzii na svojstva betona [Impact of High-Speed Processing of Water and Cement Suspension onto Concrete Properties], Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering], 2009, Issue # 2, pp. 146—152.

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INFLUENCE OF WATER-TO-CEMENT RATIO ON AIR ENTRAILMENT IN PRODUCTION OF NON-AUTOCLAVED FOAM CONCRETE USING TURBULENCE CAVITATION TECHNOLOGY

Vestnik MGSU 10/2012
  • Gorshkov Pavel Vladimirovich - Ivanovo State University of Architecture and Civil Engineering (ISUACE) postgraduate student, Department of Engineering Structures, Ivanovo State University of Architecture and Civil Engineering (ISUACE), 20 8ogo Marta St., Ivanovo, 153037, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 154 - 158

Non-autoclaved foam concrete is an advanced thermal insulation material. Until recently, foam concrete production has been based on separate preparation of foam and solution, followed by their blending in a mixer. The situation changed when high-quality synthetic foaming agents and turbulence cavitation technology appeared on the market. Every model provides a dependence between the foam concrete strength and the water-to-cement ratio. According to the water-cement ratio we can distinguish strong concrete mixtures (with the water-to-cement ratio equal to 0.3…0.4) and ductile ones (with the water-to-cement ratio equal to 0.5…0.7). Strong concrete mixtures are more durable. The lower the water-to-cement ratio, the higher the foam concrete strength.
However super-plastic substances cannot be mixed by ordinary turbulent mixers. Foam concrete produced using the turbulence cavitation technology needs air-entraining, its intensity being dependent on several factors. One of the main factors is the amount of free water, if it is insufficient, the mixture will not be porous enough. A researcher needs to identify the optimal water-to-cement ratio based on the water consumption rate. Practical production of prefabricated concrete products and structures has proven that the reduction of the water-to-cement ratio improves the strength of the product. The task is to find the water-to-cement ratio for the foam concrete mixture to be plastic enough for air entraining. An increase in the ratio causes loss in the strength. The ratio shall vary within one hundredth points. Super-plasticizers are an alternative solution.

DOI: 10.22227/1997-0935.2012.10.154 - 158

References
  1. Babkov V.V., Bazhenov Yu.M., Bykova A.A. Tsementy, betony, stroitel’nye rastvory i sukhie smesi [Cements, Concretes, Mortars and Dry Mixes]. St.Petersburg, NPO Professional Publ., 2007, Part I, 804 p.
  2. GOST 25485—89. Betony yacheistye tekhnicheskie usloviya [Cellular Concretes. Specifi cations].
  3. Gorshkov P.V. Penobeton i ego rol’ v sovremennom stroitel’stve [Foam Concrete and Its Role in Contemporary Construction]. Informatsionnaya sreda VUZa [Information Environment of Institutions of Higher Education]. Ivanovo, 2011, no. 17, pp. 507—510.
  4. Spravochnik stroitelya. Stroitel’naya tekhnika, konstruktsii i tekhnologii [Builder’s Reference Book. Machinery, Structures and Technologies]. Moscow, 2007, Tekhnosfera Publ., vol. 1, 520 p.
  5. Kholmyanskiy M.M. Beton i zhelezobeton: deformativnost’ i prochnost’ [Concrete and Reinforced Concrete: Deformability and Strength]. Moscow, Stroyizdat Publ., 1997, 576 p.
  6. Merkin A.P., Zayfman M.I. Seriya 8. Promyshlennost’ avtoklavnykh materialov i mestnykh vyazhushchikh [Series 8. Production of Autoclaved Materials and Local Binders]. Moscow, VNIIESM Publ., 1982, no. 2.
  7. Muradov E. G. Materialy dlya prigotovleniya betonnoy smesi i stroitel’nogo rastvora [Materials for Preparation of a Concrete Mix and Building Mortar]. Moscow, Vyssh. shk. publ., 1987, 110 p.
  8. Ruzhinskiy S.I. Vse o penobetone [Everything about Foam Concrete]. St.Petersburg, Stroy Beton Publ., 2006, 630 p.
  9. Evdokimov N.I., Matskevich A.F., Sytnik V.S. Tekhnologiya monolitnogo betona i zhelezobetona [Technology of In-situ Concrete and Reinforced Concrete]. Moscow, Vyssh. shk. publ., 1980, 355 p.
  10. Nevill’ A.M. Svoystva betona [Properties of Concrete]. Moscow, Izd-vo literatury po stroitel’stvu publ., 1972, 344 p.

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