MODELING AND OPTIMIZATION OF THE AEROCONCRETE TECHNOLOGY

Vestnik MGSU 4/2012
  • Zhukov Aleksey Dmitrievich - Moscow State University of Civil Engineering (MSUCE) C andidate o f Technical S ciences, A ssociated P rofessor, D epartment of Technology of Finishing and Insulating Materials, Moscow State University of Civil Engineering (MSUCE), 26 Yaroslavskoeshosse, Moscow, 129337, Russia; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Chugunkov Aleksandr Viktorovich - Moscow State University of Civil Engineering (MGSU) Director, Department of Examination of Buildings, postgraduate student, Department of Technology of Finishing and Insulation Materials, 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 .
  • Gudkov Pavel Kirillovich - Moscow State University of Civil Engineering (MSUCE) Engineer, Web-editor, Editorial and Publishing Centre, Moscow State University of Civil Engineering (MSUCE), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 155 - 159

Heat-insulating cellular concrete manufactured in the variotropic pressure environment, may be used both for making single-piece products, and for monolithic construction purposes. Optimization of technology-related parameters prevents excessive consumption of principal components, while output products maintain pre-set characteristics. Both the product and the technology are based on the provisions of the general methodology of development of highly porous materials.
The technology is based on the principle of adjustable formation of the state of stress in the variotropic pressure environment. The state of stress maintained in the course of blowout contributes to formation of optimized cellular structure (in accordance with the criteria that include the shape, dimensions of pores, and characteristics of interpore partitions).
The process of manufacturing of the heat-insulating cellular concrete breaks down into the following stages: preparation of raw materials, preparation of the cellular concrete mixture, casting of products, thermal processing or ageing in the natural environment. Products are placed under heating domes, equipped with electric heaters, and exposed to heat treatment for six hours. Before the heat treatment, products are kept in their moulds for four hours. In the absence of heat treatment, products are kept on their pallets for 14 days.
Selection of the appropriate composition and optimal technological parameters is performed with the help of G-BAT-2011 software programme developed at MSUCE. The software is based on the methodology that is based on complete factorial experiments, experiments based on fractional replicates and testing of all essential statistical hypotheses. Linear, incomplete quadratic and quadratic equations generated as a result of experiments make it possible to design a model that represents natural processes in the adequate manner. The model is analytically optimized and interpreted thereafter.

DOI: 10.22227/1997-0935.2012.4.155 - 159

References
  1. Zhukov A.D., Chugunkov A.V. Lokal'naya analiticheskaya optimizatsiya tehnologicheskikh protsessov [Local Analytical Optimization of Technology-related Processes]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2011, no. 1, vol. 2, pp. 273—278.
  2. Zhukov A.D., Chugunkov A.V. Rudnitskaya V.A. Reshenie tehnologicheskikh zadach metodami matematicheskogo modelirovaniya [Resolution of Technology-related Problems by Methods of Mathematical Modeling]. Moscow, MSUCE, 2011, 176 p.

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EFFICIENT NANO-SCALE ADMIXTURE FOR FOAM STABILITY IMPROVEMENT OF CELLULAR CONCRETES

Vestnik MGSU 10/2012
  • Grishina Аnna Nikolaevna - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Junior Researcher, Scientific and Education 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 .
  • Korolev Evgeniy Valer'evich - Moscow State University of Civil Engineering (MGSU) Vice-rector for Academic Affairs, Director, Scientific 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 .

Pages 159 - 165

The authors present their methodology of synthesis of a nano-scale additive designated for the stabilization of synthetic foaming agents. The nano-scale admixture is composed of iron hydroxide (III) sol and aqueous sodium hydro silicates (water glass). Besides the above method, the topological structural model of the nano-scale additive is proposed. The additive stability was assessed upon its one-day storage (with the foaming agent added), and the assessment data are provided in the article. The authors have discovered that it is advisable to use an iron chloride solution in the concentration of 1 % to manufacture the iron hydroxide (III) sol.
The authors have also discovered that the rate of jellification goes up in the process of injecting the foaming agent into the foam that contains the nano-scale admixture developed by the authors. Dependence between the amount of sodium hydro silicate and the viscosity of the system composed of the water glass and the sol of iron hydroxide (III) is examined in detail. The authors have identified that the average water glass viscosity curve demonstrates an extreme nature. The additive is used for the stabilization of the foam generated by synthetic foaming agents. The injection of the proposed additive improves foam stability. It is noteworthy that this positive result is free from any negative side effects.

DOI: 10.22227/1997-0935.2012.10.159 - 165

References
  1. Svatovskaya L.B., Sycheva À.Ì., Eliseeva N.N. Patent ¹ 2377207 Composite Admixture. Applicant and patentee: St.Petersburg State University of Railroad Engineering. Date of publication: 27.12.2009.
  2. Svatovskaya L.B., Sycheva À.Ì., Eliseeva N.N. Patent ¹ 2400443 Composite Admixture. Applicant and patentee: St.Petersburg State University of Railroad Engineering. Date of publication: 27.09.2010.
  3. Svatovskaya L.B., Sycheva À.Ì., Eliseeva N.N.. Patent ¹ 2393127 Composite Admixture for Foam Concretes. Applicant and patentee: St.Petersburg State University of Railroad Engineering. Date of publication: 27.06.2010.
  4. Eliseeva N.N. Penobetony neavtoklavnogo tverdeniya na osnove dobavok nanorazmera [Non-Autoclaved Foam Concretes with Nano-scale Admixtures]. St.Petersburg, 2010, 22 p.
  5. Lebedeva Ò.À. Yacheistye stenovye materialy na osnove mineralizovannykh pen iz zhidkogo stekla [Porous Walling Materials Made of Mineralized Water Glass Foams]. Bratsk, 2004, 201 p.
  6. Svatovskaya L.B., Sycheva A.M., Eliseeva N.N. Povyshenie kachestva neavtoklavnogo betona dobavkami nanorazmera [Improvement of the Non-autoclaved Foam Concrete Quality by Nano-scale Additives]. Nanotekhnologii v stroitel’stve [Nanotechnologies in Civil Engineering]. 2011, no. 1, pp. 50—62. Available at: http://nanobuild.ru.
  7. Svatovskaya L.B., Sycheva À.Ì., Eliseeva N.N. Patent ¹ 2443647 Composite Admixture for Foam Concretes. Applicant and patentee: St.Petersburg State University of Railroad Engineering. Date of publication: 27.02.2012.
  8. Svatovskaya L.B., Solov’eva V.Ya., Stepanova I.V., Korobov N.V., Starchuk D.S., Belyaev P.V., Chertkov M.V., Ivanova A.Y. Patent ¹ 2433099 High-strength Concrete. Applicant and patentee: St.Petersburg State University of Railroad Engineering. Date of publication: 10.11.2011.
  9. Komokhov P.G. Zol’-gel’ kak kontseptsiya nanotekhnologii tsementnogo kompozita, struktura sistemy i puti ee realizatsii [Sol-gel as a Concept of Nanotechnology of a Cement Composite Material. Structure of the System and Methods of Its Implementation]. Available at: http://rudocs.exdat.com/docs/index-319653.html. Date of access: 12.06.2012.
  10. Voyutskiy S.S. Kurs kolloidnoy khimii [A Course of Colloid Chemistry]. Moscow, Khimiya Publ., 1975, 512 p.

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SYNTHESIS OF STRUCTURES OF CELLULAR-CONCRETE COMPOSITES WITH NANOSIZED COMPONENTS

Vestnik MGSU 7/2017 Volume 12
  • Solonina Valentina Anatol'yevna - Industrial University of Tyumen (TIU) Candidate of Technical Sciences, Associate Professor, Department of Construction Materials, Industrial University of Tyumen (TIU), 38 Volodarskogo str., Tyumen, 625000, Russian Federation.
  • Zimakova Galina Alexandrovna - Industrial University of Tyumen (TIU) Candidate of Technical Sciences, Associate Professor, Head of the Department of Construction Materials, Industrial University of Tyumen (TIU), 38 Volodarskogo str., Tyumen, 625000, Russian Federation.
  • Baianov Dmitriy Sergeevich - Industrial University of Tyumen (TIU) Post-graduate Student, Department of Construction Materials, Industrial University of Tyumen (TIU), 38 Volodarskogo str., Tyumen, 625000, Russian Federation.
  • Sharko Pavel Valer'evich - Industrial University of Tyumen (TIU) Master`s Degree Student, Department of Construction Materials, Industrial University of Tyumen (TIU), 38 Volodarskogo str., Tyumen, 625000, Russian Federation.
  • Zelig Marina Petrovna - Industrial University of Tyumen (TIU) Senior Lecturer, Department of Construction Materials, Industrial University of Tyumen (TIU), 38 Volodarskogo str., Tyumen, 625000, Russian Federation.

Pages 733-740

The article reveals the results of one of the stages of the integrated research studying the influence of compounds and disperse characteristics of silica-containing materials on structure formation and qualities of cellular concrete. It has been indicated that the improvement of physical and mechanical properties of cellular concrete can be achieved through creating the best possible pore structure of the concrete and the structure of interporous frame as well as intensification of hydration and crystallization processes under hydrothermal treatment and, as a result, the increase in number and perfecting morphology of hydrated phases. Up-to-date knowledge about the structure and properties of cellular concrete shows potential capacities to enlarge strength characteristics through forming a nanopore structure of a matrix stone, the effective usage of power potential of multicomponent binding including Portland cement, high-calcium lime, activate silica components with grains of submicron and nanometer range.

DOI: 10.22227/1997-0935.2017.7.733-740

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