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REINFORCING FIBRES AS PART OF TECHNOLOGY OF CONCRETES

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 .
  • Rudnitskaya Viktoriya Aleksandrovna - Moscow State University of Civil Engineering (MSUCE) master student, Department of Technology of Finishing and Insulation Materials, 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 .
  • Smirnova Tat'yana Viktorovna - Moscow State University of Civil Engineering (MSUCE) ROCKWOOL postgraduate student Leading Specialist, Moscow State University of Civil Engineering (MSUCE) ROCKWOOL, 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 160 - 164

Methods of modification of the foamed fibre concrete technology and optimization of its parameters within the framework of methodologies of new construction materials developed by the specialists of Department of Technology of Finishing and Insulation Materials of MSUCE is considered in the paper. The methodology of highly porous materials is based on the research and modeling of their structure, and optimization of the process of their manufacturing. The core constituent of the proposed methodology is the identification of the markets for the designed products, as well as the pre-setting of their properties and assurance of their stability over the time.
The foamed fibre concrete technology represents modified procedures of preparation of the foam, the mineral component, and the basalt fiber, the blending of the components, their casting and heat treatment. The process-related parameters were subjected to double-staged analysis: Stage 1 represented an experiment encompassing the whole process. As a result of the experiment, factors of major impact (or control parameters) were identified. At Stage 2, factorial experiment was conducted to identify second-order mathematical dependencies. The results were subjected to analytical optimization, and graphical representation of dependencies was performed. Selection of the composition and optimal process parameters was performed with the help of G-BAT-2011 software programme developed at MSUCE.
It was identified that the basalt fibre consumption rate influences both the strength and the density of products made of cellular concrete. The length of the basalt fibre impacts the strength of products. A nomogram was developed to identify the consumption rate of the basalt fibre driven by the strength of products and the Portland cement consumption rate. The authors also studied the influence of the consumption rate of Portland cement and basalt fibre onto the structural quality ratio of the foamed fibre concrete.

DOI: 10.22227/1997-0935.2012.4.160 - 164

References
  1. 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.
  2. 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.

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FOAM CONCRETE REINFORCEMENT BY BASALT FIBRES

Vestnik MGSU 6/2012
  • Zhukov Aleksey Dmitrievich - Moscow State University of Civil Engineering (MSUCE) Candidate of Technical Sciences, Professor, Department of Technology of Finishing and Insulation Materials, 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 .
  • Rudnitskaya Viktoriya Aleksandrovna - Moscow State University of Civil Engineering (MSUCE) master student, Department of Technology of Finishing and Insulation Materials, 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 83 - 87

The authors demonstrate that the foam concrete performance can be improved by dispersed reinforcement, including methods that involve basalt fibres. They address the results of the foam concrete modeling technology and assess the importance of technology-related parameters. Reinforcement efficiency criteria are also provided in the article.
Dispersed reinforcement improves the plasticity of the concrete mix and reduces the settlement crack formation rate. Conventional reinforcement that involves metal laths and rods demonstrates its limited application in the production of concrete used for thermal insulation and structural purposes. Dispersed reinforcement is preferable. This technology contemplates the infusion of fibres into porous mixes. Metal, polymeric, basalt and glass fibres are used as reinforcing components.
It has been identified that products reinforced by polypropylene fibres demonstrate substantial abradability and deformability rates even under the influence of minor tensile stresses due to the low adhesion strength of polypropylene in the cement matrix.
The objective of the research was to develop the type of polypropylene of D500 grade that would demonstrate the operating properties similar to those of Hebel and Ytong polypropylenes. Dispersed reinforcement was performed by the basalt fibre. This project contemplates an autoclave-free technology to optimize the consumption of electricity. Dispersed reinforcement is aimed at the reduction of the block settlement in the course of hardening at early stages of their operation, the improvement of their strength and other operating properties. Reduction in the humidity rate of the mix is based on the plasticizing properties of fibres, as well as the application of the dry mineralization method.
Selection of optimal parameters of the process-related technology was performed with the help of G-BAT-2011 Software, developed at Moscow State University of Civil Engineering. The authors also provide their overview of intellectual property rights and an economic efficiency assessment.

DOI: 10.22227/1997-0935.2012.6.83 - 87

References
  1. Novitskiy A.G., Efremov M.V. Volokno iz gornykh porod dlya armirovaniya betonov [Rock Fibres Designated for Concrete Reinforcement]. Proceedings of the 7th All-Russian Scientific and Practical Conference in Belokurikha. Moscow, Khimmash Publ., 2007, pp. 116—120.
  2. Sakharov G.P., Strebitskiy V.P., Voronin V.A. Novaya effektivnaya tekhnologiya neavtoklavnogo porobetona [New Effective Technology of the Autoclave-Free Concrete]. Stroitel’nye materialy i obrudovanie tekhnologii XX veka [Building Materials and Equipment Technologies of the 20th Century]. 2002, no. 6, pp. 28—29.
  3. Zhukov A.D., Chugunkov A.V. Lokal’naya analiticheskaya optimizatsiya tekhnologicheskikh protsessov [Local Analytical Optimization of Technology-related Processes]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2011, no. 4, pp. 273—279.

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