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Loganina Valentina Ivanovna -
Penza State University of Architecture and Construction
Doctor of technical Sciences, professor, head. Department “Quality Management and construction production technologies”, Penza State University of Architecture and Construction, 28 Germana Titova st., Penza, 440028, Russian Federation.
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Kislitsyna Svetlana Nikolaevna -
Penza State University of Architecture and Construction
Candidate of technical Sciences, associate Professor of the Department “Technology of building materials and wood processing”, Penza State University of Architecture and Construction, 28 Germana Titova st., Penza, 440028, Russian Federation.
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Mazhitov Erkebulan Bisengalieva -
Penza State University of Architecture and Construction
Postgraduate Student of the Department “Quality Management and construction technologies”, Penza State University of Architecture and Construction, 28 Germana Titova st., Penza, 440028, Russian Federation.
Subject: durability of coating based on silicate paints. The article substantiates the prerequisites for using sol-silicate paints for finishing exterior walls of buildings. Sol-silicate paints obtained by mixing the sol of silicic acid with sodium liquid glass are considered. The features of formation of the structure of polysilicate solutions have been studied. Materials and methods: silicate and sol silicate paints. Polysilicate solutions were obtained by the interaction of stabilized solutions of colloidal silica (sols) with aqueous solutions of alkaline silicates (liquid glasses). The sol of the silicic acid Nanosil 20 and Nanosil 30 was used. For determining the long-term strength, samples measuring 10 ? 30 mm were cut from a free paint and varnish film. To evaluate the parameters of the activation energy, a series of experiments were performed to measure the longevity at various constant temperatures and stresses. Results: a higher value of the activation energy and a lower value of the structure-sensitive factor for coatings based on a polysilicate solution indicate their great strength and durability. When coatings are wetted, a decrease in the activation energy of destruction is observed, and it is more significant in coatings based on potassium liquid glass, and an increase in the structure-sensitive coefficient is also observed. Conclusions: studies have been carried out to evaluate the long-term strength of coatings based on silicate paints. It has been established that the activation energy of destruction of coatings based on polysilicate solutions is higher than the activation energy of destruction of coatings based on liquid glass. The values of the structure-sensitive factor are calculated. The results of the conducted studies and calculations indicate a higher resistance of coatings based on the potassium polysilicate solution.
DOI: 10.22227/1997-0935.2018.7.877-884
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Oreshkin Dmitriy Vladimirovich -
Moscow State University of Civil Engineering (MGSU)
Doctor of Technical Sciences, Chair, Department of Construction Materials; +7 (499) 183-32-29., Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation;
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.
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Kaptsov Petr Vladimirovich -
Moscow
State University of Civil Engineering (MSUCE)
postgraduate student, Department of Building Materials
8 (499) 183-32-29, Moscow
State University of Civil Engineering (MSUCE), 26 Yaroslavskoe shosse, Moscow, 129337, Russia;
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.
The paper represents an overview of masonry mortars designated for walls made of small-size masonry units. The authors argue that regular mortars cannot demonstrate uniform heat transfer performance. Regular mortar walling has cold bridges. Cement-sand mortars have high cement and water consumption rates that boost mortar shrinkage and creep.
The paper also demonstrates that no surface effects or contact interaction between the cement grout and the surface of the sand and other aggregates are taken into consideration in connection with the above statement. Aggregates added to the mortar have a highly developed surface; they also feature a substantial supply of free energy. The authors believe that the extrusion method can make it possible to employ the free energy to improve the strength and other properties of the material in the course of formation of its structure.
This process may also improve the moistening and the adhesive strength of particles; it draws the cement particles as close to one another as it may be possible, it cleans their surface and extracts any excessive water out of the mix.
The paper also presents the results of the research of the microstructure of spilt Portland cement and hollow glass spheres, their mineral and chemical analyses, as well as the properties of masonry mortars. The paper presents a conclusion that their high process-dependent parameters and superior operating performance are attainable through the introduction of effective hollow glass spheres into masonry mortars and the application of the extrusion method. The aforementioned novelties may reduce the water consumption rate, improve the strength, freeze resistance and durability of cement mortars.
The preparation of this paper involved the study of nine reference books. This paper is the first one of a series of papers covering the method of extrusion of lightweight cement mortars.
DOI: 10.22227/1997-0935.2012.3.115 - 119
References
- Pashkevich A.A., Pervushin E.G., Oreshkin D.V. Polyesteklyannye mikrosfery i formirovanie tsementnykh sistem [Hollow Glass Microspheres and Formation of Cement Systems]. Collected works of Scientific and Technical Conference on Building Physics in the XXI Century. Moscow, NIISF, 2006, pp.134—139.
- Kirillov K.I., Pashkevich A.A., Pervushin E.G., Oreshkin D.V. Oblegchenny ykladochnyy rastvor [Lightweight mortar]. Collected works of Scientific and Technical Conference on Building Physics in the XXI Century. Moscow, NIISF, 2006, pp. 151—154.
- Oreshkin D.V., Pashkevich A.A., Pervushin E.G. Formirovanie struktur y tsementnykh sistem s polymisteklyannymi mikrosferami [Formation of the Structure of Cement Systems with Hollow Glass Microspheres]. Collected works of Scientific and Technical Conference in Ukhta, UGTU [Ukhta State Technical University], 2007, pp. 276—279.
- Kirillov K.I., Oreshkin D.V. Effektivnye kladochnye rastvory [Effective Mortars]. Collected works of Schientific and Technical Conference on Building Physics in the XXI Century. Moscow, NIISF, 2006, pp. 120—133.
- Oreshkin D.V., Belyaev K.V., Semenov V.S. Obshchaya skhema polucheniya oblegchennykh i sverkhlegkikh tsementnykh rastvorov [General Overview of Production of Lihtweight and Ultralight Cement Mortars], Stroitel’stvo neftyanykh i gazovykh skvazhin na sushe i na more [Construction of Onshore and Offshore Oil and Gas Wells], 2010, no. 11, pp. 32—33.
- Sakharov G.P. Nauchno-tekhnicheskie predposylki polucheniya ekstrudirovannogo melko-zernistogo betona [Scientific and Technical Prerequisites for Obtaining Extruded Fine-grained Concrete]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering], 2011, no. 4, pp. 483—485.
- Bazhenov Yu.M., Magdeev Yu.H., Alimov L.A., Voronin V.V., Goldenberg L.B. Melkozernistye betony [Fine-grained Concretes]. Moscow, ASV, 1998, 148 p.
- Bazhenov Yu.M. Tekhnologiya betona [Technology of Concrete]. Moscow, ASV, 2011, 528 p.
- Sakharov G.P., Tran Minh Dyk. Povyshenie svoystv melkozernistogo betona ekstrudirovaniem iskhodnykh smesey [Improving the Properties of Fine-grained Concrete by Extrusion of Original Mixtures]. Beton i zhelezobeton [Concrete and Reinforced Concrete], 2009, no. 1, pp. 6—8.
- Sakharov G.P. Ekstrudirovannyy melkozernistyy beton s povyshennymi kachestvennymi pokazatelyami [Better Quality Extruded Fine-grained Concrete]. Beton i zhelezobeton [Concrete and Reinforced Concrete], 2010, no. 4, pp. 2—7.