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Stroitel`nye Materialy №7

Stroitel`nye Materialy №7
July, 2017

Table of contents

V.V. POTAPOV 1 , Doctor of Sciences (Engineering); E.N. GRUSHEVSKAYA 2 , Engineer (grushevskay_en@tut.by), S.N. LEONOVICH 2 , Doctor of Sciences (Engineering), Foreign Member of RAACS
1 Scientific-Research Geotechnological Center Far Eastern Branch of the Russian Academy of Sciences (Postbox 56, 30, North-Eastern Highway, Petropavlovsk-Kamchatsky 683002, Russian Federation)
2 Belarusian National Technical University (65, Nezavisimosti Avenu, Minsk, 220013, Belarus)

Modification of Materials on the Basis of Cement with Hydrothermal Nano-Silica The influence of silica nano-particles obtained from hydrothermal solutions concentrated at the Mutnovskoye deposit of the South Kamchatka on the properties of the cement-sand mor- tar and heavy concrete has been studied. The ultra-sound treatment of the solution was used for more efficient distribution of particles in the liquid volume. It is established that the nano-silica extracted from the hydrothermal solution in the form of sol and nano-powder actively influences on the density: improves it due to the filling of micro-pores of the cement stone with additional newgrowths obtained as a result of active interaction of the powder; on the rate of strength gain at early stages of hardening; the ultimate strength when compress- ing materials on the basis of cement, depending on the mass percent of the nano-additive introduction. The most pronounced effect is observed when introducing this additive paired with a superplasticizer.

Keywords: hydrothermal solution, nano-modifiers, nano-silica, heavy concrete, ment materials.

For citation: Potapov V.V., Grushevskaya E.N., Leonovich S.N. Modification of materials on the basis of cement with hydrothermal nano-silica. Stroitel’nye Materialy [Construction materials]. 2017. No. 7, pp. 4–9. (In Russian).

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International Conference «Nanomaterials and Nanotechnologies in Construction: Theory, Practice, Technical Regulation» (ICNNC-2017) (Information) .. . . . .10
A.S. INOZEMTSEV, Candidate of Sciences (Engineering) (InozemcevAS@mgsu.ru), E.V. KOROLEV, Doctor of Sciences (Engineering) (KorolevEV@mgsu.ru) Moscow State University of Civil Engineering (26, Yaroslavskoe Highway, Moscow, 129337, Russian Federation) Comparative Analysis of Influence of Nanomodification and Micro-Dispersed Reinforcement on the Process and Parameters of Destruction of High-Strength Lightweight Concrete *

The paper presents a comparative analysis of the impact of nanomodification and microdispersed reinforcement technologies on the process and parameters of destruction of high- strength lightweight concretes with hollow microspheres. It has been established that the introduction of microfiber is the most justified in terms of indicators of physico-mechanical properties and parameters of acoustic emission. Introduction of polypropylene fiber reduces the defectiveness of the structure of the composite, changes the nature of destruction and leads to an increase of strength characteristics. The use of hollow microspheres with a nanoscale modifier grafted on the surface also contributes to a change in the nature of the frac- ture and increases the strength of high-strength lightweight concrete. The effectiveness of this method is determined by a smaller amount of modifier (0.01% by weight) compared to the amount of microfiber, but is limited by the specific strength of high-strength lightweight concrete to 40 MPa.

Keywords: high-strength lightweight concrete, nanosized modifier, nanomodification, fiber-reinforced concrete, defectiveness, fiber, hollow microspheres.

For citation: Inozemtsev A.S., Korolev E.V. Comparative analysis of influence of nanomodification and micro-dispersed reinforcement on the process and parameters of destruction of high-strength lightweight concrete. Stroitel’nye Materialy [Construction Materials]. 2017. No. 7, pp. 11–15. (In Russian).
E.A. SHOSHIN, Candidate of Sciences (Engineering) (shoshin234@mail.ru) Yuri Gagarin State Technical University of Saratov (77, Polytechnicheskaya Street, Saratov, 410054, Russian Federation)

Silicate Filler Obtained by the Method of Thermolysis of Modified Cement Hydrosilicates It is revealed that the thermolysis of cement hydrosilicates of tobermorite series modified with sucrose is accompanied by the destruction of tobermorite structures and the formation of silicate particles with a wide range of sizes. Curves of the distribution of particles in micron, submicron and nano-ranges have been determined by the methods of dynamic light scat- tering and direct measurement of particle sizes. It is also discovered that the type of particle distribution curve depends on the content of modifying carbohydrate and is of non-mono- tonic character. This is presumably due to the effect of differently directed factors: enhancement of coagulation effects and growth of defectiveness of tobermorite structures. The ther- molysis of modified cement hydrosilicates is accompanied by the effect of occlusion of carbohydrate in the silicate matrix and the formation of water-insoluble compounds. This makes it possible to consider the products of thermolysis of modified hydrosilicates as efficient fillers for cement concretes, including high-strength concretes.

Keywords: modified tobermorite, thermolysis, nano-particles, curves of particle distribution, cement concretes.

For citation: Shoshin E.A. Silicate filler obtained by the method of thermolysis of modified cement hydrosilicates. Stroitel’nye Materialy [Construction Materials]. 2017. No. 7, pp. 16–19. (In Russian).

References
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G.S. SLAVCHEVA, Doctor of Sciences (Engineering) (gslavcheva@yandex.ru), E.M. CHERNYSHOV, Doctor of Sciences (Engineering), Academician of RAACS, M.V. NOVIKOV, Candidate of Sciences (Engineering) (novikov2005@mail.ru) Voronezh Technical University University (84, 20-letiya Oktyabrya Street, 394006, Voronezh, Russian Federation)

Thermal Efficient Foam Concretes of a New Generation for Low-Rise Construction The analysis and integration of results of the study complex of foam concretes ρ=800–1600 kg/m 3 of various modifications, system study and evaluation of their functional properties – thermal-physical, strength and stress-related characteristics – are presented. Efficient ways of the use of foam concrete of various modifications in the structures of thermal efficient low-rise houses are shown. Characteristics of foam concretes have been established for calculation of design of structures on their basis with due regard for the influence of long-term processes. The author’s technology “Monopor” based on the use of normally hardening foam concretes with various types of fillers providing the maximum autonomy, mobility of the low-rise monolithic construction is characterized. The perspectiveness of this technology determined by its flexibility and universality is substantiated as its realization ensures the pos- sibility of construction of various types of low-rise buildings with the use of the same range of material and equipment set. The efficiency of the use of this technology when construct- ing low-rise buildings is shown on the basis of the technical-economic assessment.

Keywords: foam concrete, deformability, technology of monolithic low-rise construction.

For citation: Slavcheva G.S., Chernyshov E.M., Novikov M.V. Thermal efficient foam concretes of a new generation for low-rise construction. Stroitel’nye Materialy [Construction Materials]. 2017. No. 7, pp. 20–24. (In Russian).

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S.N. LEONOVICH 1 , Doctor of Sciences (Engineering) (SLeonovich@mail.ru); D.V. SVIRIDOV 2 , Doctor of Sciences (Engineering) (sviridov@bsu.by), A.L. BELANOVICH 2 , Candidate of Sciences (Chemistry) (lab508@mail.ru), V.P. SAVENKO 2 , Engineer, S.A. KARPUSHENKOV 2 , Candidate of Sciences (Chemistry) (karpushenkov@bsu.by)
1 Belarusian National Technical University (65, Nezavisimosty Avenue, Minsk, 220013, Republic of Belarus)
2 Belarusian State University (4, Nezavisimosty Avenue, Minsk, 220030, Republic of Belarus)

A Dry Mix for Producing Refractory Foam Concrete The composition of the dry mix on the basis of a two-component binder (aluminous cement and clay of “Kustikha” deposit), mineral additives (metakaolin, sulfoaluminate modifier RSAM, waste of basalt fiber), foaming agent Ufapore, and accelerating and plasticizing additive “Citrate-T” has been developed. When mixing the mix with water at the water-solid ratio of 0.45–0.7, subsequent mechanical blowing out and hardening of foam mass, refractory foam concretes of 300–650 kg/m 3 density (depending on WATER/AGGREGATE (W/A) ratio, compression strength of 0.2–2.5 MPa before heat treatment, are formed. These compositions obtain the initial strength due to the processes of hydration hardening of aluminous cement that provides the formation of porous structure of foam concretes. The final strength of 0.3–3.2 MPA they gain after burning at 1000 о C. Due to the processes of solid-phase sin- tering of clay with other components of the dry mix during the heating up to 1000 о C, the strength is improved, unlike foam concretes on the basis of Portland cement and aluminous cement. Introduction of the accelerating and plasticizing “Citrate-T” to the dry mix leads to improving rheological properties of the foamed mass and reducing the time of its setting and hardening. The significant role of W/A when producing foam concretes is established: increasing W/A from 0.45 to 0.7 increases the volume of foam mass after blowing out, inhomoge- neity of pores and their sizes that leads to reducing the density of foam concretes and compression strength.

Keywords: dry mixture, refractory foam concrete, mineral additives, foam former, accelerators, plasticizing additive.

For citation: Leonovich S.N., Sviridov D.V., Belanovich A.L., Savenko V.P., Karpushenkov S.A. A dry mix for producing refractory foam concrete. Stroitel’nye Materialy [Construction Materials]. 2017. No. 7, pp. 25–29. (In Russian).

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V.N. DERKACH, Doctor of Sciences (Engineering) (v-derkatch@yandex.ru), Branch of Republican Unitary Enterprise “Institute BelNIIS”, “Scientific-Technical Center” (267/2, Moskovskaya Street, Brest, 224023, Republic of Belarus)

Strength and Deformability of Stone Masonry Made of Cellular Concrete Blocks of Autoclaved Hardening with Polyurethane Joints. Part 2. Bending Tensile Strength Results of the experimental study of bending tensile of the samples of stone masonry made of cellular-concrete blocks with thin-layer polyurethane joints are presented. On the basis of experimental studies, peculiarities of the destruction of experimental samples have been revealed, values of bending tensile strength of stone masonry along bound and unbound sec- tions have been obtained. The level of anisotropy of bending tensile strength of the masonry with polyurethane joints has been determined. It is established that when the bending moment acts perpendicular to the plane of the masonry with polyurethane joints, its destruction is due to the exhaustion of tensile strength of block’s material. The comparison of results obtained with results of the experimental study of the stone masonry made of cellular concrete blocks with thin-layer glue polymer-cement joints has been made. The difference in the destruction nature of masonry samples on polymer-cement glue solution and adhesive foam as well as their strength characteristics at tensile bending are shown.

Keywords: stone masonry, cellular-concrete blocks, polyurethane glue, ending tensile strength, bound section, unbound section.

For citation: Derkach V.N. Strength and deformability of stone masonry made of cellular concrete blocks of autoclaved hardening with polyurethane joints. Part 2. Bending tensile strength. Stroitel’nye Materialy [Construction Materials]. 2017. No. 7, pp. 30–33. (In Russian).

References
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L.I. KASTORNYKH, Candidate of Science (Engineering), A.V. RAUTKIN, Master student, A.S. RAEV, Master student Don State Technical University (1, Gagarina Square, Rostov-on-Don, 344010, Russian Federation)

Effect of Water-Retaining Admixtures on Some Properties of Self-Compacting Concretes Part 1. Rheological Characteristics of Cement Compositions An analysis is made and the development of a single method for assessment of compatibility of superplasticizers and cement according to the rates of bleeding of cement with additives and critical shear stress of cement suspensions is attempted. It is established that the value of bleeding coefficient of cements with superplasticizers and water-retaining agents is differ- ent but the character of bleeding is the same. The introduction of water-retaining additives makes it possible to reduce the bleeding of cements. The use of water-retaining and stabiliz- ing substances leads to increasing the dispersity of a solid phase and the molecular interaction between the particles. This causes the appearance of many contacts between them and leads to the creation of a spatial structural grid that provides the high water-retaining capacity. Selection of the dosages of superplasticizers and water-retaining agents for a particular cement can be assigned according to the value of limit shear stresses of cement suspensions. The increase in ultimate shear stresses of cement compositions with a superplasticizes and water-retaining additive indicates an increase in their water requirement. This factor is necessary to take into account when designing the composition of self-compacting mixes, especially pumped with the use of concrete pumps.

Keywords: bleeding of cement, superplasticizers, water-retaining additives, rheological compatibility of additives and cement, ultimate shear stresses of cement suspensions.

For citation: Kastornykh L.I., Rautkin A.V., Raev A.S. Effect of water-retaining admixtures on some properties of self-compacting concretes. Part 1. Rheological characteristics of cement compositions. Stroitel’nye Materialy [Construction materials]. 2017. No. 7, pp. 34–38. (In Russian).

References
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8. Petrova T.M., Serenko A.F. Determination of the com patibility of cement with additives of surfactants on the kinetics of the limiting shear stress. Tsement i ego primen enie. 2007. No. 5–6, pp. 82–83. (In Russian).
9. Kastornykh L.I., Sinitsyna N.A. The study of the proper ties of lightweight self-compacting concretes. Vestnik of the South Ural state University. Series “Architecture and con struction”. 2014. No. 4. Vol. 14, pp. 47–51. (In Russian).
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R.R. BOGDANOV, Engineer(bogdanov.r.r@yandex.ru), R.A. IBRAGIMOV, Candidate of Sciences (Engineering) Kazan State University of Architecture and Engineering (1, Zelenaya Street, Kazan, 420043, Russian Federation)

Composition, Properties, and Microstructure of Modified Self-Compacting Concrete for Water Proofing of Flat Roofs of Buildings Issues of improving the durability of flat roofs of buildings due to the use of modified self-compacting concrete (SCC) are considered. When modifying SCC, a complex modifier has been developed and the optimization of the composition of the complex modifier with the help of the three-factor experiment has been made. Physical-mechanical properties of SCC obtained have been determined. The microstructure and phase composition of the modified cement stone were studied. On the basis of the research conducted, namely X-ray phase analysis and electronic microscopy, it is concluded that the reduced content of calcium hydroxide in samples with complex modifier is due to adsorption of calcium hydroxide with high-disperse particles and interaction reaction with meta-kaolin that also contributes to reducing the content of calcium hydroxide in the cement stone. The data obtained make it possible to speak about high operational characteristics of SCC. When the flow class is P5, the modified SCC is of compression strength B50, high frost resistance (F600), and water- proofing (W16).

Keywords: self-compacting concrete, hyperplasticizer, hydrophobisator, meta-kaolin, disperse reinforcement.

For citation: Bogdanov R.R., Ibragimov R.A. Composition, properties, and microstructure of modified self-compacting concrete for water proofing of flat roofs of buildings. Stroitel’nye Materialy [Construction Materials]. 2017. No. 7, pp. 39–43. (In Russian).

References
1. Shtein I.I. Novye krovel’nye materialy dlya krupnopanel’nykh krysh [New roofing materials for large-panel roof]. Leningrad: Stroyizdat.1966. 130 p.
2. Patent RF 141336. Bezrulonnaya monolitnaya krovlya [No roll monolithic roof]. Izotov V.S., Ibragimov R.A., Bogdanov R.R., Ibneev B.T. Declared 09.01.2014. Published 27.05.2014. Bulletin No. 15. (In Russian).
3. Kirsanova A.A., Kramar L.YA. Organomineral modifiers on the basis of meta-kaolin for cement concretes.Stroitel’nye Materialy [Construction Materials]. 2013. No. 11, pp. 54–56. (In Russian).
4. Sheinfel’d A.V. Organic-modifiers as a factor that in- creases the durability of reinforced concrete structu- res. Beton i zhelezobeton. 2014. No. 3, pp. 16–21. (In Russian).
5. Kalashnikov V.I., Khvastunov A.V., Khvastunov V.L. Physical and mechanical and hygrometric properties of powder-activated high crush concrete and fiber-rein- forced concrete with a low specific consumption per unit of cement strength. Nauchno-tekhnicheskii vestnik Povolzh’ya. 2011. No. 5, pp. 161–164. (In Russian).
6. Izotov V.S., Ibragimov R.A. Influence of some hyper- plasticizers on the basic properties of cement composi- tions. Stroitel’nye Materialy [Construction Materials]. 2010. No. 11, pp. 14–17. (In Russian).
7. Izotov V.S., Ibragimov R.A., Bogdanov R.R. Studies of the influence of super– and giper plasticizers on the basic properties of cement paste. Izvestiya KazGASU. 2013. No. 2 (24), pp. 221–225. (In Russian).
8. Voytovich V.A., Hryapchenkova I.N. About trends in ap- plication of hydrophobisators in construction (informa- tion). Stroitel’nye Materialy [Construction Materials]. 2015. No. 7, pp. 76–80. (In Russian).
9. Izotov V.S., Ibragimov R.A., Bogdanov R.R. Studies of the influence of domestic water-repelling additions on the basic properties of cement paste and mortar. Izvestiya KazGASU. 2013. No. 4 (26), pp. 207–210. (In Russian).
10. Izotov V.S., Ibragimov R.A., Bogdanov R.R. Properties of modified self-compacting concrete for flat roofs of buildings. Materials of the VIII Academic readings of RAASN “Mechanics of destruction of building materials and structures”. Kazan. 2014, pp. 27–31. (In Russian).
V.V. BELOV, Doctor of Sciences (Engineering) (vladim-bel@yandex.ru), P.V. KULYaEV, Engineer (p.kuliaev@yandex.ru) Tver State Technical University (22, Afanasiy Nikitin Еmbankment, Tver, 170026, Russian Federation)

Principles of Design of Fine Carbonate Concretes with Improved Crack-Resistance Principles of the creation of efficient fine carbonate concretes with improved crack-resistance with the use of local anthropogenic raw materials –wastes of carbonate rocks crushing both as a filler of the optimized grain composition and as a fine-disperse mineral additive, as well as the role of joint application of a limestone filler and the superplasticizer in improving the operational properties of these concretes are considered. The limestone filler and superplasticizer in the composition of a complex additive promote the uniform distribution of the cement inside the mineral matrix of the concrete that positively influences on the process of concrete hardening and formation of its structure and properties. The complex additive reduces the capillary porosity of the composite, at that the fine-disperse limestone filler provides reinforcement of the cement matrix at the micro-level. For qualitative assessment of the concrete crack-resistance, the coefficient of crack-resistance is proposed in a simple and convenient form for analyzing.

Keywords: fine carbonate concrete, coefficient of crack-resistance, micro-plastic deformations.

For citation: Belov V.V., Kulyaev P.V. Principles of design of fine carbonate concretes with improved crack-resistance. Stroitel’nye Materialy [Construction Materials]. 2017. No. 7, pp. 44–47. (In Russian).

References
1. Lesovik V.S., Zagorodnuk L.H., Chulkova I.L., Tolstoy A.D., Volodchenko A.A. Affinity of structures as a theoretical basis for designing composites of the future. Stroitel’nye Materialy [Construction Materials]. 2015. No. 9, pp. 18–22. (In Russian).
2. Lesovik V.S., Zagorodnuk L.H., Tolstoy A.D., Kovale- va I.A. Powdered concrete using technogenic raw materi- als. Vestnik MGSU. 2015. No. 11, pp. 101–109. (In Russian).
3. Lesovik V.S., Akseonova L.L. To the problem of increas- ing the efficiency of operational characteristics of con- crete. Innovative materials and technologies (XX scientific readings) Proceedings of the International Scientific and Practical Conference. Omsk. 2013, pp. 122–124. (In Russian).
4. Tolstoi A.D., Lesovik V.S., Kovaleva I.A. Composite binders for powdered concrete with industrial waste. Vestnik Belgorodskogo gosudarstvennogo tekhnologichesk- ogo universiteta im. V.G. Shukhova. 2016. No. 1, pp. 6–9. (In Russian).
5. Plugin A.A., Kostyuk T.A., Saliya M.G., Bondarenko D.A. Application of carbonate additives in cement com- positions for waterproofing and restoration works of buildings and structures. Collection of scientific works of the Institute of Construction and Architecture MSUCE. Moscow. 2012, pp. 224–227. (In Russian).
6. Uruev V.M., Alekseeva K.N., Solovyeva I.E., Shani- na O.M. Genesis of carbonaceous waste and their charac- teristics. Collection of materials XVI ISTC “Actual prob- lems of construction, construction industry and industry”. Tula. 2015, p. 149. (In Russian).
7. Uruev V.M., Alekseeva K.N., Solovyeva I.E., Shani- na O.M. Investigation of fine-grained concrete with the use of carbonate micro fillers. Collection of materials XVI ISTC “Actual problems of construction, construction indus- try and industry”. Tula. 2015, p. 152. (In Russian).
8. Khozin V.G., Sibgatullin I.R., Khokhryakov O.V., Krasinikova N.M. Production of CNV from man-made waste is an effective way to solve environmental and raw materials problems. Stroitel’nye materialy i izdelija. Kazan. 2012, p. 190. (In Russian).
9. Haritonov A.M. Principles of formation of the structure of composite materials with increased crack resistance. Tehnologii betonov. 2011. No. 3–4, pp. 24–26.
10. Bondarev P.M., Pisarev V.V. The formation of stress zones in a solid under the action of an external force. Tehnologii betonov. 2010. No. 3–4, pp. 60–63. (In Russian).
11. Aleksandrov A.V., Potapov V.D. Osnovy teorii upru- gosti i plastichnosti [Fundamentals of the theory of elasticity and plasticity]. Moscow: Vysshaya shkola. 1990. 400 p.
12. Davidenko A.Yu. Methodology for determining criteria for crack resistance of concrete. Collection of materials of XV Academic readings of RAACS ISTC “Achievements and problems of materials science and modernization of the con- struction industry”. Kazan. 2010. Vol. 2, pp. 18–21. (In Russian).
13. Punagin V.V. Features of formation of deformation char- acteristics of modified monolithic concrete. Suchasni budivel’ni materiali. Vol. 2010–1 (81), pp. 127–130.
14. Moser B, Pfeifer C. Microstructure and Durability of Ultra- High Performance Concrete. Proceedings of the Second International Symposium on Ultra High Performance Concrete. Kassel, Germany. March 05–07, 2008.
To the 120-th Anniversary of the Birth of Moisey Isaevich Khigerovich (Persons of the industry whose jubilees are celebrated)
A.A. GUVALOV 1 , Doctor of Sciences (Engineering) (abbas.quvalov@akkord.az), S.I. ABBASOVA 1 , Candidate of Sciences (Chemistry); T.V. KUZNETSOVA 2 , Doctor of Sciences (Engineering)
1 Azerbaijan University of Architecture and Construction (5, Ayna Sultanova Street, Baku, AZ-1073 Azerbaijan)
2 Dmitry Mendeleev University of Chemical Technology of Russia (9, Miusskaya Square, Moscow, 125047, Russian Federation)

Efficiency of Modifiers When Regulating Properties of Concrete Mixes The use of chemical additives of multifunctional action on the basis of polymers and various salts makes it possible to regulate rheological and technological properties of concrete mixes due to phenomena of adsorption modification of cement grains and product of its hydration. Two types of complex additives of multifunctional action have been developed on the basis of a modified product of the coke chemistry. SAS-2 Additive contains 50–60% of an active binder, 20–25% of salts of uncondensed sulphonic acid, and 20–25% of sodium sul- fate. SAS-3 Additive additionally includes the nitri-lotri-methyl-phosphonic acid. Results show that SAS-2 prolongs the safety of mobility of the concrete mix from an hour up to an hour and a half, SAS-3 – up to 3 and more hours. It is established that SAS-3 is not very sensitive to the mineralogical composition of cements. Despite of slowdown of the initial structure formation concrete with SAS-3 intensively increase the strength in later periods of hardening. The stable effect is provided within a wide range of cement content (350–500 kg/m 3 ) and at different initial mobilities of the concrete mixes.

Keywords: modifier, high-strength concrete, mobility, preservation, mineral additives, density, strength, slump of cone.

For citation: Guvalov A.A., Abbasova S.I., Kuznetsova T.V. Efficiency of modifiers when regulating properties of concrete mixes. Stroitel’nye Materialy [Construction Materials]. 2017. No. 7, pp. 49–51. (In Russian).

References
1. Spitatos N., Rade M., Mailvaganam N. et al. Super- plasticizers for Concrete: Fundamentals, Technology and Practice. Marquis, Quebec, Canada. 2006. 322 p.
2. Batrakov V.G. Modifitsirovannye betony. Teoriya i prak- tika [The modified concrete. Theory and practice]. Moscow: Stroyizdat. 1998. 768 p.
3. Bazhenov Yu.M., Dem’yanova B.C., Kalashnikov V.I. Mo- difitsirovannye vysokokachestvennye betony [The modified high-quality concrete]. Moscow: ASV. 2006. 368 p.
4. Batrakov V.G. Modifiers of concrete: new opportunities and prospects. Stroitel’nye Materialy [Construction mate- rials]. 2006. No. 10, pp. 4–7. (In Russian).
5. Vovk A.I. Hydration of tricalcium aluminate C3 A and mixtures of C3A-gypsum in the presence of surfactants: adsorption or surface phase formation? Kolloidnyi zhur- nal. 2000. Vol. 62. No. 1, pp. 31–38. (In Russian).
6. Izotov V.S., Sokolova Yu.A. Khimicheskie dobavki dlya modifikatsii betona [Chemical additives for concrete modification]. Moscow: Paleotip. 2006. 244 p.
7. Usherov-Marshak A.V., Tsiak M., Pershina L.A. Compatibility of cements with chemical and mineral ad- ditives. Tsement i ego primenenie. 2002. No. 6, pp. 6–8. (In Russian).
8. Guvalov A.A. Management of the structure formation of cement systems with the use of modifiers, The Sixth interna- tional conference “Phase Transformations and Durability of Crystals”. Chernogolovka. 2010, pp. 119. (In Russian).
9. Guvalov A.A., Kabus’ A.V., Usherov-Marshak A.V. Influence of an organo-mineral additive on early hydra- tion of cement. Stroitel’nye materialy [Construction ma- terials]. 2013. No. 9, pp. 94–95. (In Russian).
10. Guvalov A.A. Management of the structure formation of cement systems with polyfunctional superplasticizers. Tekhnika i tekhnologiya silikatov. 2011. No. 3, pp. 24–27. (In Russian).
11. Guvalov A.A. Effect of organomineral modifiers on the strength of concrete. Materialy VI Mezhdunarodnoi nauchnoi konferentsii «Prochnost’ i razrushenie materialov i konstruktsii». Orenburg. 2010, pp. 281–285. (In Russian).
L.A. VAYSBERG1, Doctor of Sciences (Engineering), Academician of RAS, A.N. KOROVNIKOV1, Candidate of Sciences (Engineering); T.M. BALDAEVA2, Engineer
1 Research and Engineering Corporation “Mekhanobr-Tekhnika” (3, 22nd line, V.O., 199106, St. Petersburg, Russian Federation)
2 Saint Petersburg Mining University (2, 21st Line, V.O., 199106, St. Petersburg Russian Federation)

Innovative Screens for Building Materials Industry Along with the crushing units, vibrating screens are key process equipment for producing the crushed stone. The quality of the finished product and also the economy of the production process depend on the perfection of their designs, reliability, and repairability. REC “Mekhanobrtekhnika” develops and produces a wide range of vibrating screens with different designs of boxes, vibration exciters, and sifting surfaces. A standard series of universal inertial screens of GIS type with circular trajectory of vibration of a screen box with an adjustable level of accelerations amplitude in the range of 2.5–5g is presented. A vibration exciter of a block type, the use of which makes it possible to choose the optimal technological mode of the screening process and provide the possibility to efficiently separate the hardly screened and wet materials, is described. An example of the substitution of imported screens with the screens GIS-54 and GIT-72 at the enterprise “Granit-Kuznechnoye” (“LSR-Base Materials-North-West”), which reliable and efficiently operate several years already, is presented.

Keywords: crushed stone, disintegration, screening, screen underflow, rock-crushing plant, vibrating screen, inertial screen, block vibration exciter.

For citation: Vaysberg L.A., Korovnikov A.N., Baldaeva T.M. Innovative screens for building materials industry. Stroitel’nye Materialy [Construction Materials]. 2017. No. 7, pp. 52–55. (In Russian).

References
1. Vaysberg L.A., Orlov S.L., Spiridonov P.A., Korovni- kov A.N., Trofimov V.A. Innovative technologies and equipment for the production of high-quality crushed stone. Dorozhnaya derzhava. 2010. No. 26, pp. 72–75. (In Russian).
2. Vaysberg L.A., Kameneva E.E., Aminov V.N. Assessment of technological capabilities of control over crushed stone quality in the course of disintegration of building rocks. Stroitel’nye Materialy [Construction Materials]. 2013. No. 11, pp. 30–34. (In Russian).
3. Vaysberg L.A. Vibrating screens: research, theory, calcu- lation methods, new constructions. Stroitel’nye i dorozh- nye mashiny. 2003. No. 4, pp. 24–32. (In Russian).
4. Vaysberg L.A., Korovnikov A.N., Trofimov V.A. Modern screens of the Mekhanobr-Tekhnika research and pro- duction corporation for the building materials industry. Stroitel’nye Materialy [Construction Materials]. 2006. No. 12, pp. 26–28. (In Russian).
5. Vaysberg L.A., Korovnikov A.N. New screens for the preparation of mineral raw materials. Marksheideriya i nedropol’zovanie. 2011. No. 6, pp. 26–27. (In Russian).
A.D. SHULOYAKOV, Candidate of Sciences (Engineering) (interstroyproekt@mail.ru) OOO «Interstroyproekt» (128A, Nevsky Prospect, 191036, Saint-Petersburg, Russian Federation)

About Production of High-Quality Cubiform Crushed Stone It is shown that the volume of crushed stone consumption as a main component for road construction and production of building structures made of concrete are constantly growing both in Russia and the whole world. At that, requirements for the quality of products, cost efficiency and sustainability of the production are increased. One of the new requirements for crushed stone is a minimal content of platelet-shaped and needle-shaped grains. A comparative analysis of technical characteristics of various crushing units and techniques on their basis for producing the cubiform crushed stone is presented. It is shown that the most efficient units for producing the cubiform crushed stone are cone inertial crushers developed at Research and Engineering Corporation “Mekhanobrtekhnika”. The scientific basis of vibration crushing technique is revealed. Examples of the successful operation of the cone inertial crushers and vibrating screens at the enterprises of Kazakhstan, where two-stage and one-stage crushing schemes were realized, are presented.

Keywords: cubiform crushed stone, cone inertial crusher, vibration crushing, one-stage crushing, two-stage crushing, reduction range, vibration exciter.

For citation: Shuloyakov A.D. About production of high-quality cubiform crushed stone. Stroitel’nye Materialy [Construction Materials]. 2017. No. 7, pp. 56–59. (In Russian).
А.I. FOMENKO, Doctor of Sciences (Engineering) (fomenko@chsu.ru), V.S. GRYZLOV, Doctor of Sciences (Engineering), N.M. FEDORCHUK, Candidate of Sciences (Engineering), A.G. KAPTYUSHINA, Candidate of Sciences (Engineering) Cherepovets State University (5, Lunacharsky prospect, Cherepovets, 162600, Russian Federation)

Dry Building Mix on the Basis of Phospho-Hemihydrate of Calcium Sulfate The results of theoretical and experimental studies of the application of phospho-hemihydrate of calcium sulfate (PHH), waste of production of wet-process phosphoric acid from apatite concentrate under the hemi-hydrate regime, in the composition of dry building mixes, as a gypsum binder, are presented. The influence of replacing natural gypsum raw materials with anthropogenic PHH on the kinetics of hardening of solutions and physical-technical characteristics of samples of an artificial stone has been studied. Results of the X-ray phase analysis of the PHH composition are presented. It is shown that the phospho-hemihydrate of calcium sulfate can be used for producing dry building mixes without preliminary preparation.

Keywords: phospho-hemihydrate of calcium sulfate, hydraulic activity, admixtures, dry building mix, finishing mortar.

For citation: Fomenko А.I., Gryzlov V.S., Fedorchuk N.M., Kaptyushina A.G. Dry building mix on the basis of phospho-hemihydrate of calcium sulfate. Stroitel’nye Materialy [Construction Materials]. 2017. No. 7, pp. 60–63. (In Russian).
L.I. KHUDYAKOVA, Candidate of Sciences (Engineering) (lkhud@binm.bscnet.ru), O.V. VOILOSHNIKOV, Candidate of Sciences (Engineering) Baikal Institute of Nature Management Siberian branch of the Russian Academy of sciences (BINM SB RAS) (6, Sakhyanovoy Street, 670047, Ulan-Ude, Russian Federation)

Influence of Activation Methods on Properties of Composite Binding Materials The influence of activation methods on the properties of composite binders with the addition of basalt has been studied. It is established that the mechanical mixing of components doesn’t contribute to obtaining the cement stone with high strength properties. When the raw charge is mechanically activated, the high developed chemically active surface of the treat- ed material is formed and the process of its hydration is accelerated. Physical-mechanical characteristics of materials obtained reach the highest values. The samples of binders mechanically activated during 15 minutes and containing 30% of basalt have the best indexes. The process of hydro-mechanical activation depends on the amount of the liquid phase and content of the additive, optimum values of which are 30% and 20% respectively. Ultrasound treatment of the raw charge leads to the instability of the formed spatial structure of the binder. It is confirmed by the low hydration activity and, consequently, low strength values.

Keywords: mechanical activation, hydro-mechanical activation, composite binding materials, basalt.

For citation: Khudyakova L.I., Voiloshnikov O.V. Influence of activation methods on properties of composite binding materials. Stroitel’nye Materialy [Construction materials]. 2017. No. 4, pp. 64–67. (In Russian).
M.A. FROLOVA, Candidate of Sciences (Chemistry), M.V. MOROZOVA, Engineer (m.morozova@narfu.ru), A.M. AIZENSHTADT, Doctor of Sciences (Chemistry), A.S. TUTYGIN, Candidate of Sciences (Engineering) (tutygin@narfu.ru) Northern (Arctic) Federal University named after M.V. Lomonosov (17, Severnaya Dvina Embankment, Arkhangelsk, 163002, Russian Federation)

An Aluminum-Silicate Binder on the Basis of Saponite-Containing Waste of Diamond Industry Results of the experimental study of products of the hydration reaction of saponite-containing wastes separated from the circulating water suspension of the kimberlit ore enrichment process are presented. Preliminary the saponite-containing material was subjected to mechanical activation till the specific surface of over 35000 m 2/kg at the planetary ball mill. It is established by the methods of IR-spectroscopy and scanning electronic microscopy that sub-microcrystals of hydrosilicates of tobermorite group are present in the experimental sam- ples of the binder with a mineral additive of high-disperse saponite-containing material. It is proved that the mechanical activated saponite-containing material is able to form hydrosili- cates of additional generation in the process of concrete hardening. The data obtained make it possible to consider the saponite-containing material not only as a sorbent optimizing the structure formation by means of sorption of the water phase in the process of concrete hardening but also as an active mineral component in binder compositions of a hydration type of hardening.

Keywords: saponite-containing material, mechanical activation, specific surface, scanning electronic microscopy, IR-spectroscopy, hydro-silicates of additional generation.

For citation: Frolova M.A., Morozova M.V., Aizenshtadt A.M., Tutygin A.S. An aluminum-silicate binder on the basis of saponite-containing waste of diamond industry. Stroitel’nye Materialy [Construction Materials]. 2017. No. 7, pp. 68–70. (In Russian).
S.Yu. ANDRONOV, Candidate of Sciences (Engineering) (atomic08@yandex.ru), A.A. ARTEMENKO, Doctor of Sciences (Engineering), A.V. KOCHETKOV, Doctor of Sciences (Engineering), A.A. ZADIRAKА, Engineer Saratov State Technical University named after Yu.A. Gagarin (77, Politekhnicheskaya Street, 410044, Saratov, Russian Federation)

Influence of Method for Basalt Fibers Introduction on Physical-Mechanical Indicators of Composite Asphalt Concrete Mixes The introduction of fibers and threads into the composition of composite asphalt concrete mixes is a method for improving the stability of asphalt concrete to external loads according to domestic and foreign sources. The introduction of long length elements – threads, fibers or wire – at fulfillment and consistency of quality indicators as well the convenience of its use is an insolvable problem at present. The introduction of small size (discrete) elements makes it possible to achieve their uniform distribution (dispersion) in the mixture and to obtain a “composite” material with higher physical-mechanical properties in the finished structural element. In the course of work, experimental compositions of composite disperse- reinforced asphalt concrete mixes were selected, the influence of the method of introducing the basalt fiber into the mix on their properties was determined; experiments on fine-tuning of conditions of preparation and introduction of the fiber into composite asphalt concrete compositions were conducted. The study conducted makes it possible to determine the effi- ciency of the method for introducing the preliminary prepared basalt fiber into the asphalt concrete mix for improving indicators of physical-mechanical properties of asphalt concrete in pavements of highways.

Keywords: composite material, technology of production of disperse-reinforced asphalt concrete mixes, basalt fiber, waste basalt fiber, fibers.

For citation: Andronov S.Yu., Artemenko A.A., Kochetkov A.V., Zadirakа A.A. Influence of method for basalt fibers introduction on physical-mechanical indicators of composite asphalt concrete mixes. Stroitel’nye Materialy [Construction materials]. 2017. No. 7, pp. 71–73. (In Russian).
KNAUF is known as a manufacturer of a wide range of high-quality Construction and finishing materials based on gypsum, as a supplier of complete systems For finishing premises, as a developer of a number of professional standards and co-author Normative documents ... But almost the most important contribution of KNAUF to development Russian construction materials industry is the introduction, approval And the constant development of a high culture of production and business.
A.Ya. YUN, Manager, Marketing Department OOO «Saint-Gobain Building Products Rus» (8, Preobrazhenskaya Square, 107061, Moscow, Russian Federation)

Analysis of Efficiency of Two-Layer and One-Layer Heat Insulation of Ventilated Facades Two variants of the heat insulation of one of the most efficient solutions of heat insulation of an enclosing structure, suspended ventilated facades, are compared. Two variants of the arrangement of a heat insulation contour, a mono-layer, when the heat losses through the junction joints of heat insulation slabs are unavoidable, and a two-layer where the upper layer of slabs overlaps the junction place of the lower layer slabs, are considered. The calculation method with the use of the specialized software HEAT 3D shows, on the example of an objects located in the city of Novosibirsk, that from the point of view of heat insulation of buildings, the two-layer heat insulation of ventilated facades is more efficient than the one-lay- er as makes it possible to improve the thermal-technical homogeneity by 37% and reduce the heat losses through the slab joints by 10 times.

Keywords: energy saving, heat insulation, suspended ventilated facade, energy efficient solution, thermal-technical homogeneity.

For citation: Yun A.Ya. Analysis of efficiency of two-layer and one-layer heat insulation of ventilated facades. Stroitel’nye Materialy [Construction Materials]. 2017. No. 7, pp. 77–79. (In Russian).
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