Stroitel`nye Materialy №11

Stroitel`nye Materialy №11
November, 2017

Table of contents

S.S. KAPRIELOV, Doctor of Sciences (Engineering) (, A.V. SHEINFELD, Doctor of Sciences (Engi-neering), V.G. DONDUKOV, Engineer NIIZHB named after A.A. Gvozdev, JSC Research Center of Construction (6, 2nd Institutskaya Street, 109428, Moscow, Russian Federation)

Cements and Additives for Producing High-Strength Concretes On the basis of the analysis of the formation mechanism of the high-strength structure of cement stone which means the directed regulation of the phase composition and differential porosity, the efficiency of water-reducing admixtures for producing high-strength concretes has been determined. It is established that an alternative to cement of increased activity with the special chemical-mineralogical composition can be ordinary Portland cement of TSEM 1 type which is used in combination with high-active mineral additives and super-plasticizers or in combination with poly-component organic-mineral modifiers of MB type containing all ingredients required for achieving the high strength. Conclusions made on the basis of analysis that for producing concretes of grades up to B 120 materials traditional for building industry can be used made it possible in a short time to organize in Russia the mass production of high-strength concretes.

Keywords: cement, additive, super-plasticizer, organo-mineral modifier, cement stone, phase composition, porosity, high-strength concrete.

For citation: Kaprielov S.S., Sheinfeld A.V., Dondukov V.G. Cements and additives for producing high-strength concretes. Stroitel’nye Materialy [Construction Materials]. 2017. No. 11, pp. 4–10. (In Russian).

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The XXIV Session of the ISO/TC 71 «Concrete, Reinforced Concrete, Pre-Stressed Concrete» International Technical Committee for the first time will be held in Moscow in May 2018
S.N. LEONOVICH1, Doctor of Sciences (Engineering), Foreign Member of RAACS; D.A. LITVINOVSKIY2, Head Engineer (
1 Belarusian National Technical University (65, Nezavisimosti Avenu, Minsk, 220013, Belarus)
2 «InzhSpecStroyProekt» OOO (Rom 210, 22, L. Mstislavca Street, Minsk, 220114, Belarus)

Destruction Viscosity of High-Strength Concrete after High Temperature Impact The impact of high temperature on high-strength concrete leads to the appearance of brittle fracture of an explosive character which is necessary to predict and regulate. For this purpose, the methodology on the basis of destruction mechanics has been developed, and criteria of the evaluation of viscosity and brittleness of high-strength concrete and steel-fiber concrete has been proposed to exclude the explosive fracture under the high temperature impact. The experimental multi-parametric evaluation of residual properties of strength, deformation, force, and energetic parameters of high-strength concrete has been made in the temperature range of 100–700°C. Criteria of the appearance of explosive destruction of highstrength concrete for produced and operated structures are proposed in terms of force and energetic parameters of fracture mechanics at a normal temperature.

Keywords: high-strength concrete, steel-fiber concrete, explosive fracture, viscosity of destruction, crack resistance, destruction energy.

For citation: Leonovich S.N., Litvinovskiy D.A. Destruction viscosity of high-strength concrete after high temperature impact. Stroitel’nye Materialy [Construction Materials]. 2017. No. 11, pp. 12–17. (In Russian).

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2. Patent BY 16194. Sposob opredeleniya kriticheskogo koeffitsienta intensivnosti napryazheniya vysokoprochnogo betona [The method of determining the critical stress intensity factor of high strength concrete]. Leonovich S.N., Litvinovsky D.A. Declared 30.03.2010. Published 30.08.2012. (In Russian).
3. Patent BY 19170. Sposob opredeleniya kriticheskogo koeffitsienta intensivnosti napryazheniya vysokoprochnogo betona [The method of determining the critical stress intensity factor of high strength concrete]. Leonovich S.N., Litvinovsky D.A. Published 30.06.2015. (In Russian).
4. Patent RU 2621618. Sposob opredeleniya kriticheskogo koeffitsienta intensivnosti napryazheniya vysokoprochnogo betona [The method of determining the critical stress intensity factor of high strength concrete]. Leonovich S.N., Litvinovsky D.A., Kim L.V. Published 06.06.2017. (In Russian).
5. Patent RU 2621623. Sposob opredeleniya kriticheskogo koeffitsienta intensivnosti napryazheniya vysokoprochnogo betona [The method of determining the critical stress intensity factor of high strength concrete]. Leonovich S.N., Litvinovsky D.A., Kim L.V. Published 06.06.2017. (In Russian).
6. Litvinovsky D.A., Zverev V.F., Leonovich S.N. Studies of mechanical properties of high-quality concrete in conditions of high-temperature heating. Problems of implementation of design standards and European Union standards in construction: collection of scientific works.-tech. article (scientific and method. seminar). Minsk. 29 may 2012. Part 2, pp. 84–91. (In Russian).
7. Leonovich S.N., Litvinovsky D.A. Analytical dependences of strength, deformation, force and energy parameters of heated high-strength concrete. Vestnik Belorusskogo natsional’nogo tekhnicheskogo universiteta. 2011. No. 4, pp. 30–34. (In Russian).
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9. Leonovich S.N., Zverev V.F., Litvinovsky D.A. Criteria of brittle fracture of high-strength concrete. Fracture Mechanics of materials and structures: proceedings of the VIII Academicals readings RAACS. Kazan. 2014, pp. 169–173. (In Russian).
10. Litvinovsky D.A., Leonovich S.N. Criteria of brittle strength of structural concrete at high temperatures: design manufactured and operated. Technology of construction and reconstruction: a collection of works BNTU. Minsk. 2017, pp. 293–301. (In Russian).
B.V. GUSEV1, Doctor of Sciences (Engineering), Academician of Russian Academy of Engineering, Corresponding Member of Russian Academy of Sciences, A.I. ZVEZDOV2, Doctor of Sciences (Engineering), Academician of Russian Academy of Engineering, (
1 Russian University of Transport (MIIT) (9, bldg. 9. Obrazcova Street, 127994, Moscow, Russian Federation)
2 JSC Research Center of Construction (6, 2nd Institutskaya Street, 109428, Moscow, Russian Federation)

Theoretical and Experimental Studies of Statistical Issues of Concrete Strength Concretes are multi-component systems where elements of the internal structure are formed. These elements (clusters) are situated along and across the direction of action of a destructive force and to solve the statistical task they are represented in the form of structures according to both schemes of «a chain» and «a rope». The article present the formulas for assessing the average value of strength and average square deviation of the strength value for structural elements as well as statistical values defining properties of a large massif (volume) of a sample or structure. Formulas for defining the strength and coefficient of strength variation for any complex system which are various combinations of the «chain» and «rope» schemes at any general distribution of the strength of elements as random values have been obtained. Check of theoretical hypotheses was carried out by experimental results.

Keywords: statistical strength, average value (expectation value) of strength, coefficients of strength variation, structural element, composite sample (massif), «chain» and «rope» schemes, experimental studies.

For citation: Gusev B.V., Zvezdov A.I. Theoretical and experimental studies of statistical issues of concrete strength. Stroitel’nye Materialy [Construction Materials]. 2017. No. 11, pp. 18–21. (In Russian).

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

Effect of Water-Retaining Additives on Some Properties of Self-Compacting Concretes. Part 2. Rheological Characteristics of Concrete Mixes and Strength of Self-Compacting Concretes Estimation of the effect of water-retaining additives on the rheological characteristics of self-compacting mixes and physical-chemical properties of self-compacting concretes (SCC) is made. The effect of increasing spreadability is noted after certain period of time for heavy and fine concrete mixes on the cement PTS500 DO N with the complex of additives of superplasticizer+stabilizer under the condition of providing the equal mobility. Such nature of the action of water-retaining additive improves the keeping – ability of the mix to self-compaction – by two times. When introducing the complex of superplasticizer-stabilizer in the light concrete self-compacting mix, the effect of increasing spreadability is absent and t the reduction in the average density of the mix occurs. The analysis of curves of change in the flowability of concrete mixes shows the ambiguous effect of water-retaining additives and testifies the necessity of additional experimental verification of their interaction with the cement of a concrete type. The kinetics of the change in shear yield stress of self-compacting mixes with water-retaining additives confirms the mechanism of action of stabilizers which is reducing the velocity of cement hydration and increasing the keeping of mixes. In the course of studies, the high water-retaining effect of stabilizers which leads to the growth of water consumption of concrete mixes and reduction in the strength of concrete is established. When supplying SCC with the complex of additives, superplasticizer+water-retaining additive, it is necessary to present the curve of change in flowability of the mix in time.

Keywords: self-compacting concretes, superplasticizer, water-retaining additive, complex additive, rheological characteristics, effect of increasing of mixes spreadability, limiting shear stresses.

For citation: L.I. Kastornykh, I.A. Detochenko, E.S. Arinina. Effect of water-retaining additives on some properties of self-compacting concretes. Part 2. Rheological characteristics of concrete mixes and strength of self-compacting concretes. Stroitel’nye Materialy [Construction Materials]. 2017. No. 11, pp. 22–27. (In Russian).

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The First Scientific-Technical «Gvozdev Readings»
V.G. KHOZIN, Doctor of Sciences (Engineering) (, A.R. GIZDATULLIN, Engineer ( Kazan State University of Architecture and Engineering (1, Zelenaya Street, Kazan, 420043, Russian Federation)

Compatibility of Polymer-Composite Reinforcement with Cement Concrete in Structures The adhesion of fiberglass reinforcement of industrially produced profiles with cement concrete under the impact of some technological and operational factors has been studied. A significant difference in the fracture characteristics of both materials in the zone of their contact, which depends on the type of surface profile of the reinforcement, concrete grade and the aggressiveness of the external environment, has been established. The best results concerning the adhesion strength were obtained for the polymer-composite reinforcement (PCR) with “sunken” screw and “sandy” profiles. The tests of concrete beams with difference scheme of reinforcement made it possible to discover an “effect of small diameters” which expresses in the increased rigidity and bearing capacity of beams with a smaller diameter of PCR in cross-section due to more complete inclusion of them in operation under loading. Technological recommendations on production of PCR and recommendations on design of flexural products and their calculation are made.

Keywords: polymer-composite reinforcement, cement concrete, adhesion, aggressive environment, reinforced beams, flexural rigidity.

For citation: Khozin V.G., Gizdatullin A.R. Compatibility of polymer-composite reinforcement with cement concrete in structures. Stroitel’nye Materialy [Construction Materials]. 2017. No. 11, pp. 30–38. (In Russian).

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M.A. GONCHAROVA, Doctor of Sciences (Engineering) (; I.A. TKACHEVA, Engineer Lipetsk State Technical University (30, Moskovskaya Street, Lipetsk, 398600, Russian Federation)

The Use of Adhesion Additives in Asphalt Concrete with Granite and Slag Crushed Stone The paper presents the research in adhesion quality of bituminous binders with various types of adhesive additives both with granite and slag crushed stones. The concept of adhesion of a binding substance and stone materials, reasons for their weak interaction as well as a way for efficient increasing the adhesion – the use of special additives – are considered. The aim of the study is to determine the optimum additive for the basic blast furnace slag and granite with acidic nature. In the course of the work, it has been found that both active and passive adhesions are achieved with the use of adhesive additives. In addition, a number of properties of asphalt concrete, as a final composite, improve. Brief characteristics of the tested materials are given, the stages of the experiment conducted are described, visual results of laboratory tests and their analysis are presented.

Keywords: adhesion, adhesive additive, coupling, granite crushed stone, slag crushed stone.

For citation: Goncharova M.A., Tkacheva I.A. The use of adhesion additives in asphalt concrete with granite and slag crushed stone. Stroitel’nye Materialy [Construction Materials]. 2017. No. 11, pp. 39–41. (In Russian).

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V.G. KUZNETSOV, President, General Director (, I.P. KUZNETSOV, Commercial Director ( OOO «As-Tik KP» (16, Teterinsky Lane, Moscow, 109004, Russian Federation)

Recommendations for Installation and Fastening of Lining PPFP-Astiki at Industrial Equipment Operating with Moistened Materials As a result of the analysis of operation of equipment used under different mining-geological and mining-technical conditions of operation, it is established that the correctly selected lining materials reliably and efficiently protect the operating surfaces. The most efficient in this segment are sheets-Astike (PPFP-Astiki). They protect operating surfaces both against sticking and full gumming of equipment units, and constructibility of installation and fastening of sheet provides its workability during the interrepair period. The article describes main requirements and recommendations for its industrial installation and fastening on excavator, transport, and technological equipment, as well as presents the variants of schemes of fastening of anti-gumming sheets on operating surfaces of equipment. The use of PPFP-Astiki increases the discharge capacity of load-transfer devices, hoppers, batchers, and other elements on average by 1.6 times, technical performance of excavator technique by 1.3 times as well as significantly reduces hand labor used when cleaning equipment units.

Keywords: mining industry, anti-gumming lining PPFP-Astiki, industrial equipment, rock, moistened materials.

For citation: Kuznetsov V.G., Kuznetsov I.P. Recommendations for installation and fastening of lining PPFP-astiki at industrial equipment operating with moistened materials. Stroitel’nye Materialy [Construction Materials]. 2017. No. 11, pp. 43–46. (In Russian).

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8. Kuznetsov V.G., Novikova T.N., Kuznetsov I.P., Kochetov E.V. Enhancement of efficiency of using mountain-transport and technological equipmentof nonferrous metallurgy enterprises on wetted sticky materials. Stroitel’nye Materialy [Construction Materials]. 2011. No. 1–2, pp. 84–87. (In Russian).
9. Kuznetsov V.G., Kuznetsov I.P., Lyapunov A.V., Blyudenov A.P., Gontarenko B.Yu. The use of polymeric materials to eliminate the buildup of wet magnetitic concentrate on work surfaces of equipment on enrichment plant AO «EVRAZ KGOK». Stroitel’nye Materialy [Construction Materials]. 2016. No. 6, pp. 59–60. (In Russian).
10. Kuznetsov V.G., Kuznetsov I.P. To the issue of reliable and efficient application of PPFP-Astiki at equipment operating with damp materials. Stroitel’nye Materialy [Construction Materials]. 2016. No. 8, pp. 45–48. (In Russian).
11. Kuznetsov V.G., Novikova T.N., Kuznetsov I.P. Polymer anti-lamination lining plates are an effective means of eliminating (reducing) adherence of moistened rocks. Zolotodobycha. 2008. No. 112, pp. 32–35. (In Russian).
12. Kuznetsov V.G., Novikova T.N., Kuznetsov I.P. i dr. Polimernye protivonalipayushchie futerovochnye plastiny – Astiki – effektivnoe reshenie problemy ustraneniya nalipaniya uvlazhnennykh materialov na rabochie poverkhnosti oborudovaniya [Polymer anti-lamination lining plates – Astiki – an effective solution to the problem of eliminating the sticking of moistened materials on the working surfaces of equipment]. Moscow: OOO «Nadezhda na Yartsevskoi». 2013. 79 p.
13. Kuznetsov V.G., Kuznetsov I.P. Sealing arrangement made of PPFP-Astiki for receiving hoppers of belt conveyers. Stroitel’nye Materialy [Construction Materials]. 2017. No. 5, pp. 60–62. (In Russian).
14. Kuznetsov V.G., Kochetov E.V., Kuznetsov I.P. Evaluation of the reduction in the production capacity of equipment due to the adhesion of soils to the work surfaces. Mekhanizatsiya Stroitel’stva. 2012. No. 3, pp. 33–35. (In Russian).
15. Kuznetsov V.G., Kochetov E.V., Kuznetsov I.P. Increasing the efficiency of the use of construction equipment on wet ground. Stroitel’nye Materialy [Construction Materials]. 2012. No. 4, pp. 60–62. (In Russian).
I.F. SHLEGEL, Candidate of Sciences (Engineering), Director (, S.G. MAKAROV, Engineer, Head of Department, A.M. VASYAKIN, Head Engineer-designer Institute of New Technologies and Automation of Building Materials Industry (OOO «INTA-STROY») (100, 1-ya Putevaya Street, 644113, Omsk, Russian Federation)

Enhancement of «Kaskad» Units The enterprise-producer permanently enhances the produced unit «Kaskad» and adds some options improving the operation of the unit. The results of experiments on the use of the «Kaskad» unit as a granulator for producing fertilizers are presented. The use of special grills and knives with a changing geometry of the working edge as well as the use of the variable, reducing step in the screw part of the unit with simultaneous increasing the drive power makes it possible to produce, on the base of the «Kaskad» unit, a new machine for granulation of raw materials – «Kaskad-granulator».

Keywords: clay processing, clay preparation, enhancement of «Kaskad» units, mechanism of removal of rocky inclusions, feeder, granulator of fertilizers, granulation of raw materials, prevention of clay adhesion in loading entry of screw.

For citation: Shlegel I.F., Makarov S.G., Vasyakin A.M. Enhancement of «Kaskad» units. Stroitel’nye Materialy [Construction Materials]. 2017. No. 11, pp. 47–49. (In Russian).

Список литературы
1. Shlegel I.F., Shaevich G.Ja., Karabut L.A., Pashkova E.B., Spitanov V.V., Astafjev V.A. «Kaskad» for the brick industry. Stroitel’nye Materialy [Construction Materials]. 2005. No. 2, pp. 20–22. (In Russian)
2. Shlegel I.F., Shaevich G.Ja., Astafjev V.A., Karabut L.A. Industrial «Kaskade-13» for clay mixing. Stroitel’nye Materialy [Construction Materials]. 2005. No. 10, pp. 30–31. (In Russian).
3. Patent RF 2297324. Ustroistvo dlya izmelcheniya I peremeshivaniya plastichnyh materialov preimushchestvenno gliny [The device for chopping and mixing of ductile materials, predominantly clay]. Shlegel’ I.F. Declared 24.11.2004. Published 20.04.2007. Bulletin No. 11. (In Russian).
4. Patent RF 2384401. Ustroistvo dlya izmelcheniya I peremeshivaniya plastichnyh materialov preimushchestvenno gliny [The device for chopping and mixing of ductile materials, predominantly clay]. Shlegel’ I.F. Declared 06.11.2008. Published 20.03.2010. Bulletin No. 8. (In Russian).
5. Patent RF 2411122. Ustroistvo dlya izmelcheniya I peremeshivaniya plastichnyh materialov preimushchestvenno gliny [The device for chopping and mixing of ductile materials, predominantly clay]. Shlegel’ I.F. Declared 06.11.2008. Published 10.02.2011. Bulletin No. 4. (In Russian).
6. Patent RF 2435664. Ustroistvo dlya izmelcheniya plastichnyh materialov [The device for mixing of ductile materials]. Shlegel’ I.F. Declared 15.03.2010. Published 10.12.2011. Bulletin No. 34. (In Russian).
7. Patent RF 2548879 Rezhushchij blok dlya ustrojstva izmelcheniya plastichnyh materialov [The cutter grinding device for plastic materials]. Shlegel’ I.F. Declared 20.04.2015. Published 10.12.2011. Bulletin No. 11. (In Russian).
8. Patent RF 2621821. Ustrojstvo dlya udaleniya kamenistyh vklyuchenij [The device for removing stony inclusions]. Shlegel’ I.F. Declared 17.05.2016. Published 07.06.2017. Bulletin No. 16. (In Russian).
9. Patent RF 2619702. Mehanizm podachi materiala v shnekovye ustrojstva [The material feeder in the screw device]. Shlegel’ I.F., Rukavicin A.V., Applicant and patentee LLC INTA-STROY Declared 31.05.2016. Published 17.05.2017. Bulletin No. 14. (In Russian).
10. Shlegel I.F., Shaevich G.Ja., Noskov A.V., Astafjev V.A., Andrianov A.V., Molodkina L.N. The new generation of clay processing «Kaskad». Stroitel’nye Materialy [Construction Materials]. 2008. No. 4, pp. 34–35. (In Russian).
11. Shlegel I.F., Shaevich G.Ja., Gudalov O.V. Prospects for the use of «Kaskad» of in the technology of production of refractories. Novye ogneupory. 2008. No. 12, pp. 64–66.
12. Shlegel I.F., Rukavicin A.V., Andrianov A.V. The use of «Kaskad» in the technology of semi-dry pressing bricks. Stroitel’nye Materialy [Construction Materials]. 2010. No. 4, pp. 58–59. (In Russian).
13. Gorin V.M., Tokareva S.A., Kabanova M.K. Status and prospect of production and application of expanded clay and expanded clay concrete in Russia. Stroitel’nye Materialy [Construction Materials]. 2005. No. 8, pp. 26–27. (In Russian).
I.A. STAROVOJTOVA1, Candidate of Sciences (Engineering) (; A.N. SEMJONOV2, Engineer, E.S. ZYKOVA2, Engineer; V.G. HOZIN1, Doctor of Sciences (Engineering), A.M. SULEJMANOV1, Doctor of Sciences (Engineering)
1 Kazan State University of Architecture and Engineering (1, Zelenaya Street, Kazan, 420043, Republic of Tatarstan, Russian Federation)
2 The Research and Development Company «Rekon», ООО (Build. 7, 100, Vosstaniya Street, Technopolis «Himgrad», 420095, Republic of Tatarstan, Russian Federation)

Modified Glue Binders for Systems of External Reinforcement of Building Structures Part 1. Requirements for Glues. Technological Characteristics A general characteristic of the technology for strengthening building structures by the systems of external reinforcement with the use of polymer composite materials is presented. Requirements of the normative documentation for glue binders are given. Modification of epoxy resin and optimization of the composition of mixed hardener made it possible to develop compositions of glues, technological for using when making the external reinforcement systems. The effect оf reducing the viscosity of epoxy resins, when introducing in compositions of the single-layer and multi-layer carbon nanotubes, is revealed. Pilot tests of the developed compositions of glue binders in preparation volumes of 50–100 kg were conducted; their technological effectiveness was confirmed.

Keywords: external reinforcement systems, strengthening of building structures, glue binders, epoxy resins, modification.

For citation: Starovojtova I.A., Semjonov A.N., Zykova E.S., Hozin V.G., Sulejmanov A.M. Modified glue binders for systems of external reinforcement of building structures. Part 1. Requirements for glues. Technological characteristics. Stroitel’nye Materialy [Construction Materials]. 2017. No. 11, pp. 50–54. (In Russian).

1. Shilin A.A., Pshenichnyi V.A., Kartuzov D.V. Vneshnee armirovanie zhelezobetonnykh konstruktsii kompozitsionnymi materialami [External reinforcement of reinforced concrete structures with composite materials]. Moscow: Stroyizdat. 2007. 179 p.
2. Golyshev A.B., Tkachenko I.N. Proektirovanie usilenii nesushchikh zhelezobetonnykh konstruktsii proizvodstvennykh zdanii i sooruzhenii [Engineering of reinforcements for reinforced concrete structures of industrial buildings and structures]. Kiev: Logos. 2001. 172 p.
3. Ovchinnikov I.I., Ovchinnikov I.G., Tatiev D.A., Chesnokov G.V., Pokulaev K.V. Strengthening of metal structures by fibro-reinforced plastics: Part 1. The state of the problem. Internet-zhurnal Naukovedenie. 2014. No. 3 (22), pp. 117–144. (In Russian).
4. Nevolin D.G., Smerdov D.N., Smerdov M.N. Usilenie zhelezobetonnyh konstrukcij zdanij i sooruzhenij razlichnogo naznachenija polimernymi kompozicionnymi materialami [Strengthening of reinforced concrete structures ofbuildings and structures for various purposes with polymeric composite materials]. Ekaterinburg: UrGUPS. 2017. 151 p.
5. Ovchinnikov I.G., Valiev Sh.N., Ovchinnikov I.I., Zinov’ev V.S., Umirov A.D. Questions of reinforcement of reinforced concrete structures by composites: 1. Experimental studies of the features of strengthening by composites of bent reinforced concrete structures. Internet-zhurnal «Naukovedenie». 2012. No. 4, pp. 1–22. (In Russian).
6. Halturin Ju. V., Kuzovenko A. V. Use of composite materials in the reconstruction of buildings and structures. Vestnik AltGTU im. I.I. Polzunova. 2014. No. 1–2, pp. 51–54. (In Russian).
7. Gaponov V.V. Strengthening of bent ferro-concrete structures of underground constructions by composite materials. Gornyj informacionno-analiticheskij bjulleten’ (nauchnotehnicheskij zhurnal). 2011. No. 12, рр. 238–246. (In Russian).
8. Wagner E.S. Strengthening of reinforced concrete structures with composite materials. Dostizhenija vuzovskoj nauki. 2015. No. 15, pp. 119–123. (In Russian).
9. Stepanishchev N.A., Tarasov V.A. Strengthening the polyester matrix with carbon nanotubes. Vestnik MGTU im. N. E. Baumana. Ser. “Priborostroenie”. Spts. vipusk “Nanoinzheneriya”. 2010. pp. 53–65. (In Russian).
10. Stepanishchev N.A. Technology of ultrasonic modification with carbon nanotubes of polyester binder for the manufacture of composite structures. Cand. Diss. (Engineering). Moscow. 2013. 117 p. (In Russian).
M.A. AVDUSHEVA, Engineer (, A.L. NEVZOROV, Doctor of Sciences (Engineering) ( Northern (Arctic) Federal University named after M.V. Lomonosov (17, Severnaya Dvina Embankment, Arkhangelsk, 163002, Russian Federation)

Influence of Magnetite on Electrical Conductivity of Mortar Mix Results of the study of influence of a magnetite additive on the electric conductivity of mortar mix and strength characteristics of cement mortar after hardening are presented. The research was conducted when the magnetite powder of different dispersion was included in the mortar composition. Particles of magnetite of the size smaller that 0.1 mm were used as the first additive. The fine powder with the size of particles of 258±74 nm, obtained as a result of grinding the magnetite at the planetary ball mill, served as the second additive. Measuring the electrical conductivity of the mortar mix was carried out at the current frequency of 25 Hz – 1 kHz. Introduction of the magnetite powder in an amount of 1–20% of the cement mass in the composition of the mortar mix improves its electric conductivity, in particular, the current frequency of 50 Hz by 8–70%, at the current frequency of 120 Hz by 25–100%. The increase in the flexural strength of samples with addition of 3% of magnetite powder is 18.5%, when compressing – 30%. The introduction of the same amount of finely dispersed magnetite has led to increasing the flexural strength up to by 40%, compressive strength – up to by 20%.

Keywords: cement mortar, magnetite, modifying additives, finely dispersed powder, electric conductivity.

For citation: Avdusheva M.A., Nevzorov A.L. Influence of magnetite on electrical conductivity of mortar mix. Stroitel’nye Materialy [Construction Materials]. 2017. No. 11, pp. 55–58. (In Russian).

Список литературы / References
1. Chung D.D.L. Electrically conductive cement-based materials. Advances in Cement Research. 2014. Vol. 16. No. 4, pp. 167–176.
2. Silvestre J., Silvestre N., de Brito J. Review on concrete nanotechnology. European Journal of Environmental and Civil Engineering. 2016. Vol. 20. No. 4, pp. 455–485.
3. Nivethitha D., Srividhya S., Dharmar S. Review on mechanical properties of cement mortar enhanced with nanoparticles. International Journal of Science and Research (IJSR). 2016. Vol. 5. Iss. 1, pp. 913–916. https://
4. Ильичев В.А., Мангушев Р.А. Справочник геотехни- ка. Основания, фундаменты и подземные сооруже- ния. М.: АВС, 2016. 1040 с.
4. Ilichev V.A., Mangushev R.A. Spravochnik geotekhnika. Osnovaniya, fundamenty i podzemnye sooruzheniya [Geotechnical handbook. Foundations engineering and underground constructions]. Moscow: АВС. 2016. 1040 p.
5. Borucka-Lipska J., Kierno ycki W., Guskos N., Dudek M.R., Ho D.Q., Wolak W., Mar M., Kozio J.J., Kalaga J.K. On magnetite concentrate grains with respect to their use in concrete. International Journal of Engineering Research & Science. 2016. Vol. 2, pp. 97–103.
6. Lee H.-S., Kwon S.-J. Effects of magnetite aggregate and steel powder on thermal conductivity and porosity in concrete for nuclear power plant. Advances in Materials Science and Engineering. 2016 Vol. 2016. http://dx.doi. org/10.1155/2016/9526251.
7. Sikora P., Horszczaruk E., Cendrowski K., Mijowska E. The influence of nano-Fe3O4 on the microstructure and mechanical properties of cementitious composites. Nanoscale Research Letters. 2016. Vol. 11. DOI: 10.1186/ s11671-016-1401-1.
8. Лесовик Р.В., Агеева М.С., Чернышева Н.В. Акти вация мелкозернистого бетона на железосодержа- щих техногенных песках магнитным полем // Вестник БГТУ им. В.Г. Шухова. 2011. № 1. С. 24–28.
8. Lesovik, R.V., Ageeva M.S., Chernysheva N.V. Activation of fine-grained concrete containing ferriferous technogenic sands by magnetic field. Vestnik BGTU im. V.G. Shukhova. 2011. No. 1, pp. 24–28. (In Russian).
9. Amin M.S., El-Gamal S.M.A., Hashem F.S. Effect of addition of nano-magnetite on the hydration characteristics of hardened Portland cement and high slag cement pastes. Journal of Thermal Analysis and Calorimetry. Vol. 112, No. 3, pp. 1253–1259. https://doi. org/10.1007/s10973-012-2663-1.
M.A. SAVEL’EVA, Engineer (, L.A. URKHANOVA, Doctor of Sciences (Engineering) (, P.K. KHARDAEV, Doctor of Sciences (Engineering) East Siberia State University of Technology and Management (40V, Klyuchevskaya Street, Ulan-Ude, 670013, Russian Federation)

Prospects of Application of Colloidal Additives for Modifying Cement Stone At the present ecological situation, the problem of growing volumes of sulfur-containing waste can be solved by means of introducing the products of waste processing in the field of construction material science, for creation of concretes of a new generation in particular. Improved building-technical properties of these concretes can be achieved due to the introduction of high-disperse additives which make it possible to optimize the structure of cement and concrete materials. The article presents the results of experimental studies of the effect of a sulfur sol obtained by two different methods on the change in the structure and properties of the cement stone. When introducing the optimum amount of the sulfur sol, the acceleration of hydration and hardening, improvement of the cement stone strength take place. According to the results of electronic-microscopic and X-ray phase analyzes, differentially scanning calorimetry, it is established that the change in the microstructure of the cement stone is connected with the formation of complex combinations of sulfur and calcium.

Keywords: cement, concretes, sulfur sol, colloidal additives, high-disperse additives.

For citation: Savel’eva M.A., Urkhanova L.A., Khardaev P.K. Prospects of application of colloidal additives for modifying cement stone. Stroitel’nye Materialy [Construction Materials]. 2017. No. 11, pp. 59–63. (In Russian).

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A.I. NIZHEGORODOV, Doctor of Sciences (Engineering) ( Irkutsk National Research Technical University (83, Lermontova Street, 664074, Irkutsk, Russian Federation)

Stability of Compacted Vermiculite Masses in Three-Layer Walls under Critical Conditions The article deals with the properties of exfoliated vermiculite: strength in the cylinder and an angle of dip under the external load as determining factors of resistance to shrinkage of the vermiculite mass compacted under constrained conditions when the water saturation is over 300% and the action of vibration. Results of the natural experiment showing that the mass preliminary compacted by 7–18% doesn’t shrink even under such critical conditions are presented. The results of calculations and data of experiments show that when warming the inner space of walls with compacted vermiculite, the insulation material shrinkage is excluded by almost fivefold strength reserve and additional adhesion of the material with surfaces of walls.

Keywords: vermiculite, vermiculite mass, strength in cylinder, angle of dip, resistance to shrinkage.

For citation: Nizhegorodov A.I. Stability of compacted vermiculite masses in three-layer walls under critical conditions. Stroitel’nye Materialy [Construction Materials]. 2017. No. 11, pp. 64–67. (In Russian).

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