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TECHNOLOGY OF CONSTRUCTION PROCEDURES. MECHANISMS AND EQUIPMENT

SYSTEM OF CONTROL OVER THE CONDITION OF HYDRAULIC ENGINEERING STRUCTURES

Vestnik MGSU 7/2012
  • Bal'zannikov Mikhail Ivanovich - Samara State University of Architecture and Civil Engineering (SSUACE) Doctor of Technical Sciences, Professor, Chair, Department of Environmental Protection and Hydraulic Engineering Structures, Rector, +7 (846) 242-17-84, Samara State University of Architecture and Civil Engineering (SSUACE), 194 Molodogvardeyskaya St., Samara, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Ivanov Boris Georgievich - Samara State University of Architecture and Civil Engineering (SSUACE) Doctor of Technical Sciences, Associated Professor, +7 (846) 242-17-84, Samara State University of Architecture and Civil Engineering (SSUACE), 194 Molodogvardeyskaya St., Samara, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Mikhasek Andrey Alexandrovich - Samara State University of Architecture and Civil Engineering (SSUACE) Candidate of Technical Sciences, Associated Professor, +7 (846) 242-17-84, Samara State University of Architecture and Civil Engineering (SSUACE), 194 Molodogvardeyskaya St., Samara, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 119 - 124

The problem of potential damage and destruction of constituent parts of hydraulic engineering structures, as well as deterioration of materials in the course of their continuous operation under the impact of natural and climatic factors is considered in the article. Practicability of development and implementation of the control system designated for the monitoring of the condition of hydraulic engineering structures and aimed at prevention of their destruction is under discussion. The authors insist that the safe operation of a hydraulic engineering structure, minimization of its maintenance costs and its negative impact on the environment depend on the step-by-step implementation of the aforementioned system.
Control over a hydraulic engineering facility should be based on advanced information systems capable of monitoring the structure condition in the non-stop mode. The systems should be efficient, reliable, cost-effective, computer-controlled, mobile and intelligent. Concepts of the two types of monitoring systems, an indicative and a representative one, are described in the article.

DOI: 10.22227/1997-0935.2012.7.119 - 124

References
  1. Bal’zannikov M.I. 50 let kafedre prirodookhrannogo i gidrotekhnicheskogo stroitel’stva Samarskoy gosudarstvennoy arkhitekturno-stroitel’noy akademii [50th Anniversary of Department of Environmental Protection and Hydraulic Engineering, Samara State Academy of Architecture and Civil Engineering]. Gidrotekhnicheskoe stroitelstvo [Hydraulic Engineering]. 2003, no. 2, pp. 55—57.
  2. Shabanov V.A., Osipov S.V., Bal’zannikov M.I. Puti povysheniya effektivnosti i nadezhnosti gravitacionnykh plotin iz malocementnogo betona [Methods of Improving the Efficiency and Reliability of Gravity Dams Made of Low Cement Concrete]. Gidrotekhnicheskoe stroitelstvo [Hydraulic Engineering]. 2001, no. 12, pp. 2—7.
  3. Bal’zannikov M.I., Rodionov M.V., Seliverstov V.A. Povyshenie ekologicheskoy bezopasnosti ekspluatiruemykh gruntovykh gidrotekhnicheskikh sooruzhenii [Improvement of Environmental Safety of Earth Hydraulic Structures in Operation]. Vestnik SGASU. Gradostroitelstvo i arkhitektura [Proceedings of SGASU. Urban Construction and Architecture]. 2011, no. 1, pp. 100—105.
  4. Bal’zannikov M.I., Lukenyuk E.V., Lukenyuk A.I. Ekologicheskaya sistema sbora informatsii o sostoyanii regiona [Ecological System of Collection of Data concerning the Condition of the Region]. RF Patent 70026. 2008, Bulletin no. 1.

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SCENARIO OF AN ACCIDENT OF SOIL DAMS IN CASE OF WATER SPILL OVER A DAM CREST BY USING FAULT TREE ANALYSIS

Vestnik MGSU 4/2016
  • Kuznetsov Dmitriy Viktorovich - JSC Energy Constructing Complex EES (ESCO UES) engineer, chief specialist, Department of Project Management “South”, JSC Energy Constructing Complex EES (ESCO UES), 51 Arkhitektora Vlasova str., Moscow, 117393, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 94-107

The scenario of a hydrodynamic accident of water flow over a crest of a soil dam is considered by the method of fault tree analysis, for which the basic reasons and controlled diagnostic indicators of an accident have been defined. Logical operators “AND”/”OR” were used for creation of a sequence of logically connected events, leading to an undesired event in the scenario of accident. The scenario of the accident was plotted in case of three basic reasons - an excessive settling of a dam crest, an excess flood, an inoperable spillway, taking into account the sequence of the events’ development and with observance of the necessary conditions leading to an accident. “Technical” reasons were observed in the present scenario, force majeure events were not considered. The provided scenario of the accident consists of two branches of events’ development: the left one that depends on an upstream level, and the right one that depends on settling of a dam crest. In each of the considered events an accident “the water spill over a crest of a soil dam” is possible only in case of execution of two different conditions at the same time, i.e. in case of an appropriate upstream level and the appropriate mark of a crest of a soil dam. The conditions of the accident are defined by diagnostic indices - the upstream level and settling of a dam crest, which at the same time are safety criteria of the hydraulic structure for soil dams. They allow defining the technical condition of the construction. Four possible technical conditions are suggested for the definition of technical statuses - normative, operable, limited operable, abnormal. Criteria of safety are the boundaries of the state: for loading and impact - it is the upstream level, for geometrical compliance of the construction - it is a dam crest mark.

DOI: 10.22227/1997-0935.2016.4.94-107

References
  1. O bezopasnosti gidrotekhnicheskikh sooruzheniy : Federal’nyy zakon RF № 117-FZ ot 21 iyulya 1997 g. [Federal Law of the Russian Federation no. 117-FZ from July 21, 1997 “On Safety of Hydraulic Structures”]. (In Russian)
  2. Ob utverzhdenii Dopolnitel’nykh trebovaniy k soderzhaniyu deklaratsii bezopasnosti gidrotekhnicheskikh sooruzheniy na ob”ektakh energetiki : Prikaz Federal’noy sluzhby po ekologicheskomu, tekhnologicheskomu i atomnomu nadzoru № 1163 ot 29 dekabrya 2006 g.[The Order of the Federal Environmental, Technological and Nuclear Supervision Service of Russia, dated 29.12.2006 no. 1163 “On the Approval of Additional Requirements to the Contents of the Declaration of Safety of Hydraulic Structures on Power Engineering Facilities”]. (In Russian)
  3. Dopolnitel’nye trebovaniya k soderzhaniyu deklaratsii bezopasnosti i metodika ee sostavleniya, uchityvayushchie osobennosti deklarirovaniya bezopasnosti gidrotekhnicheskikh sooruzheniy ob”ektov energetiki : RD-12-03-2006 [RD-12-03-2006 Additional Requirements to the Content of the Declaration of Safety and a Technique of Its Drawing Up Considering the Features of Declaring Safety of the Hydraulic Structures of Power Engineering Facilities]. (In Russian)
  4. Henley E.J., Kumamoto H. Reliability Engineering and Risk Assessment. Prentice Hall, June 1980, 568 p.
  5. Dhillon B.S., Singh Chanan. Engineering Reliability. New Techniques and Applications. Publication John Willey & Sons, New York, 1981, 362 p.
  6. Bellendir E.N., Ivashintsov D.A., Stefanishin D.V., Finagenov O.M., Shul’man S.G. Veroyatnostnye metody otsenki nadezhnosti gruntovykh gidrotekhnicheskikh sooruzheniy [Probabilistic Assessment Methods of the Reliability of Soil Hydraulic Engineering Constructions]. Saint Petersburg, VNIIG Publ., 2004, 532 p. (In Russian)
  7. Metodika opredeleniya razmera vreda, kotoryy mozhet byt’ prichinen zhizni, zdorov’yu fizicheskikh lits, imushchestvu fizicheskikh i yuridicheskikh lits v rezul’tate avariy gidrotekhnicheskikh sooruzheniy predpriyatiy toplivno-energeticheskogo kompleksa : utverzhdena prikazom MChS RF i Minenergo RF № 776/508 ot 29 dekabrya 2003 g. [Technique of Determining the Extent of Harm, Which Can Be Caused to Life, Health of Natural Persons, Property of Natural and Legal Individuals as a Result of Failures of Hydraulic Engineering Constructions of the Enterprises of Fuel And Energy Complex : approved by the Order of EMERCOM of Russia and the RF Ministry of Energy no. 776/508 from 29 December 2003]. (In Russian)
  8. Ivashchenko I.N., Radkevich D.B., Ivashchenko K.I. Veroyatnostnaya otsenka riska avariy plotin po rezul’tatam ikh monitoringa i obsledovaniy [Probabilistic Assessment of the Risk of Accidents of Dams by Results of Their Monitoring and Inspections.] Gidrotekhnicheskoe stroitel’stvo [Hydrotechnical Construction]. 2012, no. 7, pp. 22—28. (In Russian)
  9. ICOLD Bulletin No. 130. Risk Analysis for Dam Safety. Guidelines and Management. ICOLD Publ., Paris, France, 162 p.
  10. Hardrow J., editor. Risk and Uncertainties in Dam Safety. CEA Group Co. Canada, 2005, 580 p.
  11. P-842-86 (Gidroproekt). Rekomendatsii po otsenke nadezhnosti gidrotekhnicheskikh sooruzheniy [Recommendations for the Assessment of Reliability of Hydraulic Engineering Constructions. P-842-86 (Gidroproekt)]. Moscow, Gidroproekt Publ., 1986. (In Russian)
  12. Elokhin A.N. Analiz i upravlenie riskom: teoriya i praktika [Analysis and Management of Risk: Theory and Practice]. Moscow, Strakhovaya gruppa «Lukoyl», 2000, 185 p. (In Russian)
  13. Ostreykovskiy V.A., Shvyryaev Yu.V. Bezopasnost’ atomnykh stantsiy. Veroyatnostnyy analiz [Safety of Nuclear Power Plants. Probabilistic Analysis]. Moscow, Fizmatlit Publ., 2008, 349 p. (In Russian)
  14. Veksler A.B., Ivashintsov D.A., Stefanishin D.V. Nadezhnost’, sotsial’naya i ekologicheskaya bezopasnost’ gidrotekhnicheskikh ob”ektov: otsenka riska i prinyatie resheniy [Reliability, Social and Environmental Safety of Hydraulic Structures: Risk Assessment and Decision Making]. Saint Petersburg, VNIIG im. B.E. Vedeneeva Publ., 2002, 591 p. (In Russian)
  15. Malakhanov V.V. Tekhnicheskaya diagnostika gruntovykh plotin [Technical Diagnosis of Soil Dams]. Moscow, Energoatom-izdat Publ., 1990, 121 p. (BGG. B-ka gidrotekhnika i gidroenergetika [Library of Hydrotechnical and Hydroenergy Worker]; no. 97). (In Russian)
  16. Guzenkov S.N., Stefanishin D.V. Finagenov O.M., Shul’man S.G. Nadezhnost’ khvostovykh khozyaystv obogatitel’nykh fabric [Reliability of Tail Facilities of Concentrating Factories]. Belgorod, Vezelitsa Publ., 2007, 674 p. (In Russian)
  17. Malik L.K. Chrezvychaynye situatsii, svyazannye s gidrotekhnicheskim stroitel’stvom (retrospektivnyy obzor) [The Emergency Situations Connected to Hydrotechnical Construction (the Retrospective Review)]. Gidrotekhnicheskoe stroitel’stvo [Hydrotechnical Construction]. 2009, no. 12, pp. 2—16. (In Russian)
  18. Bobkov S.F., Boyarskiy V.M., Veksler A.B., Shvaynshteyn A.M. Osnovnye faktory ucheta propusknoy sposobnosti gidrouzlov pri deklarirovanii ikh bezopasnosti [Basic Factors of the Accounting for Throughput of Water-Engineering Systems When Declaring Their Safety]. Gidrotekhnicheskoe stroitel’stvo [Hydrotechnical Construction]. 1999, no. 4. (In Russian)
  19. Vasilevskiy A.G., Shtil’man V.B., Shul’man S.G. Metody otsenki nadezhnosti zatvorov gidrotekhnicheskikh sooruzheniy (sistemnyy analiz) [Methods for Assessing the Reliability of the Gates of Hydraulic Structures (Systems Analysis)]. Saint Petersburg, OAO «VNIIG im. B.E. Vedeneeva» Publ., 2010. (In Russian)
  20. Kalustyan E.S. Uroki avariy Kiselevskoy i Tirlyanskoy plotin [Lessons of the Accidents of Kiselevsk and Tirlyansky Dams]. Gidrotekhnicheskoe stroitel’stvo [Hydrotechnical Construction]. 1999, no. 4, pp. 48—50. (In Russian)
  21. Malakhanov V.V., Tolstikov V.V., Kuznetsov D.V. Informatsionno-diagnosticheskaya programma «Shershnevskiy gidrouzel» [Information and Diagnostic Program “Shershnevskiy Water-Engineering System”]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2006, no. 2, pp. 97—111. (In Russian)
  22. Bellendir E.N., Nikitina N.Ya., editors. STP VNIIG 210.02.NT-04. Metodicheskie ukazaniya po provedeniyu analiza riska avariy gidrotekhnicheskikh sooruzheniy [STP VNIIG 210.02.NT-04. Methodical Instructions for Risk Analysis of Accidents of Hydraulic Structures]. 2nd edition. Saint Petersburg, OAO «VNIIG im. B.E. Vedeneeva» Publ., 2005, 99 p. (In Russian)
  23. Shkol'nikov S.Ya. O trebovaniyakh k vyboru stsenariev avariy gidrotekhnicheskikh sooruzheniy pri raschete vreda, kotoryy mozhet byt' prichinen fizicheskim i yuridicheskim litsam [On the Requirements to a Choice of Scenarios of Failures of Hydraulic Engineering Constructions in Case of Calculation of Harm Which Can Be Caused to Natural and Legal Individuals]. Gidrotekhnicheskoe stroitel’stvo [Hydrotechnical Construction]. 2014, no. 7, pp. 46—50. (In Russian)
  24. Stroitel’nye normy i pravila. Plotiny iz gruntovykh materialov : SNiP 2.06.05-84 : utverzhdeny Gosstroem SSSR 28.09.84 [Construction Rules and Regulations SNiP 2.06.05-84*Dams of Soil Materials. Approved by Gosstroy of USSR 28.09.84]. Moscow, Gosstroy SSSR Publ., 1991, 49 p. (In Russian)
  25. Malakhanov V.V., Kuznetsov D.V. Sovershenstvovanie monitoringa sostoyaniya i deklarirovaniya bezopasnosti gidrotekhnicheskikh sooruzheniy [Improvement of Monitoring of a State and Declaring of Safety of Hydraulic Structures]. Gidrotekhnicheskoe stroitel’stvo [Hydrotechnical Construction]. 2016, no. 1, pp. 41—53. (In Russian)
  26. SNiP 3.02.01-87. Zemlyanye sooruzheniya, osnovaniya i fundamenty [Construction Rules and Regulations SNiP 3.02.01-87. Soil Constructions, Bases and Foundations]. Moscow, VNIIG Publ., 1988, 128 p. (In Russian)
  27. Pravila bezopasnosti gidrotekhnicheskikh sooruzheniy nakopiteley zhidkikh promyshlennykh otkhodov : PB 03-438-02 [PB 03-438-02 Safety Rules for Hydraulic Structures of Liquid Industrial Wastes Reservoirs]. Moscow, ZAO NTTs PB Publ., 2010. (In Russian)

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Complex survey of the bridge over the structures of hydroelectric facility Ivankovo near Dubna(dam 21, power station 191)

Vestnik MGSU 11/2013
  • Mikhaylova Larisa Ivanovna - Moscow State University of Civil Engineering (MGSU) Leading engineer, laboratory of Inspection and Reconstruction of Buildings and Structures, Department of Testing of Structures, 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 .
  • Kunin Yuriy Saulovich - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Professor, Chair, Department of Testing of Structures; +7 (495) 287-49-14, ext. 1331, 1150., 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 .
  • Kotov Vyacheslav Ivanovich - Moscow State University of Civil Engineering (MGSU) Director, Laboratory of Examination and Testing of Structures at Department of Testing of Structures; +7 (495) 287-49-14, ext. 1331, 1150., 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 123-131

The article describes the results of a comprehensive survey of the bridge structure in Dubna. The survey was performed to determine the load capacity and maintainability of the bridge structures for the period prior to the repair, as well as to collect the information necessary to update the draft decision and the right strategy of major repairs. The growing needs of the city Dubna, which several times increased the operational loading of the bridge structures, and no major repairs since the construction, led to the need of restricting the traffic capacity of the only transportation artery. By the time of the survey in November 2011, contraflow over the bridge and the restricted traffic of more than 8 t was organized, which resulted in tense atmosphere in the city.The authors studied the historical data and design features of the supporting structures of the bridge. Particular attention was paid to the state of load-bearing structures of the bridge and their deformability. The strength characteristics were studied. The authors analyzed the results of calculations in order to determine the carrying capacity of the bridge structures with the test loads. It turned out that the carrying capacity of the bridge is sufficient for load accommodation. However, in accordance with the regulations, the bridge does not meet modern requirements for the travel width. It was recommended to maintain contraflow and to provide operational loads of the class H-10 (i.e. platoons with GVW of 10 t and the presence of a single vehicle in a platoon with GVW of 13 t) until the major repairs. After major repairs with restoration of bearings, waterproofing, water disposal system, replacing the bed, repair of the protective layer, it will be possible for single vehicles weighing up to 25 t to pass over the bridge.

DOI: 10.22227/1997-0935.2013.11.123-131

References
  1. Istoriya i issledovaniya [History and Investigations]. Moskva — Volga [Moscow — Volga river]. Available at: http://moskva-volga.ru. Date of access: 29.04.2013.
  2. Mitropol'skiy N.M. Metodologiya proektirovaniya mostov [The Methodology of Designing Bridges]. Moscow, 1958, 292 p.
  3. Kunin Yu.S., Kotov V.I., Mikhaylova L.I. Obsledovanie avtodorozhnogo mosta cherez plotinu ¹ 21 i Ivan'kovskuyu GES ¹191 po adresu Moskovskaya oblast', g. Dubna: nauchno-tekhnicheskoe zaklyuchenie [Complex Survey of the Road Bridge over the Dam ¹ 21 and Hydropower Unit of Ivankovo at Address Moscow Region, Dubna city: Scientific and Technological Opinions]. Moscow, 2011, p. 7.
  4. Bryus L. (Frantsiya) Treshchinoobrazovanie v zhelezobetonnykh konstruktsiyakh [Cracking in Reinforced Concrete Structures]. Materialy mezhdunarodnogo soveshchaniya po raschetu stroitel'nykh konstruktsiy [Works of International Conference on Calculating Building Structures]. Moscow, Gosstoyizdat Publ., 1961, p. 53.
  5. Fizdel' I.A. Defekty v konstruktsiyakh, sooruzheniyakh i metody ikh ustraneniya [Defects in Constructions, Structures and Methods of their Correction]. Moscow, Stroyizdat Publ., 1987, 196 p.
  6. Sakhnovskiy K.V. Zhelezobetonnye konstruktsii [Reinforced Concrete Structures]. Moscow, 1951, 839 p.
  7. Evgrafov K.G. Primenenie metoda rascheta konstruktsiy mostov po predel'nym sostoyaniyam [Application of the Method of Limit States in Bridge Design]. Materialy mezhdunarodnogo soveshchaniya po raschetu stroitel'nykh konstruktsiy [Works of the International Conference on Building Structures Calculation]. Moscow, Gosstoyizdat Publ., 1961, p. 153.
  8. Vasil'ev B.F., Bogatkin I.L., Zalesov A.S., Pan'shin L.L. Raschet zhelezobetonnykh konstruktsiy po prochnosti, deformatsiyam, obrazovaniyu i raskrytiyu treshchin [Calculation of Reinforced Concrete Structures in Respect of their Strength, Deformation and Crack Formation]. Moscow, Izdatelstvo Literatury po Stroitel'stvu Publ., 1965, 416 p.
  9. Grassniñk A., Gr?n E., Fiks V., Holzapfel V., Roter H. Preduprezhdenie defektov v stroitel'stve. Zashchita materialov i konstruktsiy [Prevention of Defects in Construction. Protection of Materials and Structures]. Moscow, Stroyizdat Publ., 1989, 216 p.
  10. Vasil'ev A.P., Balovnev V.I., Korsunskiy M.B. and others, editor Vasil'eva A.P. Remont i soderzhanie avtomobil'nykh dorog: spravochnik inzhenera-dorozhnika [Repair and Maintenance of Roads: the Handbook of Highway Engineer]. Moscow, Transport Publ., 1989, 287 p.

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EFFECT OF RICE HUSK ASH ON THE PROPERTIES OF HYDROTECHNICAL CONCRETE

Vestnik MGSU 6/2018 Volume 13
  • Ngo Xuan Hung - Moscow State University of Civil Engineering (National Research University) (MGSU) Postgraduate Student, Department Technology of Binders and Concretes, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.
  • Tang Van Lam - Moscow State University of Civil Engineering (National Research University) (MGSU) Postgraduate Student, Department Technology of Binders and Concretes, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.
  • Bulgakov Boris Igorevich - Moscow State University of Civil Engineering (National Research University) (MGSU) Candidate of Technical Sciences, Associate Professor, Department of the Technology of Binders and Concretes, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.
  • Aleksandrova Ol’ga Vladimirovna - Moscow State University of Civil Engineering (National Research University) (MGSU) Candidate of Technical Sciences, Associate Professor, Department of the Technology of Binders and Concretes, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.
  • Larsen Oksana Alexandrovna - Moscow State University of Civil Engineering (National Research University) (MGSU) Candidate of Technical Sciences, Associate Professor, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.
  • Ha Hoa Ky - Moscow State University of Civil Engineering (National Research University) (MGSU) Student, Department of the Construction of Unique Buildings and Structures, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.
  • Melnikova Anastasiya Igorevna - Moscow State University of Civil Engineering (National Research University) (MGSU) Student, Institute of Construction and Architecture, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.

Pages 768-777

Subject: operation of concrete and reinforced concrete hydraulic structures on river systems and in the extended coastal zone of Vietnam takes place under the influence of aggressive environments, which significantly limits their service life. Therefore, the search for ways to solve the problem of increasing the durability and terms of maintenance-free operation of such facilities is very important. Previous studies have established the possibility of increasing the operational performance of hydraulic concrete (HC) by modifying their structure with complex additives that combine the water-reducing and densification effects. The possibility of increasing the quality of hydraulic concretes by using rice husk ash (RHA) as a finely dispersed mineral additive with high pozzolanic activity was also established. Research objectives: modification of the structure of hydraulic concrete; determination of the effect of an organo-mineral modifier consisting of RHA in combination with a superplasticizer on water resistance, chloride-ion permeability and strength of hydraulic concrete. Materials and methods: portland cement of type CEM II 42.5 N was used with the addition of rice husk ashes and a superplasticizer ACE 388 “Sure Tec” BASF. Quartz sand and limestone crushed stone were used as aggregates. Composition of the concrete mixture, compressive strength of concretes, water resistance and permeability of the concrete structure for chloride ions was calculated based on methods of Russian and international standards. Results: the use of an organo-mineral modifier consisting of a water-reducing superplasticizer ACE 388 and finely dispersed rice husk ash leads to a densification of the HC structure, which increases their water resistance and decreases the permeability for chloride ions. Conclusions: it was found that the introduction of the developed organo-mineral additive into the concrete mixture leads to densification of the concrete structure, contributes not only to the growth of compression strength at the age of 28 days by 32 % for HC-10, 23 % for HC-20 and 9 % for HC-30, but also to the increase of its water resistance by one or two marks. In addition, there is a significant decrease in the permeability for chloride ions of HC samples containing 10, 20 and 30 % RHA by mass of the binder, since the average value of electric charge that have passed through the samples made of HC-10, HC-20 and HC-30 were 305, 367.5 and 382.7 K respectively against 2562 K for control samples made of non-modified concrete without RHA. (The experimental results of measuring permeability for chloride ions were obtained according to standard ASTM C1202-12). Our study has confirmed the assumption that the introduction into the concrete mix of organo-mineral modifier consisting of a polycarboxylate superplasticiser and fine ash of rice husk, up to 90 % consisting of amorphous silica, will increase the density of hydraulic concrete structure, which will increase their strength, water resistance and reduce permeability for chloride ions.

DOI: 10.22227/1997-0935.2018.6.768-777

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