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Search Results: 1 - 10 of 418143 matches for " Klyuyev S.V. "
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High-strength fiber concrete for industrial and civil construction (rus)
Klyuyev S.V.
Magazine of Civil Engineering , 2012,
Abstract: The issue of using steelfiber for dispersed reinforce of fine-grained concrete is considered in the article. Research of steelfiber concrete patterns based on cement and compositional astringent material was held. The fine-grained cement and the binder with low water demand were used as the main binder. It is established that the application of composite binder and high density packing of the grains raises much the durability indicators. Algorithm and program for composition calculation of fine-grained steel fiber concrete based on technogenic sands enriched with Tavolzhan sands, that allow to get more compact packing of elongated pieces are developed. Optimal selection of filling material allowed to receive fiber concrete based on technogenic sand of Kursk Magnetic Anomaly with ultimate compressive strength equalled to 104,8 MPa, and with ultimate flexural strength 23,2 MPa for flexible structures.
External reinforcing of fiber concrete constructions by carbon fiber tapes
S.V. Klyuyev,Yu.V. Guryanov
Magazine of Civil Engineering , 2013,
Abstract: Strengthening the concrete and reinforced concrete structures with carbon fiber tapes is very actively applied in Europe nowadays. In Russia composites based on carbon fiber have also widely spread recently. The main advantages of these materials for strengthening structures are its high specific strength (strength-weight ratio) and strength-to-density ratio.Experimental studies on strengthening and restoration of the constructions were held. Flexible fiber concrete constructions based on man-made sand filler were used in the experiment. Corrugated steel fiber was used as the internal reinforcement. Composite based on carbon fiber was used as the external reinforcement. The technology of the external reinforcement is given. Recommendations for strengthening the flexible fiber concrete constructions are made in the article.
Fiber concrete containing composite binders and technogenic sands of Kursk magnetic anomaly for flexural structures
Lesovik R.V.,Klyuyev S.V.
Magazine of Civil Engineering , 2012,
Abstract: There are different methods for improving strength characteristics of concrete. One of them is fiber reinforcement of concrete with fibrils.This paper considers the application of steel fiber for the reinforcement of fine-grained concrete. The previous studies of this issue regarded mainly the cement and silica sand. In this project, the fine ground cement and the binder with low water demand were used as the main binder. The fiber-concrete mixture consisted mainly of the antropogenic sand of the Kursk magnetic anomaly, enriched with Tavolzhan sand.The studies have shown the evident advantage of a steel wave fiber in comparison to the anchor and flat milled fiber. The use of composite binders and high-density packing of the grains significantly increases the strength characteristics. With the rational selection of the filler, the steel-fiber concrete was procured on the antropogenic sand Kursk Magnetic Anomaly. Its compressive strength limit is 84.8 MPa and bending strength limit is 19.8 MPa for flexural structures.
Heavy loaded floors based on fine-grained fiber concrete
S.V. Klyuyev,A.V. Klyuyev,D.M. Sopin,A.V. Netrebenko
Magazine of Civil Engineering , 2013, DOI: 10.5862/mce.38.1
Abstract: Urgent problems of using needle fiber for fine-grained concrete disperse reinforcement are considered in the article. The fine cement and binder agent with low water requirements were used as an astringent. The main filling material of a fiber concrete mix was granite siftings. It is established, that application of the composite binder agent and high-density packaging of filling grains increases strength properties a lot. Optimal selection of filling material allowed to receive steel fiber concrete with ultimate compressive strength 118,8 MPa, and ultimate bending strength 14,1 MPa for heavily loaded floors of industrial buildings. It is established, that application of composite binder agent and high-density packaging of filling grains of concrete matrix can be effective in social, ecological and economic spheres. Incidentally, the economic effect of using new building materials will consist in consumption decrease of astringent for account of optimal conditions of steel fiber concrete structure formation.
The healing of damage after the plastic deformation of metals
S.V. Smirnov
Frattura ed Integrità Strutturale , 2013,
Abstract: The general regularities of damage healing during the annealing after cold deformation of metal materials are presented in this paper. In categories of damage mechanics the kinetic equations of damage healing during recovery and recrystallization are formulated. Diagrams of damage healing for some metal alloys are presented. The example of use of investigation results for optimization of industrial technology of pipes drawing is presented.
WEEVILS OF THE LARINUS GENERA OF ZAPORIZ`KA OBLAST (COLEOPTERA, CURCULIONIDAE)
Volovnik S.V.
Bìologì?nij Vìsnik Melìtopol?s?kogo Der?avnogo Pedagogì?nogo Universitetu ìmenì Bogdana Hmel?nic?kogo , 2011,
Abstract: Distribution and ecology of weevils of Larinus were investigated. In the vicinity of Zaporiz`ka oblast (Ukraine)some 9 species were found, namely Larinus adspersus, L. canescens, L. jaceae, L. minutus, L. obtusus, L. planus, L.sturnus, L. turbinatus, L. vulpes. Data on number, distribution, feeding, phenology, breeding, preimaginal developmentand parasites are given for each species. It is suggested that Larinus jaceae, L. оbtusus and L. sturnus could be used forweeds biological control.
Effect of annealing temperature on the value of contact resistance of ohmic contacts to InP
Novitskyi S.V.
Tekhnologiya i Konstruirovanie v Elektronnoi Apparature , 2012,
Abstract: It is experimentally confirmed that the temperature dependence of specific contact resistance of ohmic contacts Au—TiB2—Ge—Au—n—n+—n++-InP is described with the current transport model with a high density of dislocations in the contact region of the semiconductor. The samples used in the experiment were obtained at different annealing temperatures.
The estimation of enclosing structures edge zones influence on thermal performance and energy efficiency of buildings (rus)
Korniyenko S.V.
Magazine of Civil Engineering , 2011,
Abstract: One of priority directions in modern building is maintenance of energy efficiency of buildings and constructions. This problem can be realized by perfection of architectural, constructive and technical decisions. The particular interest is represented by an influence estimation of temperature and moisture mode of enclosing structures on a thermal performance and energy efficiency of buildings. The analysis of the data available in the literature has shown absence of effective calculation methods of temperature and moisture mode in edge zones of enclosing structures that complicates the decision of this problem.The purpose of the given work is an estimation of edge zones influence on a thermal performance and energy efficiency of buildings. The design procedure of energy parameters of a building for the heating period, realized in the computer program is developed. The given technique allows settling an invoice power inputs on heating, hot water supply, an electrical supply. Power inputs on heating include conduction heat-losses through an envelope of a building taking into account edge zones, ventilation heat-losses and leakage air (infiltration), internal household thermal emissions, heat-receipt from solar radiation. On an example it is shown that the account of edge zones raises conduction heat-losses through an envelope of a building on 37 %, the expense of thermal energy on building heating on 32 %, and the expense thermal and electric energy on 13 %. Consequently, thermal and moisture mode in edge zones of enclosing structures makes essential impact on building power consumption. Perfection of the constructive decision leads to decrease of transmission heat-losses through an envelope of a building on 29 %, the expense of thermal energy on building heating on 25 %, the expense of thermal and electric energy on 10 %. Thus, perfection of edge zones of enclosing structures has high potential of energy efficiency.
The complex assessment of a thermal performance of the building envelope
S.V. Kornienko
Magazine of Civil Engineering , 2012,
Abstract: The complex assessment of a thermal performance of the envelope on the basis of natural measurements and numerical modeling of the heat and moisture transport in building components was executed. On the basis of natural measurements it was shown that thermal performance qualities of a maintained building do not meet standard requirements. For the purpose of establishment of the reason of low level of a thermal performance numerical modeling of the heat and moisture transport in an external wall according to the computer program developed by the author, by two options — on the basis of the actual and design data was executed. It was shown that results of numerical modeling on the basis of actual data will well be coordinated with natural data that confirms reliability of the results received on the computer program. On the basis of numerical modeling with use of design data it was established that the design solution of external walls corresponded to standard requirements for a thermal performance, and, therefore, deterioration of a thermal performance can be caused by the violations allowed during construction and reconstruction of the building.
Heat recovery in air conditioning systems in frost-free season with using adiabatic cooling. Capacities overview
S.V. Chuduk
Magazine of Civil Engineering , 2011,
Abstract: In article the review of the information on possibilities of use of recuperators of heat is presented for the warm period of year for air-conditioning system. Aim of heat exchanger work in frost-free season is indirect cooling of incoming air before its input into maintainable premises. It is possible if exhaust air is cooled before its input into heat exchanger . In the article the operational principle of air conditioning system with using of adiabatic air cooling is considered. The data concerned system functioning depending on parameters of microclimate in maintainable premises are given.
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