75504 2712-8172 Magazine of Civil Engineering 3 29 2012 1-110
RAR RUS 12-18 57194623014 South Ural State University Baiburin Albert abayburin@mail.ru
76, Lenin prospekt, Chelyabinsk, Russia, 454080
 South Ural State University Pogorelov S. Study of concrete strength heterogeneity in monolithic structures The problem of the concrete strength heterogeneity in monolithic constructions is considered in this article. The factors, influencing on the heterogeneity are analyzed. The study results of the strength distribution over the area of the monolithic walls, floors and columns height are given. The features of the standard methods of the strength control are analyzed. The recommendations on the accounting of the established laws during the concrete strength control are given. 10.5862/MCE.29.1 concrete concrete heterogeneity monolithic structures concrete strength technological factors https://engstroy.spbstu.ru/article/2012.29.1/ 02.pdf
RAR RUS 19-28 Branch of RUE Institute BelNIIS – Scientific-technical Centre Derkach Valeriy v-derkatch@yandex.ru
267/2, Moskovskaya str., Brest, 224017 Belarus
 Tangential adhesion strength of cement mortars in masonry The initial shear strength (tangential adhesion) and the angle of internal friction in the horizontal plane of mortar joints are among important characteristics, determining the masonry strength and stiffness qualities in case of share. These characteristics influence largely over the limit state approach of buildings and facilities during seismic activity and over wind, crane and other load, causing the panel frame distortion in frame buildings with masonry infill. In the paper the experimental studies results of tangential adhesion strength of cement mortars with solid and hollow ceramic bricks, porous stones, calcium silicate bricks and cellular concrete blocks are presented. This research gives experimental dependences of mortar adhesive strength with mentioned types of masonry units on compressive strength of cement mortar. There is also the comparison of the obtained results with Russian and foreign standards in this paper. 10.5862/MCE.29.2 masonry masonry mortar shear adhesive strength frictional coefficient https://engstroy.spbstu.ru/article/2012.29.2/ 03.pdf
RAR RUS 29-34 Peter the Great Saint Petersburg Polytechnic University, PRDI “Venchur” Ulybin Alexey ulybin@mail.ru
Polytechnicheskay, 29
 Peter the Great Saint Petersburg Polytechnic University Zubkov Sergey svzubkov@mail.ru
Polytechnicheskay, 29
 Control methods for strength of ceramic bricks in the inspection of buildings The paper brings up the problem of finding the most accurate, reliable and, at the same time, less time-consuming and relatively inexpensive method of determining strength of ceramic bricks. This task is particularly important in the context of the lack of standards governing the use of nondestructive testing methods for ceramic bricks, and the difficulties associated with sampling of ceramic brick masonry for standard tests. In the paper the possibility of determining the compressive strength of corpulent ceramic bricks by testing cylindrical samples taken from the body of masonry, is explored. The relation between standard samples tests results according to GOST standards № 8265-84 and testing of cylindrical samples is given. The experimental results for influence of the direction of kern selection (horizontally and vertically in reference to flat of brick) on the strength is presented. The possibility of application of nondestructive testing methods for measuring strength of ceramic bricks is considered. Also the paper includes the examples of field and laboratory experiments. 10.5862/MCE.29.3 strength of bricks inspection of stone structures non-destructive testing https://engstroy.spbstu.ru/article/2012.29.3/ 04.pdf
RAR RUS 35-40 Khakass Technical Institute Selivanov Yu. Khakass Technical Institute Shiltsina A. Khakass Technical Institute Selivanov V. Khakass State University named after N.F. Katanov Loginova Yelena loginova_ev@list.ru Khakass State University named after N.F. Katanov Korolkova N. Composition and properties of ceramic heat insulating building materials made ofthe masses of low temperature foaming on the basis of clay raw material Ceramic heat-insulating building materials are the most promising for modern construction. Longlived, bio-resistant and corrosion-resistant, nonhygroscopic and noncombustible, they have the greatest stability of heat engineering properties through time. The combination of these properties is especially important in construction in seismic areas. The article contains the study results of compositions and properties of ceramic heat-insulting building materials of masses on the basis of clay raw materials, received by power efficient technology of low-temperature foaming. The work was conducted for the purpose of obtaining a porous structure of sufficient durability at the stage of the mass foaming at a temperature of 20-30 and achieving necessary durability without porous goods deformation at the stage of firing. The optimal composition of the masses was obtained by experiment in the course of the studies, also the technology, ensuring the fulfillment of assigned task was developed. The properties of developed masses compositions and porous ceramics of them provide the manufacturing of heat-insulting building materials in the form of single-piece goods by one-time firing. 10.5862/MCE.29.4 ceramic heat insulating building materials low temperature foaming porous structure phasemineral composition strength https://engstroy.spbstu.ru/article/2012.29.4/ 05.pdf
RAR RUS 41-47 Belgorod State Technological University named after V.G. Shukhov Lesovik R. Belgorod State Technological University named after V.G. Shukhov Klyuev Sergey Klyuyev@yandex.ru Fiber concrete containing composite binders and technogenic sands of Kursk magnetic anomaly for flexural structures 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. 10.5862/MCE.29.5 fine-grained concrete technogenic sand fiber concrete https://engstroy.spbstu.ru/article/2012.29.5/ 06.pdf
RAR RUS 48-53 N-6293-2016 57203965717 0000-0002-8715-1041 Samara State University of Economics Balzannikov Mikhail mibsgasu@mail.ru
Samara, Russia
 Samara State University of Architecture and Civil Engineering Mikhasek Andrey sgasu@sgasu.smr.ru Use of quick-setting substances in watertight elements for rock material dams The article deals with the application of rock material dams with watertight element in the form of a screen or core in hydraulic engineering construction. The authors developed a new technology of watertight element creation. The technology consists in quick-setting substance introduction into every deposited dam layer with the help of a special chute. Experimental model research on the form and size determination of the quick-hardening substance lamination area inside the dam was carried out. Further the article considered the comparative calculations of the quick-hardening substance volume required for forming screen or core impervious elements. The possibility of dam construction cost decrease according to the developed technology and the core IE implementation was shown. 10.5862/MCE.29.6 hydraulic engineering stone dam watertight element experimental model investigations https://engstroy.spbstu.ru/article/2012.29.6/ 07.pdf
RAR RUS 48-53 Group of companies «Sto Tretiy Trest» Petrakov Gennadiy p@103trest.ru The service life of plastic pipe in the polyurethane foam insulation, used for heating systems The interest in the polymer (plastic) pipes in terms of their use in district heating networks of large cities settlements and neighborhoods as flexible pre-insulated pipes in the polyurethane foam insulation channel free laying increased in Russia during the last decade. Pipes made of PE-RT (polyethylene of Raised Temperature Resistance) and PE-X (cross-linked polyethylene) are the most promising plastic pipes. Pipes made of PE-RT have long term hydrostatic resistance (ability to prevent the liquid expiration under pressure) at high temperatures, without molecular cross-linking. This resistance provides significant technological advantages (the ability to weld) comparing with the crosslinkable systems (PE-X), as well as pipes cost reduction. The paper presents the method of determining the service life of polymer heat pipelines made of PE-RT and PE-X at a temperature of 110 °C, based on domestic and foreign standards. The analysis of heat pipelines performance made of PE-RT and PE-X and the plastic pipes service life calculation at temperatures up to 110 °C indicate obvious advantages of PE-RT Type II DOWLEX ™ 2388. In addition, the article gives the guidance to developers of the standard GOST R 52134 next edition, based on European regulations and essential for the laying plastic pipe improvement. 10.5862/MCE.29.7 heating networks polymer pipes heat-resistant polyethylene crosslinked polyethylene long-term hydrostatic resistance service life https://engstroy.spbstu.ru/article/2012.29.7/ 08.pdf
RAR RUS 63-68 Dagestan state technical university Manturov Zagir Zagir9@mail.ru Determining the rational technological parameters of heatresistant concrete produced with sodium silicate binder Heat-resistant concrete is one of the most effective refractory materials. Using such concrete reduces the time of construction by 3-4 times, it decreases the labor costs during the construction of thermal units by 2-3 times, increases the working life of the thermal unit and, therefore, reduces the costs of maintenance and major repairs. This paper deals with heat-resistant concrete based on a sodium-silicate composite binder, regarded as an alternative to refractory concrete based on liquid glass. It brings the results of comprehensive research on the selection of rational technological modes of preparation, molding and thermal treatment of refractory concrete composite on sodium-silicate binder. In particular, the method of preparing the concrete mix is chosen. The author sets the method and mode of formation of products and determines the regime of concrete thermal treatment. These results were approbated in a plant of CJSC "Experimental Research and Production Enterprise". The approbation results showed the high techno-economic efficiency of the developed heatresistant concrete on composite sodium silicate binder. 10.5862/MCE.29.8 anhydrous sodium silicate composite sodium silicate binder heat-resistant concrete https://engstroy.spbstu.ru/article/2012.29.8/ 09.pdf
RAR RUS 69-73 15730895100 http://orcid.org/0000-0003-3251-3356 Saint Petersburg State University of Industrial Technologies and Design Gorshkov Alexander alsgor@yandex.ru
St. Petersburg, Russia
 M-6585-2013 6508103761 0000-0002-1196-8004 Peter the Great Saint Petersburg Polytechnic University Vatin Nikolai vatin@mail.ru
Polytechnicheskay, 29
 Peter the Great Saint Petersburg Polytechnic University Urustimov A. ksenbor@gmail.com
Polytechnicheskay, 29
 Military Space Academy named after A.F. Mozhaysky Rymkevich Pavel rymkewitch@yandex.ru Computational justification for engineering measures preventing the ice dams formation on the pitched roofs The following article deals with the problem of icicles formation on the roofs and the elimination methods. The attic roofs with pitched roofing are highly susceptible to this negative phenomenon. This research regards the generation of heat balance equation for cold attics. Using this equation, the engineering and technical substantiation for the list of measures preventing ice mounds formation in the roofs during the period with lowest outside temperature is made. With no ice mound the roofing remains perfectly safe after snow removal, its working lifespan extends and the leakages probability decreases. 10.5862/MCE.29.9 energy efficiency heat balance equation cold attic roof covering icicle https://engstroy.spbstu.ru/article/2012.29.9/ 10.pdf
RAR RUS 74-82 Peter the Great Saint Petersburg Polytechnic University Velichkin Viktor V.Velichkin2011@yandex.ru
Polytechnicheskay, 29
 Peter the Great St. Petersburg Polytechnic University Soldatenko Tamara soldatenko_tn@bk.ru
29 Politechnicheskaya St., St. Petersburg, 195251, Russia
 The model of intellectual support of decision-making in building structures condition management Popular methods of decision-making in building structures condition management do not fully consider peculiarities of their up-to-date operation. These approaches do not take into account the kinds of uncertainty occurring at a building designing stage and taking place while monitoring. It leads to the decrease in building targeted application efficiency and increase of controlling organization costs. The following approach suggests the improvement in the decision-making support systems by integration of expert knowledge and experience with tool and visual building structure control results. The purpose of the paper is effective decision-making aimed at uncertainty level decrease in the process of detection of operational impacts on building structures for the required durability provision. This purpose is achieved by artificial intelligence element application (fuzzy sets) in the joint analysis of retrospective, current and expert information on the building structure state. The authors suggest selecting building structure state controlling actions with the help of fuzzy conclusions obtained by the usage of designed algorithms and calculated procedures. The applicability of the given approach was proved by the calculated example. A grounded variant of decision on the building structure state intellectual control was submitted (a damaged building wall). On the basis of these results the conclusions on the application field and conditions of the designed algorithms and model were made. 10.5862/MCE.29.10 building structure state membership function fuzzy logic decision-making intellectual support https://engstroy.spbstu.ru/article/2012.29.10/ 11.pdf
RAR RUS 83-88 Voronezh State University of Architecture and Civil Engineering Eremin V. Voronezh State University of Architecture and Civil Engineering Lam Cao Van caolamx3@gmail.ru Automating the evaluation of riding quality of bridges One of the main bridgework characteristics is the riding quality of bridge floor, determining traffic mode and conditions. The riding quality is estimated according to part wear of particular floor. The article describes the results of optimization work on wear determination and traffic condition estimation process. For this purpose the automated program was created which was aimed at labor coefficient reduction and lessening the qualification and subjective opinion impact of the expert, involved in the bridgework examination. On the basis of particular floor part wear one can also determine the main transport service bridgework indices: safe traffic speed, dynamic coefficient and traffic condition category. The riding quality estimation program enables to establish the kinds of maintenance required in the nearest future. 10.5862/MCE.29.11 automation tear and wear evaluation of wear condition of motion bridge floor maintenance riding quality https://engstroy.spbstu.ru/article/2012.29.11/ 12.pdf