Abstract:In the sphere of road activities computer vision technologies are successfully used to solve various problems: when diagnosing roads, in the operation of complexes of photo and video recording of traffic offences, as well as when counting traffic or pedestrian flows volumes. The article describes possible approaches to addressing some of the listed typical problems using free software. The list of terms and definitions that are established in the professional community is considered.
Abstract:The article presents the comparative tests results of mobile laser scanning systems and mobile road laboratories. The main tasks of these tests were to assess the accuracy of determining the spatial position of objects both on a cloud of laser scanning points and on photo and video images recorded respectively by mobile laser scanning systems and mobile road laboratories, as well as to evaluate the accuracy of determining road geometric parameters and road pavement longitudinal profile.
Keywords:roads, mobile laser scanning, diagnostics, road laboratory, spatial data, digital model.
USE OF DEFLECTOMETER INDICATORS FOR ASSESSING NON-RIGID PAVEMENTS STRENGTH
Doctor of Engineering, Professor O.A. Krasikov
(FAI «ROSDORNII»)
Ph. D. (Tech.), Professor I.N. Kosenko
(KazADI, Alma-Ata)
Contact information: krasikov@rosdornii.ru
Abstract:The methodological provisions for processing the data obtained by deflectometer when assessing non-rigid pavements strength are presented. It is emphasized the need to calculate the actual modulus of elasticity to assess the pavement strength according to deflectometer data. The appropriate formulas are done. Four types of strength factors used at the design stage of non-rigid pavements, at the construction stage and during the warranty period, at the operation stage and with limited background information are considered.
Keywords:deflectometer, strength assessment, non-rigid pavements, modulus of elasticity, four types of strength factors.
ABOUT THE BEHAVIOR OF STEEL PILES IN INTEGRAL ABUTMENT OF BRIDGES
Ph. D. (Tech.) V.I. Popov
(Moscow Automobile and Road Construction State Technical University (MADI))
Contact information: +7 (925) 010-10-97; vpopov@stpr.ru
Abstract:The issues related to the behavior of steel piles in integral abutment of bridges under cyclical temperature effects in soil embankments and EPSblock embankments are considered. It is shown that steel piles of tubular section provide the structure operation without fatigue damage during the service life. The improvement of steel piles in integral abutments is provided by local strengthening at the point of their connection with abutment body. It is also revealed that the use of the EPS-block in the embankment approach allows to reduce the lateral pressure on the piles, as well as decrease the displacements and bending moments in their sections
Keywords:bridge, integral abutment, temperature gradient, soil pressure, expanded polystyrene (EPS), displacement, bending moments.
Doctor of Engineering, Professor A.V. Korgin,
Engineer V.A. Romanets,
Scientific Researcher V.A. Ermakov,
Scientific Researcher L.Z. Zeyd-Kilani
(Moscow State University of
Civil Engineering (NRU MGSU))
Contact information: Korguine@mgsu.ru; RomanetsVA@mgsu.ru; Ermakov@mgsu.ru; ZeydkilaniLZ@mgsu.ru
Abstract:This article considers the issues concerning full-scale static and fatigue testing of a full-sized model of the pedestrian bridge made of aluminum alloy 1915T when developing the Set of Rules for the design of bridges made of aluminum alloys. During the research work through modeling and hand calculation the location of the most loaded structural elements and the maximum number of cycles for crack initiation in the bridge joint have been determined. The model, loading schemes, and measuring equipment installation locations are described. The article also presents the previously obtained results of samples testing for tension and fatigue, which are necessary for accurate modeling of the structure and predicting the crack initiation and growth. The convergence in the results of theoretical and experimental researches has been assessed.
INCREASING RELIABILITY OF EXPANSION JOINTS OF BRIDGE STRUCTURES
Deputy Technical Director for New Technologies, External Ph. D. student A. M. Isakov
(«BITUM» LLC),
Ph. D. (Chem.) D.Y. Nebratenko
(FAI «ROSDORNII»)
Contact information: nebratenko@rosdornii.ru
Abstract:The article discusses the way to increase the reliability of expansion joints of bridge structures. The approaches to the formation of adhesive compounds are described and the peculiarities of their work are considered.
METHOD FOR INCREASING THE DURABILITY OF BRIDGE REINFORCED CONCRETE STRUCTURES DUE TO THE USE OF CONCRETES RESISTANT TO CARBONIZATION
Doctor of Engineering, Professor V.K. Kozlova, Ph. D. (Tech.) A.V. Wolf
(Polzunov Altai State Technical University), Engineer V.O. Motuz,
Engineer E.V. Stroganov,
Engineer A.V. Kastyurin
(KGKU «Altayavtodor»)
Contact information: volf.anna@mail.ru
Abstract:The article deals with the results of the research by differential thermal and thermogravimetric analysis methods. The data obtained indicate the considerable proportions of carbon dioxide corrosion of cement stone during the service of concrete structures. It is shown that the process of carbonization of cement stone and concrete is accompanied by shrinkage deformations. The carbonization shrinkage of cement stone is 2.5 mm/m. The introduction of mineral and chemical additives into Portland cement composition results in a significant decrease in the carbonization shrinkage of cement stone to 0.5 mm/m and a reduction in the total shrinkage deformation to 0.65 mm/m. The introduction of complex carbonate-containing additives in the amount of 50-80 kg/m3 instead of part of the sand helps to reduce the shrinkage deformation of concrete: moisture shrinkage is 0.15 mm/m, carbonization shrinkage is 0.32 mm/m.
Doctor of Engineering V.D. Kondratev
(Moscow Automobile and Road Construction
State Technical University (MADI))
Contact information: k-051310@mail.ru
Abstract:The article deals with the development of work aimed at improving road traffic safety in the world and in the Russian Federation. The UN and WHO active role is noted. It is emphasized that during 2011-2020 in the world the activities were carried out on the basis of the Decade of Action for Road Safety proclaimed by the United Nations General Assembly. The goal of reducing road traffic deaths by 2030 is noted. The road safety situation in Russia is assessed
Keywords:road traffic safety, Decade of Action for Road Safety, road traffic accident, Global Ministerial Conferences on Road Safety, risk factors.
RESULTS OF ASSESSMENT OF THE EFFECTIVENESS OF MEASURES TO IMPROVE ROAD TRAFFIC SAFETY USING THE BENEFITS AND COSTS METHOD
Ph. D. (Tech.) A.L. Rybin
(FAI «ROSDORNII»),
Doctor of Engineering, Professor V.A. Kretov
(Russian University of Transport (RUT MIIT))
Contact information: Rybin@rosdornii.ru
Abstract:The article deals with the data on estimation of efficiency of measures to improve road traffic safety, received by the benefits and costs method.
THE INFLUENCE OF VISIBILITY CONDITIONS ON ROAD SAFETY WHEN PERFORMING TRAFFIC LIGHT REGULATION
Ph. D. (Tech.) S.V. Vitolin
(Volgograd State Technical University)
Contact information: +7 (904) 776-54-23; vitolinsv@mail.ru
Abstract:The article concerns a research that purpose was to develop the recommendations for improving road safety at regulated intersections by improving visibility conditions. The research included a systematic analysis of Russian and foreign experience in assessing and improving visibility conditions at regulated intersections, along with identifying the relationship between accidents and road transport conditions. As the research results, the classification of factors that affect visibility at a regulated intersection, as well as the recommendations for improving visibility conditions are given.
Keywords:road safety, street and road network, accident rate, regulated intersection, visibility.
PREPARATION OF ASPHALT GRANULATE FOR USE IN THE ASPHALT CONCRETE MIXTURES
Doctor of Engineering, Professor A.P. Lupanov,
Ph. D. (Tech.), Professor V.V. Silkin
(Moscow State Automobile and Road
Technical University (MADI)),
Ph. D. (Tech.) A.S. Suhanov,
Engineer A.V. Silkin
(AO «Asphalt Plant Kapotnya»),
Engineer D.Yu. Karelin
(LLC «Wirtgen-International-Service»)
Contact information: alesilkin@yandex.ru
Abstract:The article deals with the preparation of asphalt granulate for effective use when preparing asphalt concrete mixtures at the asphalt plant. The results of research on the choice of crushing methods for asphalt granulate taking into account the specific properties of this material are presented. Practical measures to improve the efficiency of using granulate at the plant by reducing moisture content during storage are proposed.
Abstract:At the beginning of the century, new requirements have been raised for perpetual road pavements according to modern concepts of the USA and the EU. The article considers the basic experimental and practical studies of “self-healing road concretes”, which were first developed in Kazakhstan and meet these requirements. The durability of road concretes is justified by the results of physico-chemical studies of the structure of belite cement stone and physico-mechanical tests of various compositions of concretes and core samples from roads. The strength of concrete continues to increase for over 40 years. It is assumed that the way to durable “Roman concretes” has been found.
Keywords:durability, road concretes, physical and chemical studies, cement stone, structure, physical and mechanical tests, strength.
EXPERIENCE OF JOINT USE OF SILICA AND LATEX IN CONCRETE TECHNOLOGIES
Doctoral student K.N. Putsenko
(Irkutsk National Research Technical University)
Contact information: Putsenko_kseniya@mail.ru;
8(904)131-56-13
Abstract:Currently, one of the most promising directions in the development of new types of concrete is the joint use of by-products of industrial production and latex. The objectives of the article are to analyze the experience of using silica and latex in concrete construction and present the results of research work on the development of fine-grained concrete modified with an ultradispersed additive – silica and latex.
RELATIONSHIP OF LINEARITY LIMIT STRESS OF ASPHALT CONCRETE WITH LIMIT SHEAR STRESS OF BITUMEN
Doctor of Engineering V. A. Zolotarev (Kharkiv National Automobile and Highway University)
Contact information: kafedradsm@gmail.com
Abstract:The rheological behavior of asphalt concrete is largely due to the temperature-time characteristics of the bituminous binder behavior. Depending on the loading level, asphalt concrete deforms as linear or non-linear viscoelastic bodies. The transition to nonlinear deformation is evaluated by the limit strains and stresses, above which the directly proportional relationship between them is disturbed. The article shows that linearity limit stresses are much more sensitive to deformation than linearity limite strains.
In accordance with this, to assess the effect of bituminous binders on the transition of asphalt concrete to nonlinear deformation, the limit shear stresses of bitumen, corresponding to their exit to a stationary flow, or their cohesion, are taken. The straight-line relationship between linearity limit stresses of asphalt concrete and limit shear stresses of bituminous binders is shown.
COMPREHENSIVE APPROACHES TO OPTIMIZING THE CONCRETE MIX COMPOSITIONS FOR HEAVY CONCRETE
Ph. D. (Physics and Mathematics) R.O. Rezaev (The Leibniz Institute for Solid State and Materials Research, Dresden),
Engineer A.A. Dmitriev
(LLC «Innovacionnye kompozitnye materialy»), Engineer N.A. Borodulya
(Tomsk Polytechnic University),
Engineer I.V. Stepanuga
(LLC «Poliplast Novomoskovsk»),
Ph. D. (Tech.) B.P. Kutko
(FAI «ROSDORNII»)
Contact information: kutko@rosdornii.ru
Abstract:The paper deals with a method for complex optimization of the concrete composition based on the linear theory of packing density, coating thickness, and procedure for visualizing the rheological properties of concrete mixtures and concrete strength depending on the components consumption. The concept includes economic indicators. The calculation base of the method has been tested both on previously known experimental results and on the author's results. The scope of the complex optimization method covers both rigid and easily workable concrete mixes with arbitrary granulometry and different amount of aggregates. The key optimization parameters, such as water-cement ratio, aggregates ratio, air entrainment, etc., have a clear technological meaning.