scholarly journals ANALYSIS OF THE MECHANISM OF REINFORCEMENT OF THE ROAD STRUCTURE WITH A UNLOADING SECTION

2021 ◽  
Vol 1 (48) ◽  
pp. 382-391
Author(s):  
Shevchuk L ◽  
Keyword(s):  
Finite Element ◽  
Asphalt Concrete ◽  
Low Temperatures ◽  
Infinite Length ◽  
Elastic State ◽  
Transverse Cracks ◽  
Road Asphalt ◽  
The Road ◽  
Elastic Module ◽  
Concrete Coating

The problem posed is about the mechanism for reinforcing the road structure with a slab with an unloading cut. The reasons for the appearance of transverse cracks in the upper layer of the road surface in winter have been investigated. Solvable equations are formulated, their finite element analogs are constructed. Cases of loads at different values of elastic module and plate sizes are considered. At low temperatures, the upper layers of the road try to reduce their length, however, due to their almost infinite length, they cannot do this and transverse disordered cracks appear in the upper layer, which, due to the action of transport loads and the forces of frozen water, lead to further delamination and destruction of the road structure. Therefore, the introduction into another layer of a reinforced slab made of a stiffer and more durable material that is capable of absorbing increased stresses allows the upper layer to shorten and lengthen freely and removes the arising longitudinal thermal stress. Due to the fact that this plate is located in the zone of stress concentration, these stresses become less dangerous. KEYWORDS: AUTOMOBILE ROAD, ASPHALT-CONCRETE COATING, LOADING RISK, TRACKED TRACKS, TRANSPORT LOADS, STRESS FIELD, THERMO ELASTIC STATE

scholarly journals ANALYSIS OF PREDICTION METHODS FOR THE FUNCTIONAL DURABILITY OF ROAD MARKINGS

2018 ◽  
Vol 15 (4) ◽  
pp. 574-587 ◽  
Author(s):  
V. V. Golubenko ◽  
A. A. Aleksandrov ◽  
V. V. Sirotyuk
Keyword(s):  
Asphalt Concrete ◽  
Technological Properties ◽  
The Road ◽  
Road Pavement ◽  
Forecasting Methods ◽  
Stone Materials ◽  
Different Types ◽  
Concrete Coating ◽  
Main Factors ◽  
Road Marking

Introduction. The actuality of the research is emphasized in the Strategy of proclaiming the desire for zero mortality on the country’s roads. Increasing the functional durability (the service life period) of horizontal road markings is an effective and cheap way to organize the movement of vehicles and pedestrians, which could reduce the number of accidents by 15-30%.Methods. The detailed factor analysis, influenced on the functional durability of the horizontal road markings and on the durability forecasting methods, is made by the authors.Results. The authors have established the main factors determining the functional durability of the horizontal road marking. They are divided into five groups: weather-climatic; mechanical; properties of the marking material; technological; properties of the road pavement. Moreover, the article presents a critical analysis of the existing methods of forecasting the functional durability of horizontal marking. In foreign publications on the issue under consideration there is no work on the prediction of the functional durability of horizontal marking by creating complex mathematical models. Most foreign and Russian models are based on empirical dependences. However, these methods and models do not take into account a number of important factors, such as the degree of roughness and abrasion of stone materials, their embedding in asphalt concrete coating, etc.Disscussion and conclusion. The authors came to the conclusion that attempts to create a single reliable mathematical model that takes into account more than 40 factors couldn’t be realistic. Therefore, there is a task of developing a number of models that allow to have greater extent that take into account the properties of the road surface, the location and variety of marking lines and predict the functional durability of horizontal road markings for different types of road pavement more reliably.

scholarly journals Evaluation of the interaction of tyre tread with asphalt concrete coating depending on weather-climatic conditions

2021 ◽  
Vol 18 (4) ◽  
pp. 122-126
Author(s):  
I. S. Gladushevskiy ◽  
Keyword(s):  
Asphalt Concrete ◽  
Weather Conditions ◽  
Concrete Surface ◽  
Climatic Conditions ◽  
Road Surface ◽  
Coupling Coefficients ◽  
Internal Factors ◽  
The Road ◽  
Concrete Coating

The tyre tread coupling with the road surface depends on a number of both external and internal factors. The controllability of the vehicle depends on the interaction between two materials. The article considers various tyre tread characteristics, the values of the coupling coefficients are determined for the tyre tread of M1 category vehicles during operation on different road conditions. The interaction of a new and worn tyre tread with the road surface has been assessed with vehicles driving on the asphalt concrete surface, taking into account weather conditions.

scholarly journals INTEGRATED APPROACH TO THE GEODESIC CONTROL OF THE INSTALLATION OF ASPHALT-CONCRETE COATING ON THE EXAMPLE OF THE CONSTRUCTION OF THE ROAD BRIDGE TRANSITION ACROSS THE KERCH SHEET

2020 ◽  
Vol 1 (1) ◽  
pp. 106-119
Author(s):  
Victor P. Goluk ◽  
Denis G. Nazarov
Keyword(s):  
Asphalt Concrete ◽  
A Priori ◽  
Integrated Approach ◽  
Geodetic Survey ◽  
Concrete Pavement ◽  
The Road ◽  
Measurement Results ◽  
Concrete Coating ◽  
Algebraic Difference ◽  
Asphalt Concrete Pavement

During the construction of bridges, special attention is paid to geometric parameters, one of the most important parameters of the rideable bed is the evenness of the bases and coatings. Geodetic works provide an integrated approach to solving the problem of controlling the flatness of the base layers, which includes: geodetic survey of the rideable canvas, verification of working documentation, control of the copying string, geometric control of the evenness of the laid asphalt concrete floor slab for the steel concrete span and bridge deck for a metal span structure. Various options for controlling the height position of a copier string and a laid asphalt concrete pavement (using trigonometric and geometric leveling) were reviewed and tested. A priori assessment of the accuracy of the measurement results for each of the methods for monitoring algebraic difference of elevations (amplitudes) was previously performed. The article proposes a combined approach to geodetic control at all stages of work on checking the evenness of the asphalt concrete pavement.

scholarly journals PROSPECTS FOR APPLICATION OF COMPLEX-MODIFIED SAND ASPHALT CONCRETE IN ROAD CONSTRUCTION

2017 ◽  
Vol 16 (4) ◽  
pp. 315-323
Author(s):  
D. Yu. Alexandrov
Keyword(s):  
Asphalt Concrete ◽  
Quartz Sand ◽  
Chemical Activation ◽  
Physical And Mechanical Properties ◽  
Road Construction ◽  
Industrial Wastes ◽  
Special Equipment ◽  
Road Asphalt ◽  
The Road ◽  
Advantages And Disadvantages

The paper considers a possibility to use sand asphalt concrete as a material for protection of asphalt concrete and cement concrete road pavements against affection of external destructive factors. Advantages and disadvantages of sand asphalt concrete road pavements have been determined in the paper. The paper provides recommendations on improvement of sand asphalt concrete properties and contains an analysis of possible variants for usage of complex-modified sand asphalt concrete in the road construction. It has been noted that according to its potentially possible physical and mechanical properties activated quartz sand being micro-reinforced by dispersive industrial wastes is considered as an efficient component for creation of constructive layers in road asphalt concrete pavements. The paper reveals only specific aspects of the efficient application of quartz sand in road asphalt concrete. The subject of the paper loоks rather interesting for regions where there are no rock deposits for obtaining broken-stone ballast but there is rather significant spreading of local quarts sand. Its successful application is connected with the necessity to develop special equipment for physical and chemical activation of sand grain surface that permits strongly to increase an adhesive strength in the area of phase separation within the “bitumen–SiO2” system. The considered problem is a topical one and its solution will make it possible to local sand in a maximum way and partially to exclude application of broken stone in road construction.

scholarly journals Study of crack resistance of asphalt concrete pavements of the streets of the city of Bryansk and roads of the Bryansk region

2018 ◽  
Vol 5 (3) ◽  
Author(s):  
Tatiana Levkovich ◽  
Zelgedin Mevlidinov ◽  
Pavel Rodin ◽  
Maxim Feshchenko
Keyword(s):  
Crack Resistance ◽  
Asphalt Concrete ◽  
Climatic Conditions ◽  
Concrete Pavements ◽  
Transverse Cracks ◽  
The Road ◽  
Road Surfaces ◽  
Internal And External Factors ◽  
Asphalt Concrete Pavement ◽  
The City

Asphalt concrete is the main type of coating the streets of the city of Bryansk and other cities of the Bryansk region, as well as roads outside settlements. A survey of the condition of asphalt concrete pavement of the streets of Bryansk and some parts of roads of other cities of the Bryansk region (streets of Surazh, Klintsy, Unecha, etc.) showed that in many areas there are surface destruction in the form of cracks: transverse, longitudinal and «grid». The presence of a crack in the coating of the road-reducing the load – bearing capacity of the road structure at the place of its formation. The crack resistance of asphalt concrete decreases during the operation of the coating due to a number of reasons: deterioration of the properties and structure of asphalt concrete under the influence of internal and external factors (water, freezing-thawing, air oxygen, ultraviolet and infrared irradiation, the nature and degree of interaction of bitumen with mineral material, the structure and composition of bitumen, etc.), low-temperature stretching, aging of the binder, etc. The authors of these studies set the task to check the quality of the properties of bitumen BND 60/90 and BND 90/130 with the introduction of polymer additives, carbon black, etc., as well as asphalt concrete mixtures with the introduction of polystyrene and polyurethane foam and other additives in the construction of road surfaces in hot summer climatic conditions to increase the crack resistance of asphalt concrete coatings. The paper presents an analysis of the main parameters of transverse cracks in the city of Bryansk on the streets: Fokina, Sovietskaja, Gorbatova, Krahmaleva, as well as road surfaces of the Bryansk region.

Analysis of the Contact Deformation of Tread Blocks

1992 ◽  
Vol 20 (4) ◽  
pp. 230-253 ◽  
Author(s):  
T. Akasaka ◽  
K. Kabe ◽  
M. Koishi ◽  
M. Kuwashima
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Deformation Behavior ◽  
Contact Deformation ◽  
The Finite Element Method ◽  
The Road ◽  
Loss Of Contact ◽  
Tread Rubber ◽  
Good Agreement ◽  
Rubber Block

Abstract The deformation behavior of a tire in contact with the roadway is complicated, in particular, under the traction and braking conditions. A tread rubber block in contact with the road undergoes compression and shearing forces. These forces may cause the loss of contact at the edges of the block. Theoretical analysis based on the energy method is presented on the contact deformation of a tread rubber block subjected to compressive and shearing forces. Experimental work and numerical calculation by means of the finite element method are conducted to verify the predicted results. Good agreement is obtained among these analytical, numerical, and experimental results.

Three Dimensional Dynamic Analyses on Stroller Wheel with Shock Absorber

2013 ◽  
Vol 387 ◽  
pp. 159-163
Author(s):  
Yi Chern Hsieh ◽  
Minh Hai Doan ◽  
Chen Tai Chang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Three Dimensional ◽  
Adaptive Finite Element Method ◽  
Adaptive Finite Element ◽  
The Road ◽  
Dimensional Finite Element ◽  
On The Road ◽  
Three Dimensional Finite Element ◽  
Element Method

We present the analyses of dynamics behaviors on a stroller wheel by three dimensional finite element method. The vibration of the wheel system causes by two different type barriers on the road as an experiment design to mimic the real road conditions. In addition to experiment analysis, we use two different packages to numerically simulate the wheel system dynamics activities. Some of the simulation results have good agreement with the experimental data in this research. Other interesting data will be measured and analyzed by us for future study and we will investigate them by using adaptive finite element method for increasing the precision of the computation results.

Influence of Transverse Cracks on Ultimate Strength of a Steel Plate Under Compression

2011 ◽  
Author(s):  
Abbas Bayatfar ◽  
Jerome Matagne ◽  
Philippe Rigo
Keyword(s):  
Finite Element ◽  
Ultimate Strength ◽  
Steel Plate ◽  
Transverse Cracks ◽  
Longitudinal Compression ◽  
Initial Imperfections ◽  
Crack Location ◽  
Linear Finite Element ◽  
Newton Raphson ◽  
Raphson Method

This study has been carried out on ultimate compressive strength of a cracked steel plate component, considering the effects of initial imperfections (transverse and longitudinal residual stresses and initial deflection, as well). The main objective of this paper is to numerically investigate the influence of crack location and crack length on ultimate strength of a steel plate under monotonic longitudinal compression. This investigation is performed through non-linear finite element (FE) analysis using ANSYS commercial finite element code in which is employed Newton-Raphson method. The FE results indicate that the length of transverse crack and especially its location can significantly affect the magnitude of ultimate strength where the steel plate is subjected to longitudinal compressive action.

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