IMPROVING THE QUALITY OF REPAIR OF NON-RIGID ROAD SURFACES WITH THE USE OF COLD ASPHALT CONCRETE MIXTURES

2021 ◽  
pp. 62-74
Author(s):  
А. Ф. Зубков ◽  
К. А. Андрианов ◽  
Б. Бехзоди
Keyword(s):  
Layer Thickness ◽  
Asphalt Concrete ◽  
High Quality ◽  
Repair Work ◽  
The Road ◽  
Concrete Mixtures ◽  
Factory Production ◽  
Air Temperatures ◽  
Road Surfaces

Постановка задачи. Необходимо рассмотреть технологию ремонта дорожных покрытий нежесткого типа с применением холодных асфальтобетонных смесей на битумах марок БНД, СГ и МГ. Требуется разработать математическую модель конструкции автомобильной дороги, позволяющую демонстрировать распределение температуры по толщине слоя покрытия в зависимости от конструктивных параметров дороги с учетом теплофизических свойств материалов и температурных условий её эксплуатации. Также надлежит уточнить влияние температуры смеси на предел прочности холодной смеси заводского производства. Следует провести ремонт выбоин покрытия в производственных условиях при пониженных температурах воздуха. Результаты. По результатам моделирования распределения температуры в слое покрытия доказано, что применение холодных асфальтобетонных смесей обеспечивает высокое качество ремонтных работ при температуре воздуха выше 30 °С. Получены данные о зависимости температуры нагрева основания от температуры воздуха и толщины слоя, которая обеспечивает температурные режимы холодной смеси при её уплотнении. Установлено, что предел прочности покрытия зависит от температуры. Максимальная величина предела прочности холодного асфальтобетона заводского производства обеспечивается при температуре уплотнения смеси 50-55 °С. Проведенный ремонт выбоин дорожного покрытия при пониженных температурах воздуха доказал возможность выполнения ремонтных работ с высоким качеством в данных производственных условиях. Выводы. Доказана эффективность нагрева основания выбоины перед укладкой холодной асфальтобетонной смеси при ремонте дорожных покрытий нежесткого типа со снижением температуры воздуха ниже 5 °С. Установлено влияние температуры основания покрытия на ее равномерное распределение в зависимости от температуры воздуха и толщины слоя покрытия при выполнении ремонтных работ. Полученные данные о зависимости предела прочности холодного асфальтобетона заводского производства от температуры воздуха позволяет определять параметры уплотняющих машин, обеспечивающих высокое качество ремонтных работ. Statement of the problem. It is essential to consider the technology of repair of road surfaces of non-rigid type using cold asphalt-concrete mixtures on bitumen grades BND, SG and MG. It is important to develop a mathematical model of the road structure that enables modeling the temperature distribution over the layer thickness, depending on the design parameters of the road considering the thermal and physical properties of materials and the temperature conditions of the road operation. It is also necessary to specify the effect of the mixture temperature on the tensile strength of the cold mixture of factory production. Potholes of the coating must be repaired at low air temperatures of different repair technologies in production conditions. Results. Based on the results of modeling the temperature distribution in the coating layer, it is proven that the use of cold asphalt-concrete mixtures ensures high quality of repair work at air temperatures above +30 ° C. The dependence of the heating temperature of the base on the air temperature and the layer thickness is obtained, which provides the temperature conditions of the cold mixture during compaction. It is established that the ultimate strength depends on temperature. The maximum value of the strength limit of cold asphalt concrete of factory production is provided at the compaction temperature of the mixture at +50-55⁰C. The repair of potholes of the road surface carried out in production conditions at low air temperatures proved the ability to perform repair work with high quality of work. Conclusions. It is proven that it is effective to heat the base of the pothole during repair on non-rigid road surfaces at low air temperatures before laying a cold asphalt-concrete mixture. The influence of the base temperature on its distribution over the layer thickness depending on the air temperature and the layer thickness during repair work is established. The obtained dependence of the strength limit of cold asphalt concrete of factory production on temperature allows us to determine the parameters of compacting machines that ensure high quality of repair work.

scholarly journals INCREASING THE RESISTANCE OF MACADAM-MASTIC ASPHALT CONCRETE TO RUT FORMATION DUE TO THE USE OF POLYMER MODIFIERS

2021 ◽  
Vol 3 (6) ◽  
pp. 27-34
Author(s):  
V. Yadykina ◽  
S. Navolokina ◽  
Anatoliy Gridchin
Keyword(s):  
Service Life ◽  
Asphalt Concrete ◽  
The Road ◽  
Mastic Asphalt ◽  
Concrete Mixtures ◽  
Complex Additive ◽  
Road Surfaces ◽  
High Elasticity ◽  
Binder Composition ◽  
Modified Binder

Rutting is an important problem in Russia today. One of the ways to improve the properties of asphalt concrete mixtures and reduce wear on road surfaces is to modify the binder with polymer additives. The aim of the work was to test the selected compositions of MMAC mixtures containing bitumen modified with the addition of sevilene and rubber for rutting resistance, which make it possible to predict the formation of plastic rut. It was revealed that when using sevilen in its composition, with an increase in the concentration of vinyl acetate, the depth of the track increases in comparison with the industrial polymer-bitumen binder. It is shown that with the introduction of a complex additive based on sevilen and rubber into the binder composition, its rutting decreases and the service life of the road surface increases, which indicates a high elasticity of the complex-modified binder. In this work, the calculation of the service life of the coating before the formation of a critical rut requiring repair of the coating is carried out. It was found that in terms of the slope of the rutting curve and the proportional depth of the rut, the compositions with sevilene and rubber are not inferior to traditional industrial PBB.

scholarly journals The Influence of Transport Load on Quality of Repair Works of Non-Rigid Pavements with Application by a Jet-Injection Method

2019 ◽  
pp. 115-121
Author(s):  
Mikhail E. Piletsky ◽  
Anatoly F. Zubkov ◽  
Konstantin A. Andrianov ◽  
Marianna A. Porozhenko
Keyword(s):  
Service Life ◽  
Road Surface ◽  
Traffic Intensity ◽  
Jet Injection ◽  
Repair Work ◽  
Injection Method ◽  
The Road ◽  
Road Surfaces ◽  
Mineral Mixture

Increased traffic intensity and increased axial Load from vehicles on road surfaces contribute to the formation of defects in the form of potholes and cracks. To improve the service Life and traffic safety timely care of the coating is required. Untimely work Leads to a decrease in the service Life of the pavement. The use of a jet-injection method of repair of road surfaces aLLows to perform work quickLy with minimaL cost in reLation to other methods of repair. The articLe considers the process of eLimination of defects on non-rigid road surfaces with the use of bitumen-mineraL mixtures by a jet-injection method. The resuLts of experimentaL studies carried out in the course of repair work on the second technicaL category road with high traffic intensity and increased axiaLLoad from vehicLes are presented. It was found out that the formation of the structure of the bitumen-mineraL mixture in the pothoLe of the road surface occurs over a reLativeLy Long period of time. Under the influence of contact stresses under the tire of the car, there are deformations of the material, the excess of whichLeads to its decompression. It is experimentaLLy proved that in order to increase the serviceLife of the repaired road surface, additionaL compaction of the bitumen-mineraL mixture is necessary. It was found that the excessLoad on the Layer of bitumen-mineraL mixture in the pothoLe coating at the stage of formation of its structure above the tensiLe strength contributes to the formation of pLastic deformations and reduce the required compaction coefficient. To improve the quaLity of repair work, it is necessary to Limit the axiaLLoad of vehicLes on the surface of the pothoLe for 20-30 days during the formation of the structure of the Laid materiaL in the pothoLe of the road surface.

scholarly journals Modeling of thermal processes in construction of nonrigid pavements using bitumen concrete mixes

2021 ◽  
Vol 23 (2) ◽  
pp. 146-161
Author(s):  
B. Behzodi ◽  
K. A. Andrianov ◽  
A. F. Zubkov
Keyword(s):  
Asphalt Concrete ◽  
Heating Temperature ◽  
Road Construction ◽  
Ambient Temperatures ◽  
The Road ◽  
Road Pavement ◽  
Concrete Mixtures ◽  
Road Surfaces ◽  
Properties Of Materials ◽  
Road Paving

The remoteness of the construction site from the production base, large volumes of work, insufficient productivity of asphalt concrete plants for the preparation of hot asphalt concrete mixtures makes urgent the use of cold bitumen concrete mixes for the road construction. The preliminary mix preparation on the production sites with preservation of its properties for several months allows to increase the duration of the construction season. Purpose. Quality improvement of construction of non-rigid road surfaces using cold bitumen concrete mixes. Materials and methods. Models of road pavement structure based on cold bitumen concrete mixes are proposed to clarify the influence of the structural, climatic, technological and thermophysical properties of materials on the pavement quality. Research results. It is shown that the construction of road surfaces using cold bitumen concrete mixes even at positive ambient temperatures, does not provide the required surface quality. Conclusions. To improve the road paving quality using cold bitumen concrete mixes is necessary to heat the base before laying the cold mix. The heating temperature of the base depends on the layer thickness and ambient temperature.

scholarly journals Investigation of the Heteroepitaxial Process Optimization of Ge Layers on Si (001) by RPCVD

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 928
Author(s):  
Yong Du ◽  
Zhenzhen Kong ◽  
Muhammet Toprak ◽  
Guilei Wang ◽  
Yuanhao Miao ◽  
...  
Keyword(s):  
High Temperature ◽  
Buffer Layer ◽  
Layer Thickness ◽  
Growth Temperature ◽  
Crystalline Quality ◽  
Initial Growth ◽  
Two Dimensional ◽  
High Quality ◽  
Reduced Pressure

This work presents the growth of high-quality Ge epilayers on Si (001) substrates using a reduced pressure chemical vapor deposition (RPCVD) chamber. Based on the initial nucleation, a low temperature high temperature (LT-HT) two-step approach, we systematically investigate the nucleation time and surface topography, influence of a LT-Ge buffer layer thickness, a HT-Ge growth temperature, layer thickness, and high temperature thermal treatment on the morphological and crystalline quality of the Ge epilayers. It is also a unique study in the initial growth of Ge epitaxy; the start point of the experiments includes Stranski–Krastanov mode in which the Ge wet layer is initially formed and later the growth is developed to form nuclides. Afterwards, a two-dimensional Ge layer is formed from the coalescing of the nuclides. The evolution of the strain from the beginning stage of the growth up to the full Ge layer has been investigated. Material characterization results show that Ge epilayer with 400 nm LT-Ge buffer layer features at least the root mean square (RMS) value and it’s threading dislocation density (TDD) decreases by a factor of 2. In view of the 400 nm LT-Ge buffer layer, the 1000 nm Ge epilayer with HT-Ge growth temperature of 650 °C showed the best material quality, which is conducive to the merging of the crystals into a connected structure eventually forming a continuous and two-dimensional film. After increasing the thickness of Ge layer from 900 nm to 2000 nm, Ge surface roughness decreased first and then increased slowly (the RMS value for 1400 nm Ge layer was 0.81 nm). Finally, a high-temperature annealing process was carried out and high-quality Ge layer was obtained (TDD=2.78 × 107 cm−2). In addition, room temperature strong photoluminescence (PL) peak intensity and narrow full width at half maximum (11 meV) spectra further confirm the high crystalline quality of the Ge layer manufactured by this optimized process. This work highlights the inducing, increasing, and relaxing of the strain in the Ge buffer and the signature of the defect formation.

scholarly journals Studi Penggunaan Plastik Polypropylene pada Campuran Asphalt Concrete-Wearing Course

CANTILEVER ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 65-71
Author(s):  
Lie Ing Tan ◽  
Wildan Reza Pahlevi
Keyword(s):  
Asphalt Concrete ◽  
Traffic Accidents ◽  
The Road ◽  
Test Parameters ◽  
Marshall Test

The quality of implementation, drainage, materials that do not meet the standards, and overloaded from the specified class of roads are the main causes of road damage. Thus violations and negligence both in the implementation or maintenance of the road can cause a lot of traffic accidents, damage to vehicles, and various things that can disrupt the comfort and safety of drivers or pedestrians. The purpose of this study was to evaluate the effect of polypropylene plastic as an additive in the Asphalt Concrete-Wearing Course (AC-WC) layer. The use of polypropylene waste used as an additive is around 2.5%; 3.5%; 4.5%; and 5.5% of the asphalt weight. Based on the results of the analysis it was concluded that the mixture of AC-WC with the addition of polypropylene plastic experienced increased stability and decreased melting. Polypropylene plastic which can be used based on the five Marshall test parameters with the highest value of stability and lowest melting is 4.5% of the weight of asphalt.

scholarly journals Prospects for Social and Economic Development of Krasnodar Krai in the Context of National Transport Infrastructural Projects

2020 ◽  
pp. 122-130
Author(s):  
Olga Patrakeeva
Keyword(s):  
Economic Growth ◽  
Transport Infrastructure ◽  
Western China ◽  
Transport Sector ◽  
Accident Rate ◽  
High Quality ◽  
Krasnodar Krai ◽  
The Road ◽  
Comprehensive Plan

The discrepancy between the pace of economic growth rates, needs of enterprises and population for transportation, quality of the road network is a significant infrastructural limitation for growth. The paper is devoted to the analysis of large scale investment projects aimed at the removal of infrastructural restrictions, i.e. the national project “Secure and High-Quality Roads” and “Comprehensive Plan for the Modernization and Expansion of Main Infrastructure”. It is noted that the project “Secure and High-Quality Roads” for Krasnodar Krai will become a prerequisite for the effectiveness of transport infrastructure. “Comprehensive Plan for the Modernization and Expansion of the Main Infrastructure” including such federal projects as “Europe – Western China”, “Sea Ports of Russia”, “Northern Sea Route”, “Railway Transport and Transit”, “Transport and Logistics Centers”, “Communications Between the Centers of Economic Growth”, “Development of Regional Airports and Routes”, “High-Speed Rail Links”, “Inland Waterways” will increase the investment activity in the transport sector of the region. The paper presents the results of statistical analysis aimed at the identification of significant economic effect from capital investments in the road infrastructure of Krasnodar Krai. It is revealed that investments into transport and communications stimulate the economic growth and also reduce the accident rate on highways in the long run. In addition, the increase in the density of paved public roads stimulates the passenger turnover in the short run and is also a significant factor in the reduction of the accident rate. The downward trend of paved roads in the total length of roads indicates the necessity to invest in the improvement of the quality of existing roads. The author emphasizes that in order to achieve the goals mentioned in the infrastructural projects under analysis, it is necessary to improve the monitoring system of content and development of the infrastructural frame of the territory, evaluate the effectiveness of administrative decisions for the accomplishment of the goals indicated in the infrastructural projects under analysis.

scholarly journals Application of Phosphogypsum in Road Construction

2021 ◽  
Vol 20 (6) ◽  
pp. 493-498
Author(s):  
Ya. N. Kovalev ◽  
V. N. Yaglov ◽  
T. A. Chistova ◽  
V. V. Girinsky
Keyword(s):  
Asphalt Concrete ◽  
Building Materials ◽  
Road Construction ◽  
Operating Costs ◽  
Capital Investments ◽  
Cultivated Land ◽  
Repair Work ◽  
Concrete Mixtures ◽  
Irreparable Harm ◽  
The Republic

Abstract. Currently the Republic of Belarus is solving the problem of processing a by-product – phosphogypsum, formed in the process of phosphorric acid production. The issue of utilization of phosphogypsum is becoming more and more relevant, and there are several reasons for this: transportation of phosphogypsum to dumps and its storage require large capital investments and operating costs; when creating phosphogypsum dumps, it is necessary to alienate large areas, sometimes even cultivated land; storage of this material in dumps, even with the neutralization of soluble impurities and with the observance of dump operational rules causes irreparable harm to the environment. There are known studies of scientists on the use of phosphogypsum for road construction as a binder for strengthening soils, foundations and repair work. The paper presents the results of experiments on obtaining road-building materials from this waste without converting it into a binder. Based on the research, a technology for the preparation of asphalt concrete mixtures with the use of mineral powder in the form of phosphogypsum dihydrate has been developed.

scholarly journals Improving The Performance of Asphalt Concrete Mixtures With Polymer Asphalt in Submerged Floods

2021 ◽  
Vol 2 (02) ◽  
pp. 62-69
Author(s):  
Yanuar Setiawan ◽  
Erlina Yanuarini ◽  
Nunung Martina ◽  
Muhammad Fathur Rouf Hasan ◽  
Rinawati Rinawati
Keyword(s):  
Asphalt Concrete ◽  
Asphalt Pavement ◽  
Water Immersion ◽  
The Road ◽  
Concrete Mixtures ◽  
Asphalt Content ◽  
The Difference ◽  
The Stability

The road conditions which is always submerged can reduce the performance of the asphalt pavement. This research was conducted to obtain the characteristics of polymer asphalt concrete against flooding. Marshall testing was carried out on conventional and polymer asphalt concrete with optimum asphalt content treated with water immersion in variations of 0 days, 0.5 days, 1 day, 2 days, and 4 days. The results show polymer asphalt can improve the durability of asphalt concrete which is submerged in floodwater. This is indicated by the difference in the stability value of 113% in the variation of immersion for 4 days.

Physical and Mechanical Properties of the Road Surface when Replacing the Finely Crushed Mineral Part of Asphalt Concrete with Porcelain Stoneware Production Waste

2021 ◽  
Vol 1043 ◽  
pp. 101-107
Author(s):  
Natalia Yatsenko ◽  
Alexandr Evforitsky ◽  
Natalya Kotenko
Keyword(s):  
Mechanical Properties ◽  
Asphalt Concrete ◽  
Water Resistance ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Type B ◽  
Grain Composition ◽  
The Road ◽  
Concrete Mixtures ◽  
Additional Hydrogen

The possibility of using waste porcelain stoneware - a high-strength non-porous, dense material as a finely crushed mineral part of asphalt concrete with 0-5 mm fraction has been established. The adhesive additive Bitaden content was revealed, that intensifies porcelain stoneware interaction with bitumen due to the additional hydrogen bonds formation, the particles’ contact plane activation with the action of van der Waals forces. The conditions for obtaining asphalt concrete mixtures of type B, grade 1 and G, grade 2 of the optimal grain composition with a reduced content of BND 60/90 bitumen have been developed. Physical and mechanical properties are characterized by an increase in the water resistance of asphalt concrete samples based on porcelain stoneware, compressive strength and shear resistance.

scholarly journals Viscosity as a possible supplement to the empirical tests of bitumen

2018 ◽  
Vol 196 ◽  
pp. 04039
Author(s):  
Michal Holý ◽  
Eva Remišová
Keyword(s):  
Asphalt Mixtures ◽  
The Road ◽  
Road Surfaces ◽  
Complex Shear ◽  
Asphalt Mix ◽  
Different Temperatures ◽  
Bituminous Binders ◽  
Empirical Tests ◽  
And Behavior

The quality of bituminous binders used in the construction and maintenance of road surfaces is currently being assessed by empirical tests based on obtaining one value for specific boundary conditions that were designed around 100 years ago. However, these tests appear to be inadequate. Under laboratory conditions, all bitumen tests have the correct values, but if the bitumen binder is used in the asphalt mix in the road, sometimes we can see no standard properties and behavior than in the laboratory. We are increasingly faced with the issue of replacing empirical bitumen tests with performance related parameters as viscosity, complex shear modulus that can better and more accurately describe the behavior of bitumen not only in the laboratory but also in asphalt mixtures. In paper the viscosity results of ten bitumen samples (50/70 and PmB 45/80-75) at different temperatures are presented and compared with empirical tests as penetration and softening point.

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