ALTERNATIVE TO A SUPERPAVE SYSTEM IN THE FORMATION OF REGIONAL ROAD RESEARCH INSTITUTIONS

2020 ◽  
pp. 87-96
Author(s):  
С. В. Носов
Keyword(s):  
Asphalt Concrete ◽  
Building Materials ◽  
Scientific Research ◽  
Road Construction ◽  
Main Task ◽  
Structural Elements ◽  
Regional Research ◽  
Advantages And Disadvantages ◽  
Research Institutes

Постановка задачи. Для решения сложных проблем в области дорожного строительства главной задачей в области научных исследований является на сегодняшний день формирование и развитие региональных дорожных научно-исследовательских институтов или научно-исследовательских дорожных лабораторий. Результаты. Рассмотрены достоинства и недостатки двух методологий на пути повышения качества и долговечности основных конструктивных элементов автомобильных дорог (земляного полотна и дорожных покрытий), учитывающих множество основных и второстепенных факторов. Одна из методологий достаточно хорошо известна и обеспечивает на сегодняшний день требуемый уровень качества асфальтобетона за рубежом в рамках системы Superpave. Вторая методология основывается на реологическом подходе к совершенствованию технологий уплотнения дорожно-строительных материалов и известна дорожникам пока еще мало. Выводы. Установлено, что развитие первой методологии научных исследований у нас в стране весьма затруднительно, а второй - вполне доступно и реально на базе сформированных региональных научно-исследовательских дорожных организаций. При этом концепция их формирования определяет существенные преимущества применения второй методологии. Statement of the problem. To solve complex problems in the field of road construction, the main task in the field of scientific research, which can easily and adequately develop with obtaining real results, is currently the formation and development of regional road research institutes or, in extreme cases, research road laboratories. Results. The advantages and disadvantages of two methodologies for improving the quality and durability of the main structural elements of roads (subgrade and pavement) are considered taking into account many primary and secondary factors. One of the methodologies is quite well known and presently provides the required level of quality of asphalt concrete abroad within the Superpave system. The second methodology is based on a rheological approach to improving the technology of compaction of road-building materials and little is known to road builders. Conclusions. It has been established that the development of the first methodology of scientific research in our country is very difficult, and the second is quite affordable and feasible on the basis of the formed regional research road organizations. Moreover, the concept of their formation determines the significant advantages of using the second methodology.

scholarly journals ALTERNATIVE TO SUPERPAVE SYSTEM IN THE FORMATION OF REGIONAL ROAD R&D INSTITUTE

2021 ◽  
pp. 39-49
Author(s):  
S. V. Nosov
Keyword(s):  
Asphalt Concrete ◽  
Building Materials ◽  
Scientific Research ◽  
Road Construction ◽  
Main Task ◽  
Structural Elements ◽  
Regional Research ◽  
Advantages And Disadvantages ◽  
Research Institutes

Statement of the problem. In order to solve complex problems in the field of road construction, the main task in the field of scientific research, which can easily and adequately develop with obtaining real results, is today the formation and development of regional road research institutes or, in extreme cases, research roadlaboratories.Results. The advantages and disadvantages of two methodologies on the way to improve the quality and durability of the main structural elements of roads (subgrade and pavement), taking into account many primary and secondary factors, are considered. One of the methodologies is quite well known and provides today the required level of quality of asphalt concrete abroad within the Superpave system. The second methodology is based on a rheological approach to improving the technology of compaction of road-building materials and little is known to road builders. Conclusions. It has been established that the development of the first methodology of scientific research in our country is very difficult, and the second is quite affordable and feasible on the basisof the formed regional research road organizations. Moreover, the concept of their formation determines the significant advantages of using the second methodology.

scholarly journals The use of stabilizers to improve the strength of the soil foundation of roads

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Rashidbek Hudaykulov ◽  
Tokhirjan Mirzayev
Keyword(s):  
Building Materials ◽  
Harmful Effect ◽  
Road Construction ◽  
Maintenance And Repair ◽  
Loess Soils ◽  
Strength And Deformation ◽  
Time Savings ◽  
Soil Foundation ◽  
Stability Of Water

This article describes the improvements, strength and deformation characteristics of loess soils used in the construction of road pavements with a stabilizer T-RRP. With the help of laboratory analyzes, a recommendation was developed on the use of stabilizers to improve the properties of loess soils used in the calculation of the pavement design. The use of stabilizers in road construction, in particular T-RRP, gives the following advantages: 1. Time savings during construction; 2. Saving ordinary building materials; 3. Shipping costs are eliminated; 4. Saving financial work afterwards; 5. Lack of repair later; 6. Minimal use of machines. 7. Minimal use of working force. The degree of adequacy of the project. Interested enterprises in the project are: LLC «FAYANTRANS», PEC «Avtomagistral», SRRCO «Uzavtoyul». The significance of the final results: the proposed methods of road construction, compared with traditional methods, gives the following advantages: the permissible load on roads constructed with the use of stabilizers in more than doubled compared to roads built in the usual way; reducing the thickness of the pavement by more than 25 % on the soil treated with stabilizers; built with the use of stabilizers roads increase their strength year after year; strength and stability of water-physical properties of clay soils used in the construction of roads, airfields, hydraulic structures; building with the use of stabilizers meets the requirements of ecology since it doesn’t produce harmful effect on groundwater. In addition to the advantages noted above, the use of stabilizers allows: increase the service life of coatings; get savings on maintenance and repair; increase the pace of construction; improve the quality of structures being built.

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 Characterization of Bitumen Binders on the Basis of Their Thermo-Viscous Properties

2019 ◽  
Vol 27 (1) ◽  
pp. 25-31
Author(s):  
Michal Holý ◽  
Eva Remišová
Keyword(s):  
Building Materials ◽  
Road Construction ◽  
Climate Conditions ◽  
Traffic Loads ◽  
Bituminous Binders ◽  
Empirical Tests ◽  
And Behavior ◽  
Temperature Susceptibility

Abstract Bitumen is one of the basic building materials that is mainly used in road construction. Nowadays, we can observe increased requirements for the quality of bituminous binders, which are due to increased traffic loads, changing climate conditions, and decreasing crude oil stocks. Besides “traditional” (empirical) tests (softening point, penetration), new types of tests have been developed that can better describe the quality and behavior of bitumen binders. Their composition can also be a significant part of the properties themselves. Therefore, the elemental and group composition of bitumen must also be observed. The use of the viscosity temperature susceptibility (VTS) test appears to be well suited to evaluate the properties of bitumen binders. The VTS parameter is directly dependent on the viscosity of bitumen, but it is necessary to say that VTS can be significantly affected by the composition of the bitumen. The paper is focused on determining the dependencies between the VTS and the bitumen’s composition, respectively, to find out how the composition influences the VTS.

Influence of Crumb Rubber Vulcanization Degree on the Quality of Asphalt Concrete Used in Road Construction

2020 ◽  
Vol 992 ◽  
pp. 31-35
Author(s):  
Alisa V. Karpenko ◽  
Denis V. Karpenko ◽  
Denis B. Solovev
Keyword(s):  
Mineral Composition ◽  
Asphalt Concrete ◽  
Market Price ◽  
Road Construction ◽  
Crumb Rubber ◽  
Economic Data ◽  
Climatic Zones ◽  
Pavement Thickness ◽  
Two Alternatives

Article covers the questions of economic effectivityand efficiency of implementing rut-resistant rubberized asphalt. Economic data for all road-construction climatic zones in Russia is included. Comparison is made between the two alternatives: pavement with the use of crumb rubber (RBV) and a pavement with a known stabilizing agent (SMA). Calculation is based on a market price of the additives and 0,8% dosage by the weight of the mineral composition. Calculation of the presents costs is made for the different Road climatic zones with effective pavement thickness 6 cm.

scholarly journals Extending the Service Life of Pavements

2018 ◽  
Vol 26 (1) ◽  
pp. 25-32
Author(s):  
Ivan Gschwendt
Keyword(s):  
Asphalt Concrete ◽  
Building Materials ◽  
Road Construction ◽  
Pavement Management ◽  
High Modulus ◽  
Pavement Management System ◽  
Asphalt Mix ◽  
Degradation Models ◽  
The Cost ◽  
Whole Life Cost

Abstract The cost of road construction and expenditures on the maintenance of pavements, i.e., their whole life cost, represents a lot of money. The paper describes a procedure for a pavement management system with degradation models and estimates the length of time for the rehabilitation of an asphalt pavement. Using a theory of pavement mechanics, we calculated the stresses and strains on the layers of two pavement models. High modulus asphalt concrete, an asphalt mix with a high binder content, and an asphalt mix with binder modifications are new road building materials. Prolonging the time for the rehabilitation of pavements is possible.

scholarly journals Use of the Waste Foundry Sand in the Composition of Hot Sandy Dense Asphalt Concrete

2020 ◽  
Author(s):  
Kirill Yuryevich Tyuryukhanov ◽  
Konstantin Georgievich Pugin
Keyword(s):  
Elemental Composition ◽  
Asphalt Concrete ◽  
Building Materials ◽  
Raw Materials ◽  
Road Construction ◽  
Developed Countries ◽  
Raw Material ◽  
High Quality ◽  
Foundry Sand ◽  
Waste Foundry Sand

There is an increase in motorization worldwide, which in turn requires the construction of high-quality roads and highways. In both new construction and reconstruction of the pavement, large volumes of natural mineral materials are used, placing a large technogenic load on environmental objects during their extraction. In a number of regions of the Russian Federation, there are not sufficient volumes of conditioned raw materials for the production of high-quality composite building materials, such as asphalt concrete and cement concrete mixtures. The use of industrial waste in the composition of building materials addresses this issue while both solving environmental issues and reducing the cost of road construction. This article shows that developed countries successfully use the resource potential of waste in the production of building materials. This article proposes the use of waste foundry sand as the mineral raw material in the production of asphalt concrete. The article presents research on the following: geometric shape, elemental composition of the surface of the particles of the waste foundry sand; bitumen capacity; and the adhesion of bitumen. Based on the obtained data, a technology was developed for producing hot sandy asphalt concrete in which the waste foundry sand is used as a fine mineral aggregate. Physico-mechanical properties of the obtained samples of asphalt concrete satisfy the requirements established in GOST for asphalt concrete. Keywords: waste foundry sand, asphalt concrete, industrial material, elemental composition, bitumen

scholarly journals Choice of road building technology - statistic analyses with the use of the Hellwig method

2018 ◽  
Vol 45 ◽  
pp. 00081 ◽  
Author(s):  
Izabela Skrzypczak ◽  
Wojciech Radwański ◽  
Tomasz Pytlowany
Keyword(s):  
Building Materials ◽  
Asphalt Pavement ◽  
Road Construction ◽  
Concrete Pavements ◽  
Pavement Maintenance ◽  
Road Building ◽  
The Road ◽  
Building Technology ◽  
Advantages And Disadvantages ◽  
The Moment

There are two technologies for road construction, e.g. an asphalt one and a concrete one, that exist in the market of road infrastructure at the moment and they both have their advantages and disadvantages [prof Jan Deja of Krakow Mining Academy, Cathedral of Building Materials Technology].The advantage of concrete pavement consists of the fact that it doesn’t require bigger financial expenditures within 10 – 20 years of exploitation (provided that necessary pavement maintenance treatments are carried out). In the case of asphalt pavement it is necessary to mill the wear off layer of the road already after 6-7 years. It leads to the question: which of these technologies should be chosen, which is better? The work hereby carries on analyses concerning a comparison of the technologies for road constructions; the asphalt one and the concrete one. Based on the analyses carried out with the use of the Hellwig method it was found that the achieved values of synthetic meters for asphalt and concrete pavements are close to each other, which may indicate that both technologies are comparable within the sectors taken for analyses in relation to accepted technological-technical and usability features.

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.

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