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 THERMAL CONDITIONS OF ROAD PAVEMENTS AND THEIR INFLUENCE ON MOTOR TRAFFIC

Transport ◽  
2003 ◽  
Vol 18 (1) ◽  
pp. 23-31 ◽  
Author(s):  
Alfredas Laurinavičius ◽  
Donatas Ďygas
Keyword(s):  
Asphalt Concrete ◽  
Thermal Conditions ◽  
Climatic Conditions ◽  
Concrete Pavement ◽  
Concrete Pavements ◽  
Road Asphalt ◽  
Concrete Mixtures ◽  
Research Findings ◽  
The Republic ◽  
Asphalt Concrete Pavement

The article presents the analysis of climatic conditions in the Republic of Lithuania and describes their influence on road asphalt concrete pavement. Dependence of the main properties of asphalt concrete mixtures on tempera~re is described with the help of carried out experiments. Research findings show that the probability of plastic defomations (rutting and corrugation) in asphalt concrete pavement is higher when the pavement temperature IS 20-40 C. Ptactical application of the presented conclusions and recommendations will enable to reduce the occurrence of undesirable deformations in asphalt concrete pavements and to improve traffic conditions on the roads.

scholarly journals Possibilities of using the dispersed waste of asphalt-concrete plants in the Republic of Buryatia

2018 ◽  
Vol 212 ◽  
pp. 01011 ◽  
Author(s):  
Nikolay Shestakov ◽  
Vyacheslav Tsyrenzhapov ◽  
Victoria Rosina ◽  
Andrey Komarov
Keyword(s):  
Asphalt Concrete ◽  
Concrete Mixtures ◽  
Dispersed Filler ◽  
Dust Entrainment ◽  
Mineral Powder ◽  
The Republic ◽  
Continental Climate

This article considers the possibility of using the dispersed waste of asphalt-concrete plants, namely the dust-entrainment, which is formed during the drying and heating of inert materials and accumulates in special dust-collecting facilities. The material under investigation corresponds to a finely dispersed filler used for the production of asphalt concrete mixtures for a number of features. It has been established that substitution of up to 50% of the mineral powder with its own dust-entrainment allows obtaining asphalt-concrete mixtures satisfying the requirements for the sharply continental climate.

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 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 Modifying the properties of finely ground limestone by tumbling granulation

2016 ◽  
Vol 11 (1) ◽  
pp. 41-50
Author(s):  
Oliver Macho ◽  
Maroš Eckert ◽  
Barbora Tomášová ◽  
Peter Peciar ◽  
Martin Ščasný ◽  
...  
Keyword(s):  
Building Materials ◽  
Graphical Representation ◽  
Road Construction ◽  
Mastic Asphalt ◽  
Agglomeration Process ◽  
Concrete Mixtures ◽  
Wide Range ◽  
Before And After ◽  
Positive Effect ◽  
Ground Limestone

Abstract Calcium carbonate in the form of finely ground limestone is a material that has found its application in a wide range of industries, in the chemical, rubber, agricultural, and paper industries, is used for desulfurization of boilers and other. In civil engineering, ground limestone is used for the production of building materials, plaster and mortar mixtures, as a filler in concrete mixtures, in road construction, and as an essential component of mastic asphalt. This paper deals with examining the modification of the properties of finely ground limestone by the tumbling agglomeration method. It has been shown that the components of concrete with a round grain have a positive effect on the pumping of concrete in comparison with an elongated grain or the rough surface of crushed stone. The experiments will be carried out on a granulation plate using a variety of granulation liquid. The agglomerates and their properties were compared with untreated finely ground limestone, with a focus on detecting changes in compressibility, density and particle size. The output of this paper is a description and graphical representation of the changes in the properties of ground limestone before and after the agglomeration process.

scholarly journals Effect of polymer and functional additives on the properties of bitumen and asphalt-concrete

2020 ◽  
Vol 1 (11-12) ◽  
pp. 47-49
Author(s):  
N. P. Kotenko ◽  
Yu. S. Shcherba ◽  
A. S. Evforitskiy
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Asphalt Concrete ◽  
Warm Season ◽  
Physical And Mechanical Properties ◽  
Polymeric Materials ◽  
Repair Work ◽  
Concrete Mixtures ◽  
Functional Additives ◽  
Functional Additive

The possibility of modifying the oil road bitumen of the BND 70/100 grade is investigated; it belongs to the category of viscous bitumen and is used for road works in the warm season, with an average daily temperature not lower than +5°C. The material is widely used for repair work, and for laying new roads. Copolymers of styrene with butadiene and ethylene with vinyl acetate were used as polymeric materials for polymer-bitumen binders (PBV). Their optimal concentrations were determined for obtaining PBV with increased heat resistance and elasticity. Carbon nanotubes were used as a functional additive to bitumen.. The physical and mechanical properties of modifi ed bitumen and asphalt concrete mixtures based on them are given. It was shown that the introduction of even a small amount of nanotubes into asphalt concrete leads to an increased shear stability and strength at diff erent temperatures from 0 to 50°C.

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.

MAIN INDICATORS OF BITUMENS OF THE AKTAU REFINERY PLANT

2021 ◽  
Vol 73 (1) ◽  
pp. 95-102
Author(s):  
S. S. Satayeva ◽  
◽  
K.A. Narikov ◽  
Keyword(s):  
Asphalt Concrete ◽  
Sharp Decrease ◽  
Concrete Pavements ◽  
Concrete Mixtures ◽  
Road Surfaces ◽  
Petroleum Bitumen ◽  
Technical Specifications ◽  
The Republic ◽  
Refinery Plant ◽  
Standard Terms

The practice of operating highways in the Republic of Kazakhstan shows that the durability of asphalt concrete pavements on them is much lower than the standard terms. Therefore, the maintenance of highways in a condition that meets the requirements of traffic flows is impossible without the use of new, progressive materials and technologies. The main factor affecting a sharp decrease in the service life of road surfaces is the use of lowquality bitumen in asphalt-concrete mixtures as a binder, since microcracks develop mainly in its film. The article deals with artificially synthesized bitumens of the Aktau bitumen plant: The following indicators of petroleum bitumen were studied: penetration, extensibility properties, brittleness temperature, softening and ignition temperature. It has been proven that the results obtained correspond to the technical specifications.

USE OF STEEL SLAGS IN AUTOMOBILE ROAD CONSTRUCTION

Transport ◽  
2012 ◽  
Vol 27 (2) ◽  
pp. 129-137 ◽  
Author(s):  
Kateryna Krayushkina ◽  
Olegas Prentkovskis ◽  
Andrii Bieliatynskyi ◽  
Raimundas Junevičius
Keyword(s):  
Asphalt Concrete ◽  
Manufacturing Industry ◽  
Road Construction ◽  
Raw Material ◽  
Crushed Rock ◽  
Concrete Mixtures ◽  
Stone Materials ◽  
Furnace Steel ◽  
Road Paving ◽  
The Given

Building and, especially, reconstruction and repairs of highways, call for the development of stone materials manufacturing industry. Increasing need for stone materials may be satisfied by a wide use of industrial waste and secondary resources. In road building, slag of ferrous and nonferrous metallurgy is one of the most popular wastes which are increasingly widespread with every year. Such slag is a valuable raw material for preparation of macadam materials and mineral binders serving as a base for asphalt concrete mixtures and manufacturing of cement emulsions, which are widely used in road paving. The research focused on the use of different types of slag in road construction in Ukraine. Possibilities of using crushed rock and sand as recrement slag of different production for preparation of asphalt concrete and cement mixtures to be used for road-base was studied, as well as the use of slag materials for construction of lower category roads. In the given work, the opportunity to recycle electric furnace steel-smelting slag for preparation of asphalt concrete mixtures was defined.

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