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.

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 Modeling the surface stored thermal energy in asphalt concrete pavements

2016 ◽  
Vol 20 (suppl. 2) ◽  
pp. 603-610
Author(s):  
Bojan Matic ◽  
Hasan Salem ◽  
Vlastimir Radonjanin ◽  
Nebojsa Radovic ◽  
Sinisa Sremac
Keyword(s):  
Neural Networks ◽  
Regression Analysis ◽  
Wind Speed ◽  
Solar Radiation ◽  
Air Temperature ◽  
Asphalt Concrete ◽  
Concrete Pavements ◽  
New Models ◽  
Pavement Temperature ◽  
The Republic

Regression analysis is used to develop models for minimal daily pavement surface temperature, using minimal daily air temperature, day of the year, wind speed and solar radiation as predictors, based on data from Awbari, Lybia,. Results were compared with existing SHRP and LTPP models. This paper also presents the models to predict surface pavement temperature depending on the days of the year using neural networks. Four annual periods are defined and new models are formulated for each period. Models using neural networks are formed on the basis of data gathered on the territory of the Republic of Serbia and are valid for that territory.

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 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 Modification of bituminous binders for guss asphalt

2021 ◽  
Vol 274 ◽  
pp. 02011
Author(s):  
Marina Vysotskaya ◽  
Anastasia Kurlykina ◽  
Artem Shiryaev ◽  
Anna Tkacheva ◽  
Dmitry Litovchenko
Keyword(s):  
Asphalt Concrete ◽  
Raw Material ◽  
Structural Defects ◽  
Concrete Pavements ◽  
Self Healing ◽  
Modified Bitumen ◽  
Concrete Mixtures ◽  
Bridge Structures ◽  
Bituminous Binders ◽  
Thermal Stability Of

Over the past few years, the research of the use of cast asphalt concrete mixtures in the upper layers of the coating of bridge structures has been actively carried out. The experience gained allows us to conclude that one of the most common effective ways to improve the durability and thermal stability of cast asphalt concrete pavements is the use of modified bituminous binders. The modified bitumen part of cast asphalt concrete acts as a medium capable of initiating the «self-healing» of the composite, independently eliminating structural defects. This study aims to research the rheological characteristics of modified bituminous binders. Bitumen grade BND 50/70 was used as a raw material in the study; the following types of additives were used as its modifiers: rubber modifier (RM), EVATHERM and SBS. The optimal concentrations of the proposed additives for modification allowing to achieve the effect of structuring the mastic component of cast asphalt concrete with insignificant increases in the temperatures of mixing and compaction of mixtures based on them have been revealed.

scholarly journals PENELITIAN PENAMBAHAN BAHAN BATU PADAS PADA CAMPURAN ASPAL BETON

2019 ◽  
Vol 2 (1) ◽  
pp. 154
Author(s):  
Supriadi Supriadi ◽  
Yosef Cahyo ◽  
Ahmad Ridwan ◽  
Agata Iwan Candra
Keyword(s):  
Compressive Strength ◽  
Asphalt Concrete ◽  
Coarse Aggregate ◽  
Asphalt Binder ◽  
Strong Stability ◽  
Average Height ◽  
Optimum Level ◽  
Fine Aggregate ◽  
Concrete Mixtures ◽  
Technical Specifications

Asphalt Concrete (Hotmix) is a mixture of coarse aggregate, fine aggregate and filler (Filler) with asphalt binder in high temperature conditions with the composition studied and regulated by technical specifications. In this study, asphalt concrete mixtures were given materials additional padas. This addition was carried out to study and determine the effect of padas on the asphalt concrete mixture with the addition of 5%, 10%, and 15%. Compressive strength specimens in the form of cylinders with a diameter of 10.09 cm and an average height of 7.8 cm. Testing is done after 2 days. Asphalt with the addition of 5% padas is better able to produce a better value of stability than others. The addition of padas rock produced a strong stability of 5% at 888.0747 kg, 10% at 598,199 kg, 15% at 441,6391 kg. To reach the optimum level, the mixture on concrete asphalt ranges < 5%Aspal Beton (Hotmix) adalah campuran agregat kasar, agregat halus, dan bahan pengisi (Filler) dengan bahan pengikat aspal dalam kondisi suhu tinggi (panas) dengan komposisi yang diteliti dan diatur oleh spesifikasi teknis.. Pada penelitian ini, campuran aspal beton diberi bahan tambahan batu padas. Penambahan ini dilakukan untuk mempelajari dan mengetahui pengaruh batu padas pada campuran aspal beton dengan penambahan 5%, 10%, dan 15%. Benda uji kuat tekan berupa silinder dengan diameter 10,09 cm dan  tinggi rata rata 7,8 cm. Pengujian dilakukan setelah 2 hari. Aspal dengan  penambahan batu padas 5% lebih mampu menghasilkan  nilai stabilitas yang lebih baik dari pada yang lainya. Penambahan batu padas menghasilakan  kuat stabilitas masing masing yaitu 5% sebesar 888.0747 kg, 10% sebesar 598.199 kg, 15% sebesar 441.6391 kg. Untuk mencapai kadar optimum maka campuran padas pada aspal beton berkisar antara < 5%

scholarly journals Repair of road surfaces using cold wet fiber containing asphalt concrete mixtures

2020 ◽  
Vol 7 (2) ◽  
Author(s):  
Sergey Andronov ◽  
Andrey Kochetkov ◽  
Igor Shashkov
Keyword(s):  
Asphalt Concrete ◽  
Water Film ◽  
High Strength ◽  
Asphalt Mixtures ◽  
Crushed Stone ◽  
Regulatory Requirements ◽  
Good Adhesion ◽  
Concrete Mixtures ◽  
Road Surfaces ◽  
Mineral Powder

During the construction of experimental sections of road surfaces in v. Ust-Kurdyum of the Saratov district of the Saratov region has been established the efficiency of production and application of cold fiber-containing dispersed-reinforced asphalt concrete mixtures with dispersed bitumen. A method for accelerating the formation of the structure of cold fiber-containing asphalt concrete by heat treatment of its surface is studied. Dispersed bitumen after drying the water film has good adhesion to concrete, asphalt concrete and other materials. The asphalt concrete formed as a result of curing on the basis of dispersed bitumen is high-strength, chemical-resistant, hydrophobic and environmentally friendly, corresponding to the existing regulatory requirements for asphalt concrete. For the production of asphalt mixtures, mass-produced equipment is suitable using materials commonly used in hot asphalt concrete: crushed stone, sand, mineral powder and bitumen. Operations on drying and heating of crushed stone and sand are excluded from the technological process. Asphalt concrete mix does not stick to the surface of rubberized rollers of vibratory rollers, which allows compacting mixtures with a high content of mineral powder at any time. There are fewer cracks on the surface of the compacted layer than when using a smooth-rolling roller. The technology is recommended for extended use on roads and streets of localities, and highways with low traffic intensity.

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.

Sign in / Sign up

Export Citation Format

Share Document