INCREASING THE EFFICIENCY OF MINERAL POWDER FROM TECHNOGENIC  RAW MATERIALS DUE TO ITS HYDROPHOBIZATION

The data presented in the article are part of disserta-tion research on the formula development and pro-duction principle of composite material for road con-struction with phosphogypsum and secondary poly-ethyleneterephthalate use. The article provides an assessment of the existing most successful and effec-tive technologies for creating asphalt concrete pave-ments with high technical performance characteris-tics, and the key role in formula is an asphalt binder on the binary system mineral powder/oil road bitu-men basement, their main advantages and disad-vantages are described. A new technological method for the asphalt concrete mixtures production is de-scribed - pelletization by rolling, which was proposed by the authors. The paper presents the study's results to determine the structured asphalt binder technical and operational properties obtained by the method of pelletization by rolling. A brief theoretical substantia-tion of the physicochemical nature of improving a number of developed composition technical and op-erational characteristics of a structured asphalt binder is presented. The dynamics of over time changes in the main structured asphalt binder indicators, from 2005 to 2019, are given. It has been theoretically proven that in a structured asphalt binder obtained by the method of pelletization by rolling, bitumen is in a film state, and the bitumen interlayers thickness be-tween the mineral powder particles is of the order of 100 nm, which makes it possible to classify the prod-uct as a nanomaterial and determines its special properties set. The data of independent and our own experimental studies are also presented, indicating the previously obtained theoretical justification correct-ness for increasing the strength indicators, improving the water saturation indicators, and the water re-sistance coefficient. The absence of negative changes in the main technical and operational properties dy-namics for 14 years confirms the possibility of storing the mixture in a cold form outside a sealed package in an unheated room, which makes it possible to assert the possibility of preparing material for future use and transporting it over unlimited distances.

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Structured asphalt binder is a new binder type in asphalt concrete mixtures

Russian journal of transport engineering ◽

10.15862/07sats321 ◽

2021 ◽

Vol 8 (3) ◽

Author(s):

Denis Gerasimov ◽

Aleksey Ignatev ◽

Valery Gotovtsev

Keyword(s):

Asphalt Concrete ◽

Water Saturation ◽

Asphalt Binder ◽

Experimental Studies ◽

Technical Performance ◽

Concrete Mixtures ◽

Binder Type ◽

Powder Particles ◽

Mineral Powder ◽

Time Changes

The data presented in the article are part of disserta-tion research on the formula development and pro-duction principle of composite material for road con-struction with phosphogypsum and secondary poly-ethyleneterephthalate use. The article provides an assessment of the existing most successful and effec-tive technologies for creating asphalt concrete pave-ments with high technical performance characteris-tics, and the key role in formula is an asphalt binder on the binary system mineral powder/oil road bitu-men basement, their main advantages and disad-vantages are described. A new technological method for the asphalt concrete mixtures production is de-scribed - pelletization by rolling, which was proposed by the authors. The paper presents the study's results to determine the structured asphalt binder technical and operational properties obtained by the method of pelletization by rolling. A brief theoretical substantia-tion of the physicochemical nature of improving a number of developed composition technical and op-erational characteristics of a structured asphalt binder is presented. The dynamics of over time changes in the main structured asphalt binder indicators, from 2005 to 2019, are given. It has been theoretically proven that in a structured asphalt binder obtained by the method of pelletization by rolling, bitumen is in a film state, and the bitumen interlayers thickness be-tween the mineral powder particles is of the order of 100 nm, which makes it possible to classify the prod-uct as a nanomaterial and determines its special properties set. The data of independent and our own experimental studies are also presented, indicating the previously obtained theoretical justification correct-ness for increasing the strength indicators, improving the water saturation indicators, and the water re-sistance coefficient. The absence of negative changes in the main technical and operational properties dy-namics for 14 years confirms the possibility of storing the mixture in a cold form outside a sealed package in an unheated room, which makes it possible to assert the possibility of preparing material for future use and transporting it over unlimited distances

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Serpentinite Magnesium Binders, Based on Technogenic Raw Materials

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.316.1050 ◽

2021 ◽

Vol 316 ◽

pp. 1050-1054

Author(s):

V.N. Zyryanova ◽

E.V. Lytkina ◽

A.P. Ochur-Ool

Keyword(s):

Mechanical Strength ◽

Water Resistance ◽

Raw Materials ◽

Raw Material ◽

Material Base ◽

Hardening Process ◽

Dispersed System ◽

Technogenic Raw Materials

Increasing water resistance and mechanical strength of hardening magnesian binders’ products can be achieved by introducing microfillings into a hardening dispersed system. It is shown that serpentine provides an increase strength and water resistance in hydration and hardening process, being as a structure-forming component, it intensifies this process. It allows expanding the raw material base for the production of magnesia binders for construction purposes.

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Using Steel-Smelting Slag as a Raw Material Component in the Production of Asphalt Concrete

E3S Web of Conferences ◽

10.1051/e3sconf/202015706010 ◽

2020 ◽

Vol 157 ◽

pp. 06010

Author(s):

Dmitry Kuznetsov ◽

Marina Vysotskaya ◽

Albert Burgonutdinov

Keyword(s):

Asphalt Concrete ◽

Raw Materials ◽

Raw Material ◽

Crushed Stone ◽

Fatigue Properties ◽

Initial Moment ◽

Type B ◽

Steel Smelting ◽

Smelting Slag ◽

Mineral Powder

The possibility of using polydisperse steel-smelting slag for the production of type B asphalt concrete is investigated, the possibility of its use as a mineral powder, crushing screening and crushed stone is considered. As a result of the study, it was found that a promising area for the use of slag raw materials in the technology for the preparation of asphalt mixes is: as a mineral powder - without additional processing steps; crushing screening - with the development of additional technological operations. The use of raw materials as crushed stone is impractical because of the high average density of the final asphalt mixture. Based on the test results, the characteristics of the fatigue properties of asphalt concrete from fine-grained dense mixtures of type B made on mineral powders from slag and limestone were obtained. It was established that at the initial moment, a large number of cycles to failure are characterized by compositions on slag powder, however, samples from this series tested after 45 days showed a significant rigidity increase and were destroyed earlier than similar samples on limestone. Obviously, this phenomenon is associated with an increase in the brittle properties of the material due to the formation of crystallization-condensation bonds in the structure of asphalt concrete containing slag.

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New Alumosilicate Fillers Based on Sedimentary Rocks for Asphalt Concrete

MRS Proceedings ◽

10.1557/opl.2014.762 ◽

2014 ◽

Vol 1611 ◽

pp. 81-87

Author(s):

Valeria Strokova ◽

Mikhail Lebedev ◽

Irina Potapova ◽

Konstantin Sobolev

Keyword(s):

Clay Minerals ◽

Asphalt Concrete ◽

Water Resistance ◽

Asphalt Binder ◽

Sedimentary Rocks ◽

Frame Structure ◽

Filler Materials ◽

X Ray Diffraction ◽

X Ray

ABSTRACTAsphalt concrete is the most common material for highway and motorway construction. The quality of asphalt is determined, to a large extent, by properties of asphalt binder. Fillers, which are mineral powders from carbonate rocks and aggregates fines, such as limestone and dolomite, are often used in the composition of bitumen mastics affecting the performance of asphalt.This article explores the feasibility of using the fines of aluminosilicate sedimentary rocks as fillers. These materials are composed of clay minerals, which change their properties upon the contact with water. Normally, the use of such fillers is restricted because of poor water resistance and swelling of asphalt concrete. In order to improve the performance of these fillers, the thermal modification at moderate temperatures of 500–600 °C has been proposed. Such treatment provides sufficient structural stability of obtained materials and results in the reduction of water absorption of asphalt, improved water resistance (up to 2.5 times) and also, in reduced swelling (up to 9 times).It has been demonstrated that improvement in the filler performance can be achieved by a heat treatment. Such treatment induces changes in the mineral composition and converts the structure of clay minerals into the frame structure of zeolite, as confirmed by X-ray diffraction and infrared spectroscopy. Due to thermal treatment, there is a change in the acid-base properties of the surface of the filler, which is reflected in the profiles of the main adsorption centers. As a result, due to chemisorption, the modified aluminosilicate fillers are able to interact with bitumen. The application of new filler materials in asphalt concrete enables to enhance the performance.

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STUDY OF PHYSICAL-MECHANICAL PROPERTIES OF ASPHALT-CONCRETE SPECIMENS ON ACTIVATED MINERAL POWDERS OF VARIOUS COMPOSITIONS

Construction Materials and Products ◽

10.34031/2618-7183-2018-1-4-44-50 ◽

2020 ◽

pp. 44-50 ◽

Cited By ~ 1

Author(s):

Anna Trautvain ◽

V. Yadykina ◽

E. Mulenko

Keyword(s):

Asphalt Concrete ◽

Mechanical Characteristics ◽

Raw Materials ◽

Planetary Mill ◽

Concrete Mixtures ◽

Proportional Change ◽

Different Temperatures ◽

Mineral Powder ◽

Mineral Core ◽

Ferruginous Quartzites

the article presents the results of testing asphalt samples based on activated mineral powder from silica-containing raw materials. Activated filler was obtained by joint grinding of waste wet magnetic separation (WMS) of ferruginous quartzites of the Kursk Magnetic Anomaly in a spherical planetary mill in the presence of surfactants (stearic acid, adhesive additive Amdor-10) and bitumen. First of all, it should be noted that the use of activated mineral powder in the composition of asphalt concrete mixture led to an increase in the packing density of the composite. This was reflected not only in the technological process, but also contributed to the decrease in the porosity of the mineral core. It was found that the use of surfactants in the process of grinding mineral powder made it possible to increase the strength of asphalt concrete samples. However, the change in the crack resistance and shear resistance of asphalt concrete specimens, determined from the ratio of the corresponding compressive strengths, did not occur (table). This is due to the fact that there has been a proportional change in all the strength characteristics at different temperatures. Analysis of the physical-mechanical characteristics of the properties of asphalt concrete led to the conclusion that it was possible to use activated mineral powder from waste WMS as a component of asphalt concrete mixtures.

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USE OF INDUSTRIAL BY-PRODUCTS AS MINERAL POWDERS IN ROAD CONSTRUCTION

Dorogi i mosti ◽

10.36100/dorogimosti2021.24.193 ◽

2021 ◽

Vol 2021 (24) ◽

pp. 193-205

Author(s):

Ivan Kopynets ◽

◽

Volodymyr Kaskiv ◽

Оleksii Sokolov ◽

◽

...

Keyword(s):

Asphalt Concrete ◽

Industrial Waste ◽

Information Sources ◽

Raw Materials ◽

Road Construction ◽

Industrial Wastes ◽

Raw Material ◽

Concrete Mixture ◽

Mineral Powder ◽

By Products

Introduction. Mineral powder is an important structural component of asphalt concrete. Mineral powder is the output material obtained after crushing of rocks or powdery remains of the industry. It is made by grinding the following hard rocks: dolomitized limestone, dolomite, limestone. Non-carbonate raw materials and industrial wastes are also used as raw materials. Problem statement. Road construction with the arrangement of asphalt concrete pavements requires a number of components of these mixtures. Due to this, the need in scarce carbonate mineral powders is growing. Therefore, it is advisable to consider researches directed on studying a number of by-products of industry in order to use them as a mineral powder of asphalt concrete. Purpose. To analyze the existing experience of using industrial waste as a mineral powder in production of asphalt concrete mixture for further introduction and improvement of environmental safety and operational characteristics of pavement due to new road construction materials. Materials and methods. Analysis of information sources and experience in the use of industrial waste as a mineral powder and study of requirements for materials and their composition. Results. An analytical review of the experience of using industrial waste as a mineral powder was performed. Various materials have been studied and analyzed, requirements for materials, their particle size distribution, content in asphalt concrete mixture had been established. Conclusions. Analysis of information sources regarding use of industrial waste as a raw material for the production of mineral powder had determined that they are used in the whole volume in different countries and in most cases in road construction. It had been found that the use of various wastes during road construction is a viable option that needs further study.

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IMPROVING THE STRUCTURAL AND MECHANICAL PROPERTIES OF WARM ASPHALT CONCRETE BY THE METHOD OFPOLYMER-DISPERSE REINFORCEMENT

НАУЧНЫЙ ЖУРНАЛ СТРОИТЕЛЬСТВА И АРХИТЕКТУРЫ ◽

10.36622/vstu.2021.61.1.005 ◽

2021 ◽

pp. 53-61

Author(s):

А. Алшахван ◽

Ю. И. Калгин

Keyword(s):

Mechanical Properties ◽

Asphalt Concrete ◽

Water Resistance ◽

Water Saturation ◽

Warm Mix Asphalt ◽

Average Density ◽

Climatic Conditions ◽

Polymer Dispersed ◽

And Control ◽

Disperse Reinforcement

Постановка задачи. Рассматривается задача повышения структурно-механических свойств теплого асфальтобетона путем применения метода полимерно-дисперсного армирования. Исследуется влияние дозировки модификатора РТЭП-М в минеральную часть смеси на структурно-механические свойства теплой асфальтобетонной смеси (ТАС). Результаты. Приготовлены теплые асфальтобетонные смеси с температурой смешивания и формовки образцов 110-120 °C с модификатором РТЭП-М при соотношении 0,5; 1,0; 1,5 и 1,75 % в минеральной части и контрольные смеси. С их помощью изучено влияние дозировки модификатора на структурно-механические свойства ТАС. Испытаниями образцов была определена прочность при сжатии теплого асфальтобетона при температурах 0, 20 и 50 °C, а также показатели средней плотности, водонасыщения и водостойкости. Выводы. Доказана эффективность применения метода полимерно-дисперсного армирования для повышения структурно-механических свойств теплого асфальтобетона. Показано, что добавление модификатора РТЭП-М в минеральную часть теплой асфальтобетонной смеси улучшает прочностные характеристики асфальтобетона. Установлено, что путем применения метода полимерно-дисперсного армирования можно оптимизировать показатели свойств теплого асфальтобетона для его применения в холодных или жарких климатических условиях в пределах показателей, допустимых по требованиям нормативных документов. Statement of the problem. The problem of improving the structural and mechanical properties of warm asphalt concrete using the method of polymer-dispersed reinforcement is considered. The effect of the dosage of the RTEP-M modifier in the mineral part of the mixture on the structural and mechanical properties of warm mix asphalt (WMA) was studied. Results. By preparing warm mix asphalt with a mixing and molding samples at a temperature of 110-120 °C with the RTEP-M modifier at a ratio of 0.5; 1.0; 1.5 and 1.75% of the mineral part and control mixtures, the effect of the modifier dosage on the structural and mechanical properties of WMA was studied. By testing the samples, the compressive strength of warm asphalt concrete at temperatures of 0, 20 and 50 °C was determined, as well as the indicators of average density, water saturation and water resistance. Conclusions. The effectiveness of the application of the method of polymer-dispersed reinforcement to improve the structural and mechanical properties of warm concrete asphalt has been proven. It is shown that the addition of the RTEP-M modifier to the mineral part of the warm mix asphalt improves the strength characteristics of the asphalt concrete. It has been established that by applying the method of polymer-dispersed reinforcement, it is possible to optimize the properties of warm asphalt concrete for its use in cold or hot climatic conditions within the limits of indicators permissible according to the requirements of regulatory documents.

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CHANGE IN THE PROPERTIES OF ASPHALT CONCRETE WHEN USING HYDROPHOBIZED MINERAL POWDER

Bulletin of Belgorod State Technological University named after V G Shukhov ◽

10.34031/2071-7318-2020-5-4-17-23 ◽

2020 ◽

pp. 17-23

Author(s):

V. Yadykina ◽

E. Kuznetsova ◽

M. Lebedev

Keyword(s):

Asphalt Concrete ◽

Water Saturation ◽

Physical And Mechanical Properties ◽

The Road ◽

Operational Characteristics ◽

Effect Of Treatment ◽

Mineral Powder ◽

Positive Effect

One of the main factors is the structure of asphalt concrete. The most important structural component in asphalt concrete is mineral powder, the quality of which depends on the technical and operational characteristics of the road surface. Different methods of processing mineral materials are used to improve the performance of asphalt concrete in Russia and abroad. In most cases, mechanical activation with organic substances is used during the grinding process. The article presents the results of research on the effect of treatment of mineral powder with the preparation GF-1 on its characteristics and on changes in the physical and mechanical properties of asphalt concrete, as well as on indicators for long-term water saturation. It is shown that as a result of modification, the mineral powder becomes hydrophobic, which has a positive effect on the physical and mechanical characteristics of asphalt concrete with its use. It is found that hydrophobization of mineral powder significantly reduces water saturation and swelling; increases water resistance during long-term water saturation (up to 90 days) of asphalt concrete samples. As a result of hydrophobization, the temperature sensitivity of asphalt concrete increases significantly. Therefore, the composite will work reliably in a wider temperature range.

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Development of the composition of crushed stone and mastic asphalt with increased resistance to rutting for the device wear layer for roads with high traffic

Russian journal of transport engineering ◽

10.15862/22sats418 ◽

2018 ◽

Vol 5 (4) ◽

Author(s):

Dmitriy Gofman ◽

Maksim Katasonov ◽

Andrey Kochetkov ◽

Yuliya Gaydaychuk ◽

Diana Kirichuk

Keyword(s):

Asphalt Concrete ◽

Asphalt Binder ◽

Crushed Stone ◽

Protective Layers ◽

Mastic Asphalt ◽

Highly Active ◽

Mineral Components ◽

Stone Mastic Asphalt ◽

Pros And Cons ◽

Mineral Powder

The paper considers the use of crushed stone-mastic asphalt mixtures laid with a small thickness as protective layers of wear of roads. The General characteristics of mixtures and their components are given, the pros and cons, as well as the possibility of their application are given. As a mineral powder, it is recommended to use lime-containing waste (calcium oxide hydrate) of the chemical industry. The effective increase of shear resistance of the protective wear layer with the subsequent prevention of the formation of a track on the coating due to the use of lime-containing waste, which has a highly active structuring effect on bitumen with a slowdown in its aging in the asphalt binder, subject to the principles of sufficient water resistance and crack resistance of asphalt concrete. The replacement of mineral powder with lime-containing waste in the composition of crushed-mastic asphalt concrete with the same mass amount of other mineral components and bitumen indicates a significant increase in quality indicators.

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