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

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.

scholarly journals IMPROVING THE STRUCTURAL AND MECHANICAL PROPERTIES OF WARM ASPHALT CONCRETEBY THE METHOD OF POLYMER-DISPERSE REINFORCEMENT

2021 ◽  
pp. 53-61
Author(s):  
A. Alshahwan ◽  
Yu. I. Kalgin
Keyword(s):  
Mechanical Properties ◽  
Asphalt Concrete ◽  
Water Saturation ◽  
Warm Mix Asphalt ◽  
Average Density ◽  
Climatic Conditions ◽  
Regulatory Documents ◽  
Polymer Dispersed ◽  
And Control ◽  
Disperse Reinforcement

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 a warm mix asphalt with 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.

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.

INCREASING THE PROPERTIES OF ASPHALT CONCRETES BY USING THE EPOXID FORMATION

2019 ◽  
pp. 46-50
Author(s):  
Valerii Vyrozhemskyi ◽  
Ivan Kopynets ◽  
Oleksii Sokolov
Keyword(s):  
Epoxy Resin ◽  
Asphalt Concrete ◽  
Water Saturation ◽  
Asphalt Pavement ◽  
Average Density ◽  
Transverse Cracks ◽  
Epoxy Asphalt ◽  
Thermosetting Polymers ◽  
Winter Time ◽  
Epoxy Asphalt Concrete

One of the main reasons of low durability of asphalt concrete are the properties of bitumen which is the most sensitive of all its components to the action of external factors. As thermoplastic material, bitumen becomes soft at high summer temperatures leading to rutting, shear and sags formation. At low winter time temperatures it becomes fragile and rigid that due to low-temperature compression of asphalt pavement causes the occurrence of transverse cracks. The most effective direction for increasing the durability and roughness of asphalt pavement is changing the bitumen behavior by various types of additives modification. Among the issues related to all known modifiers, the least studied is the issue of using thermosetting polymers, namely, epoxy components. The main problem with the use of epoxy resins for modification is that under the influence of high process temperatures a rapid hardening of the epoxy resin after combining with the hardener occurs. Such behavior of epoxy components limits the temperature modes and the duration of process operations for the production, transportation and placement of epoxy asphalt mixtures. In this paper, the results of the study of epoxy-asphalt concrete obtained using the cut-back bitumen are presented. The dilution of bitumen allows reducing the process temperatures of the production of epoxy asphalt concrete mixtures which increases the time for their transportation and compaction. As a result of hardening of the epoxy resin, over time, a significant increase in the strength of the epoxy asphalt concrete occurs at all temperatures. The rate of hardening of epoxy asphalt depends on the temperature of the environment. As the temperature rises, the reaction rate between the epoxy resin and the hardener increases, which is reflected in the growth of the strength of the epoxy asphalt concrete at all test temperatures, the more intense evaporation of the solvent and, consequently, the growth of water saturation and the decrease in average density. Keywords. epoxy binder, epoxy asphalt concrete, epoxy resin, modification, cut-back bitumen.

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

2020 ◽  
Vol 3 (4) ◽  
pp. 24-30
Author(s):  
V. Yadykina ◽  
Anatoliy Gridchin ◽  
E. Kuznecova ◽  
M. Lebedev
Keyword(s):  
Asphalt Concrete ◽  
Water Resistance ◽  
Moisture Absorption ◽  
Water Saturation ◽  
Raw Materials ◽  
Maximum Shear Stress ◽  
Asphalt Binder ◽  
Before And After ◽  
Mineral Powder ◽  
Technogenic Raw Materials

a promising direction in solving the problem of obtaining high-quality asphalt concrete is the use of mineral fillers, including from industrial waste. The article considers the use of OEMK slag as a mineral powder in the asphalt concrete mix. The influence of hydrophobization of mineral powder by GF Preparation on moisture absorption and its structuring ability to change the maximum shear stress from the content of mineral powder before and after hydrophobization was studied. It is established that the treatment of the filler provides the necessary hydrophobicity of the mineral material, reduces the bituminous capacity, water saturation, porosity of the asphalt binder, and increases its strength and water resistance. The results of studies of the main characteristics of asphalt concrete on the example of a mixture of type G III of the brand showed that as a result of hydrophobization, the strength, water resistance, water saturation, and swelling of the composite significantly increase

scholarly journals FEATURES OF CONDUCTING FIELD RESEARCH AT THE OBJECTS OF THE ROAD NETWORK AND LABORATORY STUDIES OF ROAD SURFACE SAMPLES DURING THE FORENSIC CONSTRUCTION AND TECHNICAL EXAMINATION AND FORENSIC EXAMINATION OF MATERIALS, SUBSTANCES AND PRODUCTS

2021 ◽  
pp. 768-785
Author(s):  
O. Posilskyi ◽  
O. Savenok ◽  
I. Chaliuk ◽  
І. Burlaka
Keyword(s):  
Asphalt Concrete ◽  
Road Network ◽  
Laboratory Tests ◽  
Water Saturation ◽  
Field Research ◽  
Average Density ◽  
Road Surface ◽  
The Road ◽  
Forensic Examination

According to the requirements of regulatory documentation, there are a large number of indicators measured for asphalt concrete. Modern expert practice shows that the forensic examination of asphalt concrete although relies on the research methods specified in GOST (National Standards of Ukraine), but requires its optimization. Carrying out field research at the objects of the road network, regulates the methodology, sequence and rules for measuring and taking samples of the road surface for laboratory tests. The main stages of research at the objects of the road network: I. Preparation for field research. II. Identification of the object on the ground. III. Inspection of the object of study in order to establish the characteristics and boundaries of the work. IV. Fixation (photo-video shooting, topography) of the performed works. V. Carrying out measurements of the volume of completed construction work. VI. Sampling. VII. Recording the results of research. VIII. Conducting laboratory tests. In turn, laboratory tests have the following main stages: I. Photo of packaging, photo of samples (center marks or cuttings). II. Numbering (marking) of research objects. III. Measuring the thickness of the center marks layers. IV. Mechanical separation of center marks or cuttings into layers. V. Washing objects and drying it to constant weight. VI. Determination of the average density of asphalt concrete. VII. Determination of water saturation. VIII. Making a pooled sample. IX. Determining the amount of astringent. X. Determination of the grain composition of the mineral part of the mixture. XI. Determination of the actual density of the mixture by pycnometric method (for RMACM). XII. Determination of residual porosity (for RMACM). XIII. Reshaping of samples (for HACM). XIV. Determination of the average density of reshaped samples. XV. Determination of water saturation of reshaped samples. XVI. Determination of compaction coefficient. XVII. Determination of compressive strength. The expert practice of the authors in this article made it possible to transform the stages of forensic examination of asphalt pavements so that the effectiveness of such examination has increased. The proposed methodology, sequence and rules of field research on the objects of the road network in terms of sampling of pavement and subsequent laboratory tests of these samples, enable experts to provide a qualitative and objective conclusion.

scholarly journals Enhancement of Electrical and Mechanical Properties of Modified Asphalt Concrete with Graphite Powder

2022 ◽  
Vol 8 (1) ◽  
pp. 124-133
Author(s):  
Ziane Zadri ◽  
Bachir Glaoui ◽  
Othmane Abdelkhalek
Keyword(s):  
Mechanical Properties ◽  
Electrical Resistivity ◽  
Asphalt Concrete ◽  
Research Work ◽  
Graphite Powder ◽  
Climatic Conditions ◽  
Dissipated Energy ◽  
Modified Asphalt ◽  
Mechanical And Electrical Properties ◽  
Concrete Mixtures

A large number of additives are introduced in asphalt concrete mixtures in purpose of improving the properties of resistance, facing the increasing traffic and more severe climatic conditions. This will guarantee the good comfort for a longer exploitation time. In this article we used graphite powder as an unconventional additive, and then investigate its effect mainly on the electrical resistivity which is in context of our research work on conductive asphalt (with a resistivity around 106 Ω m), As well as on its mechanical properties evaluated using the new Fenix test that gives many information of mechanical especially dissipated energy. A significant improvement was noticed in the reduction of resistivity by reaching 1.7 × 106Ω m and also greater resistance to cracking based on variation of dissipated energy as a result we concluded that introducing graphite powder with an appropriate amount enhance both mechanical and electrical properties asphalt concrete. Doi: 10.28991/CEJ-2022-08-01-09 Full Text: PDF

MECHANICAL PROPERTIES OF WARM MIX ASPHALT CONCRETE APPLICATION USING ADVERA

2014 ◽  
Vol 1 (1) ◽  
Author(s):  
Weerakaset Suanpaga ◽  
Watcharin Witayakul ◽  
Somsak Chotichanathawewong ◽  
Thaweesak Piti-khunpongsuk
Keyword(s):  
Mechanical Properties ◽  
Flow Rate ◽  
Asphalt Concrete ◽  
Warm Mix Asphalt ◽  
Strength Index ◽  
Specification Test ◽  
Asphalt Cement ◽  
Adhesive Mixtures ◽  
Air Void ◽  
General Standard

The article presents the study of physical characteristics of warm mix asphalt cement concrete (WMA), components designed by the Marshall Method. Stability, flow rate, strength index, air void, and percent voids in mineral aggregate (VMA) of a total of 77 specimens were examined as a general standard specification test of the Department of Highways, Thailand. Limestone was used as aggregate. Adhesive mixtures of asphalt grade 60/70 were mixed with admixture “ADVERA” to the ratios of 0.20%, 0.25%, and 0.30% by weight of aggregate. WMA-mixing and compaction temperatures were controlled at 115°C, 120°C, and 125°C. The results were that the asphalt cement mixed with 0.25% of ADVERA (by total mixed) at 125°C shows the best mechanical properties standard, with higher value of stability (2,200lbs, i.e., more than the standard 1,800lbs), flow rate, air void, VMA and hardness index. Finally, this study indicates that asphalt concrete added with admixture ADVERA (WMA) could reduce the mixing and compaction temperature during production processes from >160°C to ≤ 125°C.

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