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.

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.

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 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.

Increasing the Weathering Resistance of Asphalt by Nanomodification

2019 ◽  
Vol 945 ◽  
pp. 147-157 ◽  
Author(s):  
Sergei Sergeevich Inozemtcev ◽  
Evgeniy V. Korolev
Keyword(s):  
Asphalt Concrete ◽  
Water Saturation ◽  
Iron Hydroxide ◽  
Mineral Component ◽  
Winter Climate ◽  
Variable Water ◽  
Loss Of Strength ◽  
Highly Porous ◽  
Weathering Resistance

The comparative analysis of quality indicators of asphalt concrete and methods of their control is discussed in the present article. Classifications of modifiers for improving the quality of asphalt concrete are given. Novel nanoscale modifier for the improvement the resistance to climatic influences on asphalt is developed. The nanomodifier is based on sols of iron hydroxide and silicic acid. Nanomodification consists in processing of the mineral component by nanomodifier; such processing leads to the formation of nanoscale layer on the surface of the mineral carrier. As a mineral carrier we propose a highly porous mineral diatomite powder. The influence of the nanomodifier on the weathering resistance of asphalt concrete is investigated. Resistance to climatic influences was estimated by loss of strength after one nominal year of exposure. To simulate environmental impacts, an environmental chamber was used. The specimens were held in conditions that correspond to combination of summer and winter climate. One nominal year of exposure included 10 cycles of variable water saturation-drying at a temperature of 20 °C and 10 cycles of freezing-thawing (freezing was performed at –20 °C, thawing – at 20 °C). Saturation-drying and freezing-thawing duration was four hours. It was shown that by means of nanomodification the weathering resistance can be increased by 36 %.

Physico-mechanical properties of asphalt concrete incorporated with encapsulated cigarette butts

2017 ◽  
Vol 153 ◽  
pp. 69-80 ◽  
Author(s):  
Abbas Mohajerani ◽  
Yasin Tanriverdi ◽  
Bao Thach Nguyen ◽  
Kee Kong Wong ◽  
Harin Nishamal Dissanayake ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Asphalt Concrete ◽  
Cigarette Butts

scholarly journals Effect of Modified Bitumen on Physico-Mechanical Properties of Asphalt Concrete

2013 ◽  
Vol 7 (4) ◽  
pp. 467-470 ◽  
Author(s):  
Mykhailo Nykypanchuk ◽  
◽  
Yurii Hrynchuk ◽  
Mykola Olchovyk ◽  
◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Asphalt Concrete ◽  
Modified Bitumen
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