Influence of Hot Asphalt Concrete Preparation Technology on its Strength

2014 ◽  
Vol 584-586 ◽  
pp. 1197-1201 ◽  
Author(s):  
Albert Y. Bashkarev ◽  
Natalia N. Bespalova ◽  
Jarosław Rajczyk
Keyword(s):  
Asphalt Concrete ◽  
Large Range ◽  
Boundary Surface ◽  
Heating Time ◽  
Preparation Technology ◽  
Asphalt Mixes ◽  
Adhesive Compound ◽  
Road Surfaces ◽  
Mineral Components

<p>Asphaltic concrete is a composite material in which its mineral components: gravel, quartz sand and mineral powder is coupled by using bitumen. The experimentally determined that the quality of adhesion depends on the temperature at which all components had been mixing of hot asphalt mixes. However, the influence heating time remains unexplored. In this work the strength of compound was investigated on the samples of granite glued with using bitumen in a large range of temperature and time. It has been found that at a temperature of 140 degrees the strength increases significantly with time, but then starts to decline. The authors argue that the process of formation and destruction of adhesive compound bitumen and minerals can be described by the thermofluctuational theory of strength. Bitumen molecules on the boundary surface of the mineral become in a compressed state. The thickness of this layer can achieve 100 µm. The durability of road surfaces and the bond strength of all components asphalt concrete depends from quality of this indicator. Researches were conducted of the influence of the same temperature and time on the mechanical properties of the bitumen, but don’t found significant changes.</p>

scholarly journals THEORETICAL PRINCIPLES AND EXPERIMENTAL DATA TO IDENTIFY STABILITY OF ASPHALT CONCRETE COMPONENTS IN FINALLY DOSED MINERAL MATERIALS

Transport ◽  
2002 ◽  
Vol 17 (1) ◽  
pp. 19-29 ◽  
Author(s):  
Henrikas Sivilevičius
Keyword(s):  
Experimental Data ◽  
Asphalt Concrete ◽  
Concrete Mixture ◽  
Sand Particle ◽  
Regression Equations ◽  
Mineral Component ◽  
Mineral Components ◽  
Concrete Mixer ◽  
Mineral Powder

The duration of asphalt concrete functioning depends on the quality of the asphalt concrete mixture used to pave the road. Grading of hot fractions sieved through technological sieves of asphalt concrete mixture, their pollution with particles of different size as well as stability influence on the quality of an asphalt concrete mixture. Each j - (j = 1...., m) aggregate mineral material or mixture is made up of two (mineral powder, particle of size less than 0,09 or 0,071 mm, and sand, particle of size from 2 to 0,09 mm or 5-0,071 mm) or three (crushed stone, particle size is larger than 2 or 5 mm) mineral components (i = 1, ..., k) . When required technological operations of asphalt concrete mixture production are carried out, the quantity and stability of any i - component in mineral materials change when they move through an asphalt concrete mixer. The more stable the quantity of mineral components in mineral materials (especially in finally dosed) is, the more uniform the composition of asphalt concrete mixture is produced. The experiments showed that when asphalt concrete mixture is produced applying a traditional technology in an asphalt concrete mixer of model D-597, D-508-2A, D-645-3 andD-590, sieved hot fractions of 0–5 mm and 5–15 are polluted with particles of different size by more than 10 per cent; and this pollution is neither uniform nor stable. Following a well-known theory, an average quadratic deviation σ of arithmetic undersized particles sieved through laboratory sieves ~aggregate mineral materials is the greatest when their mean X makes up 50 per cent; therefore, hot fractions of 0–5 mm and 5–15 mm were produced on the experimental data obtained from production as well as regression equations σ = ƒ( X )of statistical indeces of cold mineral powder. The values of average quadratic deviations σ µij of mineral component quantities in those finally dosed mineral materials are obtained from curves drawn according to the regression equations. They can be used to estimate dispersion σ2 Gi of mineral component i in asphalt concrete mixture which depends on the accuracy and stability of technological factors of an asphalt concrete mixer.

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 ECONOMY OF A NON-WASTE ROAD REPAIRING AND COVERING TECHNOLOGY IN DIFFERENT COUNTRIES

2017 ◽  
Vol 6 (3) ◽  
pp. 63
Author(s):  
Dilyara Kyazymovna Izmaylova ◽  
Nikolay Dmitrievich Seliverstov
Keyword(s):  
Asphalt Concrete ◽  
Market Analysis ◽  
Asphalt Mixtures ◽  
Economic Feasibility ◽  
Commodity Market ◽  
The Road ◽  
Road Surfaces ◽  
Mineral Components ◽  
Cost Of Materials

The article questions the economic feasibility of the use of a non-waste repairing and restoration technology for the road surfaces. While writing this article there were conducted several analyses, for example: analysis of consumption volumes of mineral components of asphalt mixtures based on the geography of the commodity market, analysis of changes in cost of materials considering transport conditions. Also defined the conditions and preferential types of asphalt concrete processing in different countries.

The use of poly additive Nabicat in the feeding of laying hens

2020 ◽  
pp. 44-55
Author(s):  
S. Nikolaev ◽  
L. Andreenko
Keyword(s):  
Laying Hens ◽  
Optimal Dose ◽  
Control Group ◽  
Nutrient Metabolism ◽  
Volgograd Region ◽  
Mineral Components ◽  
Environmentally Safe ◽  
Experimental Group ◽  
Poultry Farming

In modern poultry farming the most urgent tasks are to search for and test new environmentally safe feed and economically justifi ed additives that stimulate productivity, positively aff ect the health of poultry, and consequently increase the livability of livestock and other important zootechnical traits. In order to maintain physiologically normal processes of life, metabolism and increase the level of productivity of poultry it needs mineral components and their chelated compounds. The purpose of this work was to increase the egg productivity of poultry by using the silicon-containing poly additive Nabicat in feeding young hens and laying hens. The researches have been carried out on the poultry cross Highsex Brown under the environments in CJSC “Poultry Farm “Volzhskaya” in the Sredneakhtubinsky area in the Volgograd region. In this paper, The optimal dose of the introduction of the silicon-containing poly additive Nabicat in the diets of young and laying hens of the cross Highsex Brown has been scientifi cally justifi ed and the biological value of using an organic form of silicon has been determined. The positive infl uence of the optimal dose of poly additive on growth, consumption, and digestibility, nutrient metabolism in the poultry body, as well as egg productivity and quality of the resulting egg has been revealed. Thus, the average egg productivity per 1 hen in the control group during the experiment period was 321,3 pcs., and in the 1st, 2nd and 3rd experimental groups it was 322,6 pcs., 325,8 and 325,7 pcs., which was higher than in the control group by 0,40 %, 1,40 and 1,37 %, respectively. The average egg weight in the 1st experimental group exceeded the control by 0,43 g or 0,68 %, in the 2nd experimental group by 1,16 g or 1,84 %, in the 3rd experimental group by 0,81 g or 1,28 %. The economic eff ectiveness of using the organic silicon additive in the composition of Nabicat poly additive in the feeding of laying hens has been proved. The economic eff ect due to the use of diff erent doses of the introduction of silicon-containing poly additive Nabicat in compound feed for laying hens of the 1st experimental group was 141,66 rubles, the 2nd experimental group 962,76 rubles, and the 3rd experimental group 821,89 rubles.

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 %.

Specimen Molding Method of Chip Seal in Laboratory

2011 ◽  
Vol 374-377 ◽  
pp. 1904-1907
Author(s):  
Yu Hua Li ◽  
Hai Xiang Li ◽  
Yu Xing Liu ◽  
Jing Yun Chen
Keyword(s):  
Asphalt Concrete ◽  
Visual Inspection ◽  
Performance Test ◽  
Construction Process ◽  
Molding Method ◽  
Chip Seal ◽  
Sand Patch ◽  
Emulsified Asphalt ◽  
Cushion Layer

Chip seal is most frequently used as preventive maintenance (PM) treatments on asphalt pavement. However, it’s difficult to make the performance test of chip seal in laboratory. In this paper, the specimen molding method of chip seal is established in laboratory. Firstly, considering the structure and technique condition of the original pavement, a cushion layer of asphalt concrete (AC) is used as under layer of the specimen. Secondly, the construction process of chip seal is simulated in laboratory, which includes spraying emulsified asphalt and/or glass fiber, spreading aggregate, initial rolling and conservation, post-stage rolling and conservation in interval for some time. Lastly, visual inspection and sand patch test are used to evaluate the quality of the specimen. Research results show that the method of specimen molding and test in laboratory could relatively accurately simulate, evaluate and forecast the performance of the chip seal.

scholarly journals BAHAN TAMBAH SERAT ECENG GONDOK PADA LASTON TIPE XI TERHADAP INDEKS MARSHALL TEST MENGGUNAKAN KERIKIL MANTUP

UKaRsT ◽  
2018 ◽  
Vol 2 (2) ◽  
pp. 8
Author(s):  
Sugeng Dwi Hartantyo ◽  
Rasiyo Hepiyanto
Keyword(s):  
Asphalt Concrete ◽  
Water Hyacinth ◽  
Heavy Traffic ◽  
Asphalt Mixture ◽  
Cellulose Fiber ◽  
Fine Aggregate ◽  
Traffic Loads ◽  
Marshall Test ◽  
Technical Specifications

Laston is a mixture of coarse aggregate, fine aggregate, and filler with a binder under the temperature of 145-155oC with the composition being studied and regulated by technical specifications. Laston is also known as AC (Asphalt Concrete).Laston itself is commonly used in Indonesia with continuous gradations used for heavy traffic loads. To get the addictive material is not easy and the material is expensive. Therefore, it is necessary to find alternatives to the cellulose fiber. Water hyacinth is a water weed that once grow and develop, it has high cellulose fiber content, which is about 60%.For that, done a research to add a hot asphalt mixture material that aims to improve the quality of mixed result. The selected material is natural water hyacinth. The method used is trial and error with reference of SNI 03-1737-1989. Variations used are 3%, 5%, and 7% of the asphalt weight, asphalt level used Is 5.61%.The result of this study is Marshall evaluation where the greatest score obtained for stability is 1325 kg,  Flow is 3.73 mm, Quotient Marshall is 401.02 kg/mm, VMA is 66.30%, VFWA is 19.25%, and VIM score is 54.35 %. With this result, the asphalt mixture can not be used because the results of VMA, VFWA, and VIM have not been suitable on specification of SNI 03-1737-1989.  Keywords: Laston, Asphalt Concrete, Water Hyacinth, SNI 03-1737-1989.

scholarly journals Studi Penggunaan Plastik Polypropylene pada Campuran Asphalt Concrete-Wearing Course

CANTILEVER ◽  
2020 ◽  
Vol 8 (2) ◽  
pp. 65-71
Author(s):  
Lie Ing Tan ◽  
Wildan Reza Pahlevi
Keyword(s):  
Asphalt Concrete ◽  
Traffic Accidents ◽  
The Road ◽  
Test Parameters ◽  
Marshall Test

The quality of implementation, drainage, materials that do not meet the standards, and overloaded from the specified class of roads are the main causes of road damage. Thus violations and negligence both in the implementation or maintenance of the road can cause a lot of traffic accidents, damage to vehicles, and various things that can disrupt the comfort and safety of drivers or pedestrians. The purpose of this study was to evaluate the effect of polypropylene plastic as an additive in the Asphalt Concrete-Wearing Course (AC-WC) layer. The use of polypropylene waste used as an additive is around 2.5%; 3.5%; 4.5%; and 5.5% of the asphalt weight. Based on the results of the analysis it was concluded that the mixture of AC-WC with the addition of polypropylene plastic experienced increased stability and decreased melting. Polypropylene plastic which can be used based on the five Marshall test parameters with the highest value of stability and lowest melting is 4.5% of the weight of asphalt.

scholarly journals Karakteristik Marshall Pada Campuran Asphalt Concrete – Wearing Course (AC-WC) Dengan Penambahan Styrofoam

2019 ◽  
Vol 8 (2) ◽  
pp. 51-62
Author(s):  
Ika Sulianti ◽  
Ibrahim Ibrahim ◽  
Agus Subrianto ◽  
Adelia Monita ◽  
Medici Medici
Keyword(s):  
Asphalt Concrete ◽  
Asphalt Pavement ◽  
Flexible Pavement ◽  
Asphalt Mixtures ◽  
Concrete Mixture ◽  
Pavement Performance ◽  
Food Container ◽  
Optimum Stability ◽  
Marshall Test

Styrofoam waste presents the environment issue because it is difficult to decompose. As an effort to recycle this pollutant, styrofoam can be utilized as an additive in asphalt concrete mixture. The use of additives aims to create a flexible pavement layer having good performance and meet the requirements. The purpose of this study is to find out whether the addition of styrofoam can improve the quality of asphalt mixtures, and look for alternative additives that can increase asphalt pavement performance. In this study, researchers used food container styrofoam as an addition and incorforated into Asphalt Concrete Wearing Course (AC-WC) mixture. The styrofoam content was 6.5%; 6.75%; 7% ; 7.25%; and 7.5% of asphalt weight. The optimum asphalt contentused is 5.5%. The value of the optimum stability was 3126,002 kg, found at 7.25% of styrofoam content. The best results of Marshall test was obtained at 6.5% of styrofoam content  with stability value  1362,045 kg, VIM value 4,96%, VMA 15,025%, VFA 67,800%, flow 3,44 mm, and MQ 416,338 kg / mm.

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