scholarly journals Bitumen aging on the surface of crushed limestone at high temperatures

2021 ◽  
Vol 263 ◽  
pp. 01005
Author(s):  
Muhammet Salihov ◽  
Evgeniy Veyukov ◽  
Ekaterina Lomakina ◽  
Lidia Malyanova
Keyword(s):  
Compressive Strength ◽  
Asphalt Concrete ◽  
Road Construction ◽  
Average Density ◽  
Ultimate Compressive Strength ◽  
Material Behavior ◽  
Crushed Stone ◽  
Simple Systems ◽  
Mineral Mixtures ◽  
Crushed Limestone

In road structural layers, mixtures of crushed limestone with oil bitumen are used as a structural material (black crushed stone), or as a part of asphalt concrete organic-mineral mixtures. Since limestone deposits are located in a great number of regions, their increased use makes it possible to reduce transportation costs in the estimated road construction cost. In the meantime, it is necessary to conduct a study of the aging of bitumen-mineral mixtures during their preparation and use in road structures when using local limestone materials. This article presents the results of the studies, during which the effect of bitumen aging on some properties of bitumen-mineral mixtures was studied using a new method. The developed method for studying bitumen aging compares favorably with the already known methods and is protected by the Patent of the Russian Federation No. 2654954. Due to this method, it becomes possible to study the effect of aging on the values of any indicator according to a single model – both complex (e.g. asphalt concrete) and simple systems (crushed stone-bitumen, sand-bitumen, etc.). This approach provides a more accurate prediction of the material behavior both during preparation and service in road structures. The execution of work involves the preliminary establishment of the optimal bitumen and crushed stone ratio, at which the highest average density and ultimate compressive strength at +20 °C is provided. Laboratory testing of samples indicated the dynamic pattern of the value of the aging coefficient and the aging rate in terms of the ultimate compressive strength at +50 °C and the elastic modulus.

scholarly journals CRUSHED STONE MASTIC ASPHALT CONCRETE USING GRAYISH TECHNOLOGIES

2020 ◽  
pp. 18-25
Author(s):  
A. Kurlykina ◽  
V. Denisov ◽  
D. Kuznecov ◽  
E. Lukash
Keyword(s):  
Asphalt Concrete ◽  
Road Construction ◽  
Quality Criterion ◽  
Quality Criteria ◽  
Physicomechanical Properties ◽  
Crushed Stone ◽  
Road Asphalt ◽  
Mastic Asphalt ◽  
Used Oil ◽  
Stone Mastic Asphalt

One of the main reasons for reducing the service life of road asphalt pavements (the appearance and development of damage in the form of ruts, various kinds of plastic deformations, potholes, cracks, etc.) is the low quality of the used oil bitumen. The physicomechanical properties of road bitumen are subject to stricter requirements, especially for organic binders used for the production of crushed stone mastic asphalt (SMA), therefore, in authors’ view, the development of bitumen binders with enhanced physicomechanical properties is one of the key and most urgent tasks in road construction. This problem is solved by introducing various modifiers into the binder. This article presents the results of a study of bitumen modified by introducing technical sulfur into the composition. The effect of binder modification on the physicomechanical properties of road asphalt concrete is shown on the example of crushed stone mastic asphalt (SMA-20) relative to base samples made to control the dynamics of changes in the properties of composites made using sulfur-raising technologies. For a comprehensive assessment of the effectiveness of modifying crushed stone mastic asphalt concrete based on various binders, a generalized quality criterion is calculated, taking into account the calculated particular quality criteria and various values of the weight coefficients. The comparison and analysis of the obtained efficiency criteria is made.

scholarly journals Structurization of poly mineral is highly concentrated poly disperse systems based on organic binders

2018 ◽  
Vol 251 ◽  
pp. 01038
Author(s):  
Eduard Kotlyarsky ◽  
Naum Uriev ◽  
Yury Vasilev ◽  
Vladimir Kochnev ◽  
Igor Sarichev
Keyword(s):  
Chemical Nature ◽  
Road Construction ◽  
Material Behavior ◽  
Contact Interactions ◽  
Disperse Systems ◽  
Physical Chemical ◽  
The Russian Federation ◽  
Technical Properties ◽  
Mineral Mixtures

At present, the quality of bitumen-mineral mixtures both on the territory of the Russian Federation and abroad is estimated by a set of em-pirical methods based on many years of experience in the use of asphalt in road construction. In different years, numerous attempts were made to theoretically substantiate the basic patterns of material behavior under the influence of various factors. The article describes the solution of this problem using the basic provisions of phys-chemical mechanics of highly concentrated disperse systems taking into account the specifics of contact interactions. As a result of researches the quantitative correlations of indicators of physical-mechanical and structural-rheological properties forming at compaction of mixtures mixes, quantitative interconnections between formative and Destructive factors with structural-mechanical and construction-technical properties of asphalt in road coverings. It has been established that the changes in the structure of asphalt have physical-chemical nature and are reliably described taking into account the basic provisions of phys-chemical mechanics and theories of contact interactions.

scholarly journals Application of water-organic emulsions for the recovery of asphalt concrete

2018 ◽  
Vol 251 ◽  
pp. 01029
Author(s):  
Nikolay Shestakov ◽  
Sergei Putilin
Keyword(s):  
Compressive Strength ◽  
Asphalt Concrete ◽  
Road Construction ◽  
Organic Substances ◽  
Asphaltic Concrete ◽  
Progressive Method ◽  
Standard Analysis ◽  
Bituminous Materials ◽  
Cold Recycling ◽  
Selection Of

Old asphalt utilization by means of its recycling and re-use in road construction is becoming increasingly important. Its technical and economic efficiency is proved and, in some countries, it reaches ten millions of tons per year. Cold recycling based, in particular, on the use of emulsified bituminous materials is more preferable. However, the modern practice of producing emulsified bituminous materials by using expensive tension-active emulsifiers and equipment of emulsion bases, often of foreign production, makes this seemingly progressive method of recycling quite expensive. In this regard, there is a need for the development of alternative activators based on organic substances. The aim is to study the possibility of water-toluene and water-kerosene emulsions creating and using as activators of cold recycling processes of asphaltic concrete road. The objectives of the study are: selection of the emulsion components ratio as well as the effect activators obtained on the strength and hydrophysical properties of recycled asphaltic concrete. In applying standard analysis of concrete based on asphalt granulate, it was found that the obtained emulsion actively interact with a sealing coat of concrete, based on asphalt granulate, and capable to form composites with a compressive strength of 1.7 MPa that allows their use in the lower layers of road coatings.

scholarly journals Influential Factors and Evaluation Methods of the Performance of Grouted Semi-Flexible Pavement (GSP)—A Review

2021 ◽  
Vol 11 (15) ◽  
pp. 6700
Author(s):  
Xiaogang Guo ◽  
Peiwen Hao
Keyword(s):  
Literature Review ◽  
Systematic Literature Review ◽  
Asphalt Concrete ◽  
Cement Mortar ◽  
Road Construction ◽  
Flexible Pavement ◽  
Evaluation Methods ◽  
Influential Factors ◽  
Future Research ◽  
Relative Evaluation

Grouted Semi-flexible Pavement (GSP) is a novel pavement composed of open-graded asphalt concrete grouted with high-fluidity cement mortar. Due to its excellent load-bearing and anti-rutting performance, it has great potential as anti-rutting overlay and surface in road construction. However, the understanding of GSP performance remains limited and pertinent findings are inconsistent. This article aims to provide a systematic literature review for the articles which were published between 2000 and 2020 on GSP, explore the problems in the recent research, identify knowledge gaps, and deliver recommendations for future research. The influential factors and the relative evaluation methods of GSP performance are summarized and discussed in this article.

scholarly journals An investigation of Teratak Buluh sand as a foam mortar aggregate material

2021 ◽  
Vol 331 ◽  
pp. 06002
Author(s):  
Elsa Eka Putri ◽  
Doni Rinaldi Basri ◽  
Bayu Martanto Adji
Keyword(s):  
Compressive Strength ◽  
Soil Depth ◽  
Peat Soil ◽  
Road Construction ◽  
Research Centre ◽  
Peat Soils ◽  
The Road ◽  
West Sumatra ◽  
Hard Soil ◽  
Cement Mixture

Riau Province has the largest peat soil on Sumatra island. Peat soil has a low bearing capacity and very deep hard soil depth, even in some places up to 16 meters depth. This condition makes the construction of roads on peat soils will experience significant and unavoidable degradation and damage if no special handling is conducted. One of the efforts to overcome the situation in road construction is the use of foam mortar which has been developed by the Road and Bridge Research Centre (PUSJATAN) in 2013 which discovered the Foam Mortar Light Pile technology. This foam mortar is a cement mixture that has a lower density than water. This study conducted further research on finding the ratio of Cement vs. Sand in foam mortar which has a specific gravity smaller than water. The sand comes from Teratak Buluh Village, Kampar Regency, Riau Province and Cement (PCC) comes from Padang City, West Sumatra Province. The cement and sand ratio was varied; 1C:0.7S, 1C:0.8S, 1C:0.9S, 1C:1.0S, 1C:1.1S and 1C:1.2S. Cylindrical samples with a diameter of 10 cm and a height of 20 cm were subjected to a compression test using a modified CBR tool at the 7 day curing time. From the test results, samples at a ratio of 1C: 0.7S and 1C: 0.8S can float in water, with a density of 0.77 tonne/m3 and compressive strength of 901.20 kPa and a density of 0.83 tonne/m3 with a compressive strength of 971.35 kPa respectively.

scholarly journals ANALYSIS INFLUENCE OF CEMENT OF THE ASPHALT PAVEMENT DEMOLITION MATERIAL ON ROADS SEMARANG-DEMAK-INDONESIA

2017 ◽  
pp. 73-78
Author(s):  
P. Pratikso ◽  
A. Purwanto ◽  
S. Sudarno
Keyword(s):  
Compressive Strength ◽  
Technology Development ◽  
Cement Content ◽  
Asphalt Pavement ◽  
Construction Material ◽  
Road Construction ◽  
Dry Weight ◽  
Natural Material ◽  
Road Infrastructure ◽  
Asphalt Cement

Natural resources such as natural material such as stone, sand, asphalt which has long been used by humans for road construction because of the limited experience any material taken will collide with the preservation of the environment so that the construction work of road infrastructure obstacles and ultimately can lead to the work stalled road infrastructure. To overcome these problems it is necessary to the implementation of the technology development of road infrastructure by using recycled (recycling). The purpose of this study is to determine levels of cement that can be used for the top layer foundation (base course) with recycled materials mixed asphalt cement / Cement Treated Recycling Base (CTRB) on road rehabilitation Semarang - Demak and to determine the uncondifined compressive strength that occurs so that the material can be reused as construction material pavement layer. This study uses an experimental method in the laboratory with a cylindrical specimen diameter of 7 cm height of 14 cm made of asphalt pavement scratching Semarang-Demak roads with cement content variation 0%, 1.5%, 3%, 4.5%, 6% and 7.5% is used for testing the uncondifined compressive strength / (UCS) at the age of 7 days, 21 days, 14 days and 28 days. The results show that the addition of cement content will increase the value of the dry weight insignificantly, but will rise UCS value significantly and utilization of scratching asphalt cement with added material from these laboratory experiments can increase the carrying capacity CTRB construction. Levels of cement that meets the requirements of Unconfined Compressive Strength (UCS) for the construction of Cement Treated Recycling Base (CTRB) is between 6% to 7.5%. According to the results of research it is economically to used cement content at average of 6.75% for road rehabilitation works Semarang - Demak has met the required UCS test.

Determination of the Strength Characteristics of Bituminous-Mineral Mixtures

2021 ◽  
Vol 625 (3) ◽  
pp. 39-43
Author(s):  
N. G. Evdokimova ◽  
◽  
N. A. Egorova ◽  
N. N. Luneva ◽  
◽  
...  
Keyword(s):  
Compressive Strength ◽  
Laboratory Method ◽  
Strength Characteristics ◽  
Optimal Parameters ◽  
Adhesive Properties ◽  
Production Technologies ◽  
Mineral Mixtures ◽  
Adhesion Index

The paper presents the results of the development and testing of a laboratory method for determining the strength characteristics of bitumen-mineral mixtures on the Lintel PK-21-01 strength meter. The conditions for testing the strength of bitumen-mineral mixtures are selected. The dependence between the bitumen adhesion index and the compressive strength of samples of bitumen-mineral mixtures based on it, determined according to the developed method, is shown. A decrease in the strength and adhesive properties of the binder was found with an increase in the content of the DST-30-01 polymer in bitumen. It is proposed to evaluate the possibility of performing research for the development of new types of bitumen products, to develop various production technologies and to select the optimal parameters for its production on the basis of standardized methods of testing bitumen and the developed methodology for determining the strength characteristics of bitumen-mineral mixtures.

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