Asphalt concrete pavement reinforced with chemical fibers

Asphalt concrete pavement which is currently built in accordance with the existing requirements does not withstand the standard service life. Various kinds of damages occur. Fiber reinforcement of asphalt concretes is one of the effective means to deal with deformations and fractures of road pavements, such as rutting, buckling, crack formation and shear. Chemical fibers serving as reinforcement are of great concern herein. The major purpose of this work was evaluation of reinforcement fibers resistance to natural environment and climatic impacts within the conditions of experimental production construction and studying compactibility of asphalt concrete mixture with fiber reinforcement. Infrared spectroscopy and physical-chemical investigations of fibers were used to study changing properties of fiber-forming polymer. Compactibility of asphalt concrete mixture with fiber reinforcement was determined upon compaction factor. Research results revealed insignificant influence of natural environment and climatic impacts on the properties of fiber reinforcement material. In order to obtain the standard compaction factor of asphalt concrete additional compacting impact is not required.

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ENSURING THE DURABILITY OF THE ASPHALT CONCRETE COATING ON THE HARD BASIS OF ROADS

The National Transport University Bulletin ◽

10.33744/2308-6645-2021-1-48-242-256 ◽

2021 ◽

Vol 1 (48) ◽

pp. 242-256

Author(s):

Onyschenko A ◽

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Fedorenko O ◽

Ianchuk L ◽

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...

Keyword(s):

Asphalt Concrete ◽

Asphalt Pavement ◽

Tensile Load ◽

Theory Of Elasticity ◽

Concrete Pavement ◽

Concrete Mixture ◽

Grain Composition ◽

Scientific Publications ◽

Track Formation ◽

Asphalt Concrete Pavement

The article is devoted to the development of practical methods to ensure the durability of asphalt pavement on a rigid basis of roads. The goal of the work. Practical methods of ensuring the durability of asphalt pavement on a rigid basis of roads are proposed. The object of research is asphalt-concrete pavement on a hard base of highways. Research method: analytical-experimental using the provisions of the theory of elasticity and thermo-viscoelasticity and experimental methods of research of track formation in asphalt concrete pavement on a rigid basis; mathematical statistics; statistical analysis of scientific publications, technical and normative literature. The article presents the features of the design of grain warehouses of asphalt mixtures, namely: The proposed features of the design of grain warehouses of asphalt concrete, taking into account the rate of resistance to track formation; Requirements for designing the grain composition of asphalt concrete of high resistance to track formation with optimization in terms of estimated service life are proposed. The conducted researches allowed to develop a method of estimating the homogeneity from the time of transportation of the asphalt concrete mixture in the car body to the object according to the resistance of asphalt concrete to the formation of the track. Requirements for checking the flow rate in the crushed-mastic asphalt-concrete mixture due to the terms of its storage and transportation have been developed, which avoids segregation of the coating. The criterion of strength of asphalt concrete pavement on a rigid basis of the highway is improved due to the consideration of different time of action of tensile load at bending that will allow to design more precisely a covering of the increased durability. The technique of the minimum admissible temperature of consolidation of asphalt concrete mix at the device of a covering on a rigid basis of highways that will allow to provide durability of a covering is offered for practical application. KEY WORDS: ASPHALT CONCRETE, TRACK RESISTANCE, GRAIN COMPOSITION DESIGN, TEMPERATURE, TRANSPORTATION, SEALING

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Elastic aftereffect in the process of asphalt concrete mixture compaction

Nauchno-tekhnicheskiy vestnik Bryanskogo gosudarstvennogo universiteta ◽

10.22281/2413-9920-2021-07-01-90-95 ◽

2021 ◽

Vol 7 (1) ◽

pp. 90-95

Author(s):

E.A. Shishkin ◽

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S.N. Ivanchenko ◽

A.A. Smolyakov ◽

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...

Keyword(s):

Asphalt Concrete ◽

Concrete Pavement ◽

Concrete Mixture ◽

Design Parameters ◽

Technological Parameters ◽

Elastic Aftereffect ◽

The Road ◽

Operating Modes ◽

Adopted Model ◽

Asphalt Concrete Pavement

Asphalt concrete of various brands is mainly used as a road surface. The quality and durability of the coating depends on its density. To achieve the required density of the asphalt concrete pavement, road rollers are used. The working body of the roller is a metal drum or a set of pneumatic tires. The article discusses the process of the asphalt concrete mixture compaction with a smooth metal drum. A rheological model of the force interaction of a smooth drum with a material is adopted, which includes elastic, viscous and plastic elements. The adopted model was corrected taking into account the investigated process of elastic aftereffect that occurs in the asphalt concrete mixture during compaction. The law of behavior of asphalt-concrete mixture with elastic aftereffect is established. A simulation model has been developed to study the behavior of a material in the process of elastic aftereffect. In the course of dynamic modeling, the relationship between the physical and mechanical characteristics of the compacted material with the design and technological parameters of the road roller was established. A statistical analysis of the design parameters of existing models of road rollers has been carried out. The results of the analysis, as well as the obtained dependencies, can be used to designate the technological modes of operation of a set of road rollers when compacting the asphalt concrete pavement of a motor road. Taking into account the elastic aftereffect when assigning the operating modes of the compaction equipment will improve the compaction efficiency, as well as the quality of the resulting coating.

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