scholarly journals Influtnce analysis of 09Г2С and 30MnB5 steels thermo cyclic treatment on strength characteristics of road construction machines working bodies

2021 ◽  
Vol 18 (2) ◽  
pp. 180-190
Author(s):  
A. P. Scherbakov ◽  
A. E. Pushkarev ◽  
T. V. Vinogradova
Keyword(s):  
Grain Size ◽  
Comparative Analysis ◽  
Mechanical Characteristics ◽  
Road Construction ◽  
Thermal Action ◽  
Graphical Form ◽  
Boron Steel ◽  
Construction Machinery ◽  
Cyclic Treatment ◽  
Physical And Mechanical Characteristics

Introduction. The ways of increasing the reliability of road construction machinery operation are considered. As a result, an option is proposed to replace the used 09Г2С steel with 30MnB5 boron steel. Using the example of a motor grader blade, the force effects on this working body of the road construction machinery are analyzed. In order to increase the level of physical and mechanical characteristics of 09Г2С and 30MnB5 steels, they are additionally exposed to thermo cyclic treatment. The experimental studies about the influence of this type thermal action on the structure and properties of steels are described. The comparative analysis of the obtained characteristics allows making a conclusion about the possibility of the considered replacement.Materials and methods. Through the metallographic analysis the influence of the number of thermal effects cycles on the grain size of steel is investigated. Alongside a set of physical and mechanical characteristics of these steels was determined at various stages of the thermo cyclic treatment.Results. It was determined that an increasing the level of physical and mechanical characteristics of the studied steels is possible through the use of thermo cyclic treatment. This is achieved by producing a fine-grained metal structure with a higher strength. The dependence of the tensile strength and yield strength of the steels under investigation on the number of cycles of thermal action is considered. Some correlation relationships were selected to describe these dependencies. The relationship between the yield stress and ultimate strength of 09Г2С and 30MnB5 steels and the grain size is considered. All investigated dependencies are presented in graphical form.Discussion and conclusion. Based on a comparative analysis of the complex of physical and mechanical characteristics, the conclusion about the possibility of replacing 09Г2С steel with 30MnB5 steel was made.

Influence of the Mechanical Activation of Fly Ash on Strength of Ground Concrete Based on Waste Production

2021 ◽  
Vol 25 (11) ◽  
pp. 36-41
Author(s):  
D.V. Bespolitov ◽  
N.A. Konovalova ◽  
O.N. Dabizha ◽  
P.P. Pankov ◽  
E.A. Rush
Keyword(s):  
Fly Ash ◽  
Specific Surface ◽  
Mechanical Activation ◽  
Equilibrium Condition ◽  
Mechanical Characteristics ◽  
Road Construction ◽  
Waste Production ◽  
Direct Use ◽  
Silicon Oxygen ◽  
Physical And Mechanical Characteristics

The possibility of utilization of inactive fly ash in road concrete compositions by bringing of ash into a non-equilibrium condition with increased reactivity by mechanical activation in a vibration eraser is investigated. It was revealed that the optimal content of binder and fly ash in samples of soil concrete was 8 and 10 wt. %, respectively. It is shown that, due to mechanical activation, the specific surface area of fly ash increases by 2 times, dehydration and carbonization occur and silicon is replaced by aluminum in silicon-oxygen tetrahedra. It has been established that an increase of the content of crystalline carbonate phases is the reason for an increase in the strength of ground concrete. It is determined that the introduction of mechanoactivated fly ash into the composition of soil concretes contributes to increasing their physical and mechanical characteristics to the maximum strength grade M100. This indicates the competitiveness of ground concrete and the possibility of direct use of inactive fly ash in road construction.

EXPERIMENTAL STUDY OF THE EFFECT OF WATERPROOF MATERIAL ON WATER-THERMAL REGIME OF THE SOIL SAMPLE

2015 ◽  
Vol 5 (4) ◽  
pp. 53-58
Author(s):  
Tatiana Vladimirovna PERMITINA
Keyword(s):  
Experimental Study ◽  
Soil Sample ◽  
Active Layer ◽  
Thermal Regime ◽  
Mechanical Characteristics ◽  
Road Construction ◽  
The Road ◽  
Far North ◽  
Temperature And Humidity ◽  
Physical And Mechanical Characteristics

This article deals with the problem of water and thermal regime of subgrade of the road in the far north. The measures to regulate water and thermal regime of soil of roadbed are described. An experimental study to evaluate the effect of the waterproof materials on the temperature and humidity regime of the road construction. The tasks, aimed at identifying patt erns of change in the physical and mechanical characteristics and the migration of moisture in the subgrade of the road and in the active layer of permafrost, reinforced waterproof element, are set.

scholarly journals Evaluation of the benefits of utilization of fly ash as a material for road subgrade

2018 ◽  
Vol 239 ◽  
pp. 05016 ◽  
Author(s):  
Nikola Obradović
Keyword(s):  
Fly Ash ◽  
Power Plants ◽  
Mechanical Characteristics ◽  
Thermal Power ◽  
Road Construction ◽  
High Plasticity ◽  
Traffic Level ◽  
High Plasticity Clay ◽  
Medium Plasticity Clay ◽  
Physical And Mechanical Characteristics

The assessment of potential effects of the application of fly ash in road construction was based on the results of tests of fly ash from two thermal power plants in Serbia and three characteristic soil types: the medium plasticity clay, silty-sandy clay and high plasticity clay. The physical and mechanical characteristics of the stabilization of the above three types of soils with different percentages of fly ash and stabilizers (cement/lime) were determined in the study, and pavement designs for three traffic levels, from 1,000 to 10,000 vehicles/day were developed. The savings that can be achieved by using fly ash are going up to 16.8% depending on the type of material in the subgrade and the level of traffic. The potential savings are higher if the subsoil has lower bearing capacity, and if the traffic level is higher.

scholarly journals Formation of Surface Ultrafine Grain Structure and Their Physical and Mechanical Characteristics Using Vibration-Centrifugal Hardening

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Volodymyr Kyryliv ◽  
Yaroslav Kyryliv ◽  
Nataliya Sas
Keyword(s):  
Grain Size ◽  
Wear Resistance ◽  
Mechanical Characteristics ◽  
Grain Structure ◽  
Ultrafine Grain ◽  
Electrochemical Characteristics ◽  
Surface Microhardness ◽  
Ultrafine Grain Structure ◽  
Physical And Mechanical Characteristics

The vibration-centrifugal hardening forms a gradient ultrafine grain structure of the ferritic class with a grain size of 190 nm and a surface microhardness of 8.9 GPa and a depth of up to 6 mm on the surface of 40 Kh steel of the ferritic-pearlitic structure. These parameters are formed due to an increase in the mass of the tool that acts on the processed surface through the balls and depend on the treatment modes. This surface ultrafine grain structure increases the wear resistance properties of steel in oil and oil-abrasive environment and improves the electrochemical characteristics.

BENCH DESIGN AND STUDY OF PHYSICAL AND MECHANICAL CHARACTERISTICS OF A TEAT CUP LINER WITH ANTIBACTERIAL FILLER

2020 ◽  
pp. 22-26
Author(s):  
YURY G. IVANOV ◽  
◽  
YELENA V. MASHOSHINA ◽  
LYUDMILA N. VERLIKOVA ◽  
DARIA G. GELETIY ◽  
...  
Keyword(s):  
Mechanical Characteristics ◽  
Physical And Mechanical Characteristics

Discharge-pulse Geotechnical Electro Discharge Technology of Bases Strengthening

2020 ◽  
Vol 787 (12) ◽  
pp. 63-65
Author(s):  
N.S. Sokolov
Keyword(s):  
Bearing Capacity ◽  
Mechanical Characteristics ◽  
Discharge Pulse ◽  
Zero Values ◽  
Traditional Technologies ◽  
Negative Friction ◽  
Geotechnical Problems ◽  
Physical And Mechanical Characteristics

The problem of increasing the bearing capacity of the base is an relevant problem in modern geotechnical construction. When significant loads are transmitted to the base, the use of traditional technologies is not always justified. Often there is an urgent need to use non-standard ways to strengthen the bases. In many cases, the geotechnical situation is aggravated by the presence of weak underlying layers with unstable physical and mechanical characteristics in engineering-geological sections. When strengthening such bases with the help of traditional piles, the latter can get negative friction, which significantly reduces their bearing capacity on the ground, sometimes reaching zero values. This may lead to additional precipitations of the objects being constructed and constructed in the zone of geotechnical influence. The use of ERT piles in most cases successfully solves many complex geotechnical problems.

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