scholarly journals DESIGN AND CALCULATION OF ROAD SURFACE BY METHOD OF STRUCTURAL NUMBERS

2020 ◽  
pp. 25-30
Author(s):  
N. Gorshkova ◽  
D. Aleksandrov
Keyword(s):  
Construction Materials ◽  
Physical And Mechanical Properties ◽  
Road Construction ◽  
Ease Of Use ◽  
Road Surface ◽  
Simple Method ◽  
Concrete Mixtures ◽  
Road Surfaces ◽  
Complex Engineering ◽  
Main Components

Road surface is one of the main components of highways, its condition ensures the safety and speed of traffic. Modern road surface is a complex engineering structure: it consists of layers of road construction materials laid in stages, which have various physical and mechanical properties. These properties are taken into account to ensure the safe movement of vehicles at any time of the year at the estimated speed, while preventing accidents and reducing traffic convenience. The method of structural numbers is one of the methods for calculating roadways. The possibility of its application for the design and calculation of road surface is analyzed. The article shows the possibility of using this rather simple method used in many countries, using a specific example. Since Russia is actively switching to the design of asphalt-concrete mixtures using the Superpave method, which improves the performance of road surfaces, this method has advantages in the design and calculation of road coverings, consisting in ease of use.

Frost Heaving Soil Road Use Synthetic Adhesive Reinforcement Method

2013 ◽  
Vol 740 ◽  
pp. 759-762
Author(s):  
Hao Zeng Bao
Keyword(s):  
Mechanical Properties ◽  
Industrial Waste ◽  
Construction Materials ◽  
Reference Value ◽  
Physical And Mechanical Properties ◽  
Road Construction ◽  
Experimental Methods ◽  
Frost Heaving ◽  
The World ◽  
Rock And Soil

In many areas, there are still a development road construction materials, traditionally, often use reinforced concrete, asphalt and other adhesive method to strengthen the low strength of rock and soil anti-freeze expansion coefficient; And now all countries in the world are studying how to use industrial production waste development of new composite materials. One of the most development potential, the production of industrial waste - slime. This paper USES the Russian kazan national construction university experimental methods, in the experiment to improve frost heaving soil physical and mechanical properties of the method for the synthesis of adhesive, based on the feasibility and applicability, environmental assessment of research and analysis, for the use of adhesive put forward a lot of reference value.

scholarly journals Quality road surfacing: two stages of control over design concept

2020 ◽  
pp. 99-109
Author(s):  
Aleksey Viktorovich Kamenchukov
Keyword(s):  
Practical Importance ◽  
Road Construction ◽  
Road Surface ◽  
The Road ◽  
Design Concepts ◽  
Efficiency Assessment ◽  
Road Surfaces ◽  
Under Construction ◽  
Key Aspects

This article examines the questions of improving the quality of design concepts on construction and reconstruction of roads. The primary subject of this research is the road surface, the quality of which directly affects the convenience and safety of traffic. The author also assesses the effectiveness of the system “subgrade – road surface” in the conditions of cyclical dynamic load from vehicles and temporal variability of the characteristics of soil ground-geological environment. An overview is conducted on the relevant requirements to engineering of road surface and efficiency assessment of design concepts. The author considers the national and foreign experience of road construction, including modern software  solutions. The two key aspects of selection and efficiency assessment of design solutions are formulated. The article describes the concept, algorithm and results of implementation of comprehensive methodology for assessing efficiency of engineering and construction of road surfaces. Detailed analysis is conducted on the stages of mathematical modeling and effectiveness of the system “subgrade – road surface”. An undisputable scientific novelty of this research consists in application of the modern mathematical apparatus, methods and techniques of linear programming, together with the leading company on the development of software for design and construction of roads. The necessity and practical importance of the elaborated concept on efficiency assessment of design concepts is confirmed by implementation into the practice of road construction. The conclusion is made that the application of integrated index of the effectiveness of construction of road surfaces, coupled with software packages for assessing the stress-deformed condition of soil ground-geological systems, allow eliminated the design errors and ensure maximal reliability and safety of roads under construction of reconstruction.

scholarly journals Application of Mining Waste Powder as filler in Hot Mix Asphalt

2019 ◽  
Vol 274 ◽  
pp. 04002 ◽  
Author(s):  
Sangiorgi Cesare ◽  
Tataranni Piergiorgio ◽  
Lantieri Claudio ◽  
Mazzotta Francesco
Keyword(s):  
Asphalt Concrete ◽  
Hot Mix Asphalt ◽  
Physical And Mechanical Properties ◽  
Extraction Process ◽  
Mining Waste ◽  
Asphalt Mixtures ◽  
Limestone Filler ◽  
Concrete Mixtures ◽  
Laboratory Characterization ◽  
Main Components

Asphalt concrete mixtures are composed of two main components: aggregates and binder. The fraction of aggregates passing through the 63μm sieve is traditionally considered as filler. During years, several researches have shown the importance and the influence of filler in controlling the physical and mechanical properties of Hot Mix Asphalts (HMAs). The main objective of this research is to investigate and to assess the effects given by the use of Mining Waste Powder (MWP) within HMAs in total substitution of traditional limestone filler. The MWP used in this study is a residual of the tungsten extraction process in Panasqueira (Portugal) mine. The evaluation of properties conferred by the presence of the MWP filler within asphalt mixtures is based on a physical and mechanical laboratory characterization. For this purpose, tests have been performed both on bituminous mastics and on HMAs. Results indicate that the use of MWP in total substitution of limestone filler does not negatively affect the performances of HMAs and their bituminous mastics.

scholarly journals Modeling of thermal processes in construction of nonrigid pavements using bitumen concrete mixes

2021 ◽  
Vol 23 (2) ◽  
pp. 146-161
Author(s):  
B. Behzodi ◽  
K. A. Andrianov ◽  
A. F. Zubkov
Keyword(s):  
Asphalt Concrete ◽  
Heating Temperature ◽  
Road Construction ◽  
Ambient Temperatures ◽  
The Road ◽  
Road Pavement ◽  
Concrete Mixtures ◽  
Road Surfaces ◽  
Properties Of Materials ◽  
Road Paving

The remoteness of the construction site from the production base, large volumes of work, insufficient productivity of asphalt concrete plants for the preparation of hot asphalt concrete mixtures makes urgent the use of cold bitumen concrete mixes for the road construction. The preliminary mix preparation on the production sites with preservation of its properties for several months allows to increase the duration of the construction season. Purpose. Quality improvement of construction of non-rigid road surfaces using cold bitumen concrete mixes. Materials and methods. Models of road pavement structure based on cold bitumen concrete mixes are proposed to clarify the influence of the structural, climatic, technological and thermophysical properties of materials on the pavement quality. Research results. It is shown that the construction of road surfaces using cold bitumen concrete mixes even at positive ambient temperatures, does not provide the required surface quality. Conclusions. To improve the road paving quality using cold bitumen concrete mixes is necessary to heat the base before laying the cold mix. The heating temperature of the base depends on the layer thickness and ambient temperature.

scholarly journals Сonceptual Fundamentals for Technology of Sand Disperse-Reinforced Asphalt Concrete

2019 ◽  
Vol 18 (4) ◽  
pp. 269-273
Author(s):  
Ya. N. Kovalev ◽  
D. Yu. Alexandrov
Keyword(s):  
Mechanical Properties ◽  
Asphalt Concrete ◽  
Construction Materials ◽  
Basalt Fiber ◽  
Protective Layer ◽  
Physical And Mechanical Properties ◽  
Road Construction ◽  
Microscopy Study ◽  
Natural Sand ◽  
Operational Conditions

A problem of efficient resource usage in road branch continues to be one of the most complicated issues and requires an intensification in investigation process pertaining to possibilities for production of road construction materials of low resource intensity with high physical and mechanical properties. Technogenic wastes of the Belarusian enterprises are rather various and they need a detailed investigation. Application of such methods as IR spectrometry, probe microscopy, study of of geometric characteristics of particles and fibers make it possible to determine more active centres and reveal micro-defects that influence on strength of adhesion bond at the boundary of “fiber – binder” and physical and mechanical properties of ready-mixed asphalt concrete. Nature of basalt fiber presupposes mainly physical character of adhesion interaction at the boundary of phase separation. An increase of technogenic waste activity to enhance adhesion contacts up to chemisorption level is possible only due to preliminary fiber processing which includes cleaning, removal of foreign inclusions, etching, drying, probable sorting-out and fluffing. Industrial approbation of such technological process is not possible without development of a corresponding module or a plant. Disperse reinforment causes changes in composition and technology of sand asphalt concrete. An increase in specific surface of an aggregate, necessity of uniform distribution of fiber in terms of volume determine the required need in a binder, procedure and regimes for component mixing. Grain composition of the aggregate can be represented by crush screening and natural sand of mixture of these materials. Requirements to properties of sand disperse-reinforced asphalt concrete are formed on the basis of operational conditions and layer arrangement of the material in the design of a surface dressing. The disperse-reinforced sand asphalt concrete can perform functions of a superfine protective layer, a levelling layer or a crack stopping layer which is resistant to fatigue crack formation.

scholarly journals ANALYSIS AND JUSTIFICATION OF NORMATIVE SUPPORT OF EARTH DESIGN DESIGN IN COMPLEX ENGINEERING AND GEOLOGICAL CONDITIONS

2021 ◽  
Vol 6 (166) ◽  
pp. 81-87
Author(s):  
A. Batrakova ◽  
Y. Dorozhko ◽  
E. Zakharova
Keyword(s):  
Traffic Accidents ◽  
Road Construction ◽  
Road Surface ◽  
National Standard ◽  
Normative Documents ◽  
The Road ◽  
Traffic Conditions ◽  
Road Design ◽  
Geological Conditions ◽  
Complex Engineering

Designing of a ground cloth is the most responsible stage as destruction or inadmissible deformations of a ground cloth connected with design errors lead to decrease in reliability of all constructive elements of highways, increase in expenses for maintenance of a standard technical and operational condition of road clothes, culverts, elements. arrangement, etc. Insufficient strength of the ground structure is one of the causes of deformations and destruction of the structure of the pavement, which leads to deteriorating traffic conditions, increased damage from traffic accidents, increased cost of transportation and more. At the same time, the normative documents on road design do not contain any regulations on the procedure and methods of calculating the road surface in difficult conditions (on weak, subsidence soils, in rocky soils). Therefore, in order to further develop the list of mandatory calculations during the design of the ground, it is necessary to analyze and generalize the regulatory framework for the construction of the ground of public roads, to determine the requirements for the design of the ground in complex engineering and geological conditions. The purpose of this study is to generalize the regulatory requirements for the design of the ground of public roads in complex engineering and geological conditions. According to the results of the analysis, it is established that in the normative documents on the design of the road surface in difficult engineering and geological conditions there is no regulation on the procedure and methods of calculating the road surface in difficult conditions (on weak, subsidence soils, in rocky soils). Therefore, there is a need to develop a national standard for the design of the road surface. In the future it is necessary to summarize the existing methods of calculating the road surface, to develop a list of mandatory calculations during the design of the road, to establish requirements for the principles and procedures of road construction, to determine the boundary conditions of the road and their criteria.

CREDO RADON UA – INFORMATION MODEL FOR CALCULATION OF ROAD CONSTRACTION

2019 ◽  
pp. 34-42
Author(s):  
Volodymyr Karedin ◽  
Nadiya Pavlenko
Keyword(s):  
Design Process ◽  
Static Loading ◽  
Computer Aided Design ◽  
Experimental Studies ◽  
Construction Materials ◽  
Residual Deformation ◽  
Road Construction ◽  
Information Support ◽  
Existing Structures ◽  
Road Pavement

CREDO RADON UA software provides an automated calculation of the strength of the pavement structures of non-rigid and rigid types, as well as the calculation of the strengthening of existing structures. In the article, one can see the main features and functionality of the CREDO RADON UA software, the main points in the calculations according to the new regulations. Information support of the design process includes necessary databases, informational and helping materials that make up the full support of the pavement design process. The concept of CREDO RADON UA 1.0 software is made on the use of elasticity theory methods in calculations of initial information models of pavements. Performing optimization calculations, the roadwear in CREDO RADON UA is designed in such a way that no unacceptable residual deformation occurs under the influence of short-term dynamic or static loading in the working layer of the earth bed and in the structural layers during the lifetime of the structure. The calculation algorithms were made in accordance with the current regulatory documents of Ukraine. CREDO RADON UA software allows user to create information bases on road construction materials and vehicles as part of the traffic flow for calculations. The presented system of automated modeling makes it easier for the customer to control the quality of design solutions, to reasonably assign designs to layers of reinforcement, to quickly make comparisons of calculations of different designs for the optimal use of allocated funds. Prospects for further improvement of the program should be the results of theoretical and experimental studies on filling the databases, which are used as information support for automated design of road structures. Keywords: CREDO RADON UA, road, computer-aided design, repair project, road pavement, strengthening, construction, rigid pavement, elasticity module, a transport stream, calculation method, information support, dynamic or static loading.

Tire-Road Interactions — Harmony or Conflict?

1989 ◽  
Vol 17 (1) ◽  
pp. 66-84
Author(s):  
A. R. Williams
Keyword(s):  
Rolling Resistance ◽  
Major Effect ◽  
Road Surface ◽  
Interactive Effects ◽  
Central Theme ◽  
Water Drainage ◽  
The Road ◽  
Truck Tires ◽  
Road Surfaces ◽  
Tire Wear

Abstract This is a summary of work by the author and his colleagues, as well as by others reported in the literature, that demonstrate a need for considering a vehicle, its tires, and the road surface as a system. The central theme is interaction at the footprint, especially that of truck tires. Individual and interactive effects of road and tires are considered under the major topics of road aggregate (macroscopic and microscopic properties), development of a novel road surface, safety, noise, rolling resistance, riding comfort, water drainage by both road and tire, development of tire tread compounds and a proving ground, and influence of tire wear on wet traction. A general conclusion is that road surfaces have both the major effect and the greater potential for improvement.

scholarly journals Mortars with Recycled Aggregates from Building-Related Processes: A ‘Four-Step’ Methodological Proposal for a Review

2021 ◽  
Vol 13 (5) ◽  
pp. 2756
Author(s):  
Federica Vitale ◽  
Maurizio Nicolella
Keyword(s):  
Building Materials ◽  
Thermal Analyses ◽  
Construction Materials ◽  
Physical And Mechanical Properties ◽  
Research Trends ◽  
Mix Design ◽  
Recycled Aggregates ◽  
Design Parameters ◽  
Natural Aggregates ◽  
By Products

Because the production of aggregates for mortar and concrete is no longer sustainable, many attempts have been made to replace natural aggregates (NA) with recycled aggregates (RA) sourced from factories, recycling centers, and human activities such as construction and demolition works (C&D). This article reviews papers concerning mortars with fine RA from C&D debris, and from the by-products of the manufacturing and recycling processes of building materials. A four-step methodology based on searching, screening, clustering, and summarizing was proposed. The clustering variables were the type of aggregate, mix design parameters, tested properties, patents, and availability on the market. The number and the type of the clustering variables of each paper were analysed and compared. The results showed that the mortars were mainly characterized through their physical and mechanical properties, whereas few durability and thermal analyses were carried out. Moreover, few fine RA were sourced from the production waste of construction materials. Finally, there were no patents or products available on the market. The outcomes presented in this paper underlined the research trends that are useful to improve the knowledge on the suitability of fine RA from building-related processes in mortars.

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