scholarly journals Actualization of innovative technologies in road construction

2019 ◽  
Vol 6 (3) ◽  
Author(s):  
Kabanov Aleksandr ◽  
Irina Kolos ◽  
Viktoriya Chernyaeva ◽  
Aleksey Ilin ◽  
Olga Medvedeva ◽  
...  
Keyword(s):  
Economic Efficiency ◽  
Asphalt Concrete ◽  
Mechanical Performance ◽  
Road Construction ◽  
Turnaround Time ◽  
Operational Parameters ◽  
The Road ◽  
Fine Grained ◽  
Concrete Mix ◽  
The Cost

This article discusses the problems that arise in the operation of road structures. One of the most important is rutting. Indicators of resistance to rutting depend on the method of design of non-rigid pavement and operational parameters, which allows to obtain the applied method of volumetric design of asphalt mix «Superpave» (SP-19), which in our country was called «SPAS». The authors, together with the staff of the laboratory of asphalt Concrete plant – 1, monitored asphalt concrete mixtures designed according to the «Superpave» system on the asphalt mixing plant. Then tests were carried out according to the method of PNST 181-2016 on the susceptibility of asphalt concrete materials to shear deformations arising under the action of repeated passes of the loaded wheel at ambient temperature. The result of the study of rutting showed that the mixture SP-19 have predominantly traditional. More detailed research results are presented in this article. Based on the data obtained from the results, conclusions were formulated: the Studies show that the method of «Superpeyv» is updated to the requirements of technical supervision at the objects of the road complex of the Russian Federation. In conclusion, the authors have formulated conclusions on the research: a comparison of physical and mechanical performance of asphalt concrete mix SP-19 on PNST 114 and fine-grained asphalt concrete mix type A brand I shows that the shear stability in terms of the average depth of the track is higher for the brand SP-19 by 38 %; set the required mixing temperature and compaction of asphalt concrete mixture on the system «Superpeyv»; the release of a pilot batch of asphalt concrete mix of SP-19 brand at the production site of JSC «ABZ-1» showed that the recipe selected in the laboratory is reproduced in the ABZ; cores selected within the framework of technical supervision from the experimental coating and tested in the laboratory showed corresponding to the requirements of ODM 218.4.038-2017; assessment of economic efficiency at the cost of asphalt concrete mix of SP-19 brand showed a decrease of 2.2 % relative to the cost of fine-grained asphalt concrete mix; the increase in the service life of the road surface h 30–50 % by reducing rutting increases its turnaround time. At the same time, economic efficiency can reach 50 % per m2.

scholarly journals Penyebab Terjadinya Justifikasi Teknis Pada Pekerjaan Jalan Di Sumatera Barat

2017 ◽  
pp. 91
Author(s):  
Eva Rita
Keyword(s):  
Road Construction ◽  
Turnaround Time ◽  
Public Works ◽  
The Road ◽  
West Sumatra ◽  
Directorate General ◽  
State And Local ◽  
Evaluative Research ◽  
The Cost ◽  
National Road

In development and reconstruction of roads frequent changes work items, affecting the cost, turnaround time and quality of work. In order to determine what factors cause of the technical justification has conducted a study of eight packages of road construction and eight packages of reconstruction road capacity of West Sumatra in the unit Implementation of National Road Region I and Region II under  theNational Road Agency of West Sumatera Province. The work packages studied wasthe work conducted in 2009 to 2015. The method used was descriptive-evaluative research. Results of the study found the 7 causal factors do technical justification that the initial design of the contract is not in accordance with the results of the engineering field, not taking into account the design life of the road, , has not been calculated in detail the volume and the price for each item of work, do not pay attention to Standard Directorate general of Highways Ministry of public Works, the land is not available when the project is implemented, the results of field surveys for planning is not complete, and the occurrence of overlapping projects between the state and local budgets. To eliminate the occurrence of increased costs due to technical justification is necessary to complete the field survey by calculating in detail the volume and the price for each work item.

scholarly journals The device layers and transport facilities of hemihydrate phosphogypsum (waste byproduct of the production of nitrogen-phosphorus fertilizers)

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Andrey Kochetkov ◽  
Natal’ya Shchegoleva ◽  
Sergey Korotkovskiy ◽  
Victor Talalai ◽  
Yury Vasilyev ◽  
...  
Keyword(s):  
Raw Materials ◽  
Road Construction ◽  
Turnaround Time ◽  
Tracked Vehicles ◽  
The Road ◽  
The Cost ◽  
Cost Of Construction ◽  
Phosphogypsum Waste ◽  
Nitrogen Phosphorus

The implementation of the proposed innovative project on the use of phosphogypsum waste in road construction will: solve the problem of recycling and processing of phosphogypsum by using it as a local by-material for the construction of roadbed and foundations of roads; replace natural gypsum with cheaper raw materials for cement, construction and road industry; reduce the cost of construction of roads and extend the turnaround time by improving the quality of their properties. Road with the use of phosphogypsum is cheaper by 30 % than roads with traditional technologies. In the swampy area due to the characteristics of the material, combining solidity and lightness, phosphogypsum is not interchangeable at all. It allows you to make reliable and durable roads. The design is obtained up to five times stronger than the required standards. At the same time, at the first stage of construction of the road, it is possible to make an intermediate type, making the bases of phosphogypsum, and later laying the remaining structural layers of crushed stone and asphalt. In this case, the coating of technical gypsum is not destroyed, even with the passage of heavy tracked vehicles and at low temperatures.

EFFECTS OF AN ENZYME ON THE PERFORMANCE OF SUBGRADES

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Daniela Ionescu ◽  
Joe Petrolito
Keyword(s):  
Fly Ash ◽  
Road Construction ◽  
Deformation Characteristics ◽  
Rural Roads ◽  
Stabilizing Agents ◽  
The Road ◽  
Fine Grained ◽  
The Cost ◽  
The Impact

An efficient transportation system requires a good network of roads provided with pavements that can withstand both the heavy and frequent traffic demands and environment variations while requiring minimal maintenance. However, roads are sometimes built where the sub-grade soil does not comply with the specifications and needs to be replaced with an acceptable soil that satisfies these requirements. To minimize the construction cost and the impact on the environment that the road construction would have, stabilizing agents (lime, cement or fly ash), are commonly used to improve the characteristics of in-situ soils. However, this process adds to the cost of road construction and maintenance. Therefore, alternative, environmental-friendly solutions have been investigated to reduce these costs. In recent years, enzymes have been used successfully to stabilize mostly fine-grained soils. This paper reports on an on-going research program on the use of various stabilizing agents to improve the properties of in-situ sub-grades for rural roads. Two locally-sourced soils were used in this investigation. The effects of cement, cement-fly ash mix and Perma-zyme binders on the properties of the selected soils were investigated. A series of tests was performed to establish the strength, stress-strain and deformation characteristics of the supplied soils. The results were compared to establish if Perma-zyme is suitable as stabilizing agent for the supplied soils.

scholarly journals The effect of shale mineral powder on the strength of asphalt concrete

2021 ◽  
Vol 264 ◽  
pp. 02052
Author(s):  
Shuxrat Buriyev ◽  
Shoxrux Davranov ◽  
Yokub Kuchkarov ◽  
Iroda Saydakberova
Keyword(s):  
Water Absorption ◽  
Asphalt Concrete ◽  
Mechanical Performance ◽  
Raw Materials ◽  
Absorption Index ◽  
Concrete Mixture ◽  
The Road ◽  
Fine Grained ◽  
Asphalt Mix ◽  
Mineral Powder

In the article, work has been done to obtain shale mineral powder based on local raw materials and develop technologies to improve the physical and mechanical performance and durability of asphalt concrete, thereby increasing the physico-mechanical performance and durability of asphalt concrete, the density of fine-grained hot dense asphalt mix with shale mineral powder. The water absorption index of the asphalt concrete mixture decreases, the strength increases, and the transport performance of the road improves.

Review of recent developments on improvement of estimated regulatory documentation for road works

2021 ◽  
Vol 2021 (23) ◽  
pp. 31-42
Author(s):  
Anatolii Tsynka ◽  
◽  
Andrii Hrinchuk ◽  
Ivan Rakovych ◽  
◽  
...  
Keyword(s):  
Work Performance ◽  
New Technologies ◽  
Operation Time ◽  
Road Construction ◽  
Labor Costs ◽  
The Road ◽  
Regulatory Documents ◽  
Road Work ◽  
Investment Process ◽  
The Cost

Introduction. In the modern conditions of the pricing system in the construction of Ukraine, the key value have the estimated norms, which are presented in separate collections, the main purpose of which is to determine the standard quantity of resources required to perform a particular type of work as a basis for the transition to the cost indicators. In order to determine the cost of road work objectively and accurately, it is essential that the indicators of estimated norms meet the requirements of regulatory documents and modern methods of execution of road works.Problematics. In connection with the active improvement of the regulatory base of the road construction industry, permanent upgrade of road organizations technique fleet, the introduction of new technologies and materials in construction and operation of roads, improving the methods of work there is a discrepancy between the existing resource element of estimated norms and the actual conditions of work in terms of built-up labor costs, the operation time of machines and mechanisms and the range of materials. Accordingly, it affects the reliability and accuracy of determining the cost of road works.Purpose. Improvement and harmonization with actual working conditions and requirements of regulatory documents of industry regulatory and estimate base of resource elementary estimated norms for work performed during construction, reconstruction, repair and operational maintenance of roads and bridges to ensure reliable and valid technical, economic and estimated calculations.Materials and methods. During work performance the analysis of the regulatory documentation, establishing the requirements to the technology of road works and materials has been carried out. A number of chronometric observations with the measurement of time of road works in full-scale conditions was carried out. The obtained data were summarized, averaged and on their basis the indicators of the resource element of the estimated norms were estimated.Results. A review of the main amendments and additions, which came into force after the approval of Amendment No 2 SOU 42.1-37641918-035:2018 [1] and Amendment No 2 SOU 42.1-37641918-071:2018 [2], which were developed to improve the regulatory-estimate base for the calculation of road works, taking into account the requirements and provisions of existing regulatory documents taking into account the current state of scientific and technological progress in the road sector.Conclusions. The above analysis of the amendments that came into force with the approval of [1]. and [2] will systematize the innovations provided by the requirements of current regulatory documents on the calculation of the cost of road works and the development of relevant documents at all stages of the investment process, planning and organization of road works, as well as the writing-off of material resources. Review and systematization of recent improvements in the estimated regulatory documents for road works will provide an opportunity to optimally plan the use of available material, labor and financial resources, often limited.Keywords: public road, operational maintenance, investment documentation, overhaul and current repairs, machine, mechanism, regulatory document, resource element estimate norm, Standard of Organization of Ukraine.

scholarly journals Recommendations for determining the thickness of the road pavement of technological roads built from coal-bearing rocks

2019 ◽  
Vol 134 ◽  
pp. 01013
Author(s):  
Victor A. Shalamanov ◽  
Sergey N. Shabaev ◽  
Faruz Alama
Keyword(s):  
Asphalt Concrete ◽  
Open Pit ◽  
Open Pit Mining ◽  
Coal Production ◽  
Mining Method ◽  
Cement Concrete ◽  
Mining Company ◽  
The Road ◽  
Road Pavement ◽  
The Cost

With open-pit mining method in Kuzbass is widely used automobile transport, transportation costs up to 70% of the cost of coal production. It is not economically feasible to use asphalt concrete and cement concrete as a material of temporary technological roads, and the use of crushed coal-bearing rocks will make it possible to increase the efficiency of coal mining by open method. Currently, the question of the application of the coal-bearing rocks for building temporary technological roads is poorly studied. The paper proposes a method of determining the thickness of road pavements of technological roads, which can be applied directly by the mining company, their analysis has been carried out, the dependence from the strength factor and the category of blockiness of foundation rocks has been determined.

scholarly journals Optimization of the organization of the forest road construction 

2019 ◽  
Author(s):  
А.Х. Мохамед ◽  
Н.А. Тюрин
Keyword(s):  
Operating Cost ◽  
Road Construction ◽  
Construction Sites ◽  
Forest Road ◽  
The Road ◽  
Construction Companies ◽  
The Earth ◽  
Machine Group ◽  
The Cost ◽  
Forest Road Construction

Основной целью работы является оптимизация использования машин для земляных работ в строительстве лесных дорог по критерию минимума приведенных расходов, путем оптимального распределения комплектов машин по объектам строительства при условии возможности аренды какихлибо дополнительных машин. Создана экономикоматематическая модель расчета эффективной структуры парка машин с точки зрения системы производственной эксплуатации, которая складывается из эффектов всех специализированных комплектов машин и эффекта от передачи машин парка в аренду. Учет возможности передачи или получения техники в аренду позволяет улучшить техникоэкономические показатели эксплуатации парка машин. Результаты работы могут быть востребованы лесозаготовительными и дорожностроительными предприятиями в период проектирования производства земляных работ, обновления машинных парков, а также при выборе наилучшего варианта использования имеющегося парка, прогнозирования продолжительности и стоимости ведения механизированных работ. The main purpose of this work is to optimize the earthmoving machinery utilization in the forest road construction, by minimize the operating cost. That goal may achieve by the optimal distribution of the machine combination in the construction sites, with the ability of renting additional machines. Economical mathematical model has been developed for calculating the effective structure of the machine group to achieve the required productivity. The possibility of hire and rent machines allows the manager to improve the technical economic decision for the machines operation. By using the developed model it can gives good results to having better decisions for planning and designing the earth working operations in the road construction companies, renovation of the machine parks, as well as the choosing the best option for using the existing machine combination, predicting the duration and predicting the cost of the whole work.

scholarly journals Road network optimization using heuristic and linear programming

2010 ◽  
Vol 56 (No. 3) ◽  
pp. 137-145 ◽  
Author(s):  
R. Ghaffariyan M ◽  
K. Stampfer ◽  
J. Sessions ◽  
T. Durston ◽  
CH. Kanzian ◽  
...  
Keyword(s):  
Network Analysis ◽  
Optimal Solution ◽  
Road Construction ◽  
Mixed Integer ◽  
Shortest Path Algorithm ◽  
Road Density ◽  
The Road ◽  
Constant Cost ◽  
The Cost ◽  
Installation Cost

&nbsp;To minimize the cost of logging, it is necessary to optimize the road density. The aim of this study was to determine optimal road spacing (ORS) in Northern Austria. The stepwise regression method was used in modelling. The production rate of tower yarder was 10.4 m<SUP>3</SUP>/PSHo (Productive system hours) and cost of 19.71 €.m<SUP>–3</SUP>. ORS was studied by calculating road construction cost, installation cost and yarding cost per m<SUP>3</SUP> for different road spacing. The minimum total cost occurred at 39.15 €.m<SUP>–3</SUP> and ORS would be 474 m assuming uphill and downhill yarding. The optimal road density and yarding distance are 21.1 m.ha<SUP>–1</SUP> and 90 m, respectively. A sample logging area was used to plan different roads and, using network analysis, the best solution was found based on a modified shortest path algorithm. The network analysis results were very different from the optimal road spacing results that assumed roads and logging corridors could be located anywhere in the planning area at a constant cost. Mixed integer programming was also used to get a real optimal solution.

scholarly journals Extending the Service Life of Pavements

2018 ◽  
Vol 26 (1) ◽  
pp. 25-32
Author(s):  
Ivan Gschwendt
Keyword(s):  
Asphalt Concrete ◽  
Building Materials ◽  
Road Construction ◽  
Pavement Management ◽  
High Modulus ◽  
Pavement Management System ◽  
Asphalt Mix ◽  
Degradation Models ◽  
The Cost ◽  
Whole Life Cost

Abstract The cost of road construction and expenditures on the maintenance of pavements, i.e., their whole life cost, represents a lot of money. The paper describes a procedure for a pavement management system with degradation models and estimates the length of time for the rehabilitation of an asphalt pavement. Using a theory of pavement mechanics, we calculated the stresses and strains on the layers of two pavement models. High modulus asphalt concrete, an asphalt mix with a high binder content, and an asphalt mix with binder modifications are new road building materials. Prolonging the time for the rehabilitation of pavements is possible.

Features of the Technology of Construction of Road Pavements from Vacuum-Treated Asphalt Concrete Mix

2020 ◽  
Vol 785 (10) ◽  
pp. 31-37
Author(s):  
S.V. NOSOV ◽  
◽  
B.A. BONDAREV ◽  
I.S. NOSOV ◽  
◽  
...  
Keyword(s):  
Rheological Properties ◽  
Asphalt Concrete ◽  
Frost Resistance ◽  
Construction Materials ◽  
Road Construction ◽  
Rheological Parameters ◽  
Roller Compaction ◽  
Technological Parameters ◽  
Road Asphalt ◽  
Concrete Mix

When changing the structural properties of road construction materials, their compaction technologies should be improved with the choice of the best compaction means and their technological modes of operation in specific conditions of work conduction. For a mixture evacuated at an asphalt concrete plant that has increased water and frost resistance characteristics, as well as changed rheological parameters, it is also necessary to determine the technological parameters of the compaction means used, taking into account the features of its rheological characteristics. The compaction technology of vacuum-treated hot asphalt-concrete mix by pneumatic wheel roller with the determination of the necessary number of passes on the trail, speed modes along the roller passages and the magnitude of the air pressure in the tires of the roller has been developed. Using a promising rheological approach, the dynamics of accumulation of the asphalt concrete mixture layer density along the roller passages was studied by simulation modeling, and the time when the pneumatic roller was finished and the compaction work was transferred to heavy smooth rollers was determined. Changing the rheological properties of the vacuum-treated asphalt mix increases the efficiency of its compaction, reducing material costs, increasing the productivity of compaction tools while improving the quality and durability of road asphalt pavements. Keywords: hot asphalt-concrete mix, rheological properties, water and frost resistance of asphalt concrete, road roller, compaction.

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