scholarly journals Reducing the accumulation of residual deformations in the structural layers of pavements and in the subgrade soil through the use of stabilizing and adhesive additives

2018 ◽  
Vol 5 (4) ◽  
Author(s):  
Georgij Mygal ◽  
Nikita Mironov ◽  
Vakhtang Matua
Keyword(s):  
Asphalt Concrete ◽  
Soil Stabilization ◽  
Construction Materials ◽  
Road Construction ◽  
Turnaround Time ◽  
Road Pavement ◽  
Subgrade Soil ◽  
Stabilized Soil ◽  
Residual Deformations ◽  
The Impact

Road constructions are most relevant. This article provides data on the improvement of the properties of road construction materials, including those added to the soil: stabilized soil and adhesive asphalt concrete. Because of the impact of the above-mentioned additives, the accumulation of residual deformations in the structural layers of road products are reduced. The analysis of the market of the Russian Federation, which resulted in the identification of the following most preferred options for additives for research: ANT for soil stabilization and Amdor-10 and DAD-1 mark C for asphalt concrete. For asphalt concrete, several additivies were considered, since this is the most important structural layer in road pavement, perceiving the load from passing vehicles. This article provides comparative tables and graphs, which provide data on changes in the physic-mechanical properties of materials (soils and asphalt concrete) as a result of the application of the above additives. All tests were performed in accordance with the current regulatory documentation, and all the necessary requirements for the test materials were met. Were also obtained materials for testing. With the help of this device the possibility of resisting the accumulation of residual deformations is estimated. There is an imitation of situations in which materials are in real road. As a result, data were obtained that the use of stabilizing additives for soil and adhesive fabric reduces the accumulation of residual deformations and, as a result, increases the turnaround time between repairs.

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.

scholarly journals Pengaruh Penambahan Limbah Plastik Jenis Thermosetting Terhadap Parameter Marshall Laston AC-WC

2019 ◽  
Vol 24 (2) ◽  
pp. 166
Author(s):  
Kusdiyono Kusdiyono ◽  
Supriyadi Supriyadi ◽  
Tedjo Mulyono ◽  
Sukoyo Sukoyo
Keyword(s):  
Asphalt Concrete ◽  
Plastic Waste ◽  
Concrete Mixture ◽  
Partial Replacement ◽  
Short Term ◽  
Road Pavement ◽  
Long Run ◽  
Plastic Bag ◽  
Marshall Stability ◽  
The Impact

At present, plastic is a material that is needed by the community at large, where the impact is also very extraordinary after the plastic is used in everyday life which can cause serious problems if the management is not done properly. The problem of plastic waste does not only occur in the city of Semarang, but also in other cities, so that the Ministry of Environment and Forestry has implemented a paid plastic bag program in the short term. But this is only to deal with problems in the short term. In the long run, it will not solve the problem of "plastic waste", because the policy actually encourages people to buy plastic which, of course, will add a new burden for the community to buy it. Based on the above problems, it is necessary to utilize this plastic waste to be made into road pavement materials such as in the manufacture of Asphal Concrette Wearing Course, by making 5 mixed variations ranging from (2 to 10)% of the weight of the aggregate . This research was initiated through a survey process, material procurement, testing of stacking materials, making test specimens, testing specimens. The results of the research can show that the type of Thermosetting plastic waste has a significant influence on the Asphalt Concrete mixture AC-WC heat mixture, including: Density, Marshall Stability, Flow, VIM, VMA, MQ and the remaining Marshall Stability tend to show an increase, moderate VFA and VIMrefusal Density values tend to show a decrease. Thus the plastic waste from the Thermosetting type can be used as a partial replacement of the aggregate for the Asphalt Concrete mixture AC-WC heat mixture with a plastic waste content is limited to a maximum of 10% and at an optimum asphalt content of 5.55%. Thus this research is expected to be of benefit to the industry and the people of Semarang in relation to the use of plastic waste for road pavement.

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 Use of slag (with cement) for improving the performance of expansive soil of road pavement subgrade

2019 ◽  
Vol 276 ◽  
pp. 05002
Author(s):  
Agus Ika Putra ◽  
Mohamed A. Shahin
Keyword(s):  
Unconfined Compressive Strength ◽  
Laboratory Tests ◽  
Expansive Soil ◽  
Curing Time ◽  
Road Pavement ◽  
Subgrade Soil ◽  
Stabilized Soil ◽  
Repeated Load ◽  
Repeated Load Triaxial ◽  
Selection Of

The study presented in this paper evaluates the suitability of using slag (with cement) as a stabilizer, for improving the performance of expansive subgrade soil in road pavement. Several laboratory tests were conducted to determine the geotechnical engineering characteristics of the expansive soil and associated mechanical engineering performance. The tests conducted include the particle size distribution, standard Proctor compaction, Atterberg’s limits, free swelling, permeability, California bearing ratio (CBR), unconfined compressive strength (UCS), and repeated load triaxial (RLT). In this study, the use of slag (with cement) as a stabilizer followed three proportion schemes, and the selection of a specific stabilizer proportion was determined based on UCS value that satisfies the required standard as a subgrade for road pavement. The results recommended a stabilizer proportion for the soil studied to be 13.5% slag + 1.5% cement at 28 days curing time. This mixture resulted in a remarkable increase in the UCS value of eight times higher than the UCS value of the non-stabilized soil. The CBR value of the mixture was four times higher than the minimum required value for design of road pavement. The study presented herein confirmed that the exploitation of the by-product material of slag can indeed be useful, both in terms of improving the performance of the subgrade soil for road pavement and sparing the environment a spread of significant potential pollutant.

Experimental Research Detailed Indicators of Cement-Stabilized Soil Combined Evocrete ST Additive

2020 ◽  
pp. 58-67
Author(s):  
Ван Лонг Нгуен ◽  
Ф. В. Матвиенко ◽  
Ким Тан Хуинь
Keyword(s):  
Construction Materials ◽  
Road Construction ◽  
Road Transport ◽  
Transport Infrastructure ◽  
Study Results ◽  
The World ◽  
Stabilized Soil ◽  
Pavement Construction ◽  
Intensive Development ◽  
Different Levels

Постановка задачи. В условиях интенсивного развития мировой дорожно-транспортной инфраструктуры в настоящее время наблюдается дефицит качественных дорожно-строительных материалов. Одним из основных способов решения этой проблемы является применение грунтов, укрепленных неорганическими вяжущими веществами для сооружения конструктивных слоев дорожной одежды. Результаты. Приведен краткий теоретический обзор результатов исследований возможности применения грунтов, укрепленных неорганическими вяжущими веществами и цементом совместно с различными добавками, для сооружения конструктивных слоев дорожной одежды. Приведены результаты экспериментальных исследований основных прочностных показателей грунтов, укрепленных цементом с различным содержанием добавки Evocrete ST. Выводы. Установлен значительный положительный эффект от применения добавки Evocrete ST в количестве 3-5 % от массы цемента для укрепления исследуемых грунтов в комплексе с цементом. Предложено применить исследуемые грунты, укрепленные добавкой Evocrete ST совместно с цементом, для сооружения конструктивных слоев дорожной одежды автомобильных дорог различных категорий. Statement of the problem. Under the conditions of intensive development of the world road transport infrastructure, there is currently a shortage of high-quality road construction materials. One of the key solutions to address this problem is to use stabilized soil with inorganic binder to make the pavement construction. Results. The paper presents an overview of the study results in evaluating the ability to use stabilized soil with inorganic binders, and other inorganic adhesives combinations for pavement construction. The study also shows the different levels of indicators of cement-stabilized soil combined Evocrete ST additive. Conclusions. It can be seen that the effectiveness of using Evocrete ST additive with a content of 3-5 % combining cement to stabilize the soil. The study proposes to use cement-stabilized soil combined Evocrete ST additive to make different type of pavement constructions.

Study of the influence of the efficiency of application of asphalt concrete reinforced by basaltic fiber

2021 ◽  
Vol 2021 ◽  
pp. 117-128
Author(s):  
Artur Onyshchenko ◽  
◽  
Mykola Garkusha ◽  
Oleksandr Fedorenko ◽  
Yevgen Plazii ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Asphalt Concrete ◽  
Materials Science ◽  
Shape Change ◽  
Construction Materials ◽  
Basalt Fiber ◽  
Physical And Mechanical Properties ◽  
Operating Conditions ◽  
Concrete Mix ◽  
The Impact

Introduction. Increasing the load on highways and constantly increasing the intensity of traffic requires the use of road construction materials with improved physical and mechanical properties. Asphalt concrete is one of the most common and effective materials, which allows to provide the necessary strength and durability of the pavement structure. However, the use of traditional materials for its preparation - mineral material and road bitumen has a limited resource, which does not always meet traffic conditions. Modern scientific research in materials science allows to use mixtures of asphalt concrete and asphalt concrete road with the use of basalt fiber.Apply mixtures of asphalt concrete and asphalt concrete road with the use of basalt fiber, allows to increase the mechanical characteristics - tensile strength and resistance to fatigue from repeated loads, which increases the crack resistance of asphalt concrete layers of pavement structures, as well as increases resistance to shape change. accumulation of residual deformations.Problem Statement. From the literature analysis it is established that the coating of non-rigid pavement is in difficult operating conditions, which is confirmed by the intensive growth of defects in the form of tracks, landslides, inflows, cracks, due to increasing parameters of transport loads and high summer temperatures, so there is a need new materials.Purpose. Is to study the impact of the effectiveness of asphalt concrete reinforced with basalt fiber.Results. The results of physical and mechanical properties of asphalt concretes with the use of basalt fiber are obtained. The results of formation of residual deformations in the form of track in asphalt concrete with the use of basalt fiber are obtained. As a result of the conducted researches the analysis of efficiency of application of basalt fiber in asphalt concrete mix is executed.On the basis of the carried-out researches the basic requirements to asphalt concrete mix with use of basalt fiber are establishedConclusions. The research results were used in the development of regulations for the design, construction and repair of asphalt layers of roads in Ukraine.Keywords: asphalt concrete road with basalt fiber, asphalt concrete mixes with basalt fiber, loading, covering, stability, temperature.

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.

scholarly journals Using Waste Asphalt Concrete (WAC) for Improving Poorly sandy Graded (PSG) Subgrade Soil

2018 ◽  
Vol 7 (4.20) ◽  
pp. 472 ◽  
Author(s):  
Asst. Prof. Dr. Khawla H. H. Shubber ◽  
Eng. Ali S. M. Alkizwini
Keyword(s):  
Water Content ◽  
Asphalt Concrete ◽  
Dry Density ◽  
Ratio Test ◽  
Direct Shear ◽  
Angle Of Internal Friction ◽  
Subgrade Soil ◽  
Optimum Water Content ◽  
Stabilized Soil ◽  
Optimum Water

Waste asphalt concrete (WAC) is one of main current sustainable problems facing accumulation in high quantities as a result of the highways failure, maintenance and reconstructions. On the other hand, presence of large amounts of poorly sand graded (PSG) soil near rivers, which are not suitable in case of using it as subgrade soil. So, present research focusing on study the effect of adding WAC on the properties of PSG soil. Modified Procter test, California Bearing Ratio test (CBR), Direct Shear test were depend on evaluating the stabilized soil properties (i.e. dry density, optimum water content, CBR, and direct shear).  PSG river soil used as subgrade soil in this research brought from sides of Sadit AL- Handayi in Babylon Governorate located in middle west of Iraq, about 60 km south west of Baghdad, capital of Iraq. Percent of adding are (12, 24, 36, and 48)% by weight. Results showed that the adding of WAC increase the dry density in different rate. While the optimum water content decrease with increasing WAC added. Direct shear of stabilized soil increase while angle of internal friction decrease with increasing of added WAC. CBR values increase with increasing WAC added.  

Impact of subgrade soils on pavement roughness

2016 ◽  
Vol 53 (4) ◽  
pp. 687-695
Author(s):  
Michel Vaillancourt ◽  
Daniel Perraton
Keyword(s):  
Road Construction ◽  
Soil Variability ◽  
International Roughness Index ◽  
Long Wavelength ◽  
The Road ◽  
Subgrade Soils ◽  
Road Section ◽  
Pavement Roughness ◽  
Subgrade Soil ◽  
The Impact

To highlight the impact of subgrade soil variability on the pseudo-profile and roughness at the end of road construction, a research program has been carried out at the Laboratoire sur les chaussées et matériaux bitumineux at École de technologie supérieure (ÉTS). The analysis is intended to highlight the variability of materials’ characteristics according to the longitudinal and vertical axes of the road. The proposed approach aims to calculate potential settlement variations through a global numerical simulation of a road section, in a bid to identify the expected pseudo-profile and to quantify the roughness quality by calculating the international roughness index (IRI). The proposed methodology was tested at a new road construction project in Québec. Here, the results of the simulations are compared to the details of the actual pseudo-profile obtained at the end of road construction for the project under study. It is shown, through the finite difference modeling of the mechanical behavior of the subgrade soil (FLAC calculation code), that the long wavelength pseudo-profile of the road at the end of construction can be determined, and that it is strongly influenced by subgrade soil variability. This article presents a second analysis carried out by Vaillancourt and Perraton in 2015 as part of a study of the impact of subgrade soils on pavement roughness.

scholarly journals Stabilization of Lateritic Soil Admixed with Maize Husk Ash

2018 ◽  
Vol 1 (March 2018) ◽  
Author(s):  
J.R Oluremi ◽  
K.O Fagbenro ◽  
O.M Osuolale ◽  
A.M Olawale
Keyword(s):  
Construction Materials ◽  
Particle Size Analysis ◽  
Liquid Limit ◽  
Soil Samples ◽  
Grain Size Analysis ◽  
Lateritic Soil ◽  
Size Analysis ◽  
Unconfined Compression Test ◽  
Road Pavement ◽  
Stabilized Soil

Lateritic soil is one of the major construction materials in road pavement. However, obtaining lateritic soil with sufficient strength is difficult, which may necessitate its improvement by stabilization. Lateritic soil, in this study, was stabilized with upto 12% Maize Husk Ash (MHA) by weight of soil samples, with a view of improving its geotechnical properties and assessing it as subbase materials. Classification tests (particle size analysis, specific gravity, Atterbergs limits) and strength index tests (compaction, california bearing ratio (CBR), unconfined compression test (UCS) were performed on both the natural and the MHA-stabilized soil samples. The grain size analysis shows that the percentage passing No. 200 BS sieve was 47.7% for the natural lateritic soil and between 50 and 62.1% for MHA stabilized lateritic soil. The liquid limit, plastic limit and plasticity index are in the range of 61 to 76%, 28 to 53% and 16 to 37% respectively. Also, the maximum dry densities increased, while the optimum water content decreased with increase in the MHA content. The CBR value of the lateritic soil increased with MHA content up till 6% addition of MHA and thereafter decreased, while higher UCS value was obtained up till 3% and then decreased with increasing content of MHA. The results indicated that the MHA stabilized lateritic soil could only be used as subgrade and fill materials.

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