scholarly journals GEORADARO TAIKYMAS ASFALTO DANGŲ ĮRENGIMO KOKYBEI ĮVERTINTI / EVALUATION OF THE USE OF GPR IN QUALITY CONTROL OF ASPHALT PAVEMENT LAYERS

2018 ◽  
Vol 10 (0) ◽  
pp. 1-5
Author(s):  
Andrius Baltrušaitis ◽  
Audrius Vaitkus
Keyword(s):  
Ground Penetrating Radar ◽  
New Technologies ◽  
Asphalt Pavement ◽  
Rapid Development ◽  
Road Surface ◽  
Air Voids ◽  
The Road ◽  
Pavement Layers ◽  
Ground Penetrating

The optimum density and air-voids content of asphalt pavement layers are among the main indicators of the durability of asphalt road pavement. The asphalt pavement with insufficient density is less resistant to traffic loading and the damaging effects caused by water. Air-voids ensure the durability of asphalt pavement and the accumulation of free bitumen during a period of hot weather. At present, the main ways to control the quality of compaction and the content of air-voids is to drill core specimens and test them in the laboratory. This method is expensive, it damages the road surface, and the quality of asphalt pavement is verified only at several points. With the rapid development of new technologies, it is necessary to evaluate and to apply innovative non-destructive methods, allowing us to determine the qualitative characteristics of asphalt pavement across the entire length of the road without causing the damage to the road surface and at lower costs. This article describes the use of Ground Penetrating Radar to determine asphalt pavement density and air-voids content provides an overview of global practices and feasibility analysis on the application of Ground Penetrating Radar on the roads of Lithuanian. Santrauka Asfalto dangos sluoksnių optimalus tankis ir oro tuštymių kiekis yra vieni iš pagrindinių dangos ilgaamžiškumo rodiklių. Nepakankamo tankio danga yra mažiau atspari automobilių eismo apkrovoms ir žalingam vandens poveikiui. Oro tuštymės užtikrina dangos ilgaamžiškumą ir laisvojo bitumo akumuliavimą karštuoju metų laikotarpiu. Šiuo metu pagrindinis būdas kontroliuoti sutankinimą ir oro tuštymių kiekį yra gręžti kernus ir juos bandyti laboratorijoje. Šis metodas yra brangus, gadinama kelio danga ir asfalto dangos kokybė patikrinama tik keliuose taškuose. Sparčiai vystantis technologijoms būtina įvertinti ir taikyti inovatyvius neardančiuosius metodus, leidžiančius kokybinius asfalto dangos rodiklius nustatyti neardant dangos, išilgai viso kelio ir mažesnėmis sąnaudomis. Šiame straipsnyje pateikta georadaro (angl. Ground Penetrating Radar) taikymo asfalto dangai sutankinti ir oro tuštymių kiekiui nustatyti pasaulinės praktikos apžvalga ir panaudojimo Lietuvos automobilių keliuose galimybių analizė.

scholarly journals Lidar and ground penetrating radar data in determining road surface conditions and geological characteristics of unstable soils

2017 ◽  
Vol 2 (20) ◽  
pp. 111-129
Author(s):  
Artur Plichta ◽  
Adam Piasecki
Keyword(s):  
Ground Penetrating Radar ◽  
Load Capacity ◽  
Radar Data ◽  
Road Surface ◽  
The Road ◽  
Geological Characteristics ◽  
Laser Scanners ◽  
Road Projects ◽  
The Stability ◽  
Ground Penetrating

Within the road investments the very important element determining repeatedly the success of the whole project is an adequate information about the characteristics of the site, its load capacity, stability and the possible impact of geological characteristics that may interfere with subsequent service life, not only for the road surface itself, but also for the surrounded objects. The surface is incessantly influenced by geological characteristics, determining its durability and functional usefulness. The main aim of this paper is to answer the question how by the usage of modern technics for obtaining data it is possible to find a link confirming the characteristics of land on which the specific road projects are supposed to be carried out, or where these projects have already been accomplished, concerning their requirements with high accuracy of location and also the stability and durability of the ground. This article makes also an attempt to answer not only the question how to identify the construction of road surface, but also how to locate underground cavities, created or influenced by the flow of water, or due to geological structures characterized as an inconsistent ground. The results were supported with geophysical researches using GPR method, and also data collected with laser scanners.

The Failure Reasons and Testing Methods of the Asphalt Pavement

2014 ◽  
Vol 1030-1032 ◽  
pp. 1120-1122
Author(s):  
Peng Fei Li ◽  
Jing Hui Liu ◽  
De Xin Lei ◽  
Zhi Zhong Li
Keyword(s):  
Asphalt Pavement ◽  
Rapid Development ◽  
Road Construction ◽  
Construction Process ◽  
The Road ◽  
Natural Factors ◽  
Road Load ◽  
Country Road ◽  
Pavement Damage

With the rapid development of our economy, also promotes the development of our country road. Though the road construction starts relatively late in our country, but its development is very quick. However, due to the technology is not very mature, and the road load is bigger, and the influence of climate and so on, makes appeared different degree of damage of asphalt pavement. So how to improve the quality of the road is also became a problem to be solved in engineering. This article mainly from the problems existing in the construction process, the influence of natural factors and human factors, analyses the reason of pavement damage, and how to detect damage of asphalt pavement.

scholarly journals AN EXAMPLE OF COMPLIANCE VERIFICATION OF PAVEMENT PROJECT SPECIFICATIONS BY MEANS OF GEOPHYSICS

2018 ◽  
Vol 36 (1) ◽  
pp. 33
Author(s):  
Carolina Narjara Mazzini Amaral ◽  
Lúcia Maria da Costa e Silva
Keyword(s):  
Layer Thickness ◽  
Ground Penetrating Radar ◽  
Asphalt Pavement ◽  
Construction Project ◽  
Geophysical Method ◽  
Compliance Verification ◽  
Pavement Layers ◽  
Paved Road ◽  
Ground Penetrating ◽  
Non Destructive

ABSTRACT. The most important information about asphalt pavement is layer thickness. This information indicates whether or not the project specifications were met, and can also direct future recovery plans. Verifying these data relies on destructive techniques, such as boreholes, which may be expensive or even render verification unfeasible. Using the electromagnetic geophysical method known as ground penetrating radar (GPR), it is possible to verify compliance with pavement project specifications in an efficient and non-destructive way. We present an example of the use of GPR for this purpose obtained on a paved road at the campus of the Universidade Federal do Pará (UFPA), in Brazil. The GPR survey enabled individual pavement layers be identified. The comparison of the thickness of these layers, and those found in a borehole drilled during the GPR survey, with the thickness specified by the construction project plans, showed significant discrepancies. Keywords: ground penetrating radar, GPR, asphalt layer thickness. RESUMO. As informações mais importantes sobre o pavimento asfáltico são a espessura de suas camadas. Estas quantidades indicam se as especificações do projeto foram atendidas e podem também direcionar planos futuros de recuperação. A verificação desses dados depende de técnicas destrutivas, tais como perfurações, que podem encarecê-la ou até torná-la inviável. Com o método geofísico GPR é possível verificar o cumprimento das especificações de projeto de pavimentação asfáltica de maneira eficiente e não destrutiva. Apresentamos um exemplo obtido em uma estrada pavimentada no campus da Universidade Federal do Pará (UFPA, Brasil) que permitiu a identificação das camadas do pavimento com o GPR. A comparação dessas espessuras e daquelas obtidas por meio de um furo perfurado durante o levantamento GPR com as espessuras especificadas pelo projeto de construção mostram discrepâncias significativas. Palavras-chave: radar de penetração do solo, GPR, espessura de pavimentação asfáltica.

scholarly journals Asphalt Layer Density and Air Voids Content: GPR and Laboratory Testing Data Reliance

2020 ◽  
Vol 15 (3) ◽  
pp. 93-110
Author(s):  
Andrius Baltrušaitis ◽  
Audrius Vaitkus ◽  
Juris Smirnovs
Keyword(s):  
Asphalt Pavement ◽  
Relative Dielectric Permittivity ◽  
Void Content ◽  
Air Voids ◽  
The Road ◽  
Layer Density ◽  
Road Pavement ◽  
Ground Penetrating ◽  
Air Void ◽  
Air Void Content

The assurance of asphalt pavement layer compaction, expressed by ratio between field and laboratory bulk density and air voids content, is one of the main criteria of the durability of asphalt road pavement. Destructive measures should be applied and cores should be taken from the asphalt pavement seeking to determine the representative compaction level of the constructed asphalt layers. New methods are constantly being sought for fast, non-destructive and accurate asphalt layer density and air void determination on road. Ground Penetrating Radar (GPR) can allow determining the qualitative characteristics of asphalt pavement across the entire length of the road without causing damage to the road structure. Relative dielectric permittivity, usually called dielectric value or constant, is the leading property used in GPR applications on road pavement surveys. This article presents GPR measurement results from asphalt base and binder layers of four test sections. GPR measurements were conducted immediately after the end of asphalt layer compaction process. Test points on each layer were selected and density, air void content were determined by drilling cores and testing them in the laboratory. To estimate asphalt layer density and air void content, GPR data were analysed using different existing mathematical models. To justify the reliability of the data measured by GPR, results were checked by comparing them with the results measured directly on cores taken from the asphalt pavement layers.

scholarly journals Effect of Thickness of Gravel Base and Asphalt Pavement on Road Deformation

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Dongliang He ◽  
Weijun Yang
Keyword(s):  
Numerical Calculation ◽  
Test Section ◽  
Asphalt Pavement ◽  
Road Surface ◽  
Vertical Deformation ◽  
The Road ◽  
Design Requirements ◽  
The Relationship

This study uses a test section of a highway, a study object, to explore the effect of thickness of the gravel base and asphalt layer on the vertical deformation of the road surface. The thickness of the asphalt layer and graded gravel base is changed. The nonlinear description equation of the relationship between the thickness (h1) of the asphalt layer and the vertical deformation (d1) is established: d1=a41−b4h1. The thickness of the asphalt pavement is then determined to reduce vertical deformation. Numerical calculation shows that the maximum vertical deformation of the foundation is within 8 mm, which is less than the 15 mm maximum vertical deformation of the embankment. This level meets the design requirements.

scholarly journals KARAKTERISTIK CAMPURAN AC-WC MENGGUNAKAN MATERIAL RECLAIMED ASPHALT PAVEMENT DENGAN TAMBAHAN ASPAL PEN. 60/70 YANG DISUBSTITUSI STYROFOAM

2019 ◽  
Vol 2 (2) ◽  
pp. 149-157
Author(s):  
Hendra Arianto ◽  
Sofyan M. Saleh ◽  
Renni Anggraini
Keyword(s):  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Reclaimed Asphalt Pavement ◽  
Additional Material ◽  
Reclaimed Asphalt ◽  
The Road ◽  
Concrete Type ◽  
Technical Specifications ◽  
Parameter Values

Reuse of reclaimed asphalt pavement material (RAP) is an alternative which applicated for potential enough on the roughness of the road. RAP material can be reused by adding the asphalt and the new aggregate according of the mixture composition so that it is expected will be obtained the quality as planned. One of the efforts made in improving the quality of asphalt mixture RAP material is using a modified asphalt with additional material, such as styrofoam. The use of styrofoam into the asphalt is expected to improve the technical properties of a mixture. The purpose of this research is to know the comparative characteristics of hot mix asphalt (asphalt concrete) type AC-WC that uses RAP material with additional asphalt pen. 60/70 and asphalt pen. 60/70 substitution in the styrofoam by 8%, 10% and 12% against the weight of asphalt based on levels of asphalt left on the material. The initial stages of this study is to conduct an examination of the physical properties of RAP material, then manufacturing a specimen with variations of the addition of asphalt and aggregate new levels based on the job mix diesign (JMD) Bina Marga Aceh (2013). Based on research results, parameter values marshall on all types of asphalt mixture with new aggregate as well as RAP materials and the use of 100% asphalt pen. 60/70 additional or different types of asphalt on OAC has fulfilled the technical specifications defined by the Bina Marga (2014). Best stability values obtained on asphalt mixture using RAP material with additional asphalt pen. 60/70 with 12% styrofoam substitution on OAC JMD Bina Marga Aceh, that amounted to 3,308.72 kg, the lowest value stability retrieved on asphalt mixture using a new aggregate based on the results of Department of Bina Marga Aceh on OAC i.e. of 983.94 kg.

scholarly journals Bosnia and Herzegovina market research on the use of autonomous vehicles and drones in postal traffic

2021 ◽  
Vol 1 (2) ◽  
pp. 32-37
Author(s):  
Amel Kosovac ◽  
Ermin Muharemović ◽  
Alem Čolaković ◽  
Mirza Lakaca ◽  
Edvin Šimić
Keyword(s):  
Bosnia And Herzegovina ◽  
Autonomous Vehicles ◽  
Market Research ◽  
New Technologies ◽  
Rapid Development ◽  
Constant Change ◽  
To Come ◽  
Postal Sector ◽  
Business Sectors

New technologies primarily affect the lives of all people, their habits, needs, desires, but also significantly affect the demands placed on various business sectors. Discussions on the increasingly rapid development of technical-technological solutions that can be applied in the postal sector and logistics have a long history. New technologies in all areas bring a constant change in the relationship between companies and their customers, which significantly affect the quality of work and activities. In the years to come, it will be an increasing challenge for postal operators around the world, as well as for other companies, to achieve substantive communication and understanding of their customers through the application of innovative technologies. Understanding and learning about customer issues is key to offering them services that, with their precise targeting of stakeholders, quality, visibility, efficiency, and, perhaps most importantly, flexibility, will be able to meet needs that change so quickly over time. This will be possible with new technologies and innovative solutions. The paper presents a market research on the potential use of autonomous vehicles and drones in the postal sector in Bosnia and Herzegovina. The research is based on a survey questionnaire on the use of drones and autonomous vehicles in the postal sector in the segment of shipment delivery.

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