Bio: Audrius Vaitkus is an academic researcher from Vilnius Gediminas Technical University. The author has contributed to research in topics: Asphalt & Physics. The author has an hindex of 14, co-authored 105 publications receiving 847 citations.
Papers published on a yearly basis
TL;DR: An overview of different technologies of hot mix asphalt (HMA) production, and the advantages and disadvantages of these technologies are presented in this article. But the main focus of this paper is on WMA production.
Abstract: Production of hot mix asphalt (HMA) requires high energy consumption and exhaustion of CO2 and other environment unfriendly materials. The fumes of HMA are injurious for roadmen and asphalt plant workers. The use of warm mix asphalt (WMA) allows for reducing the HMA production temperatures at which the material is mixed and laid on the road. WMA helps to reduce the working temperature of asphalt up to 30°C. This article presents an overview of different technologies of WMA production, and the advantages and disadvantages of these technologies. The laboratory research includes research of physical and mechanical properties of WMA produced with different technologies and different amounts of additives for temperature lowering. Two different kinds of asphalt were tested in the laboratory. The chemical additives and chemical and natural zeolite were used for WMA production in the laboratory.
TL;DR: In this paper, an overview of different WMA production technologies, advantages and disadvantages of these technologies is presented, and results of experiment for selection of optimal amount of temperature lowering additives and their influence to physical mechanical characteristics of asphalt mix are presented too.
TL;DR: In this article, a large-scale laboratory testing of acoustical and mechanical performance, durability and resilience to climate were performed, which were positive and followed with the pilot implementation of developed asphalt mixtures for further research activities under real traffic and climate conditions.
TL;DR: In this paper, an advanced shear tester (AST) was proposed for testing the response of 150mm cylindrical specimens under constant normal stiffness (CNS) conditions.
Abstract: This paper presents motivation and details on the development of an advanced shear tester (AST) device capable of investigating the response of 150-mm cylindrical specimens under constant normal stiffness (CNS) conditions. Based on the laboratory experience and field observations from the soil and rock engineering, CNS conditions are particularly desirable when the normal stress changes considerably during the shearing process. Such situations occur in asphalt pavement structures especially under certain loading configurations. The CNS conditions are complementary to the constant normal load conditions that are applied in the current shear-mode devices incorporated in testing of asphalt concrete (AC) and pavement interface properties. This paper demonstrates the complex state of stress in the upper AC layer of a typical pavement under moving truck wheel and shows the need for the CNS device. In addition to outlining unique AST design features, this paper presents also the verification effort conducted on ...
01 Jan 2014
TL;DR: In this article, the authors focused on the analysis of the bitumen quality and found that using bitumen from different producers with the same physical characteristics can be significantly different in fractional composition.
Abstract: The present paper focuses on the analysis of the bitumen quality which can be a relevant issue in the performance of road surfacing. Using bitumen from different producers with the same physical characteristics can be significantly different in fractional composition. Crude oil selection and processing play an important role in bitumen properties. Changes in processing and crude sources even within a market may also lead to variability in bitumen fractional composition. The aim of this study is to determine to which extend the type of crude oil and the production technology influence the bitumen fractional composition. Bitumen samples were selected based on the origin crude oil and different producers. In order to obtain information about bitumen chemistry, IATROSCAN MK 6S chromatography was used. The results showed that recommendations of bitumen fractional composition provide a better quality of bitumen according to crude oil type and processing.
TL;DR: In this paper, an overview of the different technologies used in the manufacturing of WMA is presented, as well as the materials, additives, mix design and performance of the asphalt made by this technology.
28 Aug 2014
TL;DR: With current methods and data, environmental burden of disease estimates support meaningful policy evaluation and resource allocation, including identification of susceptible groups and targets for efficient exposure reduction.
Abstract: Background: Environmental health effects vary considerably with regard to their severity, type of disease, and duration. Integrated measures of population health, such as environmental burden of disease (EBD), are useful for setting priorities in environmental health policies and research. This review is a summary of the full Environmental Burden of Disease in European countries (EBoDE) project report. Objectives: The EBoDE project was set up to provide assessments for nine environmental risk factors relevant in selected European countries (Belgium, Finland, France, Germany, Italy, and the Netherlands). Methods: Disability-adjusted life years (DALYs) were estimated for benzene, dioxins, secondhand smoke, formaldehyde, lead, traffic noise, ozone, particulate matter (PM2.5), and radon, using primarily World Health Organization data on burden of disease, (inter)national exposure data, and epidemiological or toxicological risk estimates. Results are presented here without discounting or age-weighting. Results: About 3–7% of the annual burden of disease in the participating countries is associated with the included environmental risk factors. Airborne particulate matter (diameter ≤ 2.5 μm; PM2.5) is the leading risk factor associated with 6,000–10,000 DALYs/year and 1 million people. Secondhand smoke, traffic noise (including road, rail, and air traffic noise), and radon had overlapping estimate ranges (600–1,200 DALYs/million people). Some of the EBD estimates, especially for dioxins and formaldehyde, contain substantial uncertainties that could be only partly quantified. However, overall ranking of the estimates seems relatively robust. Conclusions: With current methods and data, environmental burden of disease estimates support meaningful policy evaluation and resource allocation, including identification of susceptible groups and targets for efficient exposure reduction. International exposure monitoring standards would enhance data quality and improve comparability. Citation: Hänninen O, Knol AB, Jantunen M, Lim TA, Conrad A, Rappolder M, Carrer P, Fanetti AC, Kim R, Buekers J, Torfs R, Iavarone I, Classen T, Hornberg C, Mekel OC, EBoDE Working Group. 2014. Environmental burden of disease in Europe: assessing nine risk factors in six countries. Environ Health Perspect 122:439–446; http://dx.doi.org/10.1289/ehp.1206154
TL;DR: In this article, the state-of-the-knowledge and state of the-art regarding polymer-modified bitumens (PmBs) are discussed. But, it can be declared that while some polymers/additives can improve one or some aspects of neat bitumen properties, they can lead to compatibility problems in storage and production.
Abstract: This synthesis explores the state-of-the-knowledge and state-of-the-practice regarding the latest updates on polymer-modified bitumens (PmBs). The information in this study was gathered from a thorough review of the latest papers in the literatures related to modified bituminous materials, technologies, and advances. For this purpose, the paper is presented in two principle sections. In the first part, the bitumen itself is investigated in terms of chemical structure and microstructural systems. In the second part, the paper focuses on bitumen modification from different aspects for assessing the effectiveness of the introduced additives and polymers for enhancing the engineering properties of bitumen in both paving and industrial applications. In conclusion, the knowledge obtained in this study has revealed the importance of the chemical composition of base bitumen for its modification. It can be declared that while some polymers/additives can improve one or some aspects of neat bitumen properties, they can lead to compatibility problems in storage and production. In this respect, several studies showed the effectiveness of waxes for improving the compatibility of polymers with bitumen in addition to some benefits regarding warm mix asphalt (WMA) production.