The dissertation was defended at the public meeting of the Dissertation Defense Council of the Scientific Field of Transport Engineering in the SRA-I Meeting Hall of Vilnius Gediminas Technical University at 10 a.m. on 26 January 2024
The relevance of the dissertation is related to the reuse of old bituminous pavement in the production of new asphalt mixtures. The aim is to provide a scientific assessment of the re-use of asphalt grains formed during the repair of an old bituminous road surface, to prepare them adequately for addition to the production of new asphalt mixtures and to produce these mixtures. The energy requirements were determined for adding used asphalt pavement to produce a new asphalt mix in the plant under the influence of moisture at different amounts of the added material. Scientific works were analysed, and numerical modelling and experimental research were performed to achieve this goal. The dissertation consists of an introduction, three chapters, general conclusions, lists of used literature and the author’s publications on the dissertation topic, a summary in English and one appendix. The introductory chapter presents the research problem, the work’s relevance, and the research object. It formulates the work’s aim and tasks and describes the research methodology, the scientific novelty of the work, the practical significance of the work results, and the defence statements. The introduction closes with publications by the author on the topic of the dissertation. The first chapter analyses the research on reusing old asphalt pavement, starting but not limited to preparation processes (milling, crushing, sieving, and storage) and the impact of preparation on technological production processes. It discusses methods and measures to increase the reuse of used asphalt pavement and their economic impact. Also, the chapter considers the strategy of reusing old asphalt pavement. The second chapter presents expert opinions and the significance of factors increasing the country’s relative amount of asphalt pavement recycling. It provides analyses of regulatory documents and strategy, threats and the challenges arising from them. Furthermore, it presents a mathematical model of the excess water evaporation during hot recycling. The third chapter presents the experimental studies’ results, and methods of reducing greenhouse gas emissions are discussed. It analyses and evaluates the parameters of the asphalt pavement in the asphalt mixer technology and the systematic ways of their improvement. Six articles were published on the dissertation’s topic: three in a scientific journal included in the Clarivate Analytics Web of Science database with a citation rate, two in publications of international conferences, referenced in other international databases (Elsevier and Springer), and one in international conference reference paper.
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