Abstract
The paper presents the proposition of special assessment of low temperature requirements for bitumens in the region of Central and Eastern Europe where there is a moderate transitional area from sea to the continental type of climate. The results of the research program conducted on the road neat bitumens, Styrene-Butadiene-Styrene polymer and polymer-rubber modified bitumen, and multigrade bitumen types were presented and discussed. Based on the Superior Performing Asphalt Pavements Performance Grade procedure for low temperatures, climatic zones in Poland were developed and compared to analogous zones for other countries from the Central and Eastern Europe region as Estonia and Belarus. The results of functional Performance Grade tests and European standard test of bituminous binders were analysed. It was concluded that some of the bitumens were not meet the performance requirements in the range of low temperatures by Superior Performing Asphalt Pavements Superpave specification and the low-temperature properties of those bitumens should be improved.
Highlights
In Central and Eastern Europe, encompassing Poland, there is a moderate transitional climate zone
Analysing the results of binder properties determined on the basis of tests in the BBR, it should be noted that the tested neat bitumens show unfavourable lowtemperature values, too high in relation to the minimum temperatures required for application in climatic conditions of Central and Eastern Europe
The following conclusions based on research and analyses were stated: 1. The climate conditions in Central and Eastern Europe are characterised by the occurrence of very low temperatures in winter, which is disadvantageous due to the durability of the road pavement structure
Summary
In Central and Eastern Europe, encompassing Poland, there is a moderate transitional climate zone. Bituminous binders and asphalt mixtures are important materials used to build road pavements in Central and Eastern Europe (Radziszewski, Nazarko, Vilutienė, Dębkowska, Ejdys, Gudanowska, Halicka, Kilon, Kononiuk, Kowalski, Król, Nazarko, & Sarnowski, 2016). It is preferred that the viscoelastic range of the bituminous binder is wide enough to match the climatic conditions of the region, determined by the lowest and highest temperature of the pavement layer in which the binder is used (Piłat & Radziszewski, 2010). To assess the low-temperature properties of bituminous binders, it is reasonable to analyse stiffness of bitumen and asphalt mixture at low temperature under static load and ability to reduce the thermal stress in time as a relaxation (Pszczola, Jaczewski, Rys, Jaskula, & Szydlowski, 2018). Any modification of existing criteria in EN-12591:2009 Bitumen and Bituminous Binders − Specifications for Paving Grade Bitumens and EN-14023:2010 Bitumen and Bituminous Binders − Specification Framework for Polymer Modified Bitumens standards should be proceeded by a full investigation of the bitumens available in the market
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