Effect of bio-oil on rheological and calorimetric properties of RTFOT aged bituminous compositions
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International Journal of Pavement Research and Technology Journal homepage: www.springer.com/42947
Effect of bio-oil on rheological and calorimetric properties of RTFOT aged bituminous compositions A. Ābelea*, R. Merijs-Meria, R. Bērziņaa, J. Zicānsa, V. Haritonovsb, T. Ivanovaa a
Institute of Polymer Materials, Faculty of Materials Science and Applied Chemistry, Riga Technical University, Riga, Latvia b Department of Roads and Bridges, Faculty of Civil Engineering, Riga Technical University, Riga, Latvia Received 28 February 2020; received in revised form 10 October 2020; accepted 15 October 2020
Abstract
In the current research rejuvenation of aged bitumen by the oxidation product of rapeseed oil biodiesel (F) is considered thu s contributing to the solution of global warming. Aging of bitumen was performed by rolling thin film oven test (RTFOT). In the first stage RTFOT bitumen was modified with F at various weight contents (2, 5, 10 wt.%). Subsequently, 2 wt.% of F was introduced into different modified bituminous compositions with total polymer content of 3 wt.%. In comparison to the traditionally used styrene-butadiene copolymer (SBS), ethylene-octene copolymer with α-octene group content of 38% (EOC) were applied as F rejuvenated RTFOT modifiers. Structure as well as rheological properties of thus modified bitumin ous systems were characterised using dynamic shear rheometer (DSR), Fourier-transform infrared spectrometer (FTIR), and temperature-modulated differential scanning calorimeter (MDSC). It has been demonstrated that F rejuvenated polymer modified RTFOT demonstrates improved low-temperature properties, as well as increased rutting resistance and fatigue resistance. Keywords: Modification of RTFOT bitumen; Elastomer; Bio-oil; Rheological properties; Structural
1. Background In the last decade implementing of circular economy model has become one of the most important tasks for all industrial sectors, including road engineering. Various solutions are being already implemented, particularly, related to the use of reclaimed asphalt binder and other secondary materials (e.g., fillers, aggregates, modifiers) from various industrial sectors, where the main aim is reducing virgin materials percentage inside the asphalt mixture. Additional benefits of these approaches are reduced carbon footprint and greenhouse gas emissions. Asphalt pavement binder has an important role on pavement sustainability, it provides water resistance, flexibility and adhesion between all asphalt components. Since ancient times bitumen has been used as binder for road construction due to its waterproofing, adhesive and, to certain extent, also ductility characteristics [1]. However, the direct use of mined asphalt for road paving is now almost entirely local, having been replaced by manufactured asphalt, which can be tailored to specific requirements [2]. In the case of manufactured asphalt bitumen is collected as the residue– * Corresponding author E-mail addresses: [email protected], https://orcid.org/00000002-5296-8449 (A
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