Rheological Performance and Differences between Laboratory-Aged and RAP Bitumen

Traditional recycled asphalt pavement (RAP) binder extraction is not a cost-effective and sustainable option for a quick field study because it requires the use of a huge amount of solvent. Hence, most of the studies on asphalt pavement are carried out with laboratory-aged bitumen in accordance with...

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Veröffentlicht in:Materials 2024-08, Vol.17 (16), p.3954
Hauptverfasser: Baldino, Noemi, Mileti, Olga, Marchesano, Ylenia Maria, Lupi, Francesca R, Gabriele, Domenico, Paolini, Massimo
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container_issue 16
container_start_page 3954
container_title Materials
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creator Baldino, Noemi
Mileti, Olga
Marchesano, Ylenia Maria
Lupi, Francesca R
Gabriele, Domenico
Paolini, Massimo
description Traditional recycled asphalt pavement (RAP) binder extraction is not a cost-effective and sustainable option for a quick field study because it requires the use of a huge amount of solvent. Hence, most of the studies on asphalt pavement are carried out with laboratory-aged bitumen in accordance with well-established procedures, i.e., the pressure aging vessel (PAV). Unfortunately, some studies highlight the differences between bitumen aged in the laboratory and in service because it is difficult to reproduce extreme conditions such as real conditions, both atmospheric and load; and this also affects the choice and use of rejuvenators, sometimes compromising the interpretation of results. This study aims to compare the thermo-rheological behavior of a 70/100 bitumen aged with the PAV and two different binders extracted by RAPs. The rheological performances of bitumens were compared in temperature and by dynamic oscillatory tests and steady-state tests, resulting in strength and viscosity values higher for samples with RAP binders compared to the PAV sample. The same bitumens were tested with the addition of a 3% / of soybean oil (SO). The results show a decrease in the moduli and viscosity at all the temperatures investigated when SO is added to the laboratory-aged bitumen, while no appreciable differences are evident on naturally aged samples added with SO. Differences were evaluated in terms of cross-over frequency and rheological parameters. Furthermore, the SO effect showed substantial differences, especially in viscosity values, indicating that the study of regenerated or modified bitumen from aged bitumen still requires study, as current standard techniques and procedures cannot emulate real aging conditions well.
doi_str_mv 10.3390/ma17163954
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source MDPI - Multidisciplinary Digital Publishing Institute; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; PubMed Central; Free Full-Text Journals in Chemistry; PubMed Central Open Access
subjects Aggregates
Aging
Asphalt industry
Asphalt pavements
Bitumens
Bituminous materials
Chemical reactions
Extreme values
Laboratories
Oxidation
Parameter modification
Recycling
Rheological properties
Rheology
Soybean
Triglycerides
Ultraviolet radiation
Vegetable oils
Viscosity
title Rheological Performance and Differences between Laboratory-Aged and RAP Bitumen
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