Recommendation of RILEM TC 264 RAP on the evaluation of asphalt recycling agents for hot mix asphalt

• Published in: Materials and structures Vol. 55; no. 2
• Main Authors: Hugener, Martin, Wang, Di, Cannone Falchetto, Augusto, Porot, Laurent, Kara De Maeijer, Patricia, Orešković, Marko, Sa-da-Costa, Margarida, Tabatabaee, Hassan, Bocci, Edoardo, Kawakami, Atsushi, Hofko, Bernhard, Grilli, Andrea, Pasquini, Emiliano, Pasetto, Marco, Zhai, Huachun, Soenen, Hilde, Van den bergh, Wim, Cardone, Fabrizio, Carter, Alan, Vasconcelos, Kamilla, Carbonneau, Xavier, Lorserie, Aurelie, Mladenović, Goran, Koudelka, Tomas, Coufalik, Pavel, Zhang, Runhua, Dave, Eshan, Tebaldi, Gabriele
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01-03-2022; Springer Nature B.V
• Subjects: Asphalt mixes; Asphalt pavements; Binders (materials); Building construction; Building Materials; Civil Engineering; Engineering; High temperature; Laboratories; Machines; Manufacturing; Material properties; Materials Science; Mixtures; Physical properties; Processes; Recycling; Rheological properties; RILEM TC Recommendation; Solid Mechanics; Theoretical and Applied Mechanics; Binder; Asphalt Recycling Agent (ARA); Reclaimed asphalt; Rheology; Ageing; Dynamic shear rheometer
• ISSN: 1359-5997; 1871-6873
• DOI: 10.1617/s11527-021-01837-0

This recommendation is based on the results of an inter-laboratory study organised by the RILEM technical committee TC 264-RAP "Asphalt Pavement Recycling"—Task Group 3 (TG3) focusing on Asphalt Binder for Recycled Asphalt Mixture. The TG3 aimed to evaluate the effect of a specific family of materials known as asphalt recycling agent (ARA) on the aged binder under different configurations. Even though ageing is an irreversible phenomenon, effective ARA must have the capability to improve the flexibility of the bituminous materials and their resistance against cracking susceptibility with no adverse effect on the rutting resistance of pavements containing reclaimed asphalt. A total of 17 participating laboratories analysed the properties of binder blends composed of aged binder from reclaimed asphalt in three different contents (60, 80, 100%), ARA and virgin binder. The physical properties of the blends were thoroughly evaluated through traditional and rheological binder testing. This recommendation proposes to restore the original material properties at low and intermediate temperatures (i.e. cracking resistance) while balancing the high-temperature characteristics (i.e. rutting susceptibility) with durable impact throughout the progression of ageing phenomena. Therefore, useing of the Dynamic Shear Rheometer is foreseen as a more suitable and sustainable means to evaluate binder blends containing an asphalt recycling agent. Compared with conventional testing, the proposed approach requires fewer materials while resulting in a faster experimental procedure with one single test.