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

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Materials and Structures/Materiaux et Constructions, Volume 55, issue 2
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.
Funding Information: The authors would like to acknowledge the contributions of the active members of the RILEM technical committee TC 264-RAP in terms of experimental results, data analysis and proofreading. The authors would also like to thank Nynas AB, Kraton Chemical BV and Technical University of Braunschweig for supporting the interlaboratory activity by providing bituminous materials, ARA and RA binder. Publisher Copyright: © 2022, The Author(s).
Ageing, Asphalt Recycling Agent (ARA), Binder, Dynamic shear rheometer, Reclaimed asphalt, Rheology
Hugener , M , Wang , D , Cannone Falchetto , A , Porot , L , Kara De Maeijer , P , Orešković , M , Sa-da-Costa , M , Tabatabaee , H , Bocci , E , Kawakami , A , Hofko , B , Grilli , A , Pasquini , E , Pasetto , M , Zhai , H , Soenen , H , Van den bergh , W , Cardone , F , Carter , A , Vasconcelos , K , Carbonneau , X , Lorserie , A , Mladenović , G , Koudelka , T , Coufalik , P , Zhang , R , Dave , E & Tebaldi , G 2022 , ' Recommendation of RILEM TC 264 RAP on the evaluation of asphalt recycling agents for hot mix asphalt ' , Materials and Structures/Materiaux et Constructions , vol. 55 , no. 2 , 31 .