Abstract
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.
Highlights
The aim of the RILEM TC RAP—Task Group 3 (TG3) on Asphalt Binder for Recycled Asphalt Mixture was to develop aM
The proposed approach represents an alternative to the comprehensive analysis commonly performed when relying on the Performance Grade (PG) system [20] based on Dynamic Shear Rheometer (DSR) and Bending Beam Rheometer (BBR) testing at various temperatures
The binder blend must accurately represent the binder in the specific Hot Mix Asphalt (HMA) containing the selected amounts of Reclaimed Asphalt (RA)
Summary
The aim of the RILEM TC RAP—TG3 on Asphalt Binder for Recycled Asphalt Mixture was to develop a. To simulate a 60% recycling mixture at the binder level, 60% (by mass) of RA binder is blended with 40% virgin binder This process assumes that the binder contents in the RA material and final asphalt mixture containing RA are. Pasetto Department of Civil, Environmental and Architectural Engineering (ICEA), University of Padua, 35131 Padua, Italy. The binder blends were analysed in three ageing states: unaged, short-term (STA) and long-term aged (LTA) Their physical properties were measured using conventional testing methods such as penetration [5, 6] and softening point ring and ball [7, 8]. The detailed procedure is described in the State of the Art-Report (STAR) [13] and different publications [14,15,16]
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