This paper presents the results of a preliminary study on the use of a novel ap-proach for the evaluation of the effectiveness of rejuvenating agents used in as-phalt mixtures containing reclaimed asphalt (RA). Such an approach is based on the mechanical testing of model systems constituted by a single-sized RA materi-al, in its original state and after pretreatment with rejuvenators, compacted to a target volumetric condition. Model systems were prepared by making use of two rejuvenators and by also considering a reference combination of virgin binder and aggregates extracted from the RA. Tests were carried out for the evaluation of stiffness modulus and indirect tensile strength as a function of curing time. Ex-perimental results showed that the proposed approach can capture the changes occurring in the aged RA binder as a consequence of the effects induced by reju-venators. Quantification of the rejuvenating effects was carried out by analyzing recorded stiffness and strength variations, and by referring to a ductility tough-ness index, introduced to better describe stress-strain response after failure.

Testing of reclaimed asphalt model systems for the evaluation of the effectiveness of rejuvenators / Dalmazzo, D.; Urbano, L.; Riviera, P. P.; Santagata, E.. - ELETTRONICO. - (2022), pp. 1751-1757. [10.1007/978-3-030-46455-4_222]

Testing of reclaimed asphalt model systems for the evaluation of the effectiveness of rejuvenators

D. Dalmazzo;L. Urbano;P. P. Riviera;E. Santagata
2022

Abstract

This paper presents the results of a preliminary study on the use of a novel ap-proach for the evaluation of the effectiveness of rejuvenating agents used in as-phalt mixtures containing reclaimed asphalt (RA). Such an approach is based on the mechanical testing of model systems constituted by a single-sized RA materi-al, in its original state and after pretreatment with rejuvenators, compacted to a target volumetric condition. Model systems were prepared by making use of two rejuvenators and by also considering a reference combination of virgin binder and aggregates extracted from the RA. Tests were carried out for the evaluation of stiffness modulus and indirect tensile strength as a function of curing time. Ex-perimental results showed that the proposed approach can capture the changes occurring in the aged RA binder as a consequence of the effects induced by reju-venators. Quantification of the rejuvenating effects was carried out by analyzing recorded stiffness and strength variations, and by referring to a ductility tough-ness index, introduced to better describe stress-strain response after failure.
978-3-030-46454-7
978-3-030-46455-4
ISBM 2020: Proceedings of the RILEM International Symposium on Bituminous Materials
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11583/2858160