Detail publikace

Rheological evaluation of asphalt blends at multiple rejuvenation and aging cycles

KOUDELKA, T. COUFALÍK, P. FIEDLER, J. COUFALÍKOVÁ, I. VARAUS, M. YIN, F.

Originální název

Rheological evaluation of asphalt blends at multiple rejuvenation and aging cycles

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

The use of recycling agents has become a common practice to produce asphalt mixtures with high contents of reclaimed asphalt materials. Previous studies have shown that characterisation of rejuvenated asphalt blends using empirical tests, used for evaluation of ordinary bituminous binders in accordance with EN 12591, might not be sufficient. It was also proven that if the aged binder is restored in one parameter such as penetration or softening point, it does not necessarily mean that the other rheological properties are restored in the same way. For this reason, this paper characterises the behaviour of rejuvenated asphalt blends using two rheological parameters: the Glower-Rowe (G-R) parameter and the difference between the low-temperature continuous performance grades determined from the bending beam rheometer (BBR) stiffness and m-value criteria (ΔTc). Recycling agents were added to an artificially aged asphalt binder. The first rejuvenation cycle of rejuvenation refers to 4 aging stages: no aging, rolling thin film oven test (RTFOT) aging, RTFOT combined with pressurised aging vessel (PAV) and RTFOT combined with two consecutive PAVs. In the second rejuvenation cycle, additional recycling agents of the same origin were added to the aged rejuvenated asphalt blends from the first rejuvenation cycle. The blends were then subject to further RTFOT aging and combined RTFOT and PAV. The obtained results showed that some rejuvenated asphalt blends did not satisfy the suggested threshold values set in literature for the G-R and ΔTc parameters after long-term aging in the first rejuvenation cycle, and that most rejuvenated asphalt blends in the second cycle of rejuvenation did not meet the performance requirements after 20 h of PAV aging.

Klíčová slova

multiciple recycling, rejuvenation, aging, recycling agents, performance parameters

Autoři

KOUDELKA, T.; COUFALÍK, P.; FIEDLER, J.; COUFALÍKOVÁ, I.; VARAUS, M.; YIN, F.

Vydáno

14. 3. 2019

Nakladatel

Taylor and Francis Group

Místo

London

ISSN

1468-0629

Periodikum

Road Materials and Pavement Design

Ročník

1

Číslo

1

Stát

Francouzská republika

Strany od

s3

Strany do

s18

Strany počet

16

URL