Effects of Rejuvenation and Aging on Binder Homogeneity of Recycled Asphalt Mixtures

Mohammadafzali, Mojtaba; Ali, Hesham; Sholar, Gregory A.; Rilko, Wayne A.; Baqersad, Mohamadtaqi

doi:10.1061/jpeodx.0000089

Cited by 20 publications

(6 citation statements)

References 10 publications

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“…The main reasons for the high potential in both cohesive cracking and adhesive debonding of RAP material are attributed to the aged bitumen's considerable stiffness and moisture sensitivity [8]. Moreover, the aging mechanisms of bitumen are mainly composed of lightweight components' (saturates and aromatics) evaporation and conversion to heavy fractions (resins and asphaltenes) [9]. Meanwhile, the oxygen-containing functional groups (i.e., carbonyl and sulfoxide) are fabricated distinctly in bitumen molecules [10].…”

Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulation and experimental validation on the interfacial diffusion behaviors of rejuvenators in aged bitumen

Ren¹,

Liu²,

Gao³

et al. 2023

Materials & Design

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Section: Introductionmentioning

confidence: 99%

Molecular dynamics simulation and experimental validation on the interfacial diffusion behaviors of rejuvenators in aged bitumen

Ren¹,

Liu²,

Gao³

et al. 2023

Materials & Design

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“…The chemical effects of rejuvenators have been investigated in a number of research projects. The method of combining rejuvenators with aged RAP binder is presented in article [21].…”

Section: Issues Of Utilization Of Reclaimed Asphalt Materialsmentioning

confidence: 99%

Archives of Civil Engineering

Sorociak¹,

Grzesik²,

Bzówka³

et al. 2020

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The problem of recycled materials application in road construction is one of the key issues in contemporary road engineering. This article describes attempts to produce a hot mix asphalt (HMA) mixture entirely from processed reclaimed asphalt pavement (RAP) material. Due to the binder ageing process, rejuvenating agent was a necessary additive to the mixture. The mixture was tested to determine its parameters, including the content of voids, fatigue life, rutting resistance, stiffness and water sensitivity. The test results demonstrated that the rejuvenated RAP mixture is not inferior to fresh produced mixtures in terms of physical and strength parameters. Such results are, however, conditional on appropriate handling of the RAP material.

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“…Applying reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS) in new pavement construction can have significant environmental and economic advantages. Studies have shown that the reuse of RAP saves approximately USD 2.5 billion annually, avoiding the need for vast landfill space and preserving natural resources [1][2][3][4][5]. State departments of transportation (DOTs) limit the amount of RAP to be utilized in a ton of asphalt mixture due to the potential adverse effects of RAP on the performance of the resulting pavement.…”

Section: Introductionmentioning

confidence: 99%

The Influence of a New Food Waste Bio-Oil (FWBO) Rejuvenating Agent on Cracking Susceptibility of Aged Binder and RAP

Abdalla

Ayranci

2022

Sustainability

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This research aims to deliver a new promising asphalt binder rejuvenator developed from food waste to mitigate the effects of aging on the asphalt. The research relied on three different binders: two unmodified PG 64–22 binders and a Polymer Modified (PMA) PG 76–22 binder. Moreover, a field-extracted RAP binder is utilized in evaluating the rejuvenator’s efficiency. For this study, the proposed food waste bio-oil (FWBO) is compared against two market-available rejuvenators. The experimental program relied on aging control binder samples for each asphalt type with no rejuvenation using the Rolling Thin Film Oven (RTFO) test, followed by the Pressure Aging Vessel (PAV) test for 20 hours to create an Artificial RAP (ARAP) binder. Then, ARAP and RAP binders were blended with 5% by their weight with one of the two on-market rejuvenators (#1, #2) or the proposed FWBO rejuvenator. Testing results reveal that low-temperature relaxation was significantly improved for all the investigated samples after an additional PAV aging cycle, as Delta Tc values increased compared to the control binders. Further, samples’ master curves were used to calculate the Glover–Rowe (G-R) parameter, crossover frequency, and modulus (ωc, Gc*). The results clearly showed the ability of the FWBO to reduce the aging rate and improve the rheological properties of RAP binders. Further, the Fourier Transform Infrared Spectroscopy (FTIR) test showed that the new FWBO rejuvenator reduces the oxidation levels of the aged RAP binders, as suggested by the carbonyl index.

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Effects of Rejuvenation and Aging on Binder Homogeneity of Recycled Asphalt Mixtures

Cited by 20 publications

References 10 publications

Molecular dynamics simulation and experimental validation on the interfacial diffusion behaviors of rejuvenators in aged bitumen

Molecular dynamics simulation and experimental validation on the interfacial diffusion behaviors of rejuvenators in aged bitumen

Archives of Civil Engineering

The Influence of a New Food Waste Bio-Oil (FWBO) Rejuvenating Agent on Cracking Susceptibility of Aged Binder and RAP

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