Evaluating the Effects of Recycling Agents on Asphalt Mixtures with High RAS and RAP Binder Ratios

Martin, Amy Epps; Kaseer, Fawaz; Arámbula-Mercado, Edith; Bajaj, Akash; Cucalon, Lorena Garcia; Yin, Fan; Chowdhury, Arif; Epps, J A; Glover, Charles J.; Hajj, Elie Y.; Morian, Nathan; Daniel, Jo Sias; Oshone, Mirkat; Rahbar-Rastegar, Reyhaneh; Ogbo, Chibuike; King, Gayle

doi:10.17226/25749

Cited by 12 publications

(3 citation statements)

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“…The relationship between resins and asphaltenes plays a crucial role in aging: the asphaltene fraction is the component that grows the most; at the same time, the resin content increases to a lesser extent, facilitating the mutual contacts between asphaltenes. When the ratio between aromatics and resins is not high enough to allow the peptization of the asphaltene micelles, or when the solvation capacity of the system is insufficient, the micelles tend to bond to each other [84]. This determines the formation of larger irregular structures in which voids are present (filled by the external liquid of the component micelles).…”

Section: Laboratory Aging Assessment Methods: General Resultsmentioning

confidence: 99%

A Review on Bitumen Aging and Rejuvenation Chemistry: Processes, Materials and Analyses

Prosperi

Bocci

2021

Sustainability

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During the last decades, extensive research has been carried out on using reclaimed asphalt pavement (RAP) material in the production of hot recycled mix asphalt. Unfortunately, the aged, stiff, and brittle binder in the RAP typically increases the mixture stiffness and can therefore cause fatigue and low-temperature damages. In the scientific literature, there are many studies concerning the aging and rejuvenation of bitumen, but there is a lack of up-to-date reviews that bring them together, especially those facing the phenomena from a chemical point of view. In this paper, a recap of the chemical aspects of virgin, aged, and rejuvenated bitumen is proposed in order to provide a useful summary of the state of the art, with the aim of both encouraging the use of an increasing quantity of RAP in hot mix asphalt and trying to give indications for further research.

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Section: Laboratory Aging Assessment Methods: General Resultsmentioning

confidence: 99%

A Review on Bitumen Aging and Rejuvenation Chemistry: Processes, Materials and Analyses

Prosperi

Bocci

2021

Sustainability

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“…Mechanical tools, such as bulldozers or excavators, can accomplish this. Only small pieces of pavement can be used for this technique [22][23][24][25]. Large chunks of pavement produced by this retarded method may be more difficult to recycle due to their size [26].…”

Section: Pavement Demolitionmentioning

confidence: 99%

Evaluating the Potential of Recycled Asphalt for Sustainable Road Construction: An Environmental and Economic Analysis

2023

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Objective: This study investigated the possibility of using recycled asphalt for road construction and maintenance in Kosovo. Methods: By analyzing statistical data from the Ministry of Infrastructure based on the status of infrastructure, the life cycle of asphalt, and investments in this area, this study determined the amount of asphalt that needs to be recycled. Results: The results showed that 1454008.5 m3 of asphalt needs to be recycled in Kosovo. We studied using 10%, 15%, and 20% recycled asphalt in asphalt base courses. We determined the benefits of recycled asphalt in terms of environmental protection, energy savings, and low cost. Depending on the percentage of recycled asphalt, the savings in mineral mix ranged from 11% to 23% and the road bitumen dosage from 6 to 8.5%. Novelty/Improvement: The proposed method of reusing recycled materials can reduce the consumption of natural resources, energy, and financial costs and help protect the environment. Doi: 10.28991/CEJ-2023-09-06-014 Full Text: PDF

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“…(BBR) threshold values stipulated use of softer binders in colder climates. High recycled binder ratio recycled mixes dictated softer binders or recycling oils to restore reclaimed asphalt pavements (RAP)/shingles (RAS) binders to usable consistencies (6,7). But refining softer binders required lower cut points in the vacuum tower, potentially leading to volatility issues such as high mass loss, low flash, and opacity.…”

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confidence: 99%

Proposed Changes to Asphalt Binder Specifications to Address Binder Quality-Related Thermally Induced Surface Damage

Elwardany

Planche

King

2022

Transportation Research Record: Journal of the Transportation R

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Superpave specifications address binder properties that may lead to rutting, transverse cracking, and fatigue damage with varying degrees of success. However, asphalt binder production and formulation has significantly changed and introduced much more variability in relation to quality since the development of the Superpave Performance-Grade system because of economic, technical, and environmental reasons. Consequently, aged-induced surface distresses under combined thermal and traffic loading have become the main challenge for highway agencies. Thermally induced surface deterioration appears in the form of traditional transverse cracking, block cracking, and raveling, or accelerating damage at construction joints. This study evaluated the limitations of the proposed linear viscoelastic (LVE) rheological cracking surrogates, such as ΔTc, R-value, and G-R parameters, and the ability of the Asphalt Binder Cracking Device (ABCD) failure test to overcome these limitations. ABCD is particularly appropriate to rank binder performance because the measured cracking temperature (Tcr) encompasses binder LVE properties, failure strength, coefficient of thermal contraction, and cooling rate. The proposed parameter (ΔTf = Tc(S = 300 MPa) from BBR—Tcr from ABCD) relates the failure temperature to the equi-stiffness temperature and gives credit to well-formulated and compatible polymer-modified binders expected to increase binder strength and strain tolerance. This paper proposes a specification framework based on both ΔTc and ΔTf, universally applicable, regardless of binder composition. Additionally, preliminary purchase specification limits for binders used in surface layers are proposed based on the analysis of 44 binders, 15 with corresponding field performance data. Obviously, as confirmed by a recent stakeholder workshop and industry feedback, these preliminary specification limits need further validation and possible adjustments to account for regional experience and local challenges.

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Evaluating the Effects of Recycling Agents on Asphalt Mixtures with High RAS and RAP Binder Ratios

Cited by 12 publications

References 0 publications

A Review on Bitumen Aging and Rejuvenation Chemistry: Processes, Materials and Analyses

A Review on Bitumen Aging and Rejuvenation Chemistry: Processes, Materials and Analyses

Evaluating the Potential of Recycled Asphalt for Sustainable Road Construction: An Environmental and Economic Analysis

Proposed Changes to Asphalt Binder Specifications to Address Binder Quality-Related Thermally Induced Surface Damage

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