Rheological Evaluation of Softened Binders Blended with Aged Asphalt Selected with a High-Temperature Mixing Chart

Ochoa-Ambriz, Leonardo; Pérez-Rea, María de la Luz; Hernández‐Padrón, Genoveva; Limón-Covarrubias, Pedro; Galaviz-González, José Roberto; Avalos-Cueva, David

doi:10.3390/ma15051775

Cited by 3 publications

(1 citation statement)

References 48 publications

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“…Applying asphalt binder additives can be utilised to achieve different goals, which may be as simple as softening the asphalt binder, reducing the asphalt mix processing temperatures, rejuvenating the properties of aged asphalt binder [ 4 ], or even mitigating the effects of binder ageing [ 5 ]. Commonly investigated additives such as petroleum oils, bio-oils [ 6 , 7 ], bio-polymers [ 8 ], and vegetable oil-based [ 9 ] additives usually decrease the stiffness of the asphalt binder [ 10 , 11 , 12 ] and may significantly impact other properties of the binders, such as temperature performance [ 13 ], fatigue resistance [ 14 , 15 ], and large strain performance [ 11 ], and these effects can be affected by binder ageing.…”

Section: Introductionmentioning

confidence: 99%

Ageing Evaluation of Foamed Polymer Modified Bitumen with Bio-Flux Additive

et al. 2023

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This paper presents the results of an analysis of the changes in the stiffness of asphalt binders modified with a bio-flux additive and subjected to the processes of foaming and short-term ageing. The purpose of the analyses was to determine changes in the rheological properties of asphalt binder as a result of technological processes characteristic of hot and warm mix asphalt technology. Three asphalt binders with similar penetration but varying degrees of polymer modification were tested: 50/70, 45/80–55 polymer-modified bitumen, and 45/80–80 highly modified bitumen. Tests were carried out on four groups of binders: original binders, foamed binders after 14 days of storage, non-foamed binders after Rolling Thin Film Oven Test (RTFOT) ageing, and foamed binders after 14 days of storage subjected to RTFOT ageing. The master curves of the complex shear modulus G* were analysed, and three indexes of binder stiffening were determined, characterising the investigated effects. The tests showed that some of the stiffening indices significantly depended on the degree of polymer modification and the content of the bio-flux additive. Moreover, it was found that the foaming process in the case of paving-grade bitumen and polymer-modified bitumen did not contribute to the additional stiffening of the binders.

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Section: Introductionmentioning

confidence: 99%

Ageing Evaluation of Foamed Polymer Modified Bitumen with Bio-Flux Additive

et al. 2023

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Effects of polymer structure on the physicochemical and performance-related properties of SBS-modified asphalt binders subjected to short-term aging

Zhu,

Wang,

Miljković

et al. 2024

Construction and Building Materials

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Enhancing Pavement Durability: Comparative Rheological Evaluation of Conventional and Rejuvenated Reclaimed Binders under Aging Conditions

Dabiri,

Silva,

Oliveira

2024

Materials

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A drawback of recycled mixtures containing reclaimed asphalt is their increased stiffness, further worsened by the accelerated aging of binders in extreme weather conditions. Previous studies have shown that while rejuvenating agents can mitigate some of these issues by improving flexibility and reducing brittleness, they often present challenges, such as performance variability and the potential for rutting. This study aims to develop an optimal blend of reclaimed bitumen, a rejuvenating agent, and pure bitumen to achieve rheological properties similar to a control 35/50 pen-grade bitumen for road paving. Hence, the rejuvenated binders comprised 30:70 blends of reclaimed asphalt bitumen and 50/70 pen-grade bitumen, adding 0.2% to 0.6% of a rejuvenating agent by mass of the reclaimed asphalt. Sample testing included conventional penetration grade, softening point, and viscosity tests, followed by dynamic shear rheometer tests under unaged, short-term, and long-term aging conditions. The results show that the binder blend with 0.4% rejuvenator closely resembles the rheological properties of 35/50 pen-grade bitumen. This blend exhibits a 20% to 55% stiffness reduction for recycled mixtures with 30% reclaimed asphalt. Notably, the rejuvenated binders exhibited a similar level of aging resistance to the control bitumen, with a marginal difference of less than 5% in aging ratios. Meanwhile, large strain amplitude tests showed the importance of defining maximum rejuvenating incorporation rates in recycled mixtures to avoid rutting problems, where binders with 0.4% rejuvenator doubled the rutting potential (Jnr values). This innovative study highlights the potential for enhancing recycled mixtures’ performance by evaluating rejuvenated reclaimed binders’ rheology subjected to different aging conditions, thus contributing to sustainability in pavement construction.

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Rheological Evaluation of Softened Binders Blended with Aged Asphalt Selected with a High-Temperature Mixing Chart

Cited by 3 publications

References 48 publications

Ageing Evaluation of Foamed Polymer Modified Bitumen with Bio-Flux Additive

Ageing Evaluation of Foamed Polymer Modified Bitumen with Bio-Flux Additive

Effects of polymer structure on the physicochemical and performance-related properties of SBS-modified asphalt binders subjected to short-term aging

Enhancing Pavement Durability: Comparative Rheological Evaluation of Conventional and Rejuvenated Reclaimed Binders under Aging Conditions

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