Do all rejuvenators improve asphalt performance?

Rajib, Amirul Islam; Samieadel, Alireza; Zalghout, Ali; Kaloush, Kamil; Sharma, Brajendra K.; Fini, Elham H.

doi:10.1080/14680629.2020.1826348

Cited by 59 publications

(24 citation statements)

References 42 publications

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“… 51 − 53 The polydispersity of asphaltenes is reported to increase with aging, and the polydispersity is inversely proportional to the cross modulus. 28 , 51 Thus, the appropriate rejuvenators to disaggregate or disperse asphaltene clusters will increase the cross modulus of aged asphalt binder.…”

Section: Resultsmentioning

confidence: 99%

“…Tests were conducted at 10 °C with frequencies of 0.1–100 rad/s and at a strain rate of 0.1%. 28 For this study, an 8 mm parallel plate spindle was used. Using the corresponding storage modulus ( G ′) and loss modulus ( G ″) results, the crossover modulus G c (at which G ′ is equal to G ″) was determined.…”

Section: Methodsmentioning

confidence: 99%

“… 26 , 27 Actually, a true rejuvenator should be a kind of asphalt additive that can deagglomerate large asphaltene assemblies into smaller nanoaggregates while replenishing the lost compounds. 28 It is reported that swine manure was effective in restoring oxidized asphalt’s thermomechanical properties as amide groups in it interact with asphaltene molecules, increasing the stacking distance of asphaltene dimers while changing their conformational packing. 29 From this perspective, the current mainstream of bio-rejuvenators pays little attention to the investigation of disaggregating oxidized asphaltene nanoclusters.…”

Section: Introductionmentioning

confidence: 99%

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Research on the Ability of Bio-rejuvenators to Disaggregate Oxidized Asphaltene Nanoclusters in Aged Asphalt

Zheng

et al. 2022

ACS Omega

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A real rejuvenator must have the ability to disaggregate oxidized asphaltene nanoclusters. However, few studies pay attention to the topic, and there is a lack of comparison of the disaggregation ability of different rejuvenators. Thus, the disaggregation ability and regeneration mechanism of three bio-rejuvenators (waste cooking oil (WCO), waste wood oil (WWO), and straw liquefied residue oil (SLRO)) on oxidized asphaltene nanoclusters were studied in this paper. Laboratory tests and molecular dynamics (MD) simulation were used to compare the effectiveness of the three bio-rejuvenators and reveal its corresponding mechanism. It is found that these bio-rejuvenators have a softening effect on aged asphalt binder, but not all of them can disaggregate oxidized asphaltene nanoclusters. The introduction of WWO and WCO can effectively disturb the nanoclusters caused by the increase of polar functional groups during the oxidation process. The effect of WWO is more significant, but neither of them can restore the asphaltene dispersion to the virgin asphalt binder. SLRO has an adverse effect on the disaggregation of oxidized asphaltene nanoclusters. WCO, WWO, and SLRO showed different disaggregation mechanisms, including ″pull-out, intercalation, and compression″, respectively. WCO and WWO can increase the activation energy reduced by aging in a short aging time, and SLRO makes the activation energy lower. Such findings can help enterprises screen more reasonable rejuvenators to facilitate the recycling of reclaimed asphalt pavement (RAP) materials and promote the sustainable development of the construction industry.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Research on the Ability of Bio-rejuvenators to Disaggregate Oxidized Asphaltene Nanoclusters in Aged Asphalt

Zheng

et al. 2022

ACS Omega

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“…The conducted research about incorporating waste or by-product into building materials was already widely accepted within the frameworks of waste management and resource efficiency. With the emergence of CE, these practices have intensified, and several studies have further investigated the use of secondary materials into concrete [139], bricks [70], ceramics [60], steel [61], polymers [118] and road pavements [146].…”

Section: Discussionmentioning

confidence: 99%

Selection Criteria for Building Materials and Components in Line with the Circular Economy Principles in the Built Environment—A Review of Current Trends

2021

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A growing concern is given to the environmental impacts caused by the construction industry. Waste generation, resource consumption, and greenhouse gas emissions are the main drawbacks of the rapid urbanization that the world is witnessing. As a response to these pressing issues, policymakers and academia are exploring the concept of Circular Economy (CE) to manage resources better and achieve resource efficiency while eliminating waste. One of the strategies to implement CE in the built environment is to select the appropriate building materials and components from the early stages to carry out the concept’s principles along the value chain and create a closed-loop system. Therefore, this study aims at identifying selection criteria for building elements according to CE principles through a review of the latest research. Results have shown that little has been concretely achieved in terms of a paradigm shift to CE since the main focus of the literature is still the use of recycled products and the recyclability of building materials and components at their end-of-life. Although the present study is solely focused on the technical aspect of building materials and components, it outlines current adopted criteria to bring about a circular built environment and highlights the need for a more innovative approach to attain higher circularity levels.

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“…The rejuvenation of aged bitumen is mainly produced by adding a rejuvenating agent to the aged bitumen. , Researchers have studied the merits of a variety of rejuvenators, bio-sourced and not bio-sourced. , However, not all the rejuvenators can properly restore aged bitumen, and some even compromise the durability of the restored aged bitumen . Therefore, there is an urgent need to develop a highly effective rejuvenating agent that enhances durability.…”

Section: Introductionmentioning

confidence: 99%

Balancing the Aromatic and Ketone Content of Bio-oils as Rejuvenators to Enhance Their Efficacy in Restoring Properties of Aged Bitumen

Rajib

Sarker

et al. 2021

ACS Sustainable Chem. Eng.

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The potential of the bio-oil from the co-pyrolysis of poplar wood and waste tire rubber to revitalize severely aged bitumen was examined by shifting the balance of aromatics and ketones in the bio-oil. Laboratory experiments were performed to compare the revitalization efficiency of bio-oils from the pyrolysis of poplar wood and co-pyrolysis of wood and waste tire rubber. Furthermore, the chemical compositions of the bio-oils from both processes were studied using gas chromatography−mass spectrometry to distinguish how each bio-oil revitalized severely aged bitumen. The results showed that the wood pyrolysis bio-oil had high phenol and ketone relative contents but very low aromatic and alkane relative contents. In contrast, significant relative amounts (19.18%) of aromatics and alkanes and a lower ketone relative content (0.95%) were found in the co-pyrolysis bio-oil. The rheological characterization of aged bitumen rejuvenated with both bio-oils showed that the co-pyrolysis bio-oil was much more effective than the wood pyrolysis bio-oil, which was evidenced by a higher crossover modulus and frequency as well as lower shear thinning in the aged bitumen rejuvenated by the co-pyrolysis bio-oil. These results prove that the co-pyrolysis bio-oil is a potential asphalt rejuvenator.

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Do all rejuvenators improve asphalt performance?

Cited by 59 publications

References 42 publications

Research on the Ability of Bio-rejuvenators to Disaggregate Oxidized Asphaltene Nanoclusters in Aged Asphalt

Research on the Ability of Bio-rejuvenators to Disaggregate Oxidized Asphaltene Nanoclusters in Aged Asphalt

Selection Criteria for Building Materials and Components in Line with the Circular Economy Principles in the Built Environment—A Review of Current Trends

Balancing the Aromatic and Ketone Content of Bio-oils as Rejuvenators to Enhance Their Efficacy in Restoring Properties of Aged Bitumen

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