Role of Chemical Composition of Recycling Agents in Their Interactions with Oxidized Asphaltene Molecules

Fini, Elham H.; Rajib, Amirul Islam; Oldham, Daniel; Samieadel, Alireza; Hosseinnezhad, Shahrzad

doi:10.1061/(asce)mt.1943-5533.0003352

Cited by 65 publications

(31 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When asphalt samples were exposed to UV aging, their carbonyl index and sulfoxide index increased, with the largest increase happening in the first 50 h. Asphalt samples without biochar showed a higher increasing rate than asphalt samples with biochar. To facilitate comparing studied scenarios, the sum of the two indexes was calculated at each aging interval and referred to as the chemical aging index (CAI), following the method used by other researchers. − The asphalt sample without biochar showed a CAI of 22% after 50 h and 40% after 200 h of aging (Table ). Among all asphalt samples with biochar, the sample containing algal biochar (100–0 scenario) had the lowest CAI value of 17% after 50 h and 26% after 200 h of aging.…”

Section: Resultsmentioning

confidence: 99%

“…It should be noted that the crossover values (frequencies at which storage modulus and loss modulus are equal) are reported to be reliable measures to track changes in the polydispersity of bitumen . Considering that progressive aging leads to significant changes in polydispersity as asphaltene molecules forms nanoaggregates, , crossover values are deemed appropriate to not only track the evolution of bitumen during aging but also rejuvenation . Provided the crossover frequency and corresponding crossover moduli are measured at the same temperature for all bitumen specimens in comparison, the crossover values can properly detect and compare the extent of aging and in this study extent of delay in aging. in which where γ max = maximum strain, τ max = maximum stress, T = maximum applied torque, r = radius of the sample, θ = deflection (rotational) angle, and h = height of the sample.…”

Section: Experiments Planmentioning

confidence: 99%

See 1 more Smart Citation

Inherently Functionalized Carbon from Lipid and Protein-Rich Biomass to Reduce Ultraviolet-Induced Damages in Bituminous Materials

Rajib

Fini

2020

ACS Omega

Self Cite

View full text Add to dashboard Cite

This paper examines the merits of using an inherently functionalized carbon, referred to as biochar as a free radical scavenger. The biochar was made from thermochemical liquefaction of a blend of algae (rich in protein and nucleic acids) and manure (rich in lipid). Here, we studied biochar’s efficacy as a free-radical scavenger and ultraviolet blocker to qualify it as an anti-aging additive in construction, including roofing shingles made from the bituminous composite. The study’s results show that the addition of biochar to bitumen significantly reduced the aging of bitumen. All tested biochars made from various relative proportions of algae and swine manure were found to be effective at reducing the extent of aging; however, the biochar made from algae alone was the most effective. The algal biochar was found to be an effective antiaging additive delaying aging up to 36%, as evidenced by lower rheology and the chemistry-based aging index compared to those of control bitumen after being exposed to the same aging protocol. Algal biochar was found to be more effective than other studied biochar scenarios owing to its inherently functionalized nature. The latter result could be attributed to the high surface area and rich phenol functional groups in algal biochar, turning it into an effective free-radical scavenger. The study outcome highlights the applicability of this inherently functionalized carbon referred to as biochar in construction to enhance sustainability while promoting the circular economy and the biomass value chain.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Experiments Planmentioning

confidence: 99%

Inherently Functionalized Carbon from Lipid and Protein-Rich Biomass to Reduce Ultraviolet-Induced Damages in Bituminous Materials

Rajib

Fini

2020

ACS Omega

Self Cite

View full text Add to dashboard Cite

show abstract

“… 19 − 21 Many studies have evaluated the regeneration performance of bio-rejuvenators from the macroscopic and microscopic perspectives, including mechanical properties, 22 , 23 rheological properties, fatigue properties, and chemical properties. 24 , 25 However, little attention has been paid to the deagglomeration of oxidized asphaltene nanoclusters by bio-rejuvenators. It is proved that the ability to properly dissolve and disperse macromolecules and microstructures in aged asphalt binder is the key to the durability and reaging resistance of recycled asphalt.…”

Section: Introductionmentioning

confidence: 99%

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

Zheng

et al. 2022

ACS Omega

View full text Add to dashboard Cite

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.

show abstract

“…Hence, to recycle aged bitumen and use it in new-pavement construction, there is a need to rejuvenate its properties to restore the performance characteristics. The latter involves the restoration of molecular conformation, which can be reflected in enhancing the thermomechanical properties of aged bitumen to be closer to those of new bitumen …”

Section: Introductionmentioning

confidence: 99%

“…The latter involves the restoration of molecular conformation, which can be reflected in enhancing the thermomechanical properties of aged bitumen to be closer to those of new bitumen. 39 The rejuvenation of aged bitumen is mainly produced by adding a rejuvenating agent to the aged bitumen. 40,41 Researchers have studied the merits of a variety of rejuvenators, bio-sourced and not bio-sourced.…”

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.

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Role of Chemical Composition of Recycling Agents in Their Interactions with Oxidized Asphaltene Molecules

Cited by 65 publications

References 46 publications

Inherently Functionalized Carbon from Lipid and Protein-Rich Biomass to Reduce Ultraviolet-Induced Damages in Bituminous Materials

Inherently Functionalized Carbon from Lipid and Protein-Rich Biomass to Reduce Ultraviolet-Induced Damages in Bituminous Materials

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

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

Contact Info

Product

Resources

About