Increasing the efficacy of recycling agents with simultaneous addition of zinc diethyldithiocarbamate as an antioxidant

Haghshenas, Hamzeh F.; Fini, Elham H.; Rea, Robert; Khodaii, Ali

doi:10.1016/j.conbuildmat.2020.121892

Cited by 24 publications

(11 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The rejuvenating effectiveness and the optimum dosages of the plasticizers should be further ascertained in a systematic experimental program that may involve performance evaluations related to rutting, low-temperature cracking, fatigue, moisture susceptibility, and perhaps even the long-term performance of the rejuvenated asphalts [ 29 , 48 ]. Depending on the findings, additional additives, such as anti-stripping and anti-oxidant agents, may be considered whenever necessary [ 49 , 50 ].…”

Section: Resultsmentioning

confidence: 99%

The Rejuvenating Potential of Plasticizers on Oxidatively Aged Asphalts: Rheological and Molecular Dynamics Perspectives

Cao

2022

Polymers

View full text Add to dashboard Cite

Recycle and reuse of waste asphalt materials in the pavement industry has brought tremendous contributions to the infrastructure sustainability and environmental preservation. The recent literature has suggested a great potential of plasticizers to be used for rejuvenating the oxidated paving asphalts. This study was aimed at assessing the rejuvenating effectiveness by rheological characterizations of two typical plasticizers, dibutyl phthalate (DBP) and tributyl citrate (TBC), selected based on the molecular structural differences. The underlying rejuvenating mechanisms were approached using molecular dynamics (MD) simulation, for probing the interactions between the plasticizers and oxidized asphaltenes and examining the outcomes in terms of deagglomeration. The results indicated that both plasticizers were highly effective in restoring the stiffness and elasticity properties as well as fatigue resistance of the aged asphalt. According to the simulations, the two plasticizers were able to deagglomerate the asphaltene associations. Owing to the high polarity and hydroxyl group, TBC appeared to be slightly more efficient in dissociating the asphaltenes, which explained its higher effectiveness in restoring the rheological properties as compared to DBP. Both the rheology and simulation results suggested that the plasticizers were rejuvenating instead of simply softening the aged asphalt.

show abstract

Section: Resultsmentioning

confidence: 99%

The Rejuvenating Potential of Plasticizers on Oxidatively Aged Asphalts: Rheological and Molecular Dynamics Perspectives

Cao

2022

Polymers

View full text Add to dashboard Cite

show abstract

“…A temperature increase could have a positive impact on the kinetics and aging process. , The aging process of asphalt is commonly a first-order kinetics equation that has large activation energy . Using antioxidants in bitumen could prevent its oxidation process and increase resistance to the formation of carbonyl and sulfoxides; in this case, the molecular weight of asphalt remains constant . Qiu et al added a nonionic dispersant to bitumen to decelerate the aging process and the physical hardening of asphalt.…”

Section: Chemical Agingmentioning

confidence: 99%

Future Directions for Applications of Bio-Oils in the Asphalt Industry: A Step to Sequester Carbon in Roadway Infrastructure

2023

Self Cite

View full text Add to dashboard Cite

The global emphasis on sustainability and net zero carbon roads combined with the increased cost of crude oil has necessitated the application of new environmentally friendly alternatives to the bitumen used in asphalt by the pavement industry. Physical aging, chemical aging, and moisture damage are three important matters encountered in the pavement industry that are harmful for asphalt; bio-oils can decelerate the rates of physical aging and chemical aging in virgin bitumen, and bio-oils can substantially improve virgin bitumen’s resistance to moisture damage. Bio-oils can also restore properties in environmentally damaged asphalt up to a certain limit of aging. The main goal of this review is a comprehensive analysis of the literature about the potential of bio-oils produced from different biomass sources to influence the physical aging, chemical aging, and moisture damage of asphalt. Considering that bitumen’s physical aging is highly impacted by the bitumen’s wax content, this review also covers the effect of wax inherently present in bitumen or wax added to bitumen as a modifier. It is concluded that the chemical composition of a bio-oil has a significant impact on the bio-oil’s ability to protect or recover the bitumen’s original properties. Phenolic compounds found in bio-oils have antiaging effects while bio-oils’ acidic compounds may lead to moisture susceptibility.According to the literature, most bio-oils have positive effects only in a specific range of temperatures: low, intermediate, or high. Complete miscibility and dispersion of a bio-oil in the asphalt matrix also have a significant influence on making a bio-oil an effective modifier. Generally, bio-oils are promising as sustainable, carbon-neutral, cost-effective alternatives to replace or modify conventional bitumen in the pavement industry. This review has identified the following critical research gaps: (1) the lack of standard methods for evaluating and reporting the performance characteristics of each bio-oil in bitumen; (2) the lack of long-term field performance data on bio-oils to support comprehensive life-cycle assessments and life-cycle analyses; (3) high variation among bio-oils made from the same feedstock through different processing methods, leading to variation in performance characteristics; (4) the lack of accurate technoeconomic analysis on industrial bio-oils to facilitate entry of bio-oils into the asphalt market.

show abstract

“…On the other hand, triglycerides and fatty acids from vegetable-based oils such as corn and soybean oils have been the center of attention in recent years since they are a sustainable source of RAs that are renewable, environmentally green, available, and highly effective (20)(21)(22)(23). However, some researchers have reported that the effect of triglycerides and fatty acids on the long-term performance and moisture-damage resistance of asphalt binders could be a concern (19,20,(23)(24)(25)(26)(27)(28)(29).…”

mentioning

confidence: 99%

“…Addressing the concerns about the long-term performance of asphalt binders modified by triglycerides and fatty acids RAs, some researchers have realized that there are methods that can be used to improve the aging resistance of these binders, such as the esterification of triglycerides and fatty acids or the combination of these RAs with AOs. For example, Haghshenas et al ( 26 ) modified paraffinic oils, triglycerides and fatty acids, and tall oils with ZnDEC as an AO and studied the long-term performance of asphalt binders modified with RAs and this AO under various aging conditions. They reported that the simultaneous addition of RAs and ZnDEC could slow the binders’ susceptibility to aging.…”

mentioning

confidence: 99%

Using Crude Vegetable-Based Oils and Antioxidants to Improve the Performance of Asphalt Binders

Ahmad

Khedmati

Fatmehsari

2023

Transportation Research Record: Journal of the Transportation R

View full text Add to dashboard Cite

Vegetable-based oils have been the center of attention in research on reclaimed asphalt pavement in recent years, since they are sustainable sources of recycling agents (RAs). However, there could be concern about the long-term performance and the resistance to moisture damage of asphalt binders modified by these oils. Crude corn oil (CO) and crude soybean oil (SO) have been studied as RAs for aged asphalt binder to improve their physical and rheological performances. It is hypothesized that the efficacy of vegetable-based RAs can be improved by the simultaneous addition of these RAs and an antioxidant to the binder. This study evaluates the synergy between vegetable-based RAs (i.e., CO and SO) and two antioxidants (zinc diethyldithiocarbamate [ZnDEC] and dilauryl thiodipropionate [DLTDP]) using physical and rheological characterization at high, ambient, and sub-zero temperatures. The results show that CO and SO improved the high-temperature rutting and mid-temperature cracking index of asphalt binders while worsening their low-temperature cracking index. The efficacy of CO and SO was improved by the simultaneous addition of ZnDEC. However, the asphalt binders modified by CO or SO with ZnDEC had lower resistance to moisture damage. The results also show that the simultaneous addition of DLTDP and CO or SO did not improve the efficacy of CO and SO and even resulted in inferior asphalt binders.

show abstract

Increasing the efficacy of recycling agents with simultaneous addition of zinc diethyldithiocarbamate as an antioxidant

Cited by 24 publications

References 24 publications

The Rejuvenating Potential of Plasticizers on Oxidatively Aged Asphalts: Rheological and Molecular Dynamics Perspectives

The Rejuvenating Potential of Plasticizers on Oxidatively Aged Asphalts: Rheological and Molecular Dynamics Perspectives

Future Directions for Applications of Bio-Oils in the Asphalt Industry: A Step to Sequester Carbon in Roadway Infrastructure

Using Crude Vegetable-Based Oils and Antioxidants to Improve the Performance of Asphalt Binders

Contact Info

Product

Resources

About