Influence of Ultraviolet and Oxygen Coupling Aging on Rheological Properties and Functional Group Index of Warm Mix Asphalt Binder

Li, Hailian; Tong, Peipei; Zhang, Xijun; Lin, Xixiong; Li, Bo

doi:10.3390/ma13194216

Cited by 20 publications

(7 citation statements)

References 26 publications

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“…The second stage of bitumen aging, long-term aging, occurs due to progressive mass loss and progressive oxidation of bitumen when it is exposed to low-temperature environmental conditions and solar irradiation (photooxidation) for a long duration. − The degradation of bitumen under solar irradiation is attributed to the formation of free radicals that are produced by radiant energy such as UV. , Compared to thermal oxidation, UV exposure of bitumen causes a greater increase in carbonyl and sulfoxide compounds. , The formation of free radicals along with other mechanisms such as aromatization, carbonization, polar functionalization, and chain scission irreversibly change bitumen’s initial composition. ,, …”

Section: Introductionmentioning

confidence: 99%

“…31−33 The degradation of bitumen under solar irradiation is attributed to the formation of free radicals that are produced by radiant energy such as UV. 34,35 Compared to thermal oxidation, UV exposure of bitumen causes a greater increase in carbonyl and sulfoxide compounds. 36,37 The formation of free radicals along with other mechanisms such as aromatization, carbonization, polar functionalization, and chain scission irreversibly change bitumen's initial composition.…”

Section: ■ Introductionmentioning

confidence: 99%

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Adsorbing Volatile Organic Compounds within Bitumen Improves Colloidal Stability and Air Quality

Mousavi

Aldagari

Fini

2023

ACS Sustainable Chem. Eng.

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The mass loss of bitumen due to volatilization is one of the deterioration mechanisms through which the chemical composition of bitumen deviates from its original condition, leading to change in the physical and rheological properties of bitumen. The emissions from bitumen not only accelerate its aging but also negatively impact air quality and consequently human health. Here, we characterized the molecular compositions of the volatiles emitted from bitumen in an isothermal aging process (150 °C for 24 h). We also investigated the impact of losing these compounds on the association behavior of asphaltene stacks. Based on the GC-MS results, the main mass loss of SARA (saturates, aromatics, resins, asphaltenes) fractions is attributed to the emission of lightweight nonpolar aromatic and aliphatic compounds. The most dominant volatiles are single-ring aromatics carrying short side chains, followed by saturated and unsaturated aliphatic compounds including short-chain n-alkanes, iso-alkanes, cyclic alkenes, alkenes, and dienes. Using molecular modeling in the framework of density functional theory (DFT), we showed how the reduction in aromatics and saturates can impact the colloidal stability of asphaltenes in the matrix of bitumen. Based on the DFT results, the surface adsorption of aromatics and saturates on asphaltene planes provides the steric repulsion required to maintain the asphaltene planes at a distance sufficient to inhibit their agglomeration. In addition, aromatic molecules with the least hindrance repulsion can disturb the π−π interfacial interactions between asphaltene planes, facilitating their deagglomeration. Therefore, a direct consequence of the mass loss of bitumen due to volatilization is disturbing the asphaltene distribution within the bitumen and stimulating the aggregation of asphaltenes. We also studied the merits of incorporating biochar into the bitumen surface to reduce bitumen's mass loss. Modification of bitumen separately with each of six biochars derived from biomass feedstocks (walnut shell, peanut shell, Douglas fir, pine bark, birch, and algae) showed the efficacy of each biochar to reduce the volatiles emitted from bitumen, thereby reducing the changes in the composition of maltene with consequent colloidal stability losses. The study outcomes highlight the importance of reducing emissions from bitumen to delay its aging and minimize negative impacts on air quality and human health.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Adsorbing Volatile Organic Compounds within Bitumen Improves Colloidal Stability and Air Quality

Mousavi

Aldagari

Fini

2023

ACS Sustainable Chem. Eng.

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“…Further work in this area could be devoted to evaluating the effects of ultraviolet aging [71][72][73] on the properties of asphalt binders with different additives used in WMA techniques, given it is a different and substantial mode of aging and a significant gap in this area persists [5].…”

Section: Discussionmentioning

confidence: 99%

The Combined Effects of Additives on the Conventional and High-Temperature Performance Properties of Warm Mix Asphalt Binders

Chomicz-Kowalska,

Bartos,

Maciejewski

et al. 2023

Materials

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The present study investigates the effects of the simultaneous use of two additives, an organosilane warm mix asphalt (WMA) agent and a grade-bumping polyolefin compound, on the conventional and high-temperature performance properties of a paving grade 50/70 bitumen and a polymer-modified 45/80-55 bitumen. The WMA agent and polyolefin additive were introduced to the binders at rates of up to 0.3% and 2%, respectively. The base asphalt binders and their blends with the additives were tested before and after aging in a rolling thin film oven test at a temperature of 143 °C. The effects of the investigated additives were found to be dependent on the type of base binder and its aging state. It was generally observed that the WMA additive decreased the performance of the asphalt binders and limited the effects of the other additive, which increased the high-temperature stiffness and non-recoverable compliance of the blends. This interaction amounted to as much as an approx. 20% decrease in high-temperature stiffness and non-recoverable compliance of the binders. The additives caused a small increase in the elasticity of the binders and improved their creep performance when measured in multiple stress creep recovery tests.

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“…Asphalt aging causes detrimental changes in physical properties by disturbing the balance among bitumen components, leading to destroying the bitumen’s colloidal structure . There are two main phenomena that disturb the bitumen’s colloidal structure and intensify asphaltene agglomeration during aging: mass loss and the formation of oxygen-containing functional groups such as carbonyl in the reactive bitumen fractions. − The volatile loss of small hydrocarbons starts at an early stage of asphalt aging and continues during aging, caused by heating, solar irradiation, or by free radicals generated by chain scission reactions due to UV irradiation. , These aging-related chemical changes cause changes in bitumen’s rheological and chemical properties that decrease asphalt’s durability. ,− …”

Section: Introductionmentioning

confidence: 99%

Cleaner Asphalt Production by Suppressing Emissions Using Phenolic Compounds

Pahlavan

Gholipour

Zhou

et al. 2023

ACS Sustainable Chem. Eng.

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Asphalt-paved surfaces have been reported as an important and long-lasting potential source of emissions of a complex mixture of volatile organic compounds into the atmosphere. Accelerated aging of asphalt under high temperatures and sunlight exposure is closely related to the mass loss due to asphalt-related emissions. This paper studies the capability of biomodifiers to retain oxygenated compounds in bitumen and thereby extend bitumen’s durability. It is hypothesized that phenolic compounds of biomodifiers enhance intermolecular interactions with oxygenated compounds that would otherwise be released to the atmosphere as bitumen ages. Computational modeling based on density functional theory (DFT) confirms the capability of phenolic compounds in bio-oil from wood pellets (WPs) as a modifier for bitumen to interact with bitumen’s volatile oxygenated compounds through strong hydrogen bonding. DFT-based energy results show that the efficacy of a phenolic molecule to trap bitumen’s oxygenated compounds is influenced by its molecular structure and substituents attached to the phenolic moiety; electron donor groups such as −CH3 and −OCH3 can enhance the scavenging activity of phenolic compounds. Molecular modeling also shows that the interacting complexes formed between bitumen’s oxygenated compounds and WP’s phenolic components are more thermodynamically favored than complexes formed by these volatiles and non-phenolic molecules in waste vegetable oil (WVO). Laboratory experiments confirm the delay in UV aging of biomodified rubberized bitumen containing wood-pellet bio-oil (WP-BMR) by showing lower values for aging indexes based on rheological properties (the crossover modulus and frequency, the complex modulus, activation energy, and a rutting indicator) compared to the rubberized bitumen containing a low-phenol WVO biomodifier (WVO-BMR). Therefore, the extent of aging varies between two biomodified bitumen samples depending on the biomodifier’s source and chemical composition. This study’s outcomes show how to improve the durability of asphalt by tuning bitumen’s aging resistance using phenol-rich biomodifiers made from lignin-based biomass. This can be a key to open a doorway to resource conservation and sustainability in the construction industry while maintaining or enhancing air quality.

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Influence of Ultraviolet and Oxygen Coupling Aging on Rheological Properties and Functional Group Index of Warm Mix Asphalt Binder

Cited by 20 publications

References 26 publications

Adsorbing Volatile Organic Compounds within Bitumen Improves Colloidal Stability and Air Quality

Adsorbing Volatile Organic Compounds within Bitumen Improves Colloidal Stability and Air Quality

The Combined Effects of Additives on the Conventional and High-Temperature Performance Properties of Warm Mix Asphalt Binders

Cleaner Asphalt Production by Suppressing Emissions Using Phenolic Compounds

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