Accelerated Aging of Asphalt by UV Photo-Oxidation Considering Moisture and Condensation Effects

He, Xin; Hochstein, Daniel; Ge, Qi; Chen, Fangliang; Yin, Huiming

doi:10.1061/(asce)mt.1943-5533.0002120

Cited by 34 publications

(15 citation statements)

References 37 publications

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“…Another open question is the role oxygen or water plays in UV aging. A previous study suggested that the oxygen uptake in UV-aged bitumen films was slowed by periodic exposure to water . One possibility is that UV light generates reactive free radicals in bitumen, but if water is present on the surface, some of these free radicals could diffuse out of the film into the water and be harmlessly neutralized.…”

Section: Resultsmentioning

confidence: 99%

“…However, real pavement is also exposed to water and sunlight, and these environmental factors may result in different chemical changes. − Elucidating the effects of ultraviolet (UV) radiation is especially important for regions of the world at high altitude, at low latitude, or with excessively sunny climates. At early stages of aging, UV irradiation of fresh bitumen tends to produce oxidation products similar to those of thermal agingtypically carbonyls and sulfoxidesbut at a much faster rate. − With longer exposure time, UV light can break chemical bonds and initiate reactions that are otherwise unlikely to proceed at standard PAV conditions, yielding chemical products different from those of thermal aging. ,− Some of this variation may arise from differences in UV absorptivity between different bitumen fractions . Another distinction between UV and PAV aging is that PAV aging is performed at elevated gas pressure; this may drive abnormally high oxygen concentrations into bitumen over extended time, whereas UV weathering tests show that oxygen concentrations in bitumen can level off quickly. , UV-catalyzed ketone photolysis reactions known as Norrish reactions are an important mechanism in the photodegradation of polymers − that can result in either chain scission or excision of the ketone as carbon monoxide.…”

Section: Introductionmentioning

confidence: 99%

“…10 Another distinction between UV and PAV aging is that PAV aging is performed at elevated gas pressure; this may drive abnormally high oxygen concentrations into bitumen over extended time, 15 whereas UV weathering tests show that oxygen concentrations in bitumen can level off quickly. 7,8 UVcatalyzed ketone photolysis reactions known as Norrish reactions are an important mechanism in the photodegradation of polymers 16−18 that can result in either chain scission or excision of the ketone as carbon monoxide. This mechanism may be an important factor in regulating oxygen concentration and driving volatile mass loss in UV-aged bitumen.…”

Section: ■ Introductionmentioning

confidence: 99%

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Evolution of Morphological and Nanomechanical Properties of Bitumen Thin Films as a Result of Compositional Changes Due to Ultraviolet Radiation

Hung

Kazembeyki

Hoover

et al. 2019

ACS Sustainable Chem. Eng.

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This paper examines morphological and nanomechanical changes as compositional evolution occurs because of ultraviolet (UV) radiation in thin films of bituminous adhesives. Such an insight is important for developing strategies to enhance sustainable applications of such adhesives for coating and composite manufacturing. However, the shallow penetration depth of UV light in bitumen complicates efforts to isolate its effects. To address this question, this study examined the effects of UV exposure on spin-coated films of bitumen that are 600 nm thick. Bitumen thin films were UV-aged in an accelerated weathering machine and were characterized by scanning electron microscopy, atomic force microscopy, Fourier transform infrared spectroscopy, energy-dispersive X-ray spectroscopy, UV–visible absorption spectroscopy, and nanoindentation. As UV radiation continued from 0 to 400 h, the hydrocarbon content of thin films gradually decreased, leaving behind sulfates and carbonyls and reducing bitumen solubility in organic solvents. This in turn led the bitumen thin films to become thinner and chemically and morphologically more heterogeneous. Nanoindentation showed a dramatic increase in stiffness and loss of viscoelasticity after 20 h of UV exposure. Stiffness continued to increase up to 50 h and nearly reached a plateau. The study results provide insights into the effects of UV radiation on structure–property changes in bitumen thin films, explaining how UV exposure causes rapid embrittlement and failure in bituminous adhesives, coatings, and composites. This in turn enables the design of sustainable bituminous composites with enhanced resistance to UV aging.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Evolution of Morphological and Nanomechanical Properties of Bitumen Thin Films as a Result of Compositional Changes Due to Ultraviolet Radiation

Hung

Kazembeyki

Hoover

et al. 2019

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

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“…Xiangbing Xie [14] High pressure mercury lamp (UV) 200 W/m 2 35 • C Liping Liu [15] High pressure mercury lamp (Reflection type black) 3.4 × 10 4 µW/m 2 40 • C Y.T. Wu [16] High pressure mercury lamp (Reflection type black) 400 W/m 2 50 • C Zhaoyi He [17] High pressure mercury lamp (UV) 40 W/m 2 70 • C He Xie [18] Fluorescent UV lamps 0.89 W/m 2 ·nm 45 • C Mouillet Virginie [19] Fluorescent UV lamps 0.72 W/m 2 /nm 45 • C Wenbo Zeng [20] High pressure mercury lamp (UV) 500 µW/m 2 30 • C 50 • C 70 • C From the perspective of composite materials, an asphalt mixture is composed of an asphalt mortar with viscoelastic properties and aggregates that form the skeletal structure [2]. The aging resistance of asphalt mixtures mainly depends on the asphalt mortar, which is composed of asphalt, mineral powder, and an interfacial phase formed in the contact zone between the two [21,22].…”

Section: Light Sources Uv Intensity Temperaturementioning

confidence: 99%

Influence of the Mineral Powder Content on the Asphalt Aging Resistance in High-Altitude Areas Based on Indoor Ultraviolet Light Tests

Xie

Duan

et al. 2020

Materials

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Intense ultraviolet irradiation is an important environmental factor affecting the service performance of asphalt mixtures in high-altitude areas, and the asphalt mortar is the main factor affecting the durability of asphalt mixtures. It is of great theoretical significance and engineering value to study the performance of the asphalt mortar at medium and low temperatures under ultraviolet irradiation. Therefore, this paper focuses on the evolution of the effect of the filler content on the rheological properties of different asphalt materials at low and medium temperatures under quantitative UV irradiation. Taking the average amount of UV irradiation observed annually in Northwest China as the indoor aging condition, the matrix asphalt mortar and modified asphalt mortar with different mass ratios of asphalt mortar are selected for indoor aging tests. Physical property tests, low-temperature performance tests, and dynamic shear rheological tests are carried out. The effects of the UV irradiation intensity and mineral powder content on the low temperature performance of the asphalt mortar are studied by variance analysis method, and the reasonable mass ratio range of the asphalt mortar under UV irradiation is proposed based on the standard residual square sum (STRSS) method. The results show that the temperature sensibility and low-temperature deformation energy significantly decrease with the increase in the filler content, while the values of the softening point, fatigue factor (G*sin δ), and creep stiffness modulus of the asphalt mortar increase. In addition, the variance analysis of the creep stiffness modulus aging index (SAI) shows that the ultraviolet radiation intensity has a significant impact on the performance of the asphalt mortar. When the mineral powder content is less than 40%. When the filler content is greater than 40%, the filler content effects the performance of the asphalt mortar. According to the standard residual square sum (STRSS) method, the best mass ratio of the base asphalt mortar is 1.096, and the best mass ratio of the modified asphalt mortar is 0.9091.

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“…Ultraviolet (UV) aging mainly occurs on the surface of asphalt. Photo-oxidation aging has a significant effect on the performance of asphalt at a depth of 3 µm, which gradually decreases with the increase of asphalt film thickness [19]. Macroscopically, the degree of penetration, ductility decrease, viscosity, and softening point increase.…”

Section: Introductionmentioning

confidence: 99%

Influence of Ultraviolet Aging on Adhesion Performance of Warm Mix Asphalt Based on the Surface Free Energy Theory

Wang

Ren

et al. 2019

Applied Sciences

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To explore the effect of ultraviolet (UV) aging on the adhesion properties of warm mix asphalt (WMA), WMA binders were prepared by adding Evotherm M1 and Sasobit into base asphalt. The base asphalt and two WMA binders were aged using a self-made UV aging box after a rolling thin-film oven test (RTFOT). As a comparison, pressure aging vessel (PAV) tests were performed for asphalt binders after RTFOT. The contact angles between the WMA binder and distilled water, glycerol, and formamide, before and after UV aging, were measured using the sessile drop method. On the basis of the surface free energy (SFE) theory, the SFE and its components, cohesion work, adhesion work, peeling work, and compatibility rate, before and after the UV aging of WMA, were obtained. The results show that the contact angle between WMA and water gradually increases with the degree of UV aging, which indicates that the aging increases the hydrophobicity of asphalt. After the RTFOT aging, UV aging at different times, and PAV aging, the SFE and its component, as well as cohesion work for all asphalt binders were reduced. The attenuation was severe after UV aging, followed by PAV aging and RTFOT aging. With the extension of UV aging time, the adhesion work, hot mix asphalt, and limestone aggregate compatibility rate gradually reduced, the peeling work increased, and the overall adhesion performance became poor. Under the aging effect of RTFOT and PAV, the Evotherm M1 WMA had the strongest anti-peeling ability, better compatibility, and the best adhesion. When the UV aging time of Sasobit WMA reached 100 h, the adhesion performance increased.

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Accelerated Aging of Asphalt by UV Photo-Oxidation Considering Moisture and Condensation Effects

Cited by 34 publications

References 37 publications

Evolution of Morphological and Nanomechanical Properties of Bitumen Thin Films as a Result of Compositional Changes Due to Ultraviolet Radiation

Evolution of Morphological and Nanomechanical Properties of Bitumen Thin Films as a Result of Compositional Changes Due to Ultraviolet Radiation

Influence of the Mineral Powder Content on the Asphalt Aging Resistance in High-Altitude Areas Based on Indoor Ultraviolet Light Tests

Influence of Ultraviolet Aging on Adhesion Performance of Warm Mix Asphalt Based on the Surface Free Energy Theory

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