Differential effects of ultraviolet radiation and oxidative aging on bio-modified binders

Hosseinnezhad, Shahrzad; Zadshir, Mehdi; Yu, Xiaokong; Yin, Huiming; Sharma, Brajendra K.; Fini, Elham H.

doi:10.1016/j.fuel.2019.04.029

Cited by 70 publications

(27 citation statements)

References 28 publications

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“…Advances in Materials Science and Engineering the carbonyl group index. is conclusion was proven by Hosseinnezhad et al, where the UV ageing affected the carbonyl group index of asphalt more than thermal ageing [49]. e base asphalt has the highest index after UV ageing.…”

Section: Discussionmentioning

confidence: 86%

Research on the Properties of Low Temperature and Anti‐UV of Asphalt with Nano‐ZnO/Nano‐TiO₂/Copolymer SBS Composite Modified in High‐Altitude Areas

Xie

Tao

Han

et al. 2020

Advances in Materials Science and Engineering

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Strong ultraviolet light and low-temperature are the typical environmental characteristics in high-altitude areas. The performance of SBS-modified asphalt in the above environmental characteristics needs further study. To improve the resistance ultraviolet (UV) ageing and low-temperature performance of copolymer- (SBS-) modified asphalt, an SBS-modified asphalt containing nano-ZnO and nano-TiO2 is proposed. In this paper, nano-ZnO, nano-TiO2, and SBS were used as modifiers with the silane coupling agent (KH-560) as the nanomaterial surface modification. The orthogonal test table was used to analyse the effects of the three modifiers on the physical properties of modified asphalt at different dosages. On this basis, the physical properties, low-temperature properties, and ageing indices (carbonyl index and sulfoxide index) were studied for base asphalt, SBS-modified asphalt, nano-ZnO/SBS-modified asphalt, and nano-ZnO/nano-TiO2/SBS composite-modified asphalt before and after photoaging. The content changes of characteristic elements (Zn and Ti) in the nano-ZnO/nano-TiO2/SBS composite-modified asphalt before and after ageing were studied by scanning electron microscopy with energy dispersive spectroscopy (SEM/EDS), and the UV ageing mechanism was revealed. The results indicate that two nanoparticles show the best compatibility with asphalt after surface modification and can improve the binding ability between SBS and base asphalt. The orthogonal test analysis shows that nano-ZnO has a highly significant effect on the low- and high-temperature performance of the nano-ZnO/nano-TiO2/SBS composite-modified asphalt, and nano-TiO2 has a significant effect on the high-temperature performance. Three optimal composite-modified systems for base asphalt including 4% nano-ZnO/1.5% nano-TiO2/3.2% SBS were proposed and had the best antiaging ability. Compared with the sulfoxide index, the carbonyl index changed most obviously before and after ageing. Additionally, the results reveal that nano-TiO2 has a good absorption effect at a wavelength of 365 nm (ultraviolet light), while nano-ZnO is liable to photolysis, and its activity decreases at this wavelength.

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Section: Discussionmentioning

confidence: 86%

Research on the Properties of Low Temperature and Anti‐UV of Asphalt with Nano‐ZnO/Nano‐TiO₂/Copolymer SBS Composite Modified in High‐Altitude Areas

Xie

Tao

Han

et al. 2020

Advances in Materials Science and Engineering

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“…However, when the aging depth increases to 100 μm, the N–H group peak, O–H group peak, and C–O group peak of HVMA disappear. This is because the reactive group chain is not broken due to the lack of solar radiation effect, and the participation of oxygen below 100 μm depth is not as full as that at the surface . This also shows that most of nitrogen atoms are acquired from the air and mainly combine with the hydrogen atoms at the surface of HVMA …”

Section: Resultsmentioning

confidence: 98%

“…For the deep layers, the participation of diffuse oxygen has been weakened significantly. Meanwhile, the content of reactive free radicals is reduced apparently due to the lack of solar radiation energy . Hence, the content of carbonyl functional groups decreases significantly.…”

Section: Resultsmentioning

confidence: 99%

Understanding the Aging Depth Gradient Distribution of High Viscosity Modified Asphalt under the Effect of Solar Radiation and Diffuse Oxygen

Sun

et al. 2021

ACS Sustainable Chem. Eng.

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The objective of this study was to investigate the aging depth gradient distribution of high viscosity modified asphalt (HVMA) under the effect of solar radiation and diffuse oxygen. The HVMA samples with different thicknesses were prepared to perform the weathering aging under different solar radiation intensities. Then, the Fourier transform infrared spectroscopy test, gel permeation chromatography test, and fluorescence microscopy test were used to study the chemical composition and micromorphology characteristic of HVMA at different aging depths. Afterward, the dynamic shear rheology test and multiple stress creep recovery test were applied to investigate the macroscopic rheological performance of HVMA. The test results showed that the effect of solar radiation aging diffused from the asphalt surface to the asphalt inside gradually. As the solar radiation intensity and aging time increased, the significant aging depth of HVMA increased continuously. At the surface, HVMA absorbed the solar light near the characteristic absorption band to activate the asphalt molecules and polymer molecules and had oxidation and depolymerization reactions with the full participation of diffuse oxygen. Simultaneously, HVMA also showed continuous microcracks at the surface due to the direct radiation of solar light. As the aging depth increased, the cracking phenomenon disappeared, and the asphalt oxidation rate and polymer degradation rate of HVMA decreased gradually. The increase of solar radiation intensity causes more severe aging at the surface and a faster downward propagation rate of aging effect, thus resulting in accelerated deterioration of the macroscopic rheological performance of HVMA.

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“…The authors found that a bitumen film with a thickness of 600 nm became stiffer and lost its viscoelasticity after 20 h of UV exposure performed in an accelerated UV chamber . In another study, bitumen was aged by exposure to combined oxidation and UV radiation, and the changes in the chemical and physical properties of the bitumen were measured; it was found that the aging process led to the formation of conjugated structures and increased the content of fused polyaromatic hydrocarbons . There is a consistent increase of the carbonyl content and loss of saturated hydrocarbons during aging of bitumen …”

Section: Introductionmentioning

confidence: 98%

“…15 Among the more recent anti-aging additives are biobased modifiers produced from animal manure, wood pellet, corn stover, and miscanthus; they were all shown to improve bitumen's resistance to UV aging when added at 10% dosage by weight of asphalt. 10 Furfural, an organic compound, was shown to improve asphalt's resistance to oxidative aging at a 2% dosage by weight of asphalt. 16 A biomodifier produced from animal waste lowered the viscosity-based aging index of oxidized aged asphalt up to 36% at a 5% dosage of biomodifier.…”

Section: Introductionmentioning

confidence: 99%

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

Rajib

Fini

2020

ACS Omega

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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.

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Differential effects of ultraviolet radiation and oxidative aging on bio-modified binders

Cited by 70 publications

References 28 publications

Research on the Properties of Low Temperature and Anti‐UV of Asphalt with Nano‐ZnO/Nano‐TiO₂/Copolymer SBS Composite Modified in High‐Altitude Areas

Research on the Properties of Low Temperature and Anti‐UV of Asphalt with Nano‐ZnO/Nano‐TiO₂/Copolymer SBS Composite Modified in High‐Altitude Areas

Understanding the Aging Depth Gradient Distribution of High Viscosity Modified Asphalt under the Effect of Solar Radiation and Diffuse Oxygen

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

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Differential effects of ultraviolet radiation and oxidative aging on bio-modified binders

Cited by 70 publications

References 28 publications

Research on the Properties of Low Temperature and Anti‐UV of Asphalt with Nano‐ZnO/Nano‐TiO2/Copolymer SBS Composite Modified in High‐Altitude Areas

Research on the Properties of Low Temperature and Anti‐UV of Asphalt with Nano‐ZnO/Nano‐TiO2/Copolymer SBS Composite Modified in High‐Altitude Areas

Understanding the Aging Depth Gradient Distribution of High Viscosity Modified Asphalt under the Effect of Solar Radiation and Diffuse Oxygen

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

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Research on the Properties of Low Temperature and Anti‐UV of Asphalt with Nano‐ZnO/Nano‐TiO₂/Copolymer SBS Composite Modified in High‐Altitude Areas

Research on the Properties of Low Temperature and Anti‐UV of Asphalt with Nano‐ZnO/Nano‐TiO₂/Copolymer SBS Composite Modified in High‐Altitude Areas