Research on the aging and rejuvenation mechanisms of asphalt using atomic force microscopy

Chen, Anqi; Liu, Guoqiang; Zhao, Yongli; Li, Jing; Pan, Yuanyuan; Zhou, Jian

doi:10.1016/j.conbuildmat.2018.02.008

Cited by 117 publications

(38 citation statements)

References 28 publications

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“…This process shows that the penetration and the softening point is better. Among the four UV aging modes, the changes in the penetration and softening points of the asphalt after aging in acid and salt media are greater than those in the water medium [ 40 ]. This phenomenon shows that water accelerates the UV aging of asphalt and the cracking of rubber powder, and acid or salt components further accelerate the aging and cracking process.…”

Section: Resultsmentioning

confidence: 99%

Influence of Different Aging Environments on Rheological Behavior and Structural Properties of Rubber Asphalt

2020

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Research on asphalt aging properties mainly focuses on temperature and ultraviolet (UV) radiation, while water, acid and salt media in natural environment are often ignored. According to the aging simulation of self-made UV environment chamber, the influence of the coupling effect of different media and UV radiation on rubber asphalt properties was analyzed through physical properties, rheological properties and micro characteristics, and the structural properties of asphalt were revealed. The results indicated that different media can accelerate the aging of rubber asphalt. The penetration, creep rate and non-recoverable creep compliance of asphalt decreased, while the softening point, rutting factor, recoverable rate, fatigue factor and stiffness modulus increased. The coupling effect between acid and UV radiation had the most impact on asphalt rutting and fatigue cracking. The rubber asphalt performed better at high-temperature after aging, and it was more prone to fatigue damage and performed worse at low-temperature. Through the oxygen absorption reaction causing asphalt aging, the intensity of the absorption peaks of the carbonyl and sulfoxide groups increased and the light components of the asphalt transitioned to heavy components under UV radiation. These media intensified this process, which resulted in the gradual transformation of the asphalt colloid structure into a gel type. The carbon black contained in the waste rubber powder made the rubber asphalt exhibit better anti-aging properties.

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Section: Resultsmentioning

confidence: 99%

Influence of Different Aging Environments on Rheological Behavior and Structural Properties of Rubber Asphalt

2020

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“…Multimode PicoForce type AFM (Thermo Fisher, Waltham, MA, USA) is used to observe the topography of asphalt surfaces before and after UV aging [31]. Each asphalt sample was heated to a melted state and dropped on a 10 × 10 mm 2 glass slide.…”

Section: Atomic Force Microscopymentioning

confidence: 99%

The Effect of Waste Engine Oil and Waste Polyethylene on UV Aging Resistance of Asphalt

et al. 2020

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Waste engine oil (WEO) and waste polyethylene (WPE) are two common wastes, which are easy to pollute the environment. As the primary material in road construction, natural asphalt is a non-renewable energy source and asphalt is vulnerable to ultraviolet (UV) radiation during the service life. It results in degradation of asphalt pavement performance. In this paper, 2 wt % to 8 wt % of WEO and WPE were used to modify asphalts and the UV aging simulation experiment was carried out. The physical parameters of asphalts before the UV aging experiment show that the asphalt containing 4 wt % WPE and 6 wt % WEO mixture (4 wt % WPE + 6 wt % WEO) has similar physical properties with that of the matrix asphalt. Besides, gel permeation chromatography (GPC) verifies that the molecular weight distribution of the asphalt containing 4 wt % WPE + 6 wt % WEO is close to that of the matrix asphalt. The storage stability test shows that 4 wt % WPE + 6 wt % WEO has good compatibility with the matrix asphalt. The functional groups and micro-morphology of asphalts before and after the UV aging experiment were investigated by Fourier transform infrared spectroscopy (FTIR) and atomic force microscopy (AFM). FTIR results display that 4 wt % WPE + 6 wt % WEO can effectively reduce the formation of carbonyl and sulfoxide functional groups. AFM shows that 4 wt % WPE + 6 wt % WEO can also retard the formation of a "bee-like" structure in asphalt after the UV aging experiment. Based on the above results, it can be concluded that WEO and WPE mixture can replace part of asphalt and improve the UV aging resistance of asphalt.

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“…Atomic force microscopy is an excellent means of studying the surface microstructures of asphalt. It has been widely used in recent years due to its provision of three-dimensional imaging, as well as its capabilities of evaluating roughness and adhesion [34,40,48].…”

Section: Atomic Force Microscopymentioning

confidence: 99%

“…Additionally, AFM is a method used to study the performance of an asphalt binder at the microscale [25,38,39]. Recently, it has been widely used due to its provision of three-dimensional imaging, as well as its ability to evaluate roughness and adhesion [34,40]. e interactions between the AFM tip and asphalt can be used to simulate the bonds between the aggregates and asphalt binders [34].…”

Section: Introductionmentioning

confidence: 99%

Effect of Nanoclays on Moisture Susceptibility of SBS‐Modified Asphalt Binder

Wang

Guo

Yang

et al. 2020

Advances in Materials Science and Engineering

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Moisture susceptibility plays an important role in the damage of asphalt pavement. Failure occurs when asphalt is removed from the aggregate particles due to the decreased adhesion between the asphalt and aggregate in comparison with that between water and the aggregate. In recent years, efforts utilizing nanomaterials to improve the diverse properties of asphalt have proven to be effective. In this study, three types of nanoclays were used to modify styrene-butadiene-styrene- (SBS-) modified asphalt. The resistances to water damage of the modified binders were evaluated using the surface free energy (SFE) and atomic force microscopy (AFM). The results revealed that the total SFE decreased and the energy ratio (ER) increased when the asphalt binder was modified with the nanoclays, indicating that the addition of nanoclays can improve the moisture resistance of these aggregate-binder systems. After immersion, a decreased amount of bee structures was observed in both the SBS and nanoclay-modified asphalts due to the interactions between water and bitumen. However, the residual amount of bee structures was higher in the nanoclay-modified asphalts than in the SBS-modified asphalt, indicating that the addition of nanoclay makes the surface morphology of asphalt more resistant to water damage. Finally, freeze-thaw splitting tests were used to verify the results obtained through the SFE and AFM tests.

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Research on the aging and rejuvenation mechanisms of asphalt using atomic force microscopy

Cited by 117 publications

References 28 publications

Influence of Different Aging Environments on Rheological Behavior and Structural Properties of Rubber Asphalt

Influence of Different Aging Environments on Rheological Behavior and Structural Properties of Rubber Asphalt

The Effect of Waste Engine Oil and Waste Polyethylene on UV Aging Resistance of Asphalt

Effect of Nanoclays on Moisture Susceptibility of SBS‐Modified Asphalt Binder

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