Multi scale investigation on the failure mechanism of adhesion between asphalt and aggregate caused by aging

Ji, Xiaoping; Jia, Li; Zou, Haiwei; Hou, Yueqin; Chen, Bo; Jiang, Yingjun

doi:10.1016/j.conbuildmat.2020.120361

Cited by 33 publications

(7 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With the increase of ROS concentration, the average area of bee structures of BB increases from 0.77 to 2.30 μm 2 , while the average area of bee structures of HVMB grows from 0.56 to 1.22 μm 2 . Similar findings were found in the AFM studies by Kim and Ji. , The average area of bee structures of unaged HVMB is 72.72% of that of BB. After VBA aging at 10 g/m 3 ROS, the average area of bee structures of HVMB is only 53.04% of BB.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Microevolution of Polymer–Bitumen Phase Interaction in High-Viscosity Modified Bitumen during the Aging of Reactive Oxygen Species

Hofko

Sun

et al. 2023

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

The objective of this study is to investigate the microevolution of the bitumen microstructure, polymer phase, and polymer–bitumen interaction of high-viscosity modified bitumen (HVMB) in reactive oxygen species (ROS) aging using the Viennese binder aging (VBA) method. First, the VBA system was utilized to age HVMB with different ROS concentrations. Then, an optical inverse bright-field, dark-field, and fluorescence microscope (OIM) was used to observe the bitumen microstructure, its evolution, and polymer structure degradation of HVMB during ROS aging. Afterward, ImageJ software was applied to quantitatively assess the bee structure size characteristics of bitumen and the distribution characteristics of the polymer. Finally, the differences in the distribution features of bee structures in the polymer zone (PZ) and non-polymer zone (NPZ) were counted to understand the polymer–bitumen interaction during ROS aging. The results show that the existence of polymers affects the distribution state of bee structures in bitumen significantly. The area ratio of bee structures and the average area of bee structures in HVMB both progressively rise with an increase in ROS concentration, although both are much less than those in base bitumen (BB). The destruction of the polymer phase starts from the inside of polymers during ROS aging. As the ROS concentration increases, the polymer degrades from the intact network structure to isolated small molecules. Polymer–bitumen interactions are widespread in HVMB. A large number of bitumen bee structures are also present in the PZ of HVMB. Moreover, the bee structures considerably grow in the PZ as opposed to the NPZ during ROS aging. The clarification of these microstructural characteristics lays the foundation for a deeper comprehension of the aging mechanism of HVMB induced by ROS.

show abstract

Section: Resultsmentioning

confidence: 99%

“…Similar findings were found in the AFM studies by Kim and Ji. 44,45 The average area of bee structures of unaged HVMB is 72.72% of that of BB. After VBA aging at 10 g/m 3 ROS, the average area of bee structures of HVMB is only 53.04% of BB.…”

Section: ■ Materials and Methodsmentioning

confidence: 99%

Microevolution of Polymer–Bitumen Phase Interaction in High-Viscosity Modified Bitumen during the Aging of Reactive Oxygen Species

Hofko

Sun

et al. 2023

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…The asphalt binder has a homogeneous structure at the macro level. However, asphalt has a nonuniform structure at the micro level, which will change with aging and rejuvenation . The base asphalt binder has three micromorphologies: a bee-like structure, a bee-shell structure, and a continuous structure.…”

Section: Resultsmentioning

confidence: 99%

“…However, asphalt has a nonuniform structure at the micro level, which will change with aging and rejuvenation. 41 The base asphalt binder has three micromorphologies: a bee-like structure, a bee-shell structure, and a continuous structure. However, there is no obvious bee-shell structure in SBSMA, and it is only composed of bee-like structures and continuous structures.…”

Section: Acs Sustainablementioning

confidence: 99%

Development on the Rheological Properties and Micromorphology of Active Reagent-Rejuvenated SBS-Modified Asphalt

Shi

et al. 2022

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

This study aimed to improve the recycling efficiency of waste styrene−butadiene−styrene (SBS)-modified asphalt pavements and achieve sustainable road resource development. The SBS-modified asphalt aged in a pressure aging vessel (SBSPAV) was rejuvenated utilizing active reagents [i.e., methylene-bis(4-cyclohexylisocyanate) (HMDI) and 1,6-hexanediol diglycidyl ether (HDE)] and epoxy soybean oil (ESO). The HMDI type (HMDI combined with ESO) and HDE type (HDE combined with ESO) were used as rejuvenators. The rheological behavior of rejuvenated asphalt binders at medium and high temperatures was evaluated utilizing multiple stress creep recovery tests, linear amplitude sweep tests, and rotational viscosity tests. The high-temperature rutting resistance, medium-temperature fatigue resistance, and fluidity of the rejuvenated asphalt were evaluated. The micromorphology, roughness, and adhesion of the rejuvenated asphalt were evaluated by atomic force microscopy. The thermal stability of the rejuvenated asphalt was analyzed by thermogravimetric analysis. The results reveal that the HMDI-rejuvenated asphalt combines with the active hydrogen in SBSPAV to generate a stable chemical structure that benefits the rutting resistance and traffic load grade of the rejuvenated asphalt. Due to the increase in stiffness, the fatigue resistance of the HMDI-rejuvenated asphalt could be damaged to some extent. The residual epoxy functional groups in the HDE-rejuvenated asphalt are dispersed in the asphalt in an independent phase state, which reduces the elastic recovery ability. The stiffness of the rejuvenated asphalt is lowered because it has a more flexible structure. The anti-fatigue effectiveness of the HDE-rejuvenated asphalt is improved. HMDI can boost the intermolecular force of the rejuvenated asphalt while decreasing its temperature sensitivity. The viscosity of the rejuvenated asphalt gradually decreases as the HDE content increases. This occurs because HDE combines with SBSPAV to generate flexible segments, thereby increasing the flexibility of the asphalt colloids. HMDI and SBSPAV undergo a chemical reaction, which partially repairs the structure of SBS and inhibits the free diffusion of the asphalt molecules. The number of the HMDI-rejuvenated asphalt bee-like structures increases, while the volume drops and adhesion increases. The number and volume of the bee-like structures decreased and adhesion increased as the HDE content increased. This occurs because HDE contains a high concentration of light components, which minimizes the amount of asphaltene in SBSPAV. Thermogravimetric analysis tests show that the HDE-rejuvenated asphalt and HMDI-rejuvenated asphalt have good thermal stability.

show abstract

“…Rashid et al tested the stiffness, microstructure, and modulus of asphalt binder through AFM, and found that modulus and stiffness were associated with the asphalt microstructure [17]. Ji et al tested the microstructure and surface energy of asphalt and aggregates based on AFM and explored the relationship between asphalt binder surface energy and microstructure [18][19][20]. Some scholars have also studied the asphalt binder aging behavior, destructive behavior, and adhesion behavior through AFM.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Surface Micro-Mechanical Properties of Various Asphalt Binders Using AFM

et al. 2022

Self Cite

View full text Add to dashboard Cite

The microstructure of asphalt affects the micro-mechanical properties. In this study, atomic force microscopy (AFM) was used to investigate the surface elastic modulus and nanohardness of asphalt binder. Relevant mechanical indexes were quantitatively evaluated by contact mechanical model. Five types of asphalts, including different grades, oil sources, and before and after modification, were selected as test objects, and the effects of asphalt binder type, aging, water, and anti-stripping agent on the asphalt micromechanics were explored. The results showed that the micromechanical properties of asphalt binder are affected by grade, oil source, and modification. The aging resistance of modified asphalt binder is better than that of unmodified asphalt binder. Water immersion reduces the surface micromechanical properties of the asphalt binder. The effect of the anti-stripping agent on the modified asphalt binder is greater than that of the unmodified asphalt binder.

show abstract

Multi scale investigation on the failure mechanism of adhesion between asphalt and aggregate caused by aging

Cited by 33 publications

References 23 publications

Microevolution of Polymer–Bitumen Phase Interaction in High-Viscosity Modified Bitumen during the Aging of Reactive Oxygen Species

Microevolution of Polymer–Bitumen Phase Interaction in High-Viscosity Modified Bitumen during the Aging of Reactive Oxygen Species

Development on the Rheological Properties and Micromorphology of Active Reagent-Rejuvenated SBS-Modified Asphalt

Investigation of Surface Micro-Mechanical Properties of Various Asphalt Binders Using AFM

Contact Info

Product

Resources

About