Rheological properties and microscopic mechanism of rock asphalt composite modified asphalts

Wen, Yankai; Guo, Ning; Wang, Lin; Jiao, Bozong; Li, Wei

doi:10.1016/j.conbuildmat.2021.122543

Cited by 15 publications

(4 citation statements)

References 24 publications

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“…The formation of the mesh structure is not favorable to the temperature sensitivity of asphalt. This is consistent with the findings of Wen Y et al [ 33 ].…”

Section: Resultssupporting

confidence: 94%

Performance Study of Waste PE-Modified High-Grade Asphalt

Zhang³

2023

Polymers

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In this work, waste polyethylene (PE)-modified 90# asphalt was made in order to investigate the performance of waste polyethylene-modified high-grade asphalt and the optimal blending quantity. Dynamic Shear Rheology (DSR) and Bending Beam Rheometer (BBR) tests were used to evaluate the high- and low-temperature performance of modified 90# PE-modified asphalt. Infrared spectroscopy and fluorescence microscopy were used to investigate the modification process and distribution status of waste PE in 90# asphalt. The DSR and BBR tests revealed that waste PE enhanced the high-temperature performance of 90# base asphalt and that 5% was the best blending rate. However, the change affects asphalt’s low-temperature performance, and the negative effect on asphalt’s low-temperature performance was minimized at 1% dosing. The incorporation of waste PE absorbed the light components of asphalt, while waste PE can form a reticulated structure in asphalt, which improves its high-temperature performance but degrades its low-temperature performance, according to the results of infrared spectroscopy and fluorescence microscopy.

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“…The formation of the mesh structure is not favorable to the temperature sensitivity of asphalt. This is consistent with the findings of Wen Y et al [ 33 ].…”

Section: Resultssupporting

confidence: 94%

Performance Study of Waste PE-Modified High-Grade Asphalt

Zhang³

2023

Polymers

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“…Reducing the RA content and increasing the CR content can significantly improve the fatigue resistance, extending its fatigue life by more than five times. Wen et al [148] report a study similar to the one described above. They modified an AC 89 pen with AR contents of 5, 10, and 12 wt%.…”

Section: Rock Asphalt (Ra)mentioning

confidence: 65%

Natural Asphalts in Pavements: Review

2023

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Natural asphalts (NAs) can be an economical and environmental alternative in pavement construction. Most studies have investigated them as binder and asphalt mixture modifiers due to their high compatibility with conventional asphalts. In this article, some of the studies carried out on the use of NA in pavements are summarized and described in a chronological order. The main aspects described in the reviewed studies were the type of asphalt binder or modified mixture, the type and content of the modifier, the manufacturing processes of the asphalt or modified mixture, tests performed, and main results or conclusions. In general terms, NAs show better performance as binder and asphalt mixture modifiers in high-temperature climates. Additionally, they tend to improve water and ageing resistance. As main limitations, it is reported that NAs tend to negatively affect the workability and performance of asphalt mixtures in low-temperature climates. Finally, recommendations for future study topics are provided at the end of this paper.

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“…Te TSM-400C fuorescence microscope is from Shanghai (Suzhou) Instrument Co., Ltd. Te TSM-400C fuorescence microscope was used to analyze the microscopic morphology of the modifed emulsifed asphalt through the fuorescence microscope structure diagram to study the dispersion of SBS and SBR modifers in the emulsifed asphalt [31,32].…”

Section: Fluorescence Microscopy Testmentioning

confidence: 99%

Composition and Performance Evaluation of SBS/SBR Modified Emulsified Asphalt for Tack Coat on Airport Pavement

Wang

Xie

et al. 2022

Advances in Materials Science and Engineering

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Asphalt concrete pavement is gradually being adopted in cement concrete pavement repair and paving due to its short construction period and low vibration to aircraft. However, the performance of the interlayer binder is the critical factor affecting the paving effect. For the preparation of interlayer high-performance emulsified asphalt suitable for airport pavement, the type and dosage of modifier and emulsifier were taken as factors and levels for the orthogonal test. Combined with the evaporation residue, softening point, penetration, ductility, and Engla viscosity indexes, the range analysis was carried out to determine the optimal dosage of modifier and emulsifier. Furthermore, the dynamic shear rheology test (DSR), fluorescence microscope test, TG-DSC test, and shear and tensile tests were used to evaluate the technical properties of SBS/SBR modified emulsified asphalt. These results showed that the best blending mass ratio of SBS/SBR modified emulsified asphalt is 1.5% SBS + 3% SBR + 1% emulsifier. Temperature sweep at 48°C, compared with SBS/SBR modified emulsified asphalt, the complex shear modulus (G ∗ ) of SBS/SBR modified emulsified asphalt increased by 71% and 75%, while the rutting factor(G ∗ /sinδ) increased by 83% and 86%, respectively, which indicates that its shear deformation resistance and rutting resistance have been significantly improved. The Han curve indicates that the SBS/SBR modifier has excellent compatibility with asphalt and can maintain a stable state at a lower frequency. Before demulsification, SBS/SBR modifier and emulsified asphalt formed a stable spatial network structure. After demulsification, the continuous phase and the dispersed phase were more closely integrated, so that the emulsified asphalt exhibited better bonding performance. At different temperatures, by increasing the spraying volume, the shear and tensile strength of SBS/SBR modified emulsified asphalt increased first and then decreased. At 25°C, the maximum shear and tensile strengths are 0.86 MPa and 0.65 MPa. This study demonstrated that SBS/SBR modified emulsified asphalt formed a stable spatial network structure, giving it excellent technical properties, and can be widely used for tack coat on airport pavement.

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Rheological properties and microscopic mechanism of rock asphalt composite modified asphalts

Cited by 15 publications

References 24 publications

Performance Study of Waste PE-Modified High-Grade Asphalt

Performance Study of Waste PE-Modified High-Grade Asphalt

Natural Asphalts in Pavements: Review

Composition and Performance Evaluation of SBS/SBR Modified Emulsified Asphalt for Tack Coat on Airport Pavement

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