Dispersion, compatibility, and rheological properties of graphene-modified asphalt binders

Wang, Yanhai; Polaczyk, Pawel; He, Junxi; Lu, Hang; Xiao, Rui; Huang, Baoshan

doi:10.1016/j.conbuildmat.2022.128886

Cited by 27 publications

(4 citation statements)

References 43 publications

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“…It is worthwhile to measure the level of GnP dispersion in asphalt binder, though this measurement is extremely challenging and there are very few reports in the literature in this respect. For example, Wang et al [34] used optical microscopy and 2D image processing to determine the GnP dispersion in asphalt binder. However, the reliability of this analysis becomes uncertain at lower GnP concentrations, and, therefore, no measurements were made of the level of GnP dispersion in the asphalt binders in this work.…”

Section: Rotational Viscositymentioning

confidence: 99%

Effects of the geometric characteristics of graphene nanoplatelets on the physico-rheological properties of asphalt binder

Almashaqbeh,

Rushing,

Doyle

et al. 2024

Mater Struct

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While graphene nanoplatelets (GnPs) have emerged as promising nano-modifiers of asphalt binder in recent years, much is still unknown in terms of the existing correlations between the physical, chemical, and geometric characteristics of this nanofiller and observed asphalt binder properties. In this work, we investigate the important correlation between the geometric characteristics of GnPs and the rheological properties of the GnP-modified asphalt binder at high temperatures. Our results indicate that, in general, incorporating GnPs with large mean particle diameters (> 14 μm) and thicknesses (> 8 nm) enhances the high-temperature performance of the asphalt binder. The results of the multiple stress creep and recovery tests confirm that including GnPs in asphalt binder can decrease its permanent deformation by 33.2% and enhance its elastic recovery by 53.9%. Phase contrast images obtained by atomic force microscopy further indicate that the presence of GnPs with large mean particle diameters alters the morphology of the asphalt binder, leading to improved temperature stability and less susceptibility to permanent deformation.

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Section: Rotational Viscositymentioning

confidence: 99%

Effects of the geometric characteristics of graphene nanoplatelets on the physico-rheological properties of asphalt binder

Almashaqbeh,

Rushing,

Doyle

et al. 2024

Mater Struct

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“…The optimization of polymer dispersion in the preparation process directly influences the overall performance of SBS-modified asphalt [27,28]. Therefore, polymer dispersion is a critically important consideration.…”

Section: Authormentioning

confidence: 99%

Research on the Preparation Process of SBS-Modified Asphalt Using Early Shearing Instead of High-Speed Shearing of Modifier

Wang,

Yi,

Cui

et al. 2023

Applied Sciences

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To investigate the effect of pre-shredding as a replacement for high-speed shearing in the preparation process of SBS-modified asphalt, the particle size and mixing time of pre-shredded SBS modifier were studied. Laser confocal microscopy was used to observe the morphological changes and dispersion state of the SBS modifier during the mixing process, and process parameters were determined through rheological performance tests. FTIR tests were conducted on the original asphalt and PAV-aged modified asphalt to assess the impact of the pre-shredding process on the chemical composition and aging resistance of the modified asphalt. The specific conclusions were as follows. During the preparation process of the SBS modifier using low-speed mixing, the morphological changes of the SBS modifier can be summarized as follows: It cycles through edge networking, mesh fiberization, and filamentous granulation, and eventually presents a granular atomization form after multiple cycles. It is recommended that the mixing time be maintained between 30 and 60 min, which results in the microstructure of the modified asphalt consisting of filamentous and point-like combinations. This asphalt exhibited excellent performance in high-temperature rut resistance, fatigue resistance, and low-temperature crack resistance. When the mixing time was too long, the SBS modifier formed small granules in an atomized state, which weakened the strength of the mesh structure and led to a decrease in overall performance. It is recommended that the SBS be shredded into particles sized between 18 and 30 mesh or 30 and 100 mesh. SBS-modified asphalt with SBS particles sized between 18 and 30 mesh exhibited greater hardness in the mesh structure, resulting in better high-temperature rut resistance. SBS-modified asphalt with SBS particles sized between 30 and 100 mesh had better extensibility in the mesh structure, leading to superior performance in medium-temperature fatigue resistance and low-temperature crack resistance. Compared to the conventional process, the pre-shredding process for preparing SBS-modified asphalt improved aging resistance by 10% to 13%. Additionally, SBS-modified asphalt prepared using the pre-shredding process saved 1 to 3 h of processing time compared to the traditional preparation method, reducing energy consumption. Furthermore, the asphalt produced through the new process exhibited better performance, reducing road wear and saving maintenance costs.

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“…At present, modified asphalt technologies, such as SBS modification, rubber powder modification, graphene modification, and composite modification have been rapidly developed. Modified asphalt technology can improve the water damage resistance, as well as the high and low temperature performances of asphalt [6][7][8]; however, there are still issues regarding temperature stability and durability [9,10]. Epoxy asphalt has the characteristics Polymers 2023, 15, 2327 2 of 18 of a thermosetting material, with excellent strength, stiffness, durability, and temperature stability, but there are limitations in terms of its high price, harsh construction conditions, and insufficient toughness [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Preparation Scheme Optimization of Thermosetting Polyurethane Modified Asphalt

Sun

Jing

Weng³

et al. 2023

Polymers

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To solve the issue of the poor temperature stability of conventional modified asphalt, polyurethane (PU) was used as a modifier with its corresponding curing agent (CA) to prepare thermosetting PU asphalt. First, the modifying effects of the different types of PU modifiers were evaluated, and the optimal PU modifier was then selected. Second, a three-factor and three-level L9 (33) orthogonal experiment table was designed based on the preparation technology, PU dosage, and CA dosage to prepare the thermosetting PU asphalt and asphalt mixture. Further, the effect of PU dosage, CA dosage, and preparation technology on the 3d, 5d, and 7d splitting tensile strength, freeze-thaw splitting strength, and tensile strength ratio (TSR) of the PU asphalt mixture was analyzed, and a PU-modified asphalt preparation plan was recommended. Finally, a tension test was conducted on the PU-modified asphalt and a split tensile test was performed on the PU asphalt mixture to analyze their mechanical properties. The results show that the content of PU has a significant effect on the splitting tensile strength of PU asphalt mixtures. When the content of the PU modifier is 56.64% and the content of CA is 3.58%, the performance of the PU-modified asphalt and mixture is better when prepared by the prefabricated method. The PU-modified asphalt and mixture have high strength and plastic deformation ability. The modified asphalt mixture has excellent tensile performance, low-temperature performance, and water stability, which meets the requirements of epoxy asphalt and the mixture standards.

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Dispersion, compatibility, and rheological properties of graphene-modified asphalt binders

Cited by 27 publications

References 43 publications

Effects of the geometric characteristics of graphene nanoplatelets on the physico-rheological properties of asphalt binder

Effects of the geometric characteristics of graphene nanoplatelets on the physico-rheological properties of asphalt binder

Research on the Preparation Process of SBS-Modified Asphalt Using Early Shearing Instead of High-Speed Shearing of Modifier

Preparation Scheme Optimization of Thermosetting Polyurethane Modified Asphalt

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