Rheological properties, microstructure and aging resistance of asphalt modified with CNTs/PE composites

Xue, Xin; Yao, Zhenqiang; Jian, Shi; Liang, Ming; Jiang, Hongguang; Zhang, Jizhe; Zhang, Xiaomeng; Yao, Kai

doi:10.1016/j.conbuildmat.2020.120100

Cited by 39 publications

(32 citation statements)

References 22 publications

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“…The results indicated that CNT acted as compatibility activators between bitumen and linear SBS, whereas benefits of modification were jeopardized in blends prepared with CNTs and radial SBS. Our previous studies indicated that premixed CNTs/PE composites benefits for the low temperature cracking resistance and has the good anti-aging performance [22]. However, the current few studies did not deeply illustrate the interaction of polymer/CNT modified asphalt from the viewpoint of morphology, property, and field performance.…”

Section: Introductionmentioning

confidence: 77%

Investigating the Rheological Properties of Carbon Nanotubes/Polymer Composites Modified Asphalt

Liang

et al. 2020

Materials

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The utilization of nanomaterials in the field of binder materials for road paving has attracted researchers’ attention in recent years. This study presented the performance properties of a binder modified with carbon nanotubes (CNT) and polyethylene (PE). The rheological properties, adhesion behavior, morphology, and storage stability of the modified asphalt were investigated. Experimental analysis indicated a positive effect of CNT/PE composites on the performance of the binder. The results indicate that the combined use of CNT and PE shows a significant enhancement on complex modulus, viscosity, and creep recovery of the binder at high temperatures and a great decrease in compliance, indicating great resistance to permanent deformation. Meanwhile, only using CNT to improve the high temperature performance of the binder is limited due to high shear mixing. CNT/PE modifiers enhance the cracking resistance at low temperatures and moisture damage resistance. The CNT/PE melt mixing composites endow asphalt with stronger cracking resistance, better resistance to moisture damage and workability. Asphalt with CNT/PE composites formed an even dispersion system. Notably, CNT bridges on the interface between PE phase and asphalt for the two modified asphalts, which reinforces the cohesion of interface. Asphalt with CNT/PE composites showed improved storage stability in comparison with PE modified asphalt.

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Section: Introductionmentioning

confidence: 77%

Investigating the Rheological Properties of Carbon Nanotubes/Polymer Composites Modified Asphalt

Liang

et al. 2020

Materials

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“…To improve the storage stability of PE-modified asphalt, many additives have been employed [11,12], the most popular of which is carbon nanotubes (CNTs) [13,14]. A CNT, a carbon nanomaterial of wide interest, is a tubular one-dimensional (1D) material com-posed of carbon atoms with excellent thermodynamic properties, mechanical strength and specific surface area [15,16].…”

Section: Introductionmentioning

confidence: 99%

“…When CNTs are added to the PE-modified asphalt matrix, their special pull-out effect has a significant strengthening effect on the weak interface between PE and asphalt, which, in turn, improves the storage stability and high-temperature performance of the modified asphalt [17,18]. Previous studies have focused on the enhancement effect of CNT on PE-modified asphalt [14]; however, the microscopic mechanism underlying this phenomenon is not well understood, which is not conducive to the directional design of modified asphalt properties.…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Storage Stability Property of Carbon Nanotube/Recycled Polyethylene-Modified Asphalt Using Molecular Dynamics Simulations

Yang

Wang

et al. 2021

Polymers

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Carbon nanotubes (CNTs) can improve the storage properties of modified asphalt by enhancing the interfacial adhesion of recycled polyethylene (RPE) and base asphalt. In this study, the interaction of CNT/RPE asphalt was investigated using molecular dynamics simulation. The base asphalt was examined using a 12-component molecular model and verified by assessing the following properties: its four-component content, elemental contents, radial distribution function (RDF) and glass transition temperature. Then, the adhesion properties at the interface of the CNT/RPE-modified asphalt molecules were studied by measuring binding energy. The molecular structural stability of CNTs at the interface between RPE and asphalt molecules was analyzed through the relative concentration distribution. The motion of molecules in the modified asphalt was studied in terms of the mean square displacement (MSD) and diffusion coefficient. The results showed that CNTs improved the binding energy between RPE and base asphalt. CNTs not only weakened the repulsion of RPE with asphaltenes and resins, but also promoted the interaction of RPE with light components, which facilitated the compatibility of RPE with the base asphalt. The change in the interaction affected the molecular motion, and the molecular diffusion coefficient in the CNT/RPE-modified asphalt system was significantly smaller than that of RPE-modified asphalt. Moreover, the distribution of the asphaltene component was promoted by CNTs, resulting in the enhancement of the storage stability of RPE-modified asphalt. The property indexes indicated that the storage stability was significantly improved by CNTs, and better viscoelastic properties were also observed. Our research provides a foundation for the application of RPE in pavement engineering.

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“…However, the addition of a large percentage of GNPs into asphalt can significantly increase the cost of construction due to the complicated production process. Some researchers have observed that the combination of polymers and graphene for asphalt modification greatly enhanced the road performance of asphalt binders due to the excellent small particle size of graphene, which enables it to easily mix and is more compatible with asphalt [15]. Composite graphene/polymer modification has commonly been more cost effective because they decrease the amount of polymer and graphene material while enhancing the compatibility of the polymer with the asphalt [1].…”

Section: Introductionmentioning

confidence: 99%

Rheological Properties of Graphene/Polyethylene Composite Modified Asphalt Binder

Zhou

Dou²,

Chen

2021

Materials

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Aiming to improve the comprehensive road performance of asphalt binders, especially the high-temperature performance, a novel asphalt binder was prepared by compounding high-quality and low-cost polyethylene (PE) with graphene (GNPs) using a high-speed shearing machine. The rheological properties and interaction mechanism of PE/GNPs composite modified asphalt were investigated using temperature sweep (TeS), multiple stress creep recovery (MSCR), linear amplitude sweep (LAS) and Fourier transform infrared spectroscopy (FT-IR) and field emission scanning electron microscopy (FESEM). The experimental results demonstrated that GNPs and PE can synergistically improve the high-temperature performance of asphalt binders and enhance the rutting resistance of pavements; the pre-blended PE/GNPs masterbatch has good medium-temperature fatigue and low-temperature cracking resistance. Meanwhile, PE/GNPs dispersed uniformly in the asphalt matrix, and the microstructure and dispersion of premixed PE/GNPs masterbatch facilitated the asphalt modification. No new absorption peaks appeared in the FT-IR spectra of the composite modified asphalt, indicating that asphalt binders were physically modified with GNPs and PE. These findings may cast light on the feasibility of polyethylene/graphene composite for asphalt modification.

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Rheological properties, microstructure and aging resistance of asphalt modified with CNTs/PE composites

Cited by 39 publications

References 22 publications

Investigating the Rheological Properties of Carbon Nanotubes/Polymer Composites Modified Asphalt

Investigating the Rheological Properties of Carbon Nanotubes/Polymer Composites Modified Asphalt

Analysis of the Storage Stability Property of Carbon Nanotube/Recycled Polyethylene-Modified Asphalt Using Molecular Dynamics Simulations

Rheological Properties of Graphene/Polyethylene Composite Modified Asphalt Binder

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