Effect of Nanoadditives on Bitumen Aging Resistance: A Critical Review

Filippi, Sara; Cappello, Miriam; Mercé, Manuel; Polacco, Giovanni

doi:10.1155/2018/2469307

Cited by 31 publications

(16 citation statements)

References 138 publications

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“…But their use in bituminous mixes still has many aspects to be clarified and optimized. The first problem is the lack of univocal procedures that makes it difficult to compare data coming from different laboratories [81].…”

Section: Discussionmentioning

confidence: 99%

Behavior Evaluation of Bituminous Mixtures Reinforced with Nano-Sized Additives: A Review

Fusco¹,

Moretti²,

Fiore³

et al. 2020

Sustainability

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This article presents a comparative review of the most commonly used nano-additives for bituminous mixtures: nanoclays (NC), nanosilicates, carbon nanotubes (CNTs), graphene nanoplatelets (GNPs), nano-calcium oxide (CaO), and nano-titanium dioxide (TiO2). In this study, the mechanical behavior of the obtained additive mixture is evaluated. According to the revised literature, the results strongly depend on type, concentration, and dispersal of used nano-additive. In fact, it has been seen that simple shear mixing followed by sonication homogenizes the distribution of the nanoparticles within the bituminous matrix and favors the bonds’ formation. The viscosity of the mixture of bitumen with nanoparticles improves with the increase of the percentage of additive added: it indicates a potential improvement to permanent deformation and rutting. Another benefit is an increased resistance of the binder to aging. Furthermore, it has been shown that the nanoparticles are able to prolong the service life of a bituminous mixture by means of various interdependent chemical–physical mechanisms that can influence the resistance to fatigue failure or the ability to self-heal. However, the effectiveness of these improvements depends on the particle type, added quantity and mixing technique, and the tests carried out.

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Section: Discussionmentioning

confidence: 99%

Behavior Evaluation of Bituminous Mixtures Reinforced with Nano-Sized Additives: A Review

Fusco¹,

Moretti²,

Fiore³

et al. 2020

Sustainability

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show abstract

“…The AFM used in this paper was produced by Bruker Company (Rheinstetten, Germany). The measurement principle is that the force between the probe of the cantilever and the atom of the The AFM samples were prepared by using the aged bitumen, and the steps are shown as follows [20,33,34]. Firstly, at the temperature of 145 • C, the bitumen was picked up by a glass rod and dropped on the glass slide.…”

Section: Atomic Force Microscope (Afm) Test Conditions and Methodsmentioning

confidence: 99%

“…Photograph of the AFM sample preparation process is shown in Figure 3. The AFM samples were prepared by using the aged bitumen, and the steps are shown as follows [20,33,34]. Firstly, at the temperature of 145 °C, the bitumen was picked up by a glass rod and dropped on the glass slide.…”

Section: Atomic Force Microscope (Afm) Test Conditions and Methodsmentioning

confidence: 99%

Effect of Thermo-Oxidative Ageing on Nano-Morphology of Bitumen

et al. 2019

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In recent years, the research on bitumen has reached the nanometer level, but there are still some problems in the study of the relationship between the atomic force microscope (AFM) nano-morphology and ageing of bitumen. The purpose of this paper is to find out the effect of thermal oxygen ageing on the nano-morphology of bitumen. Atomic force microscope (AFM) test sample of bitumen was prepared in this paper. Area ratio of bee-like structure, roughness, and maximum amplitude were selected as the nano-morphological parameters of the bitumen. The calculation method of nano-parameters was also proposed. Bitumen with different ageing degrees was prepared by thin film oven test (TFOT). Nano-morphological parameters of bitumen with different ageing degrees were obtained by AFM and analyzed with NanoScope Analysis, and the relationships between nano-morphological parameters and bitumen technical indexes after ageing, such as penetration, ductility, softening point, and viscosity were analyzed. The test results show that the wave crests and wave troughs of the bee-like structure on the surface of the bitumen alternate, while the other areas are relatively flat. The bee-like structure continues to develop as the ageing time prolongs, and the number of bee-like structures decreases, but the volume and the undulation degree increase. With the ageing time prolonging, the nano-parameters of bitumen, such as the area ratio of bee-like structure, roughness, and maximum amplitude, show a trend of increasing gradually, but the increasing rates become smaller and smaller. During the ageing process of bitumen, with the increase of nano-morphological parameters (area ratio of bee-like structure, roughness, and maximum amplitude), penetration at 25 °C and ductility at 15 °C of the bitumen decrease, and softening point and viscosity at 60 °C increase. AFM testing technology and image analysis method in this paper can be used for a reference in the nano-scale study of bitumen.

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“…10,12 The compatibility of inorganic nanoparticles in SMB is poor. 13,14 Layered silicate is harmful to the low temperature property of SMB. 9,12 These deciencies affect the improving effectiveness of these modifying agents on the antiaging ability of SMB, and eventually astrict their application in SMB.…”

Section: Introductionmentioning

confidence: 99%