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

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 th...

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Bibliographic Details
Published in:Sustainability 2020-10, Vol.12 (19), p.8044
Main Authors: Fusco, Raffaella, Moretti, Laura, Fiore, Nicola, D’Andrea, Antonio
Format: Article
Language:English
Subjects:
Additives
Aging
Asphalt mixes
Asphalt pavements
Calcium oxide
Carbon
Cracks
Dispersal
Graphene
Lime
Literature reviews
Localization
Mechanical properties
Nanoparticles
Nanotechnology
Physical properties
Polymers
Research methodology
Rheology
Service life
Sonication
Systematic review
Titanium dioxide
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Summary: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.
ISSN:2071-1050
2071-1050
DOI:10.3390/su12198044