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Journal ArticleDOI: 10.1080/14680629.2019.1634634

Use of nanomaterial for asphalt binder and mixtures: a comprehensive review on development, prospect, and challenges

04 Mar 2021-Road Materials and Pavement Design (Taylor & Francis)-Vol. 22, Iss: 3, pp 492-538
Abstract: This article aimed at providing comprehensive information on the use of nanomaterial in asphalt binder and mixes based on an exhaustive review of the literature. The complete literature review can ...

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13 results found

Open access
01 Sep 2010-
Abstract: This article focuses on current and potential developments in pavement engineering where the unique properties of nanomaterials can be used to improve the built environment. The original paper on which this article is based was chosen as Best Paper (Pavements) for 2009 by the SAICE Transportation Division.

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63 Citations

Journal ArticleDOI: 10.1016/J.CONBUILDMAT.2020.119196
Abstract: Semi-flexible pavement (SFP) is a new pavement technology consisting of open-graded asphalt concrete with a high air void content filled by injecting special grouting materials. The SFP is constructed without expansion, contraction, and construction joints and also demonstrates prominent rutting and shoving/corrugation resistances. These new pavement materials simultaneously possess flexible characteristics of asphalt pavements and the high strength (hardness) of concrete pavements. The main purpose of this study is to provide comprehensive review on design, construction, and performance of semi-flexible pavements based on laboratory and field scales evaluation. The first part of this paper presents the introduction of semi-flexible pavement, its design approach, and laboratory-scale preparation. In the second part, a performance evaluation of semi-flexible pavement under traffic loading, resistance to fuel, oil spillage, and its durability are discussed. In the last part, the field evaluation method and existing challenges are investigated. The review of the previous studies indicated that SFP is recognized as an alternative to asphalt and concrete pavements due to its remarkable features and mechanical performance.

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Topics: Asphalt concrete (59%), Asphalt (50%)

18 Citations

Journal ArticleDOI: 10.1016/J.CONBUILDMAT.2020.118092
Abstract: In recent years, utilization of warm mix asphalt (WMA) proven to be an environmental way for reducing carbon dioxide emissions in the production and laying process of asphalt mixtures by decreasing the mixing and compaction temperatures. On the other hand, increasing traffic volumes cause asphalt pavements exposed to higher stresses, which could lead to premature distresses. In order to improve the resistance to distresses and alleviate the drawback of WMA mixtures, modification of the bituminous material has grown significantly. In this research, Sasobit as a warm mix asphalt additive and nano-montmorillonite k10 as a bitumen modifier used to modify the 60/70 and 40/50 pen-grade bitumen. The contents of Sasobit were selected are 0%, 2.5%, 3.5% and 4%, while for nano-montmorillonite k10 these percentages are 0%, 2.5%, 3.5% and 5% (by weight of pure bitumen). The objective of this study is to investigate the effect of additives on the conventional and rheological properties of bitumen. To achieve this goal, conventional tests, rotational viscosity (RV), dynamic shear rheometer (DSR), bending beam rheometer (BBR), and direct tension tests were conducted to characterize the properties of pure and modified bitumen. The results indicated that Sasobit has a negligible effect on fatigue and low temperature cracking resistance. Conversely, when increasing the amount of nano-montmorillonite k10, these properties were improved. The results showed that nano-montmorillonite k10 improves the rheological properties of bitumen and reduced drawback effect of Sasobit, especially in low temperature cracking performance.

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Topics: Dynamic shear rheometer (61%), Asphalt (51%)

10 Citations

Journal ArticleDOI: 10.1016/J.CONBUILDMAT.2020.120954
Abstract: Increasing traffic congestion especially in cold climates has increased the damage caused by low-temperature cracks (LTCs) in the asphalt mix where the constituents are not able to withstand the loads required in these climates lonely and using the modifier is undeniable. In recent years, some research fields have been conducted on the use of nanomaterials as a modifier in asphalt mixtures to improve their properties. In accordance with previous researches, one of the nanomaterials that have appropriate effects on the performance of asphalt mixtures is Nano-SiO2. In this study, the effect of Nano-SiO2 on the incident of low-temperature cracks in asphalt mixtures is experimentally investigated. For this purpose, the semicircular bending test (SCB) under mixed-mode I/II loading is used for investigating the effect of Nano-SiO2 on forming cracks in asphalt (i.e., vertical and angular crack) at different temperatures of −5 ℃, −15 ℃, and −25 ℃. Results show that the maximum stress intensity factor (SIF) of the modified asphalt mixtures is related to specimens which have angular crack under pure opening mode, while the maximum critical SIF is improved when Nano-SiO2 is added to specimens which have vertical cracks under mixed-mode I/II with Me = 0.6 at −25 ℃. Furthermore, the critical SIF of all specimens having both vertical and angular cracks is significantly improved by adding 1.2% of Nano-SiO2 at all temperatures.

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Topics: Stress intensity factor (50%), Asphalt (50%)

7 Citations

Journal ArticleDOI: 10.1061/(ASCE)MT.1943-5533.0003056
Abstract: Although many research works are available on evaluating the effect of carbon nanotube (CNT) on intermediate and high temperature performance of asphalt binder, limited studies have been re...

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Topics: Carbon nanotube (51%)

5 Citations


189 results found

Journal ArticleDOI: 10.1038/354056A0
Sumio Iijima1Institutions (1)
01 Nov 1991-Nature
Abstract: THE synthesis of molecular carbon structures in the form of C60 and other fullerenes1 has stimulated intense interest in the structures accessible to graphitic carbon sheets. Here I report the preparation of a new type of finite carbon structure consisting of needle-like tubes. Produced using an arc-discharge evaporation method similar to that used for fullerene synthesis, the needles grow at the negative end of the electrode used for the arc discharge. Electron microscopy reveals that each needle comprises coaxial tubes of graphitic sheets, ranging in number from 2 up to about 50. On each tube the carbon-atom hexagons are arranged in a helical fashion about the needle axis. The helical pitch varies from needle to needle and from tube to tube within a single needle. It appears that this helical structure may aid the growth process. The formation of these needles, ranging from a few to a few tens of nanometres in diameter, suggests that engineering of carbon structures should be possible on scales considerably greater than those relevant to the fullerenes. On 7 November 1991, Sumio Iijima announced in Nature the preparation of nanometre-size, needle-like tubes of carbon — now familiar as 'nanotubes'. Used in microelectronic circuitry and microscopy, and as a tool to test quantum mechanics and model biological systems, nanotubes seem to have unlimited potential.

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Topics: Single-Walled Nanotube (56.99%), Colossal carbon tube (56%), Carbon nanotube (56%) ... show more

36,871 Citations

Open accessJournal ArticleDOI: 10.1038/NATURE04233
Kostya S. Novoselov1, A. K. Geim1, Sergey V. Morozov, Da Jiang1  +4 moreInstitutions (2)
10 Nov 2005-Nature
Abstract: Quantum electrodynamics (resulting from the merger of quantum mechanics and relativity theory) has provided a clear understanding of phenomena ranging from particle physics to cosmology and from astrophysics to quantum chemistry. The ideas underlying quantum electrodynamics also influence the theory of condensed matter, but quantum relativistic effects are usually minute in the known experimental systems that can be described accurately by the non-relativistic Schrodinger equation. Here we report an experimental study of a condensed-matter system (graphene, a single atomic layer of carbon) in which electron transport is essentially governed by Dirac's (relativistic) equation. The charge carriers in graphene mimic relativistic particles with zero rest mass and have an effective 'speed of light' c* approximately 10(6) m s(-1). Our study reveals a variety of unusual phenomena that are characteristic of two-dimensional Dirac fermions. In particular we have observed the following: first, graphene's conductivity never falls below a minimum value corresponding to the quantum unit of conductance, even when concentrations of charge carriers tend to zero; second, the integer quantum Hall effect in graphene is anomalous in that it occurs at half-integer filling factors; and third, the cyclotron mass m(c) of massless carriers in graphene is described by E = m(c)c*2. This two-dimensional system is not only interesting in itself but also allows access to the subtle and rich physics of quantum electrodynamics in a bench-top experiment.

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17,308 Citations

Journal ArticleDOI: 10.1126/SCIENCE.1157996
Changgu Lee1, Xiaoding Wei1, Jeffrey W. Kysar1, James Hone1  +1 moreInstitutions (2)
18 Jul 2008-Science
Abstract: We measured the elastic properties and intrinsic breaking strength of free-standing monolayer graphene membranes by nanoindentation in an atomic force microscope. The force-displacement behavior is interpreted within a framework of nonlinear elastic stress-strain response, and yields second- and third-order elastic stiffnesses of 340 newtons per meter (N m(-1)) and -690 Nm(-1), respectively. The breaking strength is 42 N m(-1) and represents the intrinsic strength of a defect-free sheet. These quantities correspond to a Young's modulus of E = 1.0 terapascals, third-order elastic stiffness of D = -2.0 terapascals, and intrinsic strength of sigma(int) = 130 gigapascals for bulk graphite. These experiments establish graphene as the strongest material ever measured, and show that atomically perfect nanoscale materials can be mechanically tested to deformations well beyond the linear regime.

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Topics: Graphene oxide paper (55%), Young's modulus (55%), Monolayer (54%) ... show more

15,863 Citations

Open accessJournal ArticleDOI: 10.1126/SCIENCE.1158877
Andre K. Geim1Institutions (1)
19 Jun 2009-Science
Abstract: Graphene is a wonder material with many superlatives to its name. It is the thinnest known material in the universe and the strongest ever measured. Its charge carriers exhibit giant intrinsic mobility, have zero effective mass, and can travel for micrometers without scattering at room temperature. Graphene can sustain current densities six orders of magnitude higher than that of copper, shows record thermal conductivity and stiffness, is impermeable to gases, and reconciles such conflicting qualities as brittleness and ductility. Electron transport in graphene is described by a Dirac-like equation, which allows the investigation of relativistic quantum phenomena in a benchtop experiment. This review analyzes recent trends in graphene research and applications, and attempts to identify future directions in which the field is likely to develop.

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10,893 Citations

Open accessJournal ArticleDOI: 10.1038/NATURE04235
10 Nov 2005-Nature
Abstract: When electrons are confined in two-dimensional materials, quantum-mechanically enhanced transport phenomena such as the quantum Hall effect can be observed. Graphene, consisting of an isolated single atomic layer of graphite, is an ideal realization of such a two-dimensional system. However, its behaviour is expected to differ markedly from the well-studied case of quantum wells in conventional semiconductor interfaces. This difference arises from the unique electronic properties of graphene, which exhibits electron–hole degeneracy and vanishing carrier mass near the point of charge neutrality1,2. Indeed, a distinctive half-integer quantum Hall effect has been predicted3,4,5 theoretically, as has the existence of a non-zero Berry's phase (a geometric quantum phase) of the electron wavefunction—a consequence of the exceptional topology of the graphene band structure6,7. Recent advances in micromechanical extraction and fabrication techniques for graphite structures8,9,10,11,12 now permit such exotic two-dimensional electron systems to be probed experimentally. Here we report an experimental investigation of magneto-transport in a high-mobility single layer of graphene. Adjusting the chemical potential with the use of the electric field effect, we observe an unusual half-integer quantum Hall effect for both electron and hole carriers in graphene. The relevance of Berry's phase to these experiments is confirmed by magneto-oscillations. In addition to their purely scientific interest, these unusual quantum transport phenomena may lead to new applications in carbon-based electronic and magneto-electronic devices.

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Topics: Quantum Hall effect (69%), Quantum spin Hall effect (67%), Bilayer graphene (65%) ... show more

10,417 Citations

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