Author
Fariborz Vahedi
Bio: Fariborz Vahedi is an academic researcher. The author has contributed to research in topics: Asphalt. The author has an hindex of 1, co-authored 1 publications receiving 30 citations.
Topics: Asphalt
Papers
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TL;DR: In this article, the effect of nano-TiO2 in improving bitumen property and rutting resistance in Asphalt pavement under dynamic loading was investigated. And the results illustrate that using nano-O2in asphaltbinder samples cause to an improvement in rutbingdepth in comparison with the ordinarymixtures.
Abstract: Modification of the asphalt binder is one approach taken to improve Asphalt pavement performance. Rutting is one of the most important factors that could reduce the life of asphalt pavements.Nowadays, the application of nanotechnologyto achieve materials that are more resistant is expanding in asphalt pavement thatNano-TiO2 is among the most exciting and promising classes of materials discovered recently. The purpose of this study is laboratory research on the effect of Nano-TiO2 in improving Bitumen property and rutting resistance in Asphalt pavement under dynamic loading. For this purpose, the wheel-tracking test was carried outon ordinary and Nano-TiO2 modified hot mix asphalt samples.The results illustrate that using Nano-TiO2in asphaltbinder samples cause to an improvement in ruttingdepth in comparison with theordinarymixtures.
38 citations
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TL;DR: In this paper, a review of the main nano materials and related techniques used for nano-modified asphalts and major performance characteristics at various states is presented, where some conventional test results including viscosity, dynamic modulus, stiffness, rut depth, indirect tensile strength and so on were employed to characterize the rheological and engineering performances of nano- modified asphalms and some innovative technologies such as atomic force microscopy and scanning electron microscopy, X-ray diffraction, and Fourier transform infrared spectroscopy were effectively utilized to explore their micro structures and
259 citations
TL;DR: In this article, three optimal nano-particles/polymer modification systems for SK-70 base asphalt including 3%nano-ZnO/0.5%, 3%Nano-TiO2/3.7%SBS, 5% nano-CaCO3/4%SBR were proposed, and the effects of these three optimal modification formulations on high and low temperature properties of base asphalt, dynamic shear rheometer (DSR), thin film oven test (TFOT), and beam bending rheometry (BBR) tests were
131 citations
TL;DR: In this paper, the effect of nano-Titanium dioxide (TiO2) has been investigated to improve HMA properties and the results showed that adding nano-TiOO2 led to great improvements on permanent deformation and fatigue life of HMA.
125 citations
TL;DR: In this article, the effect of nanoparticles was evaluated as an antistrip agent on the moisture damage of hot mix asphalt (HMA) is evaluated in two types of aggregates with different sensitivities against moisture damage.
Abstract: One of the main distresses of hot mix asphalt (HMA) is moisture damage. The most common method for decreasing this type of distress is using antistrip additives. In this study, the effect of nanoparticles was evaluated as an antistrip agent on the moisture damage of HMA. Two types of aggregates were evaluated in this study with different sensitivities against moisture damage (limestone and granite aggregate) and the asphalt binder with 60/70 penetration grade and nano zinc oxide (ZnO) in two different percentages by weight of the asphalt binder. The tests employed to evaluate the effects of modifying asphalt binder by nanomaterials on the moisture damage of asphalt mixture were surface free energy (SFE) and AASHTO T283. The results showed that the ratio of wet/dry values of indirect tensile strength for the mixtures containing nano ZnO for two types of aggregate were higher than the control mixtures. In addition, the results of the SFE method showed that adding nano ZnO increased the total SFE of the asphalt binder, which led to better coating of the aggregate with asphalt binder. Nano ZnO decreased the acid to base ratio of SFE of asphalt binder, while it led to improving adhesion between the asphalt binder and acidic aggregate that are prone to moisture damage.
81 citations
TL;DR: In this paper, the influence of nano-ZnO and SBS modifiers on the physical properties and structure of asphalt using molecular dynamics (MD) method was investigated. And the results showed that nano-znO particles decrease solubility parameter of asphalt and improve the miscibility between SBS and asphalt.
76 citations