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Author

Yao Zhang

Other affiliations: Yangzhou University
Bio: Yao Zhang is an academic researcher from Southeast University. The author has contributed to research in topics: Asphalt & Discrete element method. The author has an hindex of 14, co-authored 37 publications receiving 679 citations. Previous affiliations of Yao Zhang include Yangzhou University.

Papers
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TL;DR: In this paper, the simulation of wheel tracking test and the high-temperature rutting behavior of an asphalt mixture by using the discrete element method (DEM) was investigated.
Abstract: This study investigated the simulation of wheel tracking test and the high-temperature rutting behaviour of an asphalt mixture by using the discrete element method (DEM). Based on the DEM software named as Particle Flow Code in three dimensions (PFC3D), a micromechanical model of an asphalt mixture composed of coarse aggregates, asphalt mastic, and air voids was built and a two-dimensional virtual wheel tracking test was simulated. Based on the virtual wheel tracking test, the distribution of displacement and contact forces within test specimen were analysed. It is proved that the built virtual wheel tracking test can capture the rutting deformation caused by the combination of densification and lateral flow deformation. It is also indicated that, within an asphalt mixture, the aggregate skeleton is the main bearing body for the compressive forces, while the compressive and tensile forces between aggregate and mastic are severer than that within asphalt mastic. It is important to guarantee the stability o...

105 citations

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TL;DR: In this paper, the diffusion and distribution of the rejuvenator in the aged asphalt of reclaimed asphalt pavement (RAP) materials during hot recycling was investigated, where diffusion tests were designed based on the penetration test and the dynamic shearing rheometer (DSR) test to evaluate the diffusivity and diffusion in aged asphalt.

79 citations

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TL;DR: In this paper, the effects of different parameters related to air voids on the creep behavior of asphalt mixture based on micromechanical modeling and virtual test through three-dimensional discrete element method (DEM).

68 citations

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TL;DR: In this paper, a three-dimensional micromechanical DEM model for asphalt mixtures was constructed by particle flow code in three dimensions (PFC3D) and verified by laboratory wheel tracking tests to predict the rutting behavior of the asphalt mixture.

67 citations

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TL;DR: Based on laboratory tests and discrete element method (DEM), Wang et al. as discussed by the authors investigated the influences by mechanical property heterogeneity of different ingredients of asphalt mixture on the creep behavior of asphalt mixtures.

65 citations


Cited by
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Ali Behnood1
TL;DR: A review of the literature on the applications of various types of rejuvenators in paving industry and their effects on the properties of the aged binders is presented in this paper, where the techniques for rejuvenating the aged asphalt binders and the mechanism of rejuvenation are also reviewed.

178 citations

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TL;DR: In this article, the authors provide an overview on utilizing RAP, and the use of rejuvenators, type and dosage, in production of asphalt pavement, and provide a comparison between different rejuvenators.

174 citations

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TL;DR: In this paper, a combined experimental and numerical approach is proposed for the characterisation of the mechanical behaviour of foamed geopolymer concretes, and the results show that the air void distribution has a significant influence on the compressive strength of the material, while the micro-void structure has less effect on the loading bearing capacity.

114 citations

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TL;DR: In this article, a 3D numerical model of asphalt mixtures was assembled with three different components, and was validated by uniaxial compression tests via comparison with the laboratory result.
Abstract: Aggregate occupies at least three-quarters of the volume of asphalt mixture and can significantly affect the performance of pavement. The geometrical morphology influences the slippage and interlock among aggregates for resisting and distributing applied loads. In recent years, the discrete-element method (DEM) has been employed for simulation of asphalt mixture structure. This paper introduces an approach for simulation of aggregate and asphalt mixtures using parameterized shape and size gradation. Both the plane geometry factor (PGF) and the section aspect ratio (SAR) were employed to describe the three-dimensional (3D) geometric characteristics of aggregates. A numerical technique of aggregate models was implemented with probabilistic parameters depending on statistical results of PGFs and SARs. The 3D numerical model of asphalt mixtures was assembled with three different components, and was validated by uniaxial compression tests via comparison with the laboratory result. It was found that the PGF and SAR are appropriate to describe the three-dimensional features of aggregate shapes, because a simplified space object can be described by a two-dimensional (2D) graphical projection and a vector scalar corresponding to the space vector. Probability distribution curves of PGFs and SARs between coarse aggregates were in concordance with the Gauss-type function, because their correlation coefficients were all greater than 95%. It was verified that the developed clumping algorithm of aggregates was reasonable in terms of the shape and size gradation. Based on the parallel-bond model and Burger's model, the results of virtual tests were in good agreement with those of laboratory uniaxial tests. The angularity (PGF) of aggregates has a beneficial effect on the strength and stability of asphalt mixtures, whereas the flat-elongated feature (SAR) has a negative effect on the strength and stability of asphalt mixtures.

107 citations

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TL;DR: In this article, the low temperature properties of crumb rubber modified binder (CRMB) are governed by the factors such as asphalt properties, crumbs rubber properties, mixing temperature, mixing time, mixing type and admixture.

104 citations