Study of normal and shear material properties for viscoelastic model of asphalt mixture by discrete element method

Feng, Huan; Pettinari, Matteo; Stang, Henrik

doi:10.1016/j.conbuildmat.2015.08.116

Cited by 28 publications

(14 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…After the two models are connected in series, the creep and stress relaxation characteristics of the material could be described, which is suitable for the force analysis of viscoelastic materials. Additionally, the aggregates and reclaimed aggregates are regarded as elastic materials, and their constitutive mechanical properties are characterized by the spring model [35,36].…”

Section: Constitutive Modelmentioning

confidence: 99%

Study on Mesoscopic Mechanics of Recycled Asphalt Mixture in the Indirect Tensile Test

Sheng

Jia

Chen

et al. 2020

Mathematical Problems in Engineering

View full text Add to dashboard Cite

Reclaimed asphalt pavement (RAP) mainly contains asphalt binder and aggregates, and the RAP materials used in paving roads could save virgin materials. This paper studied the following: asphalt mixture with different RAP material contents was prepared; then the indirect tensile test was carried out, and the mesoscopic model of the recycled asphalt mixture was reconstructed digitally. Discrete element method (DEM) of indirect tensile test was carried out to analyze the mechanical properties of recycled asphalt mixture in mesoscopic perspective. The results showed that there were some gaps between the simulation result of the digital specimen model and the test value of the recycled asphalt mixture, but the velocity vector and the law of force chain development of the recycled asphalt mixture could be explained in mesoscopic perspective. It proved that the virtual simulation test of the mechanical test was effective. The damage process of recycled asphalt mixture was analyzed in mesoscopic perspective, and the unification of mechanical response and macroscopic appearance was completed. Meanwhile, the simulation method of mesoscopic mechanics was an effective supplement to traditional tests, and guided tests method theoretically.

show abstract

Section: Constitutive Modelmentioning

confidence: 99%

Study on Mesoscopic Mechanics of Recycled Asphalt Mixture in the Indirect Tensile Test

Sheng

Jia

Chen

et al. 2020

Mathematical Problems in Engineering

View full text Add to dashboard Cite

show abstract

“…Different contact models between the different particles are present in Table 1. According to the micromechanical parameters in the paper of Feng [21] and Zelelew [13], the model parameters were set based on empirical values [22] and previous experimental results [5,23]. The parameters were also adjusted appropriately to match the experimental results of the indirect tensile test from the laboratory, i.e., peak force and stiffness.…”

Section: Discrete Element Analysis Of the Indirect Tensile Fatigue Testmentioning

confidence: 99%

Discrete Element Analysis of Indirect Tensile Fatigue Test of Asphalt Mixture

Liu

et al. 2019

Applied Sciences

View full text Add to dashboard Cite

In order to investigate the damage to microstructure and some other micromechanical responses during a fatigue test on asphalt mixture, Particle Flow Code (PFC) was used to reconstruct a two-dimensional discrete element model of asphalt mixture, based on computed tomography (CT) images and image-processing techniques. The indirect tensile fatigue test of asphalt mixture was simulated with this image-based microstructural model, and verified in the laboratory. It was found that there were four stages during the fatigue failure: no crack, crack initiation, crack developing, and interconnected crack. Cracks mainly developed between the aggregate and asphalt mortar, near the loading axis. The corresponding stages of failure, the developing trend and the distribution characteristics of the cracks matched well with those in the laboratory test. Furthermore, the trends of both the time-load curve and time-displacement curve from the simulation test were also consistent with those from the experimental test. In short, the distribution characteristics of cracks and internal forces of asphalt mixture show that it is feasible to simulate the fatigue performance of the asphalt mixture by a discrete element method (DEM). Appl. Sci. 2019, 9, 327 2 of 17 by the DEM [7]. A local discrete element model was established to discuss the damage and cracks caused by the cyclic fatigue load [8]. Yu analyzed the effect of the aggregate packing on the dynamic modulus of an asphalt mixture by the DEM [9]. These achievements mentioned above demonstrate that the DEM is applicable for the research on fatigue characteristics of pavement asphalt mixes. However, the discrete element models of asphalt mixtures are generated by computer algorithms, which are different from the actual microstructures. The distribution characteristics of cracks and internal forces of asphalt mixtures are also seldom described in the indirect tensile fatigue test.Since microstructure images captured by X-ray computed tomography (X-ray CT) can show the internal distribution and composition of the material, CT and the DEM have been widely applied to asphalt mixture together recently. You et al. obtained the images of asphalt mixture samples by the optical scanning, and reconstructed two-dimensional discrete element models based on these optical images [10]. Based on many two-dimensional slices of the same sample, the three-dimensional discrete element model of an asphalt mixture was reconstructed [11,12]. Zelelew et al. described the microstructure of asphalt mixtures obtained by CT and established a two-dimensional discrete element model to predict the creep compliance of uniaxial loading [13]. Zhou investigated the dynamic deformation process of an asphalt mixture based on the image-based discrete element model [14]. Tan believed that image-based discrete element model could provide a potential detailed insight into the failure mechanism of the heterogeneous rocks at the microscopic level [15]. Generally speaking, the asphalt mixture is a non-uniform complex visco...

show abstract

“…S. Hou explained how asphalt mixtures bear vehicle loadings, as well as the potential reasons the rutting forms from a micro-mechanical view, through the micro-mechanical response of asphalt mixtures based on the discrete element method [ 18 ]. H. Feng studied the normal and shear material properties for a viscoelastic model of an asphalt mixture using DEM [ 19 ]. T. Ma et al studied the effect of air voids on the high-temperature creep behavior and fatigue life of an asphalt mixture based on the discrete element method [ 20 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

Shear Deformation Behavior of a Double-Layer Asphalt Mixture Based on the Virtual Simulation of a Uniaxial Penetration Test

et al. 2020

View full text Add to dashboard Cite

This paper aims to clarify the shear deformation behavior of double-layer asphalt mixtures using the virtual uniaxial penetration test (UPT) with a discrete element method. For this purpose, asphalt mixtures with two different nominal maximum aggregate sizes were designed for the preparation of double-layer wheel tracking test specimens. Then, the cylindrical cores were prepared from the specimens and were cut for capturing the longitudinal profile images. These images were used to reconstruct a two-dimensional discrete element model (DEM) of the uniaxial penetration test specimen. The results indicate that the shear deformation behavior of the asphalt mixtures showed corresponding changes under the virtual loading. The tensile and compressive stress were distributed unevenly within the upper layer after the test, and both coarse aggregates and asphalt mortars bore a greater shear stress. Therefore, cracks were more likely to occur in the upper layer, leading to the failure of the specimens. This process enhanced the bonding between the asphalt mortars and the mineral aggregates. The aggregate particles in the upper layer moved more vertically, while those in the lower layer generally moved more laterally under the virtual loading. This behavior reveals the rutting mechanism of asphalt pavement.

show abstract

Study of normal and shear material properties for viscoelastic model of asphalt mixture by discrete element method

Cited by 28 publications

References 15 publications

Study on Mesoscopic Mechanics of Recycled Asphalt Mixture in the Indirect Tensile Test

Study on Mesoscopic Mechanics of Recycled Asphalt Mixture in the Indirect Tensile Test

Discrete Element Analysis of Indirect Tensile Fatigue Test of Asphalt Mixture

Shear Deformation Behavior of a Double-Layer Asphalt Mixture Based on the Virtual Simulation of a Uniaxial Penetration Test

Contact Info

Product

Resources

About