Investigating the Effect of Aggregate Characteristics on the Macroscopic and Microscopic Fracture Mechanisms of Asphalt Concrete at Low-Temperature

Xu, Yan; Jiang, Yingjun; Xue, Jinshun; Ren, Jiaolong

doi:10.3390/ma12172675

Cited by 17 publications

(10 citation statements)

References 37 publications

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“…Several studies employed the discrete element method (DEM) in the modeling and analysis of various problems, such as the mechanical behavior of ceramics [13], milling processes [14], fractures in concrete [15] and the simulation of granular flows [16]. In DEM, materials are represented as an assembly of spheres which interact according to physical laws.…”

Section: Introductionmentioning

confidence: 99%

Effect of Grain Size and Surface Roughness on the Normal Coefficient of Restitution of Single Grains

2020

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The coefficient of restitution (COR) represents the fraction of pre-collision kinetic energy remained after the collision between two bodies. The COR parameter plays an important role in the discrete numerical analysis of granular flows or the design of protective barriers to reduce flow energy. This work investigated the COR for grain-block type impacts through comprehensive experiments using a custom-built impact loading apparatus. Glass balls of three different sizes were used as grains.The impact experiments were performed on three different types of materials as base blocks, namely brass, granite and rubber. Experiments on the brass block showed a decrease in COR values with increasing grain size. On the contrary, impacts on granite and rubber blocks showed an increase in COR values with increasing grain size. Additionally, the effect of surface roughness on the COR was investigated. It was revealed that the increase in surface roughness of either the grain or the block reduced the COR values due to the increased plastic deformations of surface asperities.

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Section: Introductionmentioning

confidence: 99%

Effect of Grain Size and Surface Roughness on the Normal Coefficient of Restitution of Single Grains

2020

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“…The parameters of equations at various temperatures are extracted to generate the relation between parameters and temperatures using the mathematical regression analysis in Figure 13. Substituting Equations (17) and (18) into Equation (6), the model equation of the coupling effect between temperature and strain rate on the peak stress of hydraulic asphalt concrete in compression is obtained, as shown in Equation (19): According to Figure 13, the parameter a is between 1 and 1.056. Considering that the parameter a is the dynamic increase factor at the static strain rate, the parameter a can be set as 1.…”

Section: From the Data Inmentioning

confidence: 99%

“…The relation between parameter b and temperature is displayed in Figure 13. Therefore, the relevant expressions are obtained as shown below: a = 1 (17) b = 1.769 × (|T| + 5) −0.6762 R 2 = 0.9984 (18) Substituting Equations (17) and (18) into Equation 6, the model equation of the coupling effect between temperature and strain rate on the peak stress of hydraulic asphalt concrete in compression is obtained, as shown in Equation 19:…”

Section: From the Data Inmentioning

confidence: 99%

“…The comparison results are presented in Figure 14. Substituting Equations (17) and (18) into Equation 6, the model equation of the coupling effect between temperature and strain rate on the peak stress of hydraulic asphalt concrete in compression is obtained, as shown in Equation 19 × log (19) The theoretical values of the peak compressive stress of hydraulic asphalt concrete are calculated through Equation 19 From the data in Figure 14, the comparison results prove that the model equation of the coupling effect proposed in the paper is applicable to reflect the trend of the peak compressive stress of hydraulic asphalt concrete under the influence of temperature and strain rate.…”

Section: From the Data Inmentioning

confidence: 99%

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Uniaxial Dynamic Compressive Behaviors of Hydraulic Asphalt Concrete under the Coupling Effect between Temperature and Strain Rate

Tang

Liu

et al. 2020

Materials

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To investigate the compressive dynamic properties of hydraulic asphalt concrete under various temperatures, four temperatures and four strain rates have been set to perform the uniaxial compression experiments using hydraulic servo machine in this paper. The influence of temperature and strain rate on the failure modes, stress-strain curves and mechanical characteristic parameters of hydraulic asphalt concrete is analyzed and the results reveal that the failure modes and stress-strain curves have significant temperature effect. When the temperature is between −20 °C and 0 °C, the failure mode is dominated by brittle failure of asphalt binder, and hydraulic asphalt concrete shows obvious strain softening. With the addition of temperature, the failure modes of specimens are transferred from brittle failure to ductile failure since the asphalt changes from elastic-brittleness to viscoelasticity. Influenced by temperature effect, the compressive stress-strain curves of hydraulic asphalt concrete show strain hardening while the peak stress of hydraulic asphalt concrete is obviously decreased, and the variation coefficient of peak stress has a power relation with temperature. With successive increases in strain rate, the stress-strain curves of hydraulic asphalt concrete gradually are transferred from strain hardening to strain softening. The peak stress and stiffness modulus of specimens under compression gradually increase, and the dynamic increase factor of peak stress is linearly related with the logarithm value of strain rate after dimensionless treatment. In terms of the quantitative analysis of the experimental data, two relationship models of the coupling effect between temperature and strain rate are proposed. The proposed models have good applicability to the quantitative analysis of the experimental results in the manuscript. This paper offers important insights into the application and development of hydraulic asphalt concrete in hydraulic engineering.

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“…e Burgers contact models used in these studies are all invoked directly from the software (PFC) produced by Itasca Corporation. Subsequently, Ren and Sun [35] developed a new mesoscopic viscoelastic contact model, namely, the mesoscopic generalized Maxwell contact model, which could describe the low-temperature rheological behavior of asphalt concrete more accurately than the mesoscopic Burgers contact model in the DEM [36][37][38]. Shimizu et al [39] and Jin et al [40] put forward the mesoscopic generalized Kelvin contact model in the DEM but had not been applied to asphalt-based materials.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Mesoscopic Viscoelastic Contact Model on Characterizing the Rheological Behavior of Asphalt Concrete in the DEM Simulation

Ren

Liu

Xue

et al. 2020

Advances in Civil Engineering

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The numerical simulation based on the discrete element method (DEM) is popular to analyze the material behavior of asphalt concrete in recent years because of the advantage of the DEM in characterizing the heterogeneous microstructures. As a type of viscoelastic material, the rheological behavior of asphalt concrete is represented depending on the mesoscopic viscoelastic contact model between two particles in a contact in DEM simulations. However, what is missing in the existing literature studies is analysis of the influence of the mesoscopic viscoelastic contact models. Hence, the existing mesoscopic viscoelastic contact models are employed to build different types of DEM numerical samples of asphalt concrete in this study. Laboratory tests and the corresponding numerical tests at different temperatures and frequencies are implemented to investigate the difference in simulation precision in the case of using different mesoscopic viscoelastic contact models via the rheological index of dynamic modulus and phase angle. The results show the following: (1) the mesoscopic generalized Maxwell contact model provides the best simulation precision at low temperatures; (2) the mesoscopic generalized Kelvin contact model shows an improved precision at high temperatures; and (3) although the mesoscopic Burgers contact model has the simplest mathematical structure, the simulation precisions are obviously lower than those of the other two contact models, particularly when simulating the phase angle at low temperatures and frequencies. The results will be beneficial to select the appropriate mesoscopic contact model for the DEM modeling of asphalt concrete according to the loading conditions.

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Investigating the Effect of Aggregate Characteristics on the Macroscopic and Microscopic Fracture Mechanisms of Asphalt Concrete at Low-Temperature

Cited by 17 publications

References 37 publications

Effect of Grain Size and Surface Roughness on the Normal Coefficient of Restitution of Single Grains

Effect of Grain Size and Surface Roughness on the Normal Coefficient of Restitution of Single Grains

Uniaxial Dynamic Compressive Behaviors of Hydraulic Asphalt Concrete under the Coupling Effect between Temperature and Strain Rate

Influence of the Mesoscopic Viscoelastic Contact Model on Characterizing the Rheological Behavior of Asphalt Concrete in the DEM Simulation

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