Propagation Characteristics of Dispersion Cracks in Asphalt Concrete at Low Temperatures
Publication: Journal of Materials in Civil Engineering
Volume 36, Issue 7
Abstract
Asphalt concrete is a typical heterogeneous composite material at the mesoscale. Under the action of external load, its internal dispersion cracks interact with each other, thereby changing the crack propagation behavior, especially in low-temperature environments. In this context, this study developed a meso-structure model of asphalt concrete with randomly distributed dispersion cracks based on the Taylor medium model and the discrete element method. A virtual semicircular bending test was performed to obtain macro and micro parameter data, including stress–strain curves, data regarding the crack propagation process, and the crack-area stress field, to analyze the propagation characteristics of dispersion cracks with various crack density parameter values, , in asphalt concrete. The results indicated that (1) the predictions based on the Taylor medium model exhibit a good correlation with the numerical simulation results, demonstrating the reliability of the simulation. Moreover, the interference between dispersion cracks hinders crack propagation, significantly enhancing the low-temperature crack resistance of asphalt concrete. This interference effect is most pronounced when is set to 0.6. (2) Crack interference between dispersion cracks primarily occurs during the crack incubation stage, extending the incubation time of internal cracks in asphalt concrete and improving early crack resistance. (3) When is less than or equal to 0.6, the predominant failure mode of asphalt concrete is tensile stress failure. However, when exceeds 0.6, the fracture mode of asphalt concrete shifts from tensile fracture to shear fracture.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant No. 52308440) and the Natural Science Foundation of Sichuan Province (Grant No. 23NSFSC5888).
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 36 • Issue 7 • July 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Jul 21, 2023
Accepted: Dec 12, 2023
Published online: Apr 26, 2024
Published in print: Jul 1, 2024
Discussion open until: Sep 26, 2024
ASCE Technical Topics:
- Asphalt concrete
- Composite materials
- Continuum mechanics
- Cracking
- Discrete element method
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Fiber reinforced composites
- Fracture mechanics
- Materials engineering
- Mathematics
- Measurement (by type)
- Methodology (by type)
- Models (by type)
- Numerical methods
- Numerical models
- Parameters (statistics)
- Solid mechanics
- Statistics
- Temperature effects
- Temperature measurement
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