Rigid-Block DEM Modeling of Mesoscale Fracture Behavior of Concrete with Random Aggregates
Publication: Journal of Engineering Mechanics
Volume 149, Issue 2
Abstract
The mesoscale structure generated in concrete plays a significant role in the mechanical properties and local failure behavior of mesoscale concrete. This work proposes a novel rigid-block discrete-element method (RB-DEM) for concrete modeling with random mesoscale structure. The results of the uniaxial compression using the RB-DEM demonstrated satisfactory agreement with experimental data. The RB-DEM does not only show satisfactory performance in simulation but also it is simple to use. The RB-DEM model can be built from any finite-element mesh generator, either open source codes or commercial software, which are readily available. The interfacial transition zone (ITZ) is modeled directly by assigning the weakened contact model or parameter at the interface between aggregate and mortar. The effects of ITZ parameters, aggregate volume fraction, and geometric shape on the stress–strain curve and crack propagation are discussed. This work provides a novel and efficient tool for the mesoscale fracture simulation of concretelike material considering the relatively large time-step of the DEM.
Practical Applications
Concrete is one of the most common building materials, and its mechanical properties and crack evolution under pressure are extremely important for practical engineering construction. With the development of computer performance, scholars have used software or code to simulate experiments to improve efficiency and save costs (this is known as numerical simulation). This paper proposes a novel method named rigid-block DEM to simulate uniaxial compressive strength test of concrete, and the results were highly similar to the actual experimental results. This method can help researchers further study the influence of various concrete parameters on its performance. Compared with the traditional methods, the rigid-block DEM has abundant advantages such as simple model generation and high calculation efficiency, which provides a valuable reference for the future numerical simulation of concrete, and has certain guiding significance for engineering construction.
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Data Availability Statement
All data, models, and codes that support the findings of this paper are available from the corresponding author upon reasonable request.
Acknowledgments
This investigation is financially supported by the National Key R&D Program of China (2018YFC0407004), the Fundamental Research Funds for the Central Universities (No. B200201059), the National Natural Science Foundation of China (Grant No. 51709089), and 111 Project.
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Information
Published In
Journal of Engineering Mechanics
Volume 149 • Issue 2 • February 2023
Copyright
© 2022 American Society of Civil Engineers.
History
Received: May 30, 2022
Accepted: Oct 20, 2022
Published online: Dec 14, 2022
Published in print: Feb 1, 2023
Discussion open until: May 14, 2023
ASCE Technical Topics:
- Aggregates
- Concrete
- Concrete structures
- Continuum mechanics
- Cracking
- Discrete element method
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Fracture mechanics
- Infrastructure
- Material mechanics
- Material properties
- Materials engineering
- Methodology (by type)
- Models (by type)
- Numerical methods
- Pavements
- Solid mechanics
- Structural behavior
- Structural engineering
- Structural models
- Structures (by type)
- Transportation engineering
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