Mesoscale fracture analysis of recycled aggregate concrete based on digital image processing technique

Since recycled aggregate concrete (RAC) is valuable for green concrete and global sustainability, it has attracted many numerical research studies as a five‐phase material in mesolevel. In this study, the digital image processing (DIP) technique is used to obtain the real aggregate and mortar distri...

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Bibliographic Details
Published in:Structural concrete : journal of the FIB 2021-01, Vol.22 (S1), p.E33-E47
Main Authors: Peng, Yijiang, Ying, Liping, Kamel, Mahmoud M. A., Wang, Yao
Format: Article
Language:English
Subjects:
base force element method (BFEM)
Composite materials
Compression tests
Concrete aggregates
Crack propagation
Cracking (fracturing)
digital image processing (DIP)
Digital imaging
Energy distribution
Failure analysis
Failure mechanisms
Failure modes
Fracture mechanics
Image processing
mesodamage model
Mortars (material)
numerical analysis concrete
recycled aggregate concrete (RAC)
Recycled materials
Stress propagation
Stress-strain curves
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Summary:Since recycled aggregate concrete (RAC) is valuable for green concrete and global sustainability, it has attracted many numerical research studies as a five‐phase material in mesolevel. In this study, the digital image processing (DIP) technique is used to obtain the real aggregate and mortar distribution of recycled concrete specimens. By applying the DIP MATLAB model, the real mesoheterogeneity of RAC is well represented. Based on the base force element method (BFEM), a mesomechanical model is constructed to simulate the uniaxial tension and compression tests of recycled concrete specimens subjected to displacement loads. The damage and the cracking mechanisms of RAC are analyzed in the mesolevel. Moreover, the failure process and the failure mode are investigated. Results indicate the nonlinearity deformation, stress redistribution, and cracks propagation of RAC. The stress–strain curve, fracture energy, and fracture distribution are also figured. The comparative analysis between the simulation and the experimental results of in situ RAC samples shows the applicability of the model; therefore, the failure mechanism is revealed. It also extends the application of the BFEM in the field of failure mechanism analysis of RAC as a heterogeneous composite material.
ISSN:1464-4177
1751-7648
DOI:10.1002/suco.201900338