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Impact of Varied Recycled Aggregate Inclusions on Mechanical Properties and Damage Evolution Based on Multiphase
Yongsheng Ma1, Tiefeng Chen1, Xiaojian Gao1
1School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China.
Materials (Basel, Switzerland)
|December 11, 2025
Summary
Recycled concrete with different inclusions shows varied stress concentration. Low-modulus materials like aerated brick cause failure, while high-modulus ones distribute stress effectively, aiding composite material design.
Area of Science:
- Materials Science
- Civil Engineering
- Solid Mechanics
Background:
- Recycled concrete utilizes waste materials, but understanding stress distribution with various inclusions is crucial for structural integrity.
- Multiphase Inclusion Theory (MIT) provides a framework for analyzing stress concentrations in composite materials.
Purpose of the Study:
- To investigate stress concentration in model recycled concrete with diverse inclusions using Multiphase Inclusion Theory (MIT).
- To analyze the influence of inclusions' mechanical properties (elastic modulus, Poisson's ratio) on stress distribution.
Main Methods:
- Theoretical analysis using Multiphase Inclusion Theory (MIT).
- Experimental testing of model recycled concrete specimens.
- Numerical simulations using the Finite Element Method (FEM).
Main Results:
- Inclusions with different elastic moduli and Poisson's ratios significantly alter stress concentration.
- Low-modulus inclusions (e.g., aerated brick) lead to higher stress concentration and potential failure.
- High-modulus inclusions (e.g., natural stone, ceramic tile) improve stress distribution, mitigating concentration effects.
- Inclusions with moduli similar to the matrix (e.g., red brick, waste concrete) enhance stress compatibility and balance.
Conclusions:
- MIT accurately predicts stress concentration in materials with high elastic moduli under compression.
- Theoretical, experimental, and FEM results show close correlation, validating the MIT model.
- The findings support the optimized design and application of composite materials in engineering.
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