Peer-reviewed veterinary case report
How mesoscopic models analyze concrete damage and structure
By Wang X et al.·2026·State Key Laboratory of Target Vulnerability Assessment, China·View original on Europe PMC →
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Original publication title: Construction Methods of Mesoscopic Models for Concrete and Quantitative Analysis of Mesoscopic Damage.
Plain-English summary
This research focuses on improving how we model concrete at a small scale, specifically looking at the shapes and arrangements of the materials that make up concrete. The authors created a new two-dimensional model that accurately represents the different components of concrete, including the aggregates (the small stones), the mortar (the cement mixture), and the transition zone between them. They found that if we ignore the transition zone, we can mistakenly think concrete is stronger than it really is, especially when it starts to fail. The study provides valuable insights into how concrete breaks down and can help in designing stronger concrete in the future.
Abstract
Existing mesoscopic numerical models still exhibit shortcomings in terms of the aggregate geometric fidelity, interface transition zone (ITZ) characterization, and modeling efficiency. To solve these problems, this paper establishes a two-dimensional mesoscopic model and analysis method for concrete, considering randomly distributed convex polygons of aggregate grains and a three-phase structure comprising aggregate, mortar, and ITZ. An efficient random placement algorithm based on background meshing is proposed to enable rapid and accurate model construction. The effects of aggregate geometry, spatial distribution, and ITZ on mechanical properties and damage evolution have been systematically studied. A quantitative relationship has been established between damage energy and the decay of strength and stiffness, and damage quantification indices have been proposed. The damage rates of mortar and ITZ, along with the variation characteristics of the damage variable <i>d</i><sub>c</sub> at each stage, have been quantified. Neglecting the ITZ leads to overestimation of the peak strength and stiffness of concrete while exacerbating its post-peak brittle behavior. The most significant increases occur in both stiffness decay and damage growth at 90% of peak stress. A sudden change occurs at approximately 0.17% axial strain (corresponding to 80% of peak stress). This study offers a meso-scale foundation for understanding concrete failure and designing high-performance concrete.
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Search related cases →Original publication on Europe PMC: https://europepmc.org/article/MED/41976679