Meso-scale XCT-based modeling of ordinary concrete
| Autor: | N. De Marchi, Enrico Garbin, Carmelo E. Majorana, B. Pomaro, Gianluca Mazzucco, Giovanna Xotta, G. Concheri |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Discretization 0211 other engineering and technologies Voids 020101 civil engineering 02 engineering and technology 0201 civil engineering Stress (mechanics) Matrix (mathematics) Brittleness 021105 building & construction Elasto-plasticity General Materials Science Civil and Structural Engineering Soundness FEM business.industry Building and Construction Structural engineering Finite element method Concrete X-ray micro-computed tomography FEM Elasto-plasticity Damage Voids Characterization (materials science) Damage Cementitious business X-ray micro-computed tomography Concrete |
| Zdroj: | Construction and Building Materials. 286:122850 |
| ISSN: | 0950-0618 |
| DOI: | 10.1016/j.conbuildmat.2021.122850 |
| Popis: | The increasing attention to numerical issues related to material modeling is still a strong incentive to develop sound mechanical models that can explain material behavior up to failure. A procedure to handle a robust geometric meso-scale reconstruction of concrete materials is here proposed, based on X-ray Computed Tomography (CT-scan or X-ray CT). This study applies X-ray CT on ordinary concrete made with limestone aggregates. In this case the technique allows to acquire the overall inner geometry and distribution of the aggregates and also voids, thanks to the difference in material density of the components. Solid models have been generated with such technique and discretized in space to be numerically studied via the Finite Element (FE) method. The numerical results are compared with uniaxial compression tests on the same scanned specimens. For the numerical analyses a specific non-associated elasto-plastic constitutive behavior, coupled with damage, is developed for the cement matrix, whereas the coarse aggregates are treated as elastic. The mechanical characteristics of the components are gathered through a specific experimental campaign. The study confirms that a predictive simulation of damage triggering and evolution in concrete under generic 3D stress states requires the characterization of the continuum at a meso-scale level. Comparisons between numerical and experimental results proves the soundness of the proposed constitutive description to evaluate the brittle behaviour of cementitious materials and to satisfactorily simulate damage triggering under generic 3D stress states. |
| Databáze: | OpenAIRE |
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