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Computers and Concrete Volume 38, Number 3, September 2026 , pages 581-608 DOI: https://doi.org/10.12989/cac.2026.38.3.08 |
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 open accessA BEM multiscale formulation for modelling the mechanical behaviour of recycled aggregate concrete |
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Ivan Dourado Mariano Lopes, Michele Cristine da Silva, Matheus Calaça de Sousa, Wellington Andrade da Silva, José Julio de Cerqueira Pituba, Gabriela Rezende Fernandes
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| Abstract | ||
| This study presents a BEM model within a Multiscale Approach to model the mechanical behaviour of concrete with partial and total replacement of natural coarse aggregates (NCA) by recycled coarse aggregates (RCA) from construction and demolition waste (CDW). The Representative Volume Element (RVE) concept is adopted to represent the heterogeneous microstructure of the material, and the fracture process in the interfacial transition zone (ITZ) is modelled using cohesive-contact finite elements superposed on the BEM interface elements. Additionally, we consider the plasticity of the mortar matrix, while the aggregates are modelled as elastic. Different parameters are adopted for natural and recycled coarse aggregates, as well as for the cohesive-contact finite elements at the ITZ around the recycled aggregates. Eight different replacement percentages are adopted for aggregates, and the numerical results are compared with experimental results for 0%, 49,68%, and 100% of replacement. We show that the proposed model is stable and can reproduce the experimental results up to the peak load. | ||
| Key Words | ||
| boundary element method; cohesive fracture; concrete; multiscale modelling; recycled coarse aggregate; RVE | ||
| Address | ||
| Civil Engineering Department, Federal University of Catalão (UFCAT), Av. Dr. Lamartine Pinto de Avelar, 1120, Vila Chaud - CEP 75704-020 Catalão - GO Brazil | ||