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<p>This study presents a comparative evaluation of conventional vibrated concrete (CVC) and two-stage concrete (TSC) based on experimental characterization and finite element numerical modeling. Cylindrical specimens were experimentally evaluated through compressive strength, water absorption, void index, and surface electrical resistivity tests, while the numerical simulations were performed using a mesoscale finite element approach considering aggregates, grout, and the interfacial transition zone (ITZ) as distinct phases under elastic loading conditions. Experimental results demonstrated that TSC achieved significantly higher compressive strength (44.66&#xa0;MPa at 28&#xa0;days), corresponding to approximately 64% higher strength than CVC, along with reduced water absorption, lower void index, and higher surface electrical resistivity, indicating improved durability-related performance. Numerical simulations were performed using the finite element method under identical loading conditions corresponding to the lowest experimental failure load (21.17&#xa0;MPa). The results revealed that TSC exhibited lower global displacement (0.115&#xa0;mm) than CVC (0.125&#xa0;mm), as well as a wider stress distribution within the coarse aggregate skeleton, with peak stresses reaching approximately 70&#xa0;MPa, compared to 56&#xa0;MPa in CVC. Despite this increased stress heterogeneity at the aggregate level, the average stress values in the grout and ITZ remained comparable between both concretes. These findings provide insight into how alternative concrete production methods may influence stiffness development, deformation control, and service-state performance of structural building components.</p>

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Evaluation of the internal stress distribution in conventional vibrated concrete and two-stage concrete through numerical analysis

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月7日

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  • Luana Schuster,
  • Nicolle T. A. Soto,
  • Emílio Graciliano Ferreira Mercuri,
  • Nayara Soares Klein

摘要

This study presents a comparative evaluation of conventional vibrated concrete (CVC) and two-stage concrete (TSC) based on experimental characterization and finite element numerical modeling. Cylindrical specimens were experimentally evaluated through compressive strength, water absorption, void index, and surface electrical resistivity tests, while the numerical simulations were performed using a mesoscale finite element approach considering aggregates, grout, and the interfacial transition zone (ITZ) as distinct phases under elastic loading conditions. Experimental results demonstrated that TSC achieved significantly higher compressive strength (44.66 MPa at 28 days), corresponding to approximately 64% higher strength than CVC, along with reduced water absorption, lower void index, and higher surface electrical resistivity, indicating improved durability-related performance. Numerical simulations were performed using the finite element method under identical loading conditions corresponding to the lowest experimental failure load (21.17 MPa). The results revealed that TSC exhibited lower global displacement (0.115 mm) than CVC (0.125 mm), as well as a wider stress distribution within the coarse aggregate skeleton, with peak stresses reaching approximately 70 MPa, compared to 56 MPa in CVC. Despite this increased stress heterogeneity at the aggregate level, the average stress values in the grout and ITZ remained comparable between both concretes. These findings provide insight into how alternative concrete production methods may influence stiffness development, deformation control, and service-state performance of structural building components.