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<p>Based on problems in actual engineering construction, this paper utilized the coupling smoothed particle hydrodynamics (SPH) and discrete element method (DEM) to study the segregation of fresh self-compacting concrete (SCC). The relationship between rheological parameters of mortar and SCC was established using mortar film thickness theory. Rheological tests were performed on mortar with different water-to-binder ratios. The Bingham model for mortar was fitted via least squares, providing rheological parameters for SPH-DEM simulation. The coupling SPH-DEM simulated slump-flow and L-box tests, with mortar represented by SPH units and coarse aggregates represented by DEM particles. Results showed average relative errors of 2.1% for slump flow and 3.5% for blocking ratio. Simulation and experimental values agreed closely, supporting this approach to study SCC segregation. Numerical simulations of vibration-induced segregation were conducted, quantitatively analyzing coarse aggregate settling. Effects of water-to-binder ratio, mortar rheology, and mortar film thickness on segregation ratio were examined. When mortar film thickness ranged from 2.22 to 3.33&#xa0;mm, the segregation ratio decreased with increasing thickness. This study could provide effective guidance for SCC engineering application.</p>

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Study the segregation of fresh self-compacting concrete via coupling smoothed particle hydrodynamics and discrete element method

  • 期刊论文

  • 发表日期：

    2026年1月7日

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  • Fengqiang Hu,
  • Tongyang Bai,
  • Bin Lei,
  • Wei Jiang

摘要

Based on problems in actual engineering construction, this paper utilized the coupling smoothed particle hydrodynamics (SPH) and discrete element method (DEM) to study the segregation of fresh self-compacting concrete (SCC). The relationship between rheological parameters of mortar and SCC was established using mortar film thickness theory. Rheological tests were performed on mortar with different water-to-binder ratios. The Bingham model for mortar was fitted via least squares, providing rheological parameters for SPH-DEM simulation. The coupling SPH-DEM simulated slump-flow and L-box tests, with mortar represented by SPH units and coarse aggregates represented by DEM particles. Results showed average relative errors of 2.1% for slump flow and 3.5% for blocking ratio. Simulation and experimental values agreed closely, supporting this approach to study SCC segregation. Numerical simulations of vibration-induced segregation were conducted, quantitatively analyzing coarse aggregate settling. Effects of water-to-binder ratio, mortar rheology, and mortar film thickness on segregation ratio were examined. When mortar film thickness ranged from 2.22 to 3.33 mm, the segregation ratio decreased with increasing thickness. This study could provide effective guidance for SCC engineering application.