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<p>The pouring process of self-compacting concrete (SCC) in large-size complex structure remained complex. Based on field experiment of a large-scale cross-river bridge, the Bingham rheological model was used to conduct experimental and numerical analysis of SCC workability tests, and the Einstein-Roscoe equation was modified and used for numerical simulation. Mortar rheology tests indicated that decreasing water-to-binder ratio from 0.42 to 0.33 increased mortar yield stress and plastic viscosity. Analyses of 32 sets of SCC slump-flow and L-box tests under varying mortar film thicknesses and rheologies revealed that increasing mortar film thickness within 2.22–3.33&#xa0;mm increased both slump flow and blocking ratio, whereas mortar rheology decreased them. When the unmodified Einstein-Roscoe equation was used to simulate the plastic viscosity of SCC, the average relative errors compared with experimental values were 3.51% (slump flow) and 6.32% (blocking ratio). With the modified Einstein-Roscoe equation, the errors were reduced to 0.85% and 1.61%, respectively. Simulations in single-chamber configuration and three-chamber configuration demonstrated that each proposed SCC group overcame reinforcing bar blocking effects and filled all chamber parts. The high-rheology SCC exhibited a faster leveling speed after pouring compared to the low-rheology SCC. Entrapped bubbles primarily distributed near stud roots and reinforcing bar roots; higher pouring velocity increased bubble entrapment, whereas higher fluidity reduced it. Compared to double-entrance switching pouring, single-entrance pouring strategy (SCC poured solely from the middle chamber) achieved more uniform SCC filling across three chambers. This study provided effective on-site guidance for similar complex structures.</p>

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Self-compacting concrete pouring in steel chamber for bridge combination joints: Experiments and simulations

  • 期刊论文

  • 发表日期：

    2026年6月1日

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

摘要

The pouring process of self-compacting concrete (SCC) in large-size complex structure remained complex. Based on field experiment of a large-scale cross-river bridge, the Bingham rheological model was used to conduct experimental and numerical analysis of SCC workability tests, and the Einstein-Roscoe equation was modified and used for numerical simulation. Mortar rheology tests indicated that decreasing water-to-binder ratio from 0.42 to 0.33 increased mortar yield stress and plastic viscosity. Analyses of 32 sets of SCC slump-flow and L-box tests under varying mortar film thicknesses and rheologies revealed that increasing mortar film thickness within 2.22–3.33 mm increased both slump flow and blocking ratio, whereas mortar rheology decreased them. When the unmodified Einstein-Roscoe equation was used to simulate the plastic viscosity of SCC, the average relative errors compared with experimental values were 3.51% (slump flow) and 6.32% (blocking ratio). With the modified Einstein-Roscoe equation, the errors were reduced to 0.85% and 1.61%, respectively. Simulations in single-chamber configuration and three-chamber configuration demonstrated that each proposed SCC group overcame reinforcing bar blocking effects and filled all chamber parts. The high-rheology SCC exhibited a faster leveling speed after pouring compared to the low-rheology SCC. Entrapped bubbles primarily distributed near stud roots and reinforcing bar roots; higher pouring velocity increased bubble entrapment, whereas higher fluidity reduced it. Compared to double-entrance switching pouring, single-entrance pouring strategy (SCC poured solely from the middle chamber) achieved more uniform SCC filling across three chambers. This study provided effective on-site guidance for similar complex structures.