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<p>This study investigated the impact resistance of steam-cured rubber concrete (SCRC) using a Φ50 mm split Hopkinson pressure bar (SHPB) system, with a focus on evaluating the effects of rubber aggregates and their modification methods (via NaOH or a silane coupling agent, SCA). The effect of crumb rubber on the impact performance of steam-cured concrete was simulated using the ABAQUS finite element method (FEM), whereas the action mechanism of the two modification methods was investigated through molecular dynamics simulation. The results indicated that incorporating rubber aggregates increased the impact resistance of the steam-cured concrete. Furthermore, owing to their improved interfacial bonding with the cement binder, the modified rubber particles substantially increased the energy absorption capacity under high-speed impact. The results indicate a significant increase in the dynamic strength with increasing rubber content. Compared with the control group (RC0), the SCRC mixtures with rubber contents of 35, 70, and 105&#xa0;kg/m³ exhibited increases of 15.9%, 32.0%, and 57.3%, respectively. In the concrete mixed with modified rubber particles, the dynamic increase factor (<i>DIF</i><sub>c</sub>) values of MRC35-20% (with NaOH-modified rubber particles) and MRC35-SCA (with SCA-modified rubber particles) increased by approximately 14.1 and 18.5%, respectively, compared with those of sample RC35 (with unmodified rubber particles). The ABAQUS simulation results were consistent with the dynamic test data for visualizing the crack development process of concrete under high-speed impact loading. The molecular dynamics simulation results reveal that rubber modification can significantly increase the interaction energy between rubber molecules and the C–H–S molecular interface, with the most obvious effect observed after NaOH modification.</p>

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Investigation on the impact resistance of steam-cured (modified) rubber concrete: experiment and simulations

  • 期刊论文

  • 发表日期：

    2026年5月13日

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  • Junlin An,
  • Yong Yu,
  • Zuquan Jin,
  • Dongxian Shen,
  • Ning Li,
  • Shijie Lian

摘要

This study investigated the impact resistance of steam-cured rubber concrete (SCRC) using a Φ50 mm split Hopkinson pressure bar (SHPB) system, with a focus on evaluating the effects of rubber aggregates and their modification methods (via NaOH or a silane coupling agent, SCA). The effect of crumb rubber on the impact performance of steam-cured concrete was simulated using the ABAQUS finite element method (FEM), whereas the action mechanism of the two modification methods was investigated through molecular dynamics simulation. The results indicated that incorporating rubber aggregates increased the impact resistance of the steam-cured concrete. Furthermore, owing to their improved interfacial bonding with the cement binder, the modified rubber particles substantially increased the energy absorption capacity under high-speed impact. The results indicate a significant increase in the dynamic strength with increasing rubber content. Compared with the control group (RC0), the SCRC mixtures with rubber contents of 35, 70, and 105 kg/m³ exhibited increases of 15.9%, 32.0%, and 57.3%, respectively. In the concrete mixed with modified rubber particles, the dynamic increase factor (DIFc) values of MRC35-20% (with NaOH-modified rubber particles) and MRC35-SCA (with SCA-modified rubber particles) increased by approximately 14.1 and 18.5%, respectively, compared with those of sample RC35 (with unmodified rubber particles). The ABAQUS simulation results were consistent with the dynamic test data for visualizing the crack development process of concrete under high-speed impact loading. The molecular dynamics simulation results reveal that rubber modification can significantly increase the interaction energy between rubber molecules and the C–H–S molecular interface, with the most obvious effect observed after NaOH modification.