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<p>Buildings on islands and reefs face harsh environmental conditions, requiring concrete with high ductility and dynamic resistance. Moreover, sourcing conventional building materials in these regions is often challenging. Engineered cementitious composites (ECC) incorporating locally available marine materials offer potential advantages in mechanical performance, as well as being more economical and environmentally friendly. In this context, this study investigated the dynamic mechanical behavior of ECC incorporating marine resources, using coral sand as a quartz sand substitute, seawater as mixing water, and coral powder as a partial cement replacement. The split Hopkinson pressure bar (SHPB) method was employed to assess the dynamic compressive behavior of ECC specimens. Key properties analyzed included dynamic stress-strain curves, compressive strength, peak strain, failure patterns, dynamic increase factor (DIF), and specific energy absorption (SEA). Results showed that all ECC specimens exhibited significant strain-rate sensitivity, with compressive strength, peak strain, DIF, and SEA increasing at higher strain rates. Coral sand substitution reduced compressive strength but improved peak strain, DIF, and SEA. Seawater use enhanced compressive strength while decreasing peak strain, DIF, and SEA. Increasing coral powder content lowered compressive strength but raised peak strain, with DIF and SEA peaking at 20% coral powder. A 20% coral powder content was found to optimize overall dynamic performance while also offering notable economic and environmental benefits. To further understand and predict the dynamic behavior of ECC, a ZWT viscoelastic constitutive model with damage evolution was developed and successfully captured the stress-strain responses of ECC observed under varying strain rates. The model was implemented in ABAQUS using a VUMAT subroutine to simulate three-dimensional impact compression failure. The simulation results validated the experimental findings. This study provides a practical approach for developing eco-friendly ECC with satisfactory dynamic mechanical performance for island and coastal infrastructure.</p>

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Eco-engineered Cementitious Composites Incorporating Marine Resources: Dynamic Mechanical Properties and Numerical Simulation

  • 期刊论文

  • 发表日期：

    2025年11月20日

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  • Xiaochun Fan,
  • Jiakun Zhu,
  • Xu Gao

摘要

Buildings on islands and reefs face harsh environmental conditions, requiring concrete with high ductility and dynamic resistance. Moreover, sourcing conventional building materials in these regions is often challenging. Engineered cementitious composites (ECC) incorporating locally available marine materials offer potential advantages in mechanical performance, as well as being more economical and environmentally friendly. In this context, this study investigated the dynamic mechanical behavior of ECC incorporating marine resources, using coral sand as a quartz sand substitute, seawater as mixing water, and coral powder as a partial cement replacement. The split Hopkinson pressure bar (SHPB) method was employed to assess the dynamic compressive behavior of ECC specimens. Key properties analyzed included dynamic stress-strain curves, compressive strength, peak strain, failure patterns, dynamic increase factor (DIF), and specific energy absorption (SEA). Results showed that all ECC specimens exhibited significant strain-rate sensitivity, with compressive strength, peak strain, DIF, and SEA increasing at higher strain rates. Coral sand substitution reduced compressive strength but improved peak strain, DIF, and SEA. Seawater use enhanced compressive strength while decreasing peak strain, DIF, and SEA. Increasing coral powder content lowered compressive strength but raised peak strain, with DIF and SEA peaking at 20% coral powder. A 20% coral powder content was found to optimize overall dynamic performance while also offering notable economic and environmental benefits. To further understand and predict the dynamic behavior of ECC, a ZWT viscoelastic constitutive model with damage evolution was developed and successfully captured the stress-strain responses of ECC observed under varying strain rates. The model was implemented in ABAQUS using a VUMAT subroutine to simulate three-dimensional impact compression failure. The simulation results validated the experimental findings. This study provides a practical approach for developing eco-friendly ECC with satisfactory dynamic mechanical performance for island and coastal infrastructure.