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This study investigates the influence of superabsorbent polymers (SAPs) on the mechanical properties of strain-hardening cementitious composites (SHCCs). The effects of SAPs at different dosages (0.3% and 0.6%) were evaluated through compressive strength, Young’s modulus, uniaxial tensile behaviour, and stress relaxation tests. The results indicate that the 0.3% SAP group exhibited similar compressive strength to the control group at 7 days but higher strength at 28 days, whereas the 0.6% SAP group showed strength reduction at both ages. Additionally, the 0.3% SAP group demonstrated enhanced ductility, characterized by a higher tensile strength, increased strain capacity, and a more uniform fine crack distribution. In contrast, the 0.6% SAP group exhibited reduced performance due to excessive void formation. Stress relaxation tests revealed that SAP incorporation improved stress dissipation, with the 0.3% SAP group exhibiting the highest relaxation ratio, followed by the 0.6% SAP and control groups. These findings highlight the potential benefits of SAPs in SHCC applications but also emphasize the importance of optimizing the SAP dosage.

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Tensile Stress Relaxation and Cracking Characteristics of Strain-Hardening Cementitious Composites (SHCC) with Incorporation of Superabsorbent Polymer (SAP)

  • 会议论文

  • 发表日期：

    2025年

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  • Yao Luan,
  • Faizudin Hafiz Zadah,
  • Hideto Kanda

摘要

This study investigates the influence of superabsorbent polymers (SAPs) on the mechanical properties of strain-hardening cementitious composites (SHCCs). The effects of SAPs at different dosages (0.3% and 0.6%) were evaluated through compressive strength, Young’s modulus, uniaxial tensile behaviour, and stress relaxation tests. The results indicate that the 0.3% SAP group exhibited similar compressive strength to the control group at 7 days but higher strength at 28 days, whereas the 0.6% SAP group showed strength reduction at both ages. Additionally, the 0.3% SAP group demonstrated enhanced ductility, characterized by a higher tensile strength, increased strain capacity, and a more uniform fine crack distribution. In contrast, the 0.6% SAP group exhibited reduced performance due to excessive void formation. Stress relaxation tests revealed that SAP incorporation improved stress dissipation, with the 0.3% SAP group exhibiting the highest relaxation ratio, followed by the 0.6% SAP and control groups. These findings highlight the potential benefits of SAPs in SHCC applications but also emphasize the importance of optimizing the SAP dosage.