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During the formation process of cement-based composite materials, the interior exhibits strong alkalinity, and the ability of fibers to enhance Engineered Cementitious Composites (ECC) largely depends on the fibers' good alkali resistance. In this study, polyvinyl alcohol (PVA) and polyethylene (PE) fibers were selected to simulate the effects of an alkaline mortar environment on the physicochemical properties and mechanical properties of fibers, and ECC with high strain hardening characteristics were prepared based on the properties of the two fibers. The workability and mechanical properties of ECC were evaluated through flowability tests, compressive tests, and flexural tests. Experimental results show that PE fibers exhibit stable performance in the simulated alkaline mortar environment, with retention rates of fracture strength and tensile strain at 91.64% and 95.05% after soaking for 3 days, respectively. In comparison, the retention rates of fracture strength and tensile strain of PVA fibers are 85.09% and 60.16%, respectively. Mortar performance tests demonstrate that at a PE content of 2.5% and a water-to-binder ratio of 0.27, the ultimate tensile strength reaches 7.1 MPa and the ultimate tensile strain reaches 6.6%. For PVA fibers at a content of 2.5% and a water-to-binder ratio of 0.31, PVA-ECC exhibits the maximum ultimate tensile strength and ultimate tensile strain, at 4.7 MPa and 1.4%, respectively. The incorporation of PE fibers in ECC results in better strain hardening characteristics due to the stronger alkali resistance of PE fibers. The high strength and high elastic modulus characteristics of PE fibers are well matched with the high-strength mortar matrix, and the energy dissipation bridging effect of fibers is significant. This study for the first time identifies the influence of fiber alkali corrosion resistance on the mechanical properties of ECC, providing experimental support and reference for the selection and proportioning of fiber raw materials in the preparation of high-strength and high-ductility ECC.

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Physicochemical Properties of PVA and PE Fibers and Their Impact on the Mechanical Properties of Cement-Based Composite Materials

  • 会议论文

  • 发表日期：

    2025年

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  • Shun Dong,
  • Yaosheng Tan,
  • Qi Lu,
  • Gang Liu,
  • Chao Gao,
  • Ya Cao

摘要

During the formation process of cement-based composite materials, the interior exhibits strong alkalinity, and the ability of fibers to enhance Engineered Cementitious Composites (ECC) largely depends on the fibers' good alkali resistance. In this study, polyvinyl alcohol (PVA) and polyethylene (PE) fibers were selected to simulate the effects of an alkaline mortar environment on the physicochemical properties and mechanical properties of fibers, and ECC with high strain hardening characteristics were prepared based on the properties of the two fibers. The workability and mechanical properties of ECC were evaluated through flowability tests, compressive tests, and flexural tests. Experimental results show that PE fibers exhibit stable performance in the simulated alkaline mortar environment, with retention rates of fracture strength and tensile strain at 91.64% and 95.05% after soaking for 3 days, respectively. In comparison, the retention rates of fracture strength and tensile strain of PVA fibers are 85.09% and 60.16%, respectively. Mortar performance tests demonstrate that at a PE content of 2.5% and a water-to-binder ratio of 0.27, the ultimate tensile strength reaches 7.1 MPa and the ultimate tensile strain reaches 6.6%. For PVA fibers at a content of 2.5% and a water-to-binder ratio of 0.31, PVA-ECC exhibits the maximum ultimate tensile strength and ultimate tensile strain, at 4.7 MPa and 1.4%, respectively. The incorporation of PE fibers in ECC results in better strain hardening characteristics due to the stronger alkali resistance of PE fibers. The high strength and high elastic modulus characteristics of PE fibers are well matched with the high-strength mortar matrix, and the energy dissipation bridging effect of fibers is significant. This study for the first time identifies the influence of fiber alkali corrosion resistance on the mechanical properties of ECC, providing experimental support and reference for the selection and proportioning of fiber raw materials in the preparation of high-strength and high-ductility ECC.