Effects of Hybrid Glass Fiber and Steel Fiber on Dynamic Splitting Tensile Properties of Seawater Coral Sand Engineered Cementitious Composites

doi:10.16552/j.cnki.issn1001-1625.2025.0493

Abstract

Abstract: The use of seawater coral sand to prepare engineered cementitious composites in island reef engineering construction has the advantages of controlling engineering cost and shortening engineering construction period. In order to study the effect of volume fraction of glass fiber (GF) and steel fiber (SF) on the dynamic splitting tensile properties of seawater coral sand engineered cementitious composites (SCECC), the dynamic and static splitting tensile properties of SCECC with different volume fractions of GF instead of SF were tested. The effects of volume ratio of GF and SF and stress rate on energy dissipation characteristics, dynamic intensity growth factor (DIF), dynamic splitting tensile strength and tensile strain field of SCECC were discussed. The results show that the addition of SF and GF reduces the static splitting tensile strength of SCECC with the increase of volume fraction of GF. When the volume fraction of GF is 0% and the volume fraction of SF is 1.500%, the static splitting tensile strength increases by 33.56%. When the volume ratio of GF to SF is 1:3 and the stress rate is 377.08 GPa/s, the dynamic splitting tensile strength reaches the maximum value of 22.33 MPa. With the increase of stress rate, the sensitivity of DIF of SCECC to stress rate increases, and the maximum DIF is 2.58. Under the stress rate grade Ⅳ (371.29~381.46 GPa/s), the dissipation rate of SCECC increased by 34.54%. The hybrid incorporation of SF and GF improves the fracture mode and transforms the crack from single crack to multiple cracks. The analysis of digital image correlation technique shows that the incorporation of SF and GF can alleviate the strain concentration and enhance the damage resistance of SCECC.

Key words: seawater coral sand engineered cementitious composite, glass fiber, steel fiber, dynamic splitting tensile strength, energy dissipation, strain rate effect

CLC Number:

TU528

QIN Yulin, MU Chaomin, ZHANG Xiaoyu, ZHONG Meiting, ZHANG Yu. Effects of Hybrid Glass Fiber and Steel Fiber on Dynamic Splitting Tensile Properties of Seawater Coral Sand Engineered Cementitious Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(10): 3547-3561.

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