Flexural Performance and Prediction Model of High-strength ECC with Hybrid Fiber
WAN Siyu1, SU Sanqing1, CAO Zhen2,*, WANG Zhaoyao3
1 School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China 2 School of Urban Development and Modern Transportation, Xi’an University of Architecture and Technology, Xi’an 710055, China 3 School of Science, Xi’an University of Architecture and Technology, Xi’an 710055, China
Abstract: High-strength engineered cementitious composite (HS-ECC) holds promising application prospects in civil engineering, and a thorough understanding of their flexural properties is essential for practical engineering applications. Currently, there is a relative lack of research on the hybrid reinforcement mechanism of polyethylene fibers (PEF) and steel fibers (SF) in HS-ECC, and effective predictive models for flexural properties are also lacking. To address this, the influence of hybrid PEF-SF fiber content and hyrbid ratio on the workability, compressive strength, and flexural properties of HS-ECC were investigated through slump tests, compressive strength tests, and four-point bending tests. Furthermore, a predictive model for flexural properties was established. The results indicate that both PEF and SF degrade the cementitous composite’s workability, with PEF having a more significant negative impact. SF exhibits a more pronounced enhancement effect on flexural strength and compressive strength, but the fiber reinforcement efficiency decreases with the increasing of fiber content. Both PEF and SF contribute to increasing peak deflection, with higher PEF content being beneficial for enhancing deformability, whereas excessive SF content can weaken the deflection hardening characteristics and affect flexural performance. Considering strength, deformability, and cost, the SF content should not exceed 0.6%. Based on micro-analysis, a uniaxial tensile/compressive constitutive model for HS-ECC was proposed, and a predictive model for flexural properties was established. This model can effectively predict the flexural properties of PEF-SF hybrid HS-ECC, providing theoretical support for its application in practical engineering.
万思宇, 苏三庆, 曹振, 王照耀. 混杂纤维高强高延性水泥基复合材料弯曲性能及预测模型[J]. 材料导报, 2025, 39(23): 24120022-10.
WAN Siyu, SU Sanqing, CAO Zhen, WANG Zhaoyao. Flexural Performance and Prediction Model of High-strength ECC with Hybrid Fiber. Materials Reports, 2025, 39(23): 24120022-10.
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2025, Vol. 39 
