Influence of polyethylene fiber parameters on the mechanical properties of high-strength high-ductility concrete: An experimental study and constitutive model

This study explores the effects of PE fiber parameters (length, aspect ratio, and elastic modulus) on the mechanical properties of high-strength high-ductility concrete (HSHDC), focusing on both compressive and tensile behaviors. The results show that enhancements in these parameters primarily affect the tensile properties, with less impact on the compressive properties. An increase in fiber length, aspect ratio and elastic modulus enhance tensile strength, strain, and energy dissipation by approximately 10.1∼34.8%, 10.6∼120%, and 14.1∼186%, respectively. The optimal fiber parameters were identified: when the fiber length was 12 mm with a diameter of 24 μm, the compressive performance of the material was optimal, and when the fiber length was 15 mm with a diameter of 27 μm, the tensile performance of the material was optimal. Moreover, the study proposed a mechanical constitutive model for HSHDC materials, showing good agreement with experimental data.