Work

Triaxial compressive behavior of high-strength strain-hardening fiber-reinforced cementitious composites: Fiber hybridization effect and constitutive relations

Year: 2025

Type: article

Abstract: High-strength ultra-high toughness cementitious composites (HS-UHTCC) are advanced materials characterized by a combination of high compressive strength and remarkable tensile ductility. In this study, the triaxial compressive behavior of HS-UHTCC reinforced with hybrid steel-polyethylene fibers was experimentally investigated under confining pressures up to 120 MPa. The results demonstrated that HS-UHTCC specimens predominantly exhibited oblique shear failure under triaxial loading. With increasing confining pressure, the deviatoric strength, axial/ lateral strain at peak load all increased. Peak stress increased by 244.54 % and 276.20 % as confining pressure increased up to 120 MPa for various fiber hybridizations. Notably, when the confining pressure exceeded 100 MPa, the material ceased to soften and instead exhibited ductile behavior. Among the classical failure criteria studied, both the Power-Law and Willam-Warnke criteria successfully captured the triaxial strength envelope of HS-UHTCC. Finally, a pressure-dependent constitutive model was proposed to characterize the pre-peak hardening, post-peak softening, and brittle-to-ductile transition of HS-UHTCC.

Source: Cement and Concrete Research

DOI: 10.1016/j.cemconres.2025.108049

Authors: Yanxin Hao, Xing Yin, Qinghua Li, Shilang Xu

Institution: Zhejiang University

Language: English

Topic: Innovative concrete reinforcement materials

Subfield: Civil and Structural Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $5,180

Funders: National Natural Science Foundation of China, Zhejiang University, National Postdoctoral Program for Innovative Talents