Abstract

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Title:: Experiment on Flexural Toughness of High-strength Self-compacting Concrete with Hybrid Fiber

Author(s):: WANG Jun; XUE He; LI Ting; School of Civil Engineering, Northeast Forestry University

Keywords:: hybrid fiber; high-strength self-compacting concrete; flexural toughness; numerical analysis; flexural toughness ratio

Abstract:: In order to study the toughness function mechanism of concrete modified by hybrid fiber, the copper-coated microfilament steel fiber(SF) and carbon nanofiber(CNF) proportion were taken as parameters, and the high-strength self-compacting concrete with hybrid fiber was prepared to conduct flexural toughness experiment. Based on the experimental data, the load-deflection curves were obtained. The flexural toughness ratio was applied as the quantitative index, and the numerical analysis method was applied to conduct parameter analysis on sample space of specimens. The results show that CNF and SF play modification effect of different levels at different crack stages of high-strength self-compacting concrete. The peak load deformation of concrete is improved, and the ultimate load, initial flexural toughness ratio and flexural toughness ratio are promoted. The initial flexural toughness ratio is increased by 34.5%, and the flexural toughness ratio of HS-S9C6 test group reaches 0.84. The descent rate of flexural toughness ratio is slower along with the increase of deflection. The hybrid fiber play a better role in improving the toughness of highstrength selfcompacting concrete.