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Abstract

To clarify the effect of steel fiber content on axial tensile performance of ultra-high performance concrete (UHPC) materials, this paper conducted axial tensile full process tests on 16 UHPC specimens from four groups with steel fiber volume content ranging from 0% to 3%. As a result, the stress strain curves of UHPC under different fiber contents were obtained. Additionally, the effect of steel fiber content on the tensile strength, deformation performance, energy consumption ability, and ductility of UHPC was analyzed. The experimental results show that UHPC axial tensile specimens without steel fiber exhibit obvious brittle failure characteristics of single joint cracking. When the fiber content increases to more than 2%, obvious ductility failure characteristics of multiple joint cracking is shown. The uploading curve and other UHPC axial tensile stress strain curves show approximate linear variation between the initial loading, matrix cracking, and characteristic points such as the peak point, limit point, and unloading point. When the limit point is reloaded after unloading, the path of the monotonic loading curve is still basically returned to. As the steel fiber content increases, the initial crack stress and strain of UHPC materials slightly rise, with the significantly improved peak stress, peak strain, limit strain, residual strain, energy consumption ability, and ductility. The elastic moduli under tension and compression are similar, and the plastic energy consumption ability of the materials is mainly provided by the plastic deformation of the fibers in the matrix.

Publication Date

11-8-2022

DOI

10.14048/j.issn.1671-2579.2022.05.022

First Page

120

Last Page

123

Submission Date

April 2025

Reference

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