Flexural and Tensile Strength of Ultra-High-Performance Concrete with ZnPh-Treated Steel Fibers

Abstract

This study demonstrates the use of novel zinc phosphate (ZnPh)-treated steel fibers in ultra-high-performance concrete (UHPC), replacing the commonly used steel fibers. The effects of ZnPh-treated steel fibers on tensile and flexural strengths of UHPC were investigated through flexural and direct tension tests. The results showed that first cracking strengths were reduced by 9.7% and 0.5% in the flexural and direct tension test specimens, respectively. The ultimate strengths were increased by 16.8% and 18% in the flexural and direct tension test specimens, respectively. Also, in the direct tension test, the ultimate strain at the ultimate strength was increased by 113.1%. scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDX) analyses revealed that a weaker interface exists between the ZnPh covering and the fiber. This interface resulted in reduction of first cracking strengths, whereas the ZnPh covering improved ultimate strengths due to an increase in friction between the fiber and matrix after the ZnPh peeled off.

Department(s)

Materials Science and Engineering

Comments

National Natural Science Foundation of China, Grant 2018-04

Keywords and Phrases

Flexural Strength; Scanning Electron Microscopy-Energy Dispersive X-Ray Spectroscopy (SEM-EDX) Analysis; Tensile Strength; Ultra-High-Performance Concrete (UHPC); Zinc Phosphate (ZnPh); ZnPh-Treated Steel Fibers

International Standard Serial Number (ISSN)

0899-1561; 1943-5533

Document Type

Article - Journal

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2020 American Society of Civil Engineers (ASCE), All rights reserved.

Publication Date

01 Oct 2020

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