Fiber alignment and its effect on mechanical properties of UHPC: An overview

By Huanghuang Huang, Xiaojian Gao, L. Teng. 2021

164 citations recorded by the source corpus.

Abstract Ultra-high performance concrete (UHPC) is attracting increasing interests worldwide due to its excellent mechanical properties and durability. Securing fiber alignment corresponding to the direction of principal tensile stress can greatly enhance the mechanical performance, especially flexural and tensile properties of UHPC. In this paper, an overview on fiber alignment and its effect on mechanical properties of UHPC is presented. The changes in flow patterns of mixture and the assistance of electromagnetic field during casting can lead to a higher improvement in fiber orientation (up to 80%) compared to other fiber alignment methods. Quasi-static flexural strength, toughness, and tensile strength can be enhanced by 10%-80%, 20%-100%, and 30%-90%, respectively, for UHPC with fiber alignment compared to those with random fiber orientation. This can enable up to 2% reduction in fiber volume needed to secure a similar mechanical performance. Such fiber alignment can increase the dynamic compressive strength and flexural strength by up to 20% and 50%, respectively. Moreover, fiber alignment can lead to the reduction of electrical resistance and improvement of self-sensing ability of UHPC due to the formation of a more complete conductive network. To promote the research and application of fiber alignment in UHPC, the alignment of flexible fibers that can bend in mixtures and the alignment of fibers in mixtures containing coarse aggregates where fiber alignment can be interfered should be further investigated. Furthermore, practical applications of fiber alignment in UHPC structural elements should be advanced.

Subfields: Building and Construction, Civil and Structural Engineering

View Paper: https://www.semanticscholar.org/paper/fc9ee3c541a0067cf82068ef971d42540cefb6f8

How researchers see this paper

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In Building and Construction

1. C. Shi
2. Chi-Sun Poon

In Civil and Structural Engineering

1. Qingli Yu
2. Weitan Zhuang
3. C. Shi
4. J. Provis
5. Chi-Sun Poon
6. Zuhua Zhang
7. S. A. Bernal
8. Zemei Wu

Citations in the corpus

• Research progress on the dynamic compressive properties of ultra-high performance concrete under high strain rates (2021, background): “(3) Effects of steel fiber orientation In addition to the content and type of steel fiber, fiber orientation also exerts an essential role in the mechanical properties of UHPC [79 – 82].”