Mechanical properties of steel, glass, and hybrid fiber reinforced reactive powder concrete

Abstract

This study examines the properties of fiber-reinforced reactive powder concrete (FR-RPC). Steel fibers, glass fibers, and steel-glass hybrid fibers were used to prepare the FR-RPC. The non-fibrous reactive powder concrete (NF-RPC) was prepared as a reference mix. The proportion of fibers by volume for all FR-RPC mixes was 1.5%. Steel fibers of 13 mm length and 0.2 mm diameter were used to prepare the steel fiber-reinforced RPC (SFR-RPC). Glass fibers of 13 mm length and 1.3 mm diameter were used to prepare the glass fiber-reinforced RPC (GFR-RPC). The hybrid fiber-reinforced RPC (HFR-RPC) was prepared by mixing 0.9% steel fibers and 0.6% glass fibers. Compressive strength, axial load-axial deformation behavior, modulus of elasticity, indirect tensile strength, and shear strength of the RPC mixes were investigated. The results showed that SFR-RPC achieved higher compressive strength, indirect tensile strength and shear strength than NF-RPC, GFR-RPC, and HFR-RPC. Although the compressive strengths of GFR-RPC and HFR-RPC were slightly lower than the compressive strength of NF-RPC, the shear strengths of GFR-RPC and HFR-RPC were higher than that of NF-RPC.

Keywords

reactive powder concrete / steel fiber / glass fiber / hybrid fiber

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Acknowledgment

The authors acknowledge the University of Wollongong, Australia, for the financial support to this experimental study. The authors acknowledge, Australasian (iron and steel) Slag Association for the free supply of the silica fume. The first author would like to acknowledge the Iraqi government for the full financial support to his PhD study. Special thanks to all technical staff in the Structural Engineering laboratories at the University of Wollongong, Australia.

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