This technology features curved steel fibers designed with a consistent curvature and radius from end to end, incorporating a hollow, through-hole interior space connecting both ends.
While ultra-high-strength cement-based composites can improve tensile performance using steel fibers, conventional straight fibers used for standard concrete often break or pull out, failing to provide effective reinforcement. Fibers with localized deformations, such as bent ends, also suffer from stress concentration at the bends, leading to fiber rupture or damage to the surrounding concrete.
This technology maintains a constant curvature of 0.02–0.10 mm⁻¹ and a radius of 10–50 mm to prevent localized stress under tensile loads, while through-holes on the outer surface enhance bonding with the cement matrix. Multiple fibers can be connected in series using beeswax or paraffin wax (melting point 60–80°C) to form spring-like modules. Applicable to UHPFRC members, impact/blast-resistant structures, and high-strength precast beams and slabs, it increases tensile deformation capacity and energy absorption without fiber rupture or pull-out.
This invention was developed with support from the Ministry of Science and ICT for the development of ultra-high-strength, ultra-high-toughness cement composites and micromechanics-based analysis technology considering strain rate effects.
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