FraMCoS 7 2010 Jeju, South Korea

Fracture energy of UHP FRC under direct tensile loading

A research was conducted to investigate and improve the fracture energy of ultra high perform- ance fiber reinforced concretes (UHP-FRC) using relatively low fiber contents. Seven different UHP-FRCs incorporating different types and amounts of high strength steel fibers were tested…

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Year 2010
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Abstract

A research was conducted to investigate and improve the fracture energy of ultra high perform- ance fiber reinforced concretes (UHP-FRC) using relatively low fiber contents. Seven different UHP-FRCs incorporating different types and amounts of high strength steel fibers were tested in tension, using double- bell shaped tensile prisms. The UHP-FRCs were first optimized to achieve a compressive strength of about 200 MPa, without applying any heat curing treatment or pressure. The high strength steel fibers used were smooth, hooked-ends or twisted. Particular attention was placed to measuring the strain-hardening and soften- ing performance of the composite in order to accurately evaluate the dissipated energy per unit area and per 2 unit volume. An optimized UHP-FRC with 1.5 % twisted steel fibers by volume exceeded 30 kJ/m in frac- ture energy. This is about one and a half the fracture energy reported from other comparable UHP-FRC.