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Title: Tensile Behavior of Normal-Strength Steel-Fiber Green Ultra-High-Performance Fiber-Reinforced Concrete

Author(s): J. Abellán-García, J. A. Fernández-Gómez, N. Torres-Castellanos, and A. M. Núñez-López

Publication: Materials Journal

Volume: 118

Issue: 1

Appears on pages(s): 127-138

Keywords: commercially available fibers; composite; direct tensile behavior; supplementary cementitious materials (SCM); ultra-highperformance fiber-reinforced concrete (UHPFRC)

Date: 1/1/2021

Abstract:
This paper investigates the tensile behavior of green ultra-high-performance fiber-reinforced concrete (UHPFRC) using commercially available steel fibers. An ecofriendly ultra-high-performance concrete (UHPC) with a low carbon footprint was developed, aiming for a compressive strength of 150 MPa (22 ksi) and a high packing density (0.81) while using recycled glass powder and micro-limestone powder as partial substitution of silica fume and ordinary portland cement. Besides the commercially available normal-strength deformed steel fibers, high-strength smooth steel fibers were used to establish a comparison. The study showed that, with appropriate hooked normal-strength and smooth high-strength steel fibers, 1% of fiber is enough to achieve strain hardening behavior. Moreover, the smooth fibers achieved the maximum tensile strength (σpc = 11.04 MPa) when 2% of volume was used. However, despite having less tensile strength, only the hooked-end fibers achieved a maximum post-cracking strain (εpc) of over 0.3% using 2% of volume.


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