Abstract
The effects of pre-corroded steel fibers on mechanical strength of ultra-high performance concrete (UHPC) and interface bond performance between UHPC and normal concrete (NC) were investigated. To obtain corrosion degree of 2.5%, 5%, 7.5% and 10% by weight, steel fibers were pre-corroded in 3.5 wt% NaCl solution and then used to fabricate UHPC. The bond strength of UHPC-NC interface was evaluated by double-sided direct shear test and three-point bending test. The observation of corroded steel fibers by optical microscope (OM) shows that the surface roughness increases with the corrosion degree increases. Overall, the compressive strength, flexural strength and tensile strength of UHPC gradually decrease with increasing the corrosion degree of steel fibers. By contrast, the bond strength of UHPC-NC interface increases as the corrosion degree increases, both the NC substrate with rough surface and smooth surface. Additionally, rough surface on NC substrate effectively enhances the adhesion of UHPC-NC interface.
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