Corrosion Behavior of Steel Fibers in Reactive Powder Concrete with High Volume of Mineral Admixtures

Abstract

The corrosion behavior and the effects of temperature on critical chloride content (C _crit) of steel fibers in RPC were analyzed by a pH meter, ion chromatography, mercury intrusion porosimetry (MIP), and electrochemical techniques. It was found that the suspension pH value, the chloride binding capacity, and the total porosity of RPC were lower than those of high-performance concrete (HPC). The pore structure of RPC mainly consisted of gel pores. The C _crit values of steel fibers in RPC and HPC at 20 °C were 1% and 2%, respectively. When the temperature reached 50 °C, the C _crit value of steel fibers in HPC decreased significantly, whereas it remained unchanged in RPC. The corrosion rate of corroded fibers in both RPC and HPC started to decrease with the rise in temperature.

Keywords

corrosion / steel fibers / chloride / reactive powder concrete / critical chloride content

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