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

杨海涛^1,2,3，刘娟红^1,2,3，XUE Yanpeng⁴，ZHOU Yucheng^1,2,3，JI Hongguang^1,2,3

1. College of Civil and Resource Engineering, University of Science and Technology Beijing2. Beijing Key Laboratory of Urban Underground Space Engineering, University of Science and Technology Beijing3. State Key Laboratory of High-efficient Mining and Safety of Metal Mines, Ministry of Education, University of Science and Technology Beijing4. National Center for Materials Service Safety, University of Science and Technology Beijing

摘 要：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 ℃ were 1% and 2%,respectively.When the temperature reached 50 ℃,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.

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