Title:
Corrosion Behavior of Conventional and Corrosion-Resistant Steel Reinforcements in High-Performance and Ultra-High-Performance Concrete
Author(s):
Ben Wang, Abdeldjelil Belarbi, Mina Dawood, and Bora Gencturk
Publication:
Materials Journal
Volume:
120
Issue:
6
Appears on pages(s):
141-152
Keywords:
corrosion; high-performance concrete (HPC); mass loss; steel reinforcement; ultra-high-performance concrete (UHPC)
DOI:
10.14359/51739153
Date:
12/1/2023
Abstract:
This paper presents the findings of an experimental study on
the corrosion performance of both conventional and corrosionresistant steel reinforcements in normal-strength concrete (NC), high-performance concrete (HPC), and ultra-high-performance concrete (UHPC) columns in an accelerated corrosion-inducing environment for up to 24 months. Half-cell potential (HCP), linear polarization resistance (LPR), and electrochemical impedance spectroscopy (EIS) methods were used to assess the corrosion activities and corrosion rates. The reinforcement mass losses were directly measured from the specimens and compared to the results from electrochemical corrosion rate measurements. It was concluded that UHPC completely prevents corrosion of reinforcement embedded inside, while HPC offers higher protection than NC in the experimental period. Based on electrochemical measurements, the average corrosion rate of mild steel and high-chromium steel reinforcement in NC in 24 months were, respectively, 6.6 and 2.8 times that of the same reinforcements in HPC. In addition, corrosion-resistant steel reinforcements including epoxycoated reinforcing bar, high-chromium steel reinforcing bar, and stainless-steel reinforcing bar showed excellent resistance to corrosion compared to conventional mild steel reinforcement. There was no active corrosion observed for epoxy-coated and stainless steel
reinforcements during the 24 months of the accelerated aging; the
average corrosion rateS of high-chromium steel was 50% of that of
mild steel in NC based on the electrochemical corrosion measurements; and the average mass loss of high-chromium steel was 47% and 75% of that of mild steel in NC and HPC, respectively. The results also showed that the LPR method might slightly overestimate the corrosion rate. Finally, pitting corrosion was found to be the dominant type of corrosion in both mild and high-chromium steel reinforcements in NC and HPC columns.
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