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A rapid, non-destructive methodology to monitor activity of sulfide-induced corrosion of concrete based on H2S uptake rate

Journal Article


Abstract


  • Many existing methods to monitor the corrosion of concrete in sewers are either very slow or destructive measurements. To overcome these limitations, a rapid, non-invasive methodology was developed to monitor the sulfide-induced corrosion process on concrete through the measurement of the H2S uptake rates of concrete at various corrosion stages. The H2S uptake rate for a concrete coupon was determined by measuring the gaseous H2S concentrations over time in a temperature- and humidity-controlled gas-tight reactor. The reliability of this method was evaluated by carrying out repeated tests on different concrete coupons previously exposed to 50ppm of H2S, at 30°C and 100% relative humidity for over 32 months. The H2S uptake measurements showed good reproducibility. It was also shown that a severely corroded coupon exhibited higher sulfide uptake rates than a less corroded coupon. This could be explained by the corrosion layer in the more corroded coupon having a higher biological sulfide oxidation activity than the less corroded coupon. Additionally, temperature changes had a stronger effect on the uptake rate of the heavily corroded coupon compared to the less corroded coupon. A corrosion rate of 8.9±0.5mm/year, estimated from the H2S uptake results, agreed well with the corrosion rate observed in real sewers under similar conditions. The method could be applied to investigate important factors affecting sulfide-induced concrete corrosion, particularly temperature, fluctuating gaseous H2S concentrations, oxygen concentrations, surface pH and relative humidity. © 2014 Elsevier Ltd.

UOW Authors


  •   Sun, Xiaoyan (external author)
  •   Jiang, Guangming
  •   Bond, Philip (external author)
  •   Wells, Tony (external author)
  •   Keller, Jurg (external author)

Publication Date


  • 2014

Citation


  • Sun, X., Jiang, G., Bond, P. L., Wells, T. & Keller, J. (2014). A rapid, non-destructive methodology to monitor activity of sulfide-induced corrosion of concrete based on H2S uptake rate. Water Research, 59 229-238.

Scopus Eid


  • 2-s2.0-84899880351

Number Of Pages


  • 9

Start Page


  • 229

End Page


  • 238

Volume


  • 59

Place Of Publication


  • United Kingdom

Abstract


  • Many existing methods to monitor the corrosion of concrete in sewers are either very slow or destructive measurements. To overcome these limitations, a rapid, non-invasive methodology was developed to monitor the sulfide-induced corrosion process on concrete through the measurement of the H2S uptake rates of concrete at various corrosion stages. The H2S uptake rate for a concrete coupon was determined by measuring the gaseous H2S concentrations over time in a temperature- and humidity-controlled gas-tight reactor. The reliability of this method was evaluated by carrying out repeated tests on different concrete coupons previously exposed to 50ppm of H2S, at 30°C and 100% relative humidity for over 32 months. The H2S uptake measurements showed good reproducibility. It was also shown that a severely corroded coupon exhibited higher sulfide uptake rates than a less corroded coupon. This could be explained by the corrosion layer in the more corroded coupon having a higher biological sulfide oxidation activity than the less corroded coupon. Additionally, temperature changes had a stronger effect on the uptake rate of the heavily corroded coupon compared to the less corroded coupon. A corrosion rate of 8.9±0.5mm/year, estimated from the H2S uptake results, agreed well with the corrosion rate observed in real sewers under similar conditions. The method could be applied to investigate important factors affecting sulfide-induced concrete corrosion, particularly temperature, fluctuating gaseous H2S concentrations, oxygen concentrations, surface pH and relative humidity. © 2014 Elsevier Ltd.

UOW Authors


  •   Sun, Xiaoyan (external author)
  •   Jiang, Guangming
  •   Bond, Philip (external author)
  •   Wells, Tony (external author)
  •   Keller, Jurg (external author)

Publication Date


  • 2014

Citation


  • Sun, X., Jiang, G., Bond, P. L., Wells, T. & Keller, J. (2014). A rapid, non-destructive methodology to monitor activity of sulfide-induced corrosion of concrete based on H2S uptake rate. Water Research, 59 229-238.

Scopus Eid


  • 2-s2.0-84899880351

Number Of Pages


  • 9

Start Page


  • 229

End Page


  • 238

Volume


  • 59

Place Of Publication


  • United Kingdom