Testing of Sulfide Uptake Rate (SUR) and Its Applications

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Engineering Materials


This chapter introduces a methodology to measure the rate of gaseous H2S transferring from sewer atmosphere to the exposed concrete surface. This facilitates the monitoring of sulfide-induced corrosion processes on concrete at various corrosion stages. In comparison to many existing methods, this methodology has the advantages of rapid measurement and non-destruction of the concrete sample. The H2S uptake rate (SUR) for a concrete coupon can be 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 concrete coupons previously exposed to different corrosion conditions. The method could be applied to perform various research activities related to microbiologically influenced concrete corrosion, for instance, (1) understand sulfide uptake activity by concrete; (2) differentiate chemical and biological driven sulfide uptake activity; (3) evaluate the effectiveness of concrete control techniques; (4) estimate concrete corrosion rate in sewer systems; (5) investigate important factors affecting sulfide-induced concrete corrosion, particularly temperature, fluctuating gaseous H2S concentrations, oxygen concentrations, surface pH and relative humidity (RH).

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