A Systematic Laboratory Testing of Concrete Corrosion Resistance in Sewers
This chapter developed a Systematic COrrosion REsistance (SCORE) testing to determine the concrete corrosion resistance in urban wastewater systems, primarily sewers. Microbially induced concrete corrosion has a profound impact on the useful service life of concrete sewers, which leads to billions of dollars of economic loss annually. Concrete is widely used in the rehabilitation or construction of new wastewater infrastructure. It is vital to quantitatively measure the corrosion resistance for a reliable and sustainable design. The testing of corrosion resistance is primarily based on the measurements of initiation time and corrosion rate, in combination with corrosion development parameters including surface pH, sulfur compounds, and sulfide uptake rate. The different corrosion parameters support each other to make a cohesive comparison of different concrete products. Two newly developed Calucem concrete products were demonstrated with different corrosion resistance using this testing approach. In addition, advanced microscopic methods and microbial community analysis will help to optimize the concrete design by providing insights into the corrosion resistance. The systematic testing approach has been applied in large-scale concrete sewers and showed its effectiveness in supporting the service life design.
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Engineering and Physical Sciences Research Council