Corrosion of Concrete Sewers

Corrosion of concrete sewers is a major problem that can lead to structural failure. The main cause of corrosion is the production of hydrogen sulfide gas from the anaerobic decomposition of sewage solids. This gas can react with water to form sulfuric acid, which can then react with the calcium hydroxide in the concrete to form calcium sulfate. This reaction can cause the concrete to weaken, crack, and crumble over time.

Questions

• What is the most common cause of corrosion in concrete sewers?
• How does corrosion occur in sewer pipes?
• What are the signs of corrosion in concrete sewers?
• How can corrosion in concrete sewers be prevented?

Answers

• The most common cause of corrosion in concrete sewers is the production of hydrogen sulfide gas from the anaerobic decomposition of sewage solids.
• Corrosion occurs in sewer pipes when the sulfuric acid produced from hydrogen sulfide gas reacts with the calcium hydroxide in the concrete.
• The signs of corrosion in concrete sewers include cracks, spalling, and crumbling.
• Corrosion in concrete sewers can be prevented by using corrosion-resistant materials, managing the pH of the wastewater, and preventing the buildup of hydrogen sulfide gas.