4.1. Nature of Corrosion in Concrete

Try these first

1. 1.

   What is corrosion?

   Hint

   Think about what happens to metals in humid environments.

2. 2.

   Name one cause of corrosion.

   Hint

   Consider environmental factors that affect metal.

3. 3.

   What substance lowers the pH of concrete, initiating corrosion?

   • Chloride
   • Carbon dioxide
   • Moisture

   Hint

   Think about the chemical processes involved in corrosion.

4. 4.

   True or False: Galvanic corrosion occurs between dissimilar metals.

   • True
   • False

   Hint

   Consider how the interaction of different metals can impact corrosion.

5. 5.

   Design a maintenance plan for a coastal bridge suffering from sulfate attack that also faces moisture and chloride exposure.

   Hint

   Consider both preventive and restorative actions.

6. 6.

   Explain how the principles of electrochemistry contribute to the detection of corrosion in rebar.

   Hint

   Think about how potential differences relate to corrosion reactions.