11.4.3. Sulfate Attack

Try these first

1. 1.

   Define sulfate attack.

   Hint

   Think about what happens when certain chemicals meet in cement.

2. 2.

   What does C₃A stand for in cement?

   Hint

   It is one of the main compounds found in cement.

3. 3.

   What is the primary cause of sulfate attack in concrete?

   • Presence of water
   • Reaction of sulfate ions with C₃A
   • Poor curing practices

   Hint

   Consider what component in the cement reacts with sulfates.

4. 4.

   True or False: Gypsum and ettringite are harmless in small amounts in concrete.

   • True
   • False

   Hint

   Think about the implications of expansion in concrete.

5. 5.

   Given a concrete structure located near the ocean, detail an approach to mitigate potential sulfate attacks during the design phase.

   Hint

   Think about both materials and methods.

6. 6.

   Analyze a structure exhibiting signs of sulfate attack. What steps would you recommend for both immediate repairs and long-term solutions?

   Hint

   Break down your analysis into urgent versus preventative measures.