7.2. Sulphate Attack: Foundation Failure in Black Cotton Soil

Try these first

1. 1.

   What is sulphate attack?

   Hint

   Think about its effect on concrete.

2. 2.

   Name a common source of sulphate.

   Hint

   Consider materials found in the ground.

3. 3.

   What is the primary chemical cause of sulphate attack?

   • Hydrated cement compounds
   • Lime
   • Carbon dioxide

   Hint

   Consider what substances in concrete are affected.

4. 4.

   True or False: Internal sulphate attack results from external sources.

   • True
   • False

   Hint

   Think about definitions of internal versus external.

5. 5.

   Explain the chemical process of sulphate attack and its effects on concrete structure in detail.

   Hint

   Focus on the formation and behavior of expansive products.

6. 6.

   Design a preventive strategy for a building project located in a known sulphate-rich area. Discuss the materials and their benefits.

   Hint

   Consider both materials and construction practices.