6.1. Exposure Classifications (As per IS 456:2000)

Try these first

1. 1.

   What type of exposure corresponds to protected indoor conditions?

   Hint

   Think about areas that are shielded from the outside environment.

2. 2.

   What is the maximum water-cement ratio for M25 grade concrete?

   Hint

   Consider the context of moderate exposure.

3. 3.

   What is the minimum cement content for M30 grade concrete?

   • 300 kg/m³
   • 320 kg/m³
   • 340 kg/m³

   Hint

   Focus on the requirements for Severe Exposure.

4. 4.

   True or False: Moderate exposure requires M20 grade concrete.

   • True
   • False

   Hint

   Reflect on the grade associated with Moderate Exposure.

5. 5.

   A coastal city plans to construct a marina. Explain the process of selecting the right concrete grade and mix based on exposure classifications.

   Hint

   Refer back to the very severe and extreme categories for the right concrete grade.

6. 6.

   Analyze how improper exposure classification could lead to structural failures in concrete used in industrial environments.

   Hint

   Consider how different exposures assume different levels of risk.