9.2. Exposure Classifications (as per IS 456:2000)

Try these first

1. 1.

   What is the maximum water-cement ratio for mild exposure?

   Hint

   Look in the mild exposure section.

2. 2.

   How much cement is required for moderate exposure?

   Hint

   Moderate exposure also has a requirement for cement content.

3. 3.

   What is the minimum cement content required for very severe exposure?

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

   Hint

   Think about the increasing severity of exposure.

4. 4.

   True or False: The w/c ratio for extreme exposure is higher than that for severe exposure.

   • True
   • False

   Hint

   Understand how the ratio corresponds to exposure types.

5. 5.

   A contractor is planning a bridge in a coastal city intending to use very severe exposure classification. Determine the minimum cement content and water-cement ratio needed for durability.

   Hint

   Check the requirements outlined for very severe exposure in IS 456:2000.

6. 6.

   If a concrete mix fails to meet the required cement content for an extreme exposure environment, what potential issues might arise? Discuss the consequences based on the conditions specified.

   Hint

   Consider how aggressive environments interact with weaker mixes.