20.1. Issue: Slump too low

Try these first

1. 1.

   What does a slump test measure?

   Hint

   Think about what is meant by 'workability'.

2. 2.

   Name one cause of low slump.

   Hint

   Consider what could make a mix stiff.

3. 3.

   What is the primary measure of a slump test?

   • Density
   • Workability
   • Temperature

   Hint

   Think about what workability means in concrete.

4. 4.

   True or False: Low slump indicates better workability.

   • True
   • False

   Hint

   Consider the flow of the concrete.

5. 5.

   A construction site receives a batch of concrete with a measured slump of 20 mm when a slump of 75-100 mm is expected. Discuss the potential consequences on workability and structural integrity.

   Hint

   Consider how proper compaction affects strength.

6. 6.

   Given that excessive fines lead to low slump, propose a strategy to ensure proper grading of aggregates in mix design.

   Hint

   Refer to aggregate grading tables in the IS codes for guidance.