3.1. Mix Design Considerations

Try these first

1. 1.

   What is the purpose of lubrication in concrete pumping?

   Hint

   Think about how lubrication helps in machinery.

2. 2.

   Why should the concrete pump be cleaned immediately after use?

   Hint

   Consider the time-sensitive nature of concrete.

3. 3.

   Why is lubrication necessary before pumping concrete?

   • To enhance strength
   • To improve flow
   • To lower cost

   Hint

   Think about the physical properties of lubrication.

4. 4.

   True or False: The slump for pumpable concrete should be less than 50 mm.

   • True
   • False

   Hint

   Consider the ideal range for flowability in concrete.

5. 5.

   A construction site needs a steady supply of concrete for a block of apartments. They will be using lightweight aggregates. What should the team consider to ensure that the concrete is effectively pumped without losing workability?

   Hint

   Consider how the characteristics of materials affect flowability.

6. 6.

   During a concrete pouring event, the pump got clogged due to large aggregates. What measures could have been implemented initially to prevent this situation?

   Hint

   Think about the processes that ensure a smooth concrete mix.