13.2. Requirements for Pumpable Concrete

Try these first

1. 1.

   What is meant by the term 'cohesiveness' in concrete?

   Hint

   Think about what keeps everything sticky.

2. 2.

   Why is the mortar fraction important for pumpable concrete?

   Hint

   It's like a lubricant for a machine.

3. 3.

   Which of the following is a key requirement for pumpable concrete?

   • High water-cement ratio
   • Well-graded aggregates
   • Large aggregate size

   Hint

   Think about how particles fit together.

4. 4.

   True or False: Cohesiveness in concrete helps prevent segregation during pumping.

   • True
   • False

   Hint

   Consider the definition of cohesiveness.

5. 5.

   You are in charge of a large construction project requiring pumpable concrete. The aggregates delivered to your site are not well-graded. Explain the potential issues this may create during pumping and provide mitigation strategies.

   Hint

   How can mixing improve flow?

6. 6.

   Design a concrete mix for a specific project where long-distance pumping is necessary. Detail at least three enhancements you would include to ensure the mix is highly pumpable.

   Hint

   Think about strategies to reduce friction and blockages.