Free CPO Concrete Mixture Handling & Pumping CPO Techniques Questions and Answers

Question 1

What is the ideal consistency for a concrete mix used in pumping?

Accepted Answer

Workable and cohesive with medium slump.

Answer

Dry and crumbly.

Answer

Extremely wet.

Answer

Stiff with large aggregates.

Question 2

What material can be added to concrete to improve pumpability?

Accepted Answer

Plasticizer or water-reducer.

Answer

Silica sand.

Answer

Crushed stone.

Answer

Air-entraining agent.

Question 3

Why is it important to maintain continuous flow during pumping?

Accepted Answer

To avoid blockages and pressure issues.

Answer

It saves fuel.

Answer

It cools the pump.

Answer

It speeds up drying time.

Question 4

What causes segregation in pumped concrete?

Accepted Answer

Incorrect mix proportions or vibration.

Answer

Using cold water.

Answer

Adding too much cement.

Answer

Pumping too slowly.

Question 5

What is the purpose of priming the pump before concrete delivery?

Accepted Answer

To coat the pipes and reduce friction.

Answer

To cool the equipment.

Answer

To clean the mixer.

Answer

To test the slump.

Question 6

What happens if aggregates are too large for the pump system?

Accepted Answer

They cause blockages and damage.

Answer

They improve pump performance.

Answer

They increase slump.

Answer

They speed up setting.

Question 7

Which method helps in maintaining uniformity of concrete mix during pumping?

Accepted Answer

Using hopper agitators.

Answer

Adding more water.

Answer

Reducing cement.

Answer

Speeding up pump rate.

Question 8

How does pumping distance affect concrete mix design?

Accepted Answer

More fluid mix is needed for long distances.

Answer

Less water should be used.

Answer

Pump speed must increase.

Answer

Use larger aggregates.

Question 9

What component in the mix helps reduce pipe wear?

Accepted Answer

Fly ash or fine sand.

Answer

Water.

Answer

Coarse gravel.

Answer

Retarders.