Which of the following methods of transportation of concrete is useful for transporting the concrete to a relatively greater distance from batching plant?
- APump and pipe line
- BCrane and bucket method
- CTransit mixerCorrect
- DWheel barrow
Solution
Concept
A transit mixer keeps concrete moving in a rotating drum, so it can carry concrete over long distances without segregation or early setting.
Step-by-step solution
1. Check the distance each method can cover. 2. Wheel barrow: very short distance, inside the site. 3. Crane and bucket: mainly vertical lift and short horizontal distance. 4. Pump and pipe line: limited length of pipe, used inside the site. 5. Transit mixer: a truck with a rotating drum that carries concrete by road from the batching plant to far sites. 6. So the answer is (C).
Explanation
A transit mixer is a truck with a slowly rotating drum. The drum keeps mixing the concrete, so there is no segregation and the concrete stays workable on the way. So it is used to carry ready mixed concrete to far sites from the batching plant.
Why the other options are wrong
A: Pumping is limited to a pipe length within the site. B: Crane and bucket is for lifting at the site, not for long road travel. D: Wheel barrow is only for small quantities over very short distances.
Shortcut
Long distance from the batching plant (RMC) = transit mixer truck.
Common mistake
Choosing pump, but a pump only moves concrete within the site. It does not carry concrete from a far plant.
Correct answer: C) Transit mixer