Ready mix plant and central mix plant primarily differ in:
Correct Answer: A. Transportation
📚 Detailed Explanation: RMC vs. Central Mix Plant — Transportation Difference
Why A (Transportation) is correct: The two plant types have the same end product (concrete) but differ fundamentally in where and when mixing is completed. In RMC, mixing occurs during transportation. In a Central Mix Plant, mixing is complete before transportation begins.
RMC Plant vs. Central Mix Plant Compared
| Feature | Ready Mix Concrete (RMC) Plant | Central Mix Plant |
|---|---|---|
| Batching location | Central plant | Central plant |
| Mixing location | In transit mixer drum during transport | At plant (in stationary drum/pan mixer); complete before dispatch |
| Water addition | Can be added at plant or in transit mixer | All water added at plant; fully wet mix dispatched |
| Transport vehicle | Transit mixer (drum agitates at 2–4 rpm) | Open dump truck, agitator truck |
| Mix quality on arrival | Freshly mixed during transport; very consistent | Fully mixed at plant; may stiffen slightly in transit |
| Key difference | TRANSPORTATION: RMC mixes in transit; central mix completes mixing at the plant | |
- RMC and Central Mix differ in transportation — how/when mixing is completed.
- Both produce concrete of equivalent quality; RMC gives more flexibility for longer hauls.
- Central mix can use open dump trucks (cheaper) since concrete is already mixed.