Answer: D. All the above
The chances of segregation are more for wetter mix, a larger proportion of maximum size aggregate, and coarser grading.
Segregation is defined as the separation of the constituent materials of concrete during the handling and placing of concrete. The causes of segregation are given below.
- Dropping of concrete from height.
- Higher water-cement ratio results in a wetter mix in which the cement paste separates out from the aggregate.
- Vibrating the concrete for a longer duration.
- Badly proportioned mixed having large proportions of maximum size aggregate or coarse grading can result in aggregate settling out of the cement paste.
According to the given options, the chances of segregation are more for a wetter mix, larger proportion of maximum size aggregate and coarser grading. So, option D is correct.
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