Answer: D. All the above
The risk of segregation is more for all the given options.
The separation of the components that make up concrete during handling and placement is referred to as segregation.
Causes of segregation -
- Dropping of concrete from height.
- A wetter mixture where the cement paste separates from the aggregate occurs as a result of a higher water-cement ratio.
- 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 risk of segregation is more for a wetter mix, larger proportion of maximum size aggregate and coarser grading. So option D is correct.
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