Segregation is responsible for ...........
Try it first: pick an option, then read the explanation.
Effects of Segregation in Concrete
Segregation is the separation of concrete ingredients (coarse aggregate sinking, water/cement paste rising). This causes three distinct defects, all listed in the question:
A — Honeycombing: coarse aggregate clusters without sufficient paste, leaving voids visible on the surface.
B — Porous layers: areas where excess water and fines float up, creating a weak, permeable layer (especially at the top of each lift).
C — Sand streaks: fine material carried along formwork faces by bleed water, leaving pale streaks on the surface.
Key takeaway
Segregation → honeycombing + porous layers + sand streaks. All weaken the concrete and reduce durability. Prevent it with correct w/c, good compaction, and limiting drop height.