Fresh concrete defects — name the separation of water from the mix What is the term for the tendency of freshly placed concrete to expel water that rises to the surface, sometimes carrying fine cement/sand with it?

Introduction / Context:
Fresh concrete may exhibit undesirable phenomena if mix proportions or placing/compaction are not optimal. Identifying these defects helps adjust the mix and workmanship to achieve dense, durable concrete.

Given Data / Assumptions:

• Plastic concrete immediately after placing and compaction.
• Normal aggregates and Portland-cement binder.
• Observation of water rising to the surface.

Concept / Approach:
Bleeding is the movement of mix water to the top surface as solids settle. It can leave a weak laitance layer and increase plastic shrinkage cracking risk. Segregation is the separation of coarse aggregate from the mortar; it is different from bleeding. Creeping relates to long-term deformation under sustained load, not a fresh concrete issue. “Flooding” is not a standard term in concrete technology for this phenomenon.

Step-by-Step Solution:

Verification / Alternative check:
ASTM/IS terminology defines bleeding as separation and upward migration of water in freshly placed concrete.

Why Other Options Are Wrong:

• Segregation: different mechanism (particle separation).
• Creeping: occurs in hardened concrete.
• Flooding/None: not the technical term for the described effect.

Common Pitfalls:
Over-sanding or high w/c ratio exacerbates bleeding; inadequate finishing and early trowelling over bleed water weakens the surface.

Final Answer:
Bleeding