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Q: If too much water is added to concrete, the excess water along with the cement comes to the surface and this cement water mixture form a thin layer of chalky material, known as
  • A. Bleeding
  • B. Laitance
  • C. Surface tension
  • D. Segregation
Correct Answer: Option B - Laitance defined as cement and water slurry form of a thin layer of chalky material coming on top and setting on the surface is very dangerous since the top surface will weather out fast with larger shrinkage cracks. If laitance is formed in a lift, it should be removed before next lift is placed. It occurs if too much water is added to concrete.
B. Laitance defined as cement and water slurry form of a thin layer of chalky material coming on top and setting on the surface is very dangerous since the top surface will weather out fast with larger shrinkage cracks. If laitance is formed in a lift, it should be removed before next lift is placed. It occurs if too much water is added to concrete.

Explanations:

Laitance defined as cement and water slurry form of a thin layer of chalky material coming on top and setting on the surface is very dangerous since the top surface will weather out fast with larger shrinkage cracks. If laitance is formed in a lift, it should be removed before next lift is placed. It occurs if too much water is added to concrete.