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Q: Presence of oil in water for concrete :
  • A. Gives smooth surface
  • B. Gives more slumps
  • C. Improves strength
  • D. Reduces strength
Correct Answer: Option D - Mineral oil up to 2% by weight of cement significant decreases in strength. Vegetable and animal oils have bad effect on strength of concrete at later stages.
D. Mineral oil up to 2% by weight of cement significant decreases in strength. Vegetable and animal oils have bad effect on strength of concrete at later stages.

Explanations:

Mineral oil up to 2% by weight of cement significant decreases in strength. Vegetable and animal oils have bad effect on strength of concrete at later stages.