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Q: What is the main reason to use lime in the cement slurry during the plastering in the top coat?
  • A. To make the surface bright
  • B. To harden the cement
  • C. To make the plaster non-shrinkable
  • D. To improve the workability of plaster
Correct Answer: Option C - Lime is not a necessary mortar ingredient but during the plastering in the top coat the hydrated lime is used in the cement slurry because replacing 10 to 15% of total volume of cement with hydrated lime usually produces optimum results. When it is added sand & cement do not separate. The final mortar also is more waterproof and shrinkage cracking often can be eliminated.
C. Lime is not a necessary mortar ingredient but during the plastering in the top coat the hydrated lime is used in the cement slurry because replacing 10 to 15% of total volume of cement with hydrated lime usually produces optimum results. When it is added sand & cement do not separate. The final mortar also is more waterproof and shrinkage cracking often can be eliminated.

Explanations:

Lime is not a necessary mortar ingredient but during the plastering in the top coat the hydrated lime is used in the cement slurry because replacing 10 to 15% of total volume of cement with hydrated lime usually produces optimum results. When it is added sand & cement do not separate. The final mortar also is more waterproof and shrinkage cracking often can be eliminated.