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Q: A very small amount of ______ is useful in making sound cement. If it is in excess, it causes the cement to become unsound.
  • A. iron oxide
  • B. sulphur
  • C. silica
  • D. alkali
Correct Answer: Option B - A very small amount of sulphur is useful in making sound cement, if it is in excess. It cause the cement to become unsound. Soundness test is two method – (i) Le-Chatelier method–measure unsoundness (free lime only) in mm. (ii) Auto clave test–Sensitive to both lime and magnesia. (in %)
B. A very small amount of sulphur is useful in making sound cement, if it is in excess. It cause the cement to become unsound. Soundness test is two method – (i) Le-Chatelier method–measure unsoundness (free lime only) in mm. (ii) Auto clave test–Sensitive to both lime and magnesia. (in %)

Explanations:

A very small amount of sulphur is useful in making sound cement, if it is in excess. It cause the cement to become unsound. Soundness test is two method – (i) Le-Chatelier method–measure unsoundness (free lime only) in mm. (ii) Auto clave test–Sensitive to both lime and magnesia. (in %)