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Q: For construction of structures in sea water, the cement generally preferred to is
  • A. Portland-pozzolana cement
  • B. quick setting cement
  • C. low heat portland cement
  • D. None of these
Correct Answer: Option A - Portland – pozzolana cement is composed of 10–15% puzzolanic materials. Puzzolanic materials are essentially siliceous or aluminums compound which is itself do not posses any cementous property but when it reacts with Ca(OH)₂, released during hydration of cement, leads to formation of cementous compound. It is used in the construction of structure near sea sites because it has high water tightness, low heat of hydration & high resistance against Cl₂ & SO₄ (which are found in abundance in sea).
A. Portland – pozzolana cement is composed of 10–15% puzzolanic materials. Puzzolanic materials are essentially siliceous or aluminums compound which is itself do not posses any cementous property but when it reacts with Ca(OH)₂, released during hydration of cement, leads to formation of cementous compound. It is used in the construction of structure near sea sites because it has high water tightness, low heat of hydration & high resistance against Cl₂ & SO₄ (which are found in abundance in sea).

Explanations:

Portland – pozzolana cement is composed of 10–15% puzzolanic materials. Puzzolanic materials are essentially siliceous or aluminums compound which is itself do not posses any cementous property but when it reacts with Ca(OH)₂, released during hydration of cement, leads to formation of cementous compound. It is used in the construction of structure near sea sites because it has high water tightness, low heat of hydration & high resistance against Cl₂ & SO₄ (which are found in abundance in sea).