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Question
Oleic acid may be used in the manufacture of:
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A.
White cement
B.
Hydrophobic cement
C.
Anti-bacterial cement
D.
Portland pozzolana cement
Answer ( Option B)

Hydrophobic cement

Solution

• Oleic acid is used in the manufacture of hydrophobic cement.
• Hydrophobic cement is obtained by grinding OPC clinker with water repellant film forming substance such as oleic acid and stearic acid.
• This film reduces the rate of deterioration of the cement during long storage, transport or under unfavourable conditions.
Note :
1. Portland Pozzolana Cement (PPC)
• It is manufacutared by grinding OPC and Pozzolana (usually flyash 10 to 25% by mass).
• Pozzolana has no cementing properties itself but has the property of combining with lime to produce a stable lime-pozzolana compound which has definite cementious properties.
• Free lime is thus removed and hence resistance to chemical attack increases making it suitable for marine works. Low rate of development of strength but ultimate strength is comparable with OPC.
• It is used in mass concreting and places of high temperature
2. White cement: It is similar to ordinary, gray portland cement in all aspects except for its high degree of whiteness. White colour makes it special from architectural point of view and is used in making sculpture and to decorate building.
3. Anti-bacterial cement: It has an extra antibaterial agent from OPC and used in tile production, forming construction material and it have resistance against mold, fungus and bacteria.

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