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Q: The type of cement used in lining of deep tube wells is :
  • A. Blast furnace slag cement
  • B. Portland pozzolana cement
  • C. Oil well cement
  • D. High alumina cement
Correct Answer: Option B - • Portland pozzolana cement is used in lining of deep tube wells. It is prepared by grinding pozzolanic clinker with Portland cement. This cement has high resistance to various chemical attacks on concrete compared with ordinary Portland cement and thus it is widely used. It is used in marine structure, sewage works, piers, dams and mass concrete works etc. • Oil-well cements are used for cementing work in the drilling of oil wells where they are subject to high temperature and pressures.
B. • Portland pozzolana cement is used in lining of deep tube wells. It is prepared by grinding pozzolanic clinker with Portland cement. This cement has high resistance to various chemical attacks on concrete compared with ordinary Portland cement and thus it is widely used. It is used in marine structure, sewage works, piers, dams and mass concrete works etc. • Oil-well cements are used for cementing work in the drilling of oil wells where they are subject to high temperature and pressures.

Explanations:

• Portland pozzolana cement is used in lining of deep tube wells. It is prepared by grinding pozzolanic clinker with Portland cement. This cement has high resistance to various chemical attacks on concrete compared with ordinary Portland cement and thus it is widely used. It is used in marine structure, sewage works, piers, dams and mass concrete works etc. • Oil-well cements are used for cementing work in the drilling of oil wells where they are subject to high temperature and pressures.