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Civil Engineering - Concrete Technology - Discussion

Discussion Forum : Concrete Technology - Section 2 (Q.No. 20)
Concrete Technology
20.
For construction of structures in sea water, the cement generally preferred to, is
Portland-pozzolana cement
quick setting cement
low heat Portland cement
rapid hardening cement
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
Discussion:
32 comments Page 1 of 4.
Rahul dhore said:   1 decade ago
High alumina cement are used in sea water.
Prakash keskar said:   1 decade ago
Why high alumina cement used in sea water?
Basu said:   1 decade ago
Alumina has better resistance against salt content water and it increase heat of hydration.
Prashant Bhardwaj said:   10 years ago
Low heat cement is used, option C.
Jeetendra singh said:   10 years ago
Yes PPC are used in sea water but given option high alumina cement. So high alumina cement.
Adil hussain said:   9 years ago
There is more sulphates presence in sea water and PPC is a good sulphate resisting cement. So A option is correct.
Suman Ramachandran said:   9 years ago
High alumina cement use sea waters.
Shubham said:   9 years ago
Rapid hardning cement is used as sudden hardening is important for such structures.
Vicky6 said:   9 years ago
Why there is no use of quick-setting cement in sea structures?
Ankit kumar said:   9 years ago
IS:1489(part-I ) -1991 (using flyash).

It gives low heat of hydration and reduces the leaching of calcium hydroxide. This cement should be used only after proper evaluation. This should be tested as per IS:1489 (Pt I) " 1991. It is used for:

- Hydraulic structures-dams, retaining walls.
- Marine structures.
- Mass concrete works- like bridge footings.
- Under aggressive conditions.
- Masonry mortar and plastering.
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