The impurity of mixing water which affects the setting time and strength of concrete, is______.

A)
calcium chorides
B)
sodium sulphates
C)
calcium bicarbonates
D)
sodium carbonates and bicarbonates

Correct Answer :   sodium carbonates and bicarbonates

Recently Updated in Concrete Technology Questions
Which of the following compound is used for fine polishing?
A)
Nitric oxide
B)
Iron oxide
C)
Silicon carbide
D)
Aluminum oxide

Correct Answer : Option (D) :   Aluminum oxide

Explanation : Powder form of aluminum oxide is used for fine polishing process. It is surface treatment process.

Maximum nominal size of aggregates to be used in concrete may be as large as possible within the limits prescribed by __________
A)
IS 456-2010
B)
IS 456-2000
C)
IS 465-2000
D)
IS 513-1999

Correct Answer : Option (B) :   IS 456-2000

Explanation : Option can be eliminated because there is no such code. Maximum nominal size of aggregates to be used in concrete may be as large as possible within the limits prescribed by IS 456:2000.

Air contents should be _________ % by volume.
A)
1-2
B)
2-3
C)
3-4
D)
4-5

Correct Answer : Option (C) :   3-4

Explanation : This type of cement was first of all developed in U.S.A. It is recommended that air contents should be 03-04 % by volume.

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