Ultimate strength to cement is provided by

Civil Engineering : Building Materials - Quiz(MCQ)

Tri-calcium aluminate

Di-calcium silicate

Tricalcium silicate

Tetra calcium alumino ferrite.

Correct Answer : Di-calcium silicate

Explanation : Di-calcium Silicate (C2S) : This compound will undergo reaction slowly. It is responsible for the ultimate strength of concrete. This is also called as Belite. The heat of hydration is 260 J/Cal. Its proportion is 25 - 40%.

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The proportions of charcoal, saltpetre and sulphur in gun powder by weight, are respectively :

75, 10, 15

10, 15, 75

15, 75, 10

10, 75, 15.

Correct Answer : Option (C) : 15, 75, 10

A 1st class brick immersed in water for 24 hours, should not absorb water (by weight) more than ____

10%

15%

20%

25%

Correct Answer : Option (C) : 20%

According to IS 399-1963, the weight of the timber is specified at ______

12% moisture content

14% moisture content

8% moisture content

10% moisture content

Correct Answer : Option (A) : 12% moisture content

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